5. Owc403700 Bsc6900 Wcdma v900r014 Troubleshooting Issue 1.

8/10/2019 5. Owc403700 Bsc6900 Wcdma v900r014 Troubleshooting Issue 1.

1/179

BSC6900 WCDMA V900R014 Troubleshooting

Confidential Information of Huawei. No Spreading Without Permission


2/179




3/179




4/179




5/179




6/179




7/1797




8/1798




9/179




10/179




11/179




12/179




13/179


14/179




15/179




16/179

Local end loopback, which means that data goes through a loop within a NodeB (or

RNC) instead of through E1 cables. It is used to check whether the transmission chipsare normal.

After we execute the SET E1T1LOP as REMOTE mode on A side, we can execute DSPE1T1 on B side to query E1 state, if the state is normal, that means the physicaltransmission from A to B is normal, otherwise, it means the transmission is faulty.




17/179

Use STP E1T1ONLTST to stop the E1/T1 online BER test and report the test data to the

LMT. RNC dont support online BER test.




18/179

Run STP E1T1OFFLTSTto stop the offline test. When the test is stopped, the final

statistics result is reported. Configure the E1 remote loopback on the local end, and then start the E1 offline

performance test on the remote end. Or configure the E1 physical loopback on thelocal end, and then start the E1 offline test on the local end. The test time is one tosixty minutes.

Online BER test does not affect services,

Offline BER test affect services, but the result is more accurate than that of the onlinetest.




19/179

To conduct the BER test, perform the following steps:

1) Use the STR E1T1TST command to start the BER test.2) Use the DSP E1T1TST command to query the test result.3) Use the STP E1T1TST command to stop the test.

Configure the E1 remote loopback on the local end, and then start the E1 offlineperformance test on the remote end. Or configure the E1 physical loopback on thelocal end, and then start the E1 offline test on the local end. The test time is one tosixty minutes.




20/179

Once the function is activated, the continuous check on the VCL persists until it is

deactivated. This function operates at the ATM F5 layer through OAM cells. Therefore,the ongoing service will not be affected.

You can run this command to activate the continuous check on VCL, and then runDSP VCLCCto query the operation result, and finally run DEA VCLCCto deactivatethe continuous check on VCL.

This command is applicable to the AEUa, AOUa, AOUc, UOIa(ATM) and UOIc boards.

The continuous check function applies only to the VCL that bears the SAAL link, IPoAPVC, or AAL2 path.

The continuous check can be activated on the SAAL link only when the upper-layerapplication bearer such as NCP/CCP/ADJNODE/MTP3LNK is configured.

The continuous check operation succeeds only when the continuous check is alsoactivated on the peer VCL.The operation on the NodeB side is activated passively.Otherwise, the system regards the VCL to be faulty, and the VCL CC Activation Failurealarm is generated.

Either CC or LOOBACK can be activated on each VCL at a time.




21/179

The VCL should have been configured before the command was executed. Only the

VCL that bears the SAAL link, IPoA link and AAL2 path can support CC state query. Even if the CC function of the VCL is not activated the CC state still can be queried,

because the CC function can be activated passively, that is, it can be activated by othernetwork nodes.

If the CC type is LOOPBACK, the query result will show loopback delay information.




22/179


23/179

Use this command to query the result of the performance monitoring (PM) of the

virtual channel link (VCL). The query result includes the activation status of the PMfunction, statistics of the cell loss, statistics of the cell misinsertion and application ofthe VCL.

You cannot obtain the VCL statistics if the VCL to be queried is in deactivated state.

The VCL whose PM status to be queried must be already configured. Only the PMstatus of the VCL that carries the SAAL link, IPoA PVC and AAL2 path can be queried.

The PM function can be activated passively, that is, it can be activated by othernetwork nodes. Therefore, even if the PM function for the VCL is not activated, thePM status can still be queried.




24/179

The working status measurement result of the AAL terminal corresponding to a

specified VCC can be obtained by AAL VCC performance measurement. The resultinformation includes: number of bytes correctly received/transmitted, number ofpackets correctly received/transmitted, number of cells correctly received/transmitted,number of error bytes received/transmitted.

NodeB dont support this function.




25/179

Use this command to query the performance measurement result of a specified AAL

VCC. This command is applicable to the AEUa,AOUa,AOUc,UOIa(ATM or IP) and UOIcboards.

Query the AAL performance measurement of the VCL terminal corresponding to aspecified VCC. The working status measurement result of the AAL terminalcorresponding to a specified VCC can be obtained by AAL VCC performancemeasurement. The result information includes: number of bytes correctlyreceived/transmitted, number of packets correctly received/transmitted, number ofcells correctly received/transmitted, number of error bytes received/transmitted.




26/179

Use this command to ping a destination IP address from a specified source IP address

of a board to check the connectivity of the IP layer between the local end and the peerend.

This command is applicable to the PEUa, AEUa, AOUa, AOUc, UOIa(ATM or IP), FG2a,GOUa, POUa, UOIc, FG2d, FG2c, GOUd, GOUc and POUc boards.

The source IP address must be the local IP address of the PPP link of thePEUa/POUa/UOIa(IP)/POUc board, the local IP address of the MP group of thePEUa/POUa/POUc board, the IP address of the Ethernet port of theFG2a/GOUa/FG2d/FG2c/GOUd/GOUc board, the IP address of the Trunk group of theFG2a/GOUa/FG2d/FG2c/GOUd/GOUc board, the local IP address of the IPoA PVC ofthe AOUa/AOUc/AEUa/UOIa (ATM)/UOIc (ATM) or the device IP address of the board.

After configure the IPoA link used as an OM channel when ATM transmission isadopted, Ping is used to check the OoS of ATM transmission.




27/179

This function is used to monitor the time difference between RNC Frame Number

(RFN) and NodeB Frame Number (BFN) of the specified cell and the time taken fornode synchronization. By performing this task, you can observe the float between theRFN and BFN and transfer delay in real time. If the difference between RFN and BFNvaries too rapidly, you can infer that there are some problems on the transmissionbetween the BSC6900 and the NodeB.




28/179




29/179


30/179

This command can obtain the statistic of the parameters, such as Link Availability

Status, Number of received Unicast frame, Rx correct bytes, Tx correct bytes and soon.




31/179




32/179

PING principle

PING works in this procedure: The system sends a PING request to thedestination. If the connection to the destination network is good, the hostcomputer of the destination responses to the source host computer uponreceiving the PING request.

If the network is found faulty through PING, you can use TRACERT to locatethe fault.

The output of PING is the PING response from the destination. If no responseis received within the limit, the output is "Request time out". Otherwise itoutputs the message size in bytes, message number, TTL, and response time.The final statistics include the number of sent messages, number of received

messages, percentage of the non-response messages, and the minimum,maximum and average response time.




33/179

If the result is Request time out, it means transmission is disconnected.

If Request time out exist with probabilities, it means packets loss exist. If the value of time is big, it means transfer delay is high.

If the difference between the value of time is large, it means vibration exist.




34/179

Trace Principle

The process for running is as follows: The source computer sends a datapacket with the TTL as 1. The first hop responds with an ICMP error messageindicating that the packet is not sent due to TTL timeout. The data packet issent with the TTL as 2, and then likewise the second hop responses TTLtimeout. The process is carried on until the data packet reaches thedestination. The purpose of these procedures is to record every originaladdress of the ICMP TTL timeout message. These addresses form the route forsending an IP packet to the destination.

If the network is found faulty through PING, you can use TRACERT to locatethe fault.

If the route address in the response is 0.0.0.0, it means that the test passedthrough a route over board.

The output of TRACERT includes the IP addresses of all the gateways that thedata packet has gone through from the source to the destination, and theresponse duration for each gateway. If the response time expires, it outputs astar sign "*".




35/179

If network is normal, every next hop is display.

If network is abnormal, destination ip is not reachable, and stop at the faulty segment.




36/179

Princilpe

RNC sends ICMP or UDP packets to the destination continuously through theIPPATH that activate the function of IPPATH ping. If the IPPATH to thedestination network is normal, the destination send responses to the RNC. Andthe RNC will receive returning packets.

Result Analysis of IPPATH testing

If the RNC cant receive returning packets, it mean the IPPATH is abnormal,and will reportPath Faultalarm.




37/179

Principle

After the IP loopback test is started, the DSP sends loopback packets to theNodeB in a specified period and then the NodeB returns the loopback packetsto the DSP

You can determine the connectivity and link quality according to the receivedloopback packets

NodeB support IP loopback operation, but dont support IP loopback test.

RNC support IP loopback test only.




38/179




39/179

Use this command to set remote loop of IP level.

The command can be executed only when the transmission board is in normaloperation.

The loop back mode can be overwritten.

The command only take effect with the IP packets of the UDP protocol.

This command can not be executed with IP tracing at the same time.

Some services may be interrupted.

After starting the remote loop of IP level on NodeB, IP Remote Loopback would bereported.




40/179

Use this command to display the remote loop mode of IP level.




41/179

Use this command to start the IP loopback test. The function is to check the

connectivity between DSP and the interface boards or the peer equipments.Thiscommand is applicable to the FG2a, GOUa, FG2c and GOUc boards.

Note

Only one IP loopback test can be started for one DSP.

This command is used to start the IP loopback test on the Iub or Abis interface.When the parameter LOPTis set as REMOTE_LOOP, you need to enable the IPremote loopback function by setting IP address and port number on theNodeB. Otherwise, the function is unavailable.

The quaternary group information (Local IP address, Peer IP address, SrcPort NO., and Dst Port NO.) set in each IP loopback detection cannot be thesame.




42/179

Use this command to query the result of the loopback test at the IP layer.

The IP loopback test should be enabled on the DSP to be queried.




43/179




44/179


45/179


46/179

Use this command to query IPPM State. This command is applicable to the FG2a,

GOUa, FG2c and GOUc boards.




47/179


48/179




49/179




50/179

E1/T1 is a shortened form of the two different systems PCM30 and PCM24 in digital

system. The transmission rate of E1 link is 2,048 kbit/s, and that of T1 link is 1,544kbit/s.

The type of E1link can be E1_DOUBLE_FRAME or E1_CRC4_MULTI_FRAME

E1_DOUBLE_FRAME represents the link with dual-frame structure.

E1_CRC4_MULTI_FRAME indicates the link with multi-frame structure. TheE1_CRC4_MULTI_FRAME format is usually applied. Links ofE1_CRC4_MULTI_FRAME type can perform error checking, which may greatlyreduce the error rate of synchronous frame extraction.

The type of T1link can be T1_EXTENDED_SUPER_FRAME or T1_SUPER_FRAME type

T1_SUPER_FRAME represents super frame. T1_EXTENDED_SUPER_FRAME indicates extended super frame. Usually, the

T1_EXTENDED_SUPER_FRAME format is applied. Links ofT1_EXTENDED_SUPER_FRAME type can also perform error checking.

The coding types of E1link are HDB3 and AMI

HDB3 is usually applied. HDB3 represents high-density bipolar code. It is noteasy to be interfered, and the transmission distance is about several kilometers.

The coding types of T1link are B8ZS and AMI.

B8ZS is usually used. It helps prevent clock signals from being lost, but AMI

cannot perform such function.




51/179


52/179




53/179




54/179

RNC MML: DSP E1T1

Use this command to query one or multiple E1/T1 ports for the working stateand attributes, including port running state, port type, TX frame format,expected RX frame format, TX line coding mode, RX line coding mode,loopback type, highway data rate on the BSC6900 side, line impedance,communication distance, clock mode, code violation count, framing errorcount, CRC error count, E-bit error count, Sa6 error count, multiframe periodsin asynchronous state, changes of frame or multiframe alignment, whether toenable scrambling, connected node information, whether the E1/T1 port isused and site name.

NodeB MML:DSP E1T1

Use this command to display E1/T1 port status, E1/T1Work Mode, Clock Mode,Line Code, Frame Format, Loopback Mode, Line Impedance.




55/179

Loop back mode:

NOLOOP (loopback mode is cancelled.) REMOTE (Remote loopback, which means that data goes through a loop of E1 cables

between NodeB and RNC. it is used to check whether the E1 cables are normal.)Default value: NOLOOP

LOCAL (Local end loopback, which means that data goes through a loop within aNodeB (or RNC) instead of through E1 cables. It is used to check whether thetransmission chips are normal.)

After we execute the SET E1T1LOP as REMOTE mode on A side, we can execute DSPE1T1 on B side to query E1 state, if the state is normal, that means the physicaltransmission from A to B is normal, otherwise, it means the transmission is faulty.




56/179

NodeB MML: STR E1T1ONLTST

Use this command to start the E1/T1 online performance test. A maximum of three users can start the online performance test simultaneously on each

port.

You cannot start an online performance test at the port where an offline performancetest is already started. Conversely, you cannot start an offline performance test at theport where an online performance test is already started.

You can start the online performance test on multiple ports on the same board.

If the online performance test encounters a turnover, the number of error bits after theturnover is reported.

An online performance test is applicable to a transmission link working properly andhaving error bits. You are advised to check the E1/T1 link status before starting an onlinetest. If the link is faulty, you are not advised to start an online performance test. In thiscase, you can start an E1/T1 offline performance test and rectify the E1/T1 link fault.

When Period Report Switch is set to ON, the test result within a second is reported everyother second. When Period Report Switch is set to OFF, you can run the STPE1T1ONLTST command to obtain the test result.

NodeB MML: STP E1T1ONLTST

Use this command to stop an E1/T1 online performance test and report the test data tothe LMT.

You cannot perform any operations on the E1/T1 online performance test started byanother user.

This command takes effect only when the test of the corresponding online performancedata has been started.




57/179

NodeB MML: STR E1T1OFFLTST

Use this command to start an E1/T1 offline BER test on the transmission board. An E1/T1 offline performance test is used to determine the BER of an E1/T1 link. Before

starting the test, set the E1/T1 port at the peer end to remote loopback or set the E1/T1port at the local end to local loopback or physical loopback. The test is invalid if noloopback is specified.

When the E1/T1 port at the peer end is set to remote loopback or physical loopback isimplemented at the local end, there is a possibility that the physical layer cannot detectthe existence of the physical loopback due to bit errors on the link. As a result, you mayrun the DSP E1T1 command to check whether the associated E1/T1 ports are in physicalloopback state. Note that the E1/T1 offline performance test can be started only whenphysical loopback is in effect implemented.

A loopback is specified for the E1/T1 offline performance test. This may disrupt services.

The E1/T1 high BER detection stops when an E1/T1 offline performance test is started.In this case, the status of the E1/T1 high BER errors is not updated.

When an E1/T1 offline performance test is started, a Pseudo-Random Binary Sequence(PRBS) is transmitted on the E1/T1 link. The PRBS is a type of test data that does nothave a frame format. Therefore, frame synchronization loss may occur on the E1/T1 link.

If Period Report Switch is set to ON, the test result is reported every other second. IfPeriod Report Switch is set to OFF, you can obtain the test result after the test durationexpires or after you run the STP E1T1OFFLTST command.

After the test duration expires, the total BER and total number of error bits within thetest duration are reported irrespective of whether Period Report Switch is set to ON.

Each time only one user can start the E1/T1 offline performance test on an E1/T1 port. Ifmultiple users start such tests on an E1/T1 port, a failure will be reported.




58/179

RNC MML: STR E1T1TST

Use this command to start an E1/T1 Bit Error Ratio (BER) test on the AEU, PEU, AOU,and POU. The BER test may interrupt the service carried on the port.

Before starting the BER test, configure the local loopback at the local end or configurethe remote loopback at the peer end or connect the TX end to the RX end by usingthe loopback connector.

The accuracy of testing results is limited because the test tool is not a specialized toolfor the BER test. Thus, the tool is used to test only the BER severity. To obtain accurateBER data, use a tool specialized for the BER test.

The loopback test and BER test cannot be performed simultaneously.

An E1/T1 port must be set to the loopback state before the BER test is started on theE1/T1 port or before the timeslot-level test is started on the E1/T1 port.

One BER test can be started for a board at a time.

To conduct the BER test, perform the following steps:1) Use the STR E1T1TST command to start the BER test.2) Use the DSP E1T1TST command to query the test result.3) Use the STP E1T1TST command to stop the test.After the BER test is stopped, the DSP E1T1TST command can still be used to querythe last test result.

RNC MML: STP E1T1TST

Use this command to stop an E1/T1 Bit Error Rate (BER) test.




59/179

Query first, Handling second

To Query the E1/T1 alarm and use DSP E1T1 to query the E1/T1 state first, ifthe abnormal state of E1/T1 have been found, handle the fault.

Loop back first, Test second

If the E1/T1 state is abnormal, just need use DSP E1T1 to query the state, noneed test BER of it. If the High BER alarm appeared, use online or offline testfunction.

Online test first, Offline test second

Because the Offline interrupt the running of link, so Online test is the firstchoice

Far first, Near second

Loop back distance should be long at first, if in the case, the link is abnormal,decrease the loopback distance and query link state again.




60/179


61/179




62/179


63/179

The SAAL faults are as follows: outgoing unidirectional communication, incoming

unidirectional communication, selective packet loss, no communication, and irregularpacket loss.




64/179

Run the LST SAALLNK command to check whether the configuration at both ends is

correct. Run the DSP SAALLNK command on the both end to display whether the upper layer

application (MTP3b or NCP/CCP) of the SAAL is configured.

Start the SAAL/MTP3b/SCCP tracing. Analyze the fault phenomenon and possiblecauses through the tracing.

The following sections describe the locating of four faults that frequently occur.




65/179

Enable the SAAL tracing on the RNC. (Trace -->UMTS Service -->Interface Trace --

>SAAL) In this scenario, the SAAL link on the RNC is not configured with the upper layer

application, however, the peer SAAL link is configured with the upper layerapplication.




66/179

In this scenario ,the possible causes:

The SAAL link on the NodeB is not configured with the upper layer application The unilateral communication




67/179

The cause may be that there are a large amount of packets lost, therefore, the other

end cannot receive the packets and then triggers the release.




68/179

DSP AALVCCPFM

Use this command to query the performance measurement result of a specified AALVCC. This command is applicable to the AEUa, AOUa, AOUc, UOIa(ATM or IP) andUOIc boards.

Query the AAL performance measurement of the VCL terminal corresponding to aspecified VCC. The working status measurement result of the AAL terminalcorresponding to a specified VCC can be obtained by AAL VCC performancemeasurement. The result information includes: number of bytes correctlyreceived/transmitted, number of packets correctly received/transmitted, number ofcells correctly received/transmitted, number of error bytes received/transmitted.




69/179




70/179




71/179

The AAL2PATH unavailable fault is usually result in the establishment failure of the

common channel in the cell, the establishment failure of the RRC connection, and theestablishment failure of the CS service. By nature, these faults are establishmentfailures of the QAAL2.




72/179


73/179

Check the AAL2 PATH state and bandwidth configuration

On the RNC, run the DSP AAL2PATHcommand through the LMT to querywhether the AAL2PATH is available, and whether the AAL2PATH is blocked bythe local end or peer end. If the AAL2PATH is blocked by the local end or peer

end, you must unblock the AAL2PATH.

Check whether the remaining bandwidth and CID of the AAL2PATH aresufficient. If the remaining bandwidth or CID is insufficient, the AAL2 accessfails.

Check whether the physical link of the AAL2PATH and the PVC are normal

Check whether the physical link of the AAL2PATH generates the relevantalarm. If the alarm is generated, you must process the alarm firstly.

If the data configuration and physical link are normal, you must check whetherthe PVC layer is normal.

If both ends of the connection support the CC check, you can enable the CCcheck of the PVC corresponding to the AAL2PATH. On the NodeB, the CCcheck is enabled by default.

If the CC check is not supported on the both ends or one end of theconnection, you can set the PVC upper layer carried by the AAL2PATH to theSAALLNK, and then query the packet receiving and transmitting of the PVC byrunning the DSP AALVCCPFMcommand.




74/179

Enable the QAAL2 tracing in the interface tracing on the RNC (Trace -->UMTS Service -

->Interface Trace Task -->QAAL2)and enable the IUB port tracing on the NodeB (theALCAP message must be selected).

The QAAL2 establishment failure occurs in the following cases:

The local end does not send the QAAL2 establishment request message. In thiscase, you must check the parameter settings on both ends.

The peer end does not return the QAAL2 establishment verification message orthe QAAL2_Release_Confirm message. In this case, you must check the specificcause value. For example, if the bandwidth is insufficient, you must check thebandwidth configuration on the peer end.




75/179




76/179


77/179

Introduction to Ethernet, Fast Ethernet and Gigabit Ethernet

It is nearly impossible to discuss networking without the mention of Ethernet, Fast Ethernet andGigabit Ethernet. But, in order to determine which form is needed for your application, itsimportant to first understand what each provides and how they work together.

A good starting point is to explain what Ethernet is. Simply, Ethernet is a very common methodof networking computers in a LAN using copper cabling. Capable of providing fast andconstant connections, Ethernet can handle about 10,000,000 bits per second and can be usedwith almost any kind of computer.

While that may sound fast to those less familiar with networking, there is a very strong demandfor even higher transmission speeds, which has been realized by the Fast Ethernet and GigabitEthernet specifications (IEEE 802.3u and IEEE 802.3z respectively). These LAN (local area

network) standards have raised the Ethernet speed limit from 10 megabits per second (Mbps)to 100Mbps for Fast Ethernet and 1000Mbps for Gigabit Ethernet with only minimal changesmade to the existing cable structure.

The building blocks of today's networks call out for a mixture of legacy 10BASE-T Ethernetnetworks and the new protocols. Typically, 10Mbps networks utilize Ethernet switches toimprove the overall efficiency of the Ethernet network. Between Ethernet switches, FastEthernet repeaters are used to connect a group of switches together at the higher 100 Mbpsrate.

However, with an increasing number of users running 100Mbps at the desktop, servers and

aggregation points such as switch stacks may require even greater bandwidth. In this case, aFast Ethernet backbone switch can be upgraded to a Gigabit Ethernet switch which supportsmultiple 100/1000 Mbps switches. High performance servers can be connected directly to thebackbone once it has been upgraded.




78/179

The UTRP2 provides two 10M/100M/1000M Ethernet optical ports, performs functions

of the MAC layer, receives and transmits data on Ethernet links, and analyzes the MACaddress.

The UTRP9 provides four 10M/100M/1000M Ethernet electrical ports and performsthe functions of the MAC layer and physical layer.

FE Ports on the WMPT

As an interface board, the FG2c board supports IP over Ethernet transmission

Provides twelve channels over FE ports or eight channels over FE ports and fourchannels over GE ports

Provides the link aggregation function at the MAC layer

Provides the routing-based backup and load sharing

Supports the Iu, Iur, and Iub interfaces

As an optical interface board, the GOUc board supports IP over Ethernet transmission

Provides four channels over GE ports

Provides the routing-based backup and load sharing

Supports the Iu, Iur, and Iub interfaces

Label Connector Type Description

FE0 RJ45 connector FE electrical port

FE1 SFP connector FE optical port




79/179

Checking the cable and connector

Checking the cable connection and connector. The cable length can not exceed 100m.Replacethe cable and check the alarm.

Checking the parameter of the FE

Use DSP ETHPORT to check the port state, use LST ETHPORT to query the parameter

of two peers, assure the parameter used are same.

Recommended parameter:

Fault Isolation

1. Use PC connect with NodeB, to check the alarm is cleared or not.

2. Use PC connect with Peer, to check the PCs ETH port is On or not.

3. If step1 s alarm is cleared and step2s LED is OFF, then the peer side may be fault.

4. If step1s alarm is not cleared and step2s LED is ON, the NodeB port may be fault. Inthis case, use RST ETHPORT and RST BRD to reset the port and broad (Must use MMLto reset), then check the chip alarm, if the chip alarm appear, replace broad.

Note: some PCs ETH ports adaptive capability is not good, we can use several PC to test.

[RNC MML] PING IP

[NodeB MML] PING

Port speed Duplex Mode Priority

100M (1000M for GE) Full High

100M (1000M for GE) AUTO Medium

AUTO AUTO Low




80/179

The faults in the data link layer include: The VLAN is faulty, The transmission network

is faulty.




81/179




82/179

Generally, the maximum transmission distance of the Ethernet cable is within 100 m.




83/179

Note:

The port rate and auto-negotiation mode are the direct parameters for twointerconnected devices, for example, they are the interworking parametersused by the NodeB to connect another device directly.

The meaning of consistent negotiation parameters: Take the port rate as anexample, if the port rate on one end is 100 Mbit/s, the port rate on the otherend is also 100 Mbit/s, and the auto-negotiation modes on both ends are

AUTO. The duplex mode is configured in the similar way.

We recommend that: On the both ends, the rate is 100 Mbit/s (for the GE, therate is 1000 Mbit/s)




84/179

Use this command to query the working status and traffic statistics of an Ethernet port.




85/179


86/179

You can use this command to display the status of an Ethernet port, which includes

Max Transmission Unit, Speed, MAC address, Duplex, Physical layer status, and thetraffic information. If there are multiple ports, only the primary information of theports is displayed. If there is only one port, the port information is displayed in detail.




87/179




88/179

Note: The port adaptation of some PCs is not good. You can test several PCs and

choose the best one, or perform the test by connecting the service port andmaintenance port




89/179


90/179

Firstly, the RNC or NodeB query the next hop MAC address (the corresponding ARP

entry) based on the IP route. With the ARP entry, the RNC or NodeB sends the packetsto the ICMP, SCTP, or UDP. If the RNC does not obtain the ARP entry, the RNC sends aARP request broadcast packet and ask for the next hop MAC address

If the RNC and NodeB adopt layer 2 networking, the ARP request is sent to the NodeBor RNC. If the network adopts layer 3 networking, the ARP request is sent to thegateway.

If the transmitting endpoint has the ARP entry, the ARP request packet is nottransmitted.




91/179

If the peer ARP entry is available on both ends, you can infer that the fault is not

caused by the ARP entry If the ARP entry is available on only one end (assume that the ARP entry is available on

the RNC only), after you run the ping command and then run the DSP ARPcommandon the NodeB, if the ARP entry is still unavailable, you must check the VLANconfiguration on the RNC

If the ARP entry is unavailable on both ends, the test procedure is as follows:

Run the ping command on the RNC, and then query the ARP entry on theNodeB, if the ARP entry is available, you can infer that the ARP request sent bythe RNC can be received by the NodeB. Run the DSP ARP command to querythe ARP entry on the RNC. If the ARP entry is available, you can infer that the

fault is not caused by the ARP. If the ARP entry is unavailable, you can inferthat the ARP response on the NodeB is faulty. You must check the VLANconfiguration on the NodeB.

Run the ping command on the NodeB, and then query the ARP entry on theRNC. The description of the query result is similar to the preceding description.

After you run the ping command on the RNC and NodeB, if the ARP entry isnot available on the peer end, you can infer that the transmission network maybe faulty.




92/179




93/179

Use this command to ping a destination IP address from a specified source IP address

of a board to check the connectivity of the IP layer between the local end and the peerend.

The source IP address must be the local IP address of the PPP link of thePEUa/POUa/UOIa(IP)/POUc board, the local IP address of the MP group of thePEUa/POUa/POUc board, the IP address of the Ethernet port of theFG2a/GOUa/FG2c/GOUc board, the IP address of the Trunk group of theFG2a/GOUa/FG2c/GOUc board, the local IP address of the IPoA PVC of theAOUa/AOUc/AEUa/UOIa (ATM)/UOIc (ATM) or the device IP address of the board.

You can run this command again only after the execution result has been returned.

This command is unavailable on the standby port.

To stop a consecutive ping operation, press CTRL+Q.




94/179




95/179


96/179

Function

You can use PING to check the network connections and the network quality. Yon can use Ctrl^Q to Stop PING.

The NodeB stop PING during the BOOTP process.

Note

If the PING packet is bigger than MTU and the peer device does not supportPING packet fragmentation, or the IP transport network shields PING packets,PING will be failed or expire. The IP addresses of the whole network broadcast,0.x.x.x, 127.x.x.x, Type D, and Type E are illegal addresses.

The Source IP address of the command PING can be 0.0.0.0, OMCH localaddress, or the active interface address (including IP address, PPP, and ML PPP

local address). When the IP address 0.0.0.0 is input, the most matched routeto the destination IP address will be automatically assigned, and the IP addressof the outbound port which corresponds to the route will be used as thesource IP address, from which the PING packets will be send.

The parameter of SRC IP must be configured when the command of PING isoperated over board(IP address 0.0.0.0 will make the PING operation failure).




97/179




98/179

Run theADDVLANMAPcommand to configure the VLAN for the next hop data. The

next hop address can be configured with multiple VLANs. Run theADD VLANCLASS to add a VLAN table entry to a VLAN group.

Run the LST VLANCLASS to list all the configured VLAN priority mappingrelationships.




99/179




100/179




101/179




102/179




103/179




104/179




105/179

When the ARP entry is normal, the troubleshooting procedure is as the

troubleshooting procedure of FE faults in IP layer. The FE faults in IP layer are usually caused by the faulty routes.

You must run theADDVLANIDcommand to configure the VLAN to the address tobe pinged if the VLAN must be configured and the Ping switch of the IPPATH isdisabled.




106/179

Use this command to query the real-time information on an IP route carried by the

interface boards.




107/179

Use this command to list the configuration of an IP route.

You can use this command to list all the routes from a specified Subrack No. to acertain destination network address.




108/179

You can use this command to query the information about all reachable IP routes.




109/179

You can use this command to list the information about all the static IP routes.




110/179


111/179

Note

Use this command to start route tracing. Route tracing obtains the informationabout the gateways on the host-to-destination route by sending test packetson the route. By running this command, you may check whether the route isreachable and locate the position where a network connection failure occurs.

The IP addresses of the whole network broadcast, 0.x.x.x, 127.x.x.x, Type D,and Type E are illegal addresses.

The command of TRACERT isn't supported in the over board instance.

This command cannot be used with the PING , CFMTRACE , or CFMPINGcommand.

You can press Ctrl+Q to stop running the TRACERT command.




112/179




113/179


114/179

The SCTP faults are classified into the following two kinds:

The SCTP faults caused by no communication or unilateral communication, forexample, the data is sent to the peer end but no response is retuned; the peerend data cannot be received.

The SCTP faults caused by link interruption, for example, the SCTP intermittentfault, and SCTPLNK down.




115/179

To remove the SCTP faults, you must often use the SCTP message tracing. The SCTP

information chunk falls into many types, such as INIT, INIT ACK, DATA, SACK, ABORT,SHUTDOWN, ERROR, COOKIEECHO, and HEARTBEAT. Figure shows the normal SCTPinteractive messages.




116/179

Check the transmission

Run the ping command to ping the peer address. Check whether the pingaction is successful. If the ping action is not successful, check the route and thetransmission network.

Check the interworking parameter settings

Run the LSTSCTPLNKcommand on the both ends. Check whether the SCTPinterworking parameters are consistent with those on the peer end. The MTUvalues on the both ends must be smaller than or equal to the MTU value of thetransmission network.

Check the upper layer application configuration

Run the LSTSCTPLNKcommand on the both ends. Check whether the SCTPupper layer applications (such as the NCP, CCP, and M3UA) are configured.

Enable the SCTP tracing

If no problem is found in the preceding operations, you can enable the SCTPtracing on the LMT. Compare the tracing message with the normal interactivemessage, and determine whether the packet loss occurs and the position ofthe packet loss.




117/179




118/179


119/179


120/179


121/179




122/179




123/179




124/179

Step 1 Check the configuration and connection

Check the connection. If the backup mode at both ends is not the same, modify the local or the peer end

backup mode to the 1+1 or 1:1 mode.

If the restoration mode at both ends is the same, modify the local or the peer endrestoration mode to revertive or non-revertive. In the 1:1 backup mode, only thenon-restorable mode is optional.

If the switching mode at both ends is not the same, modify the local or the peerend switching mode to single-ended switching or dual-ended switching. HuaweiRNC products do not support single-ended switching in the 1:1 backup mode.

If the MSP is deactivated, activate the local or the peer MSP. If the working channel and the protection channel are inversely connected,

reconnect the optical fiber.

If one end is locked for protection, cancel the protection lock at the local or thepeer end.

Step 2 Check optical interface alarms

Check whether a fault alarm related to the optical interface is generated.

When the SF alarms (such as the LOS, LOF, MS_RDI, and MS_AIS fault alarmsrelated to the optical interface and the APS fault alarms related to the standby

board) are generated, the RNC automatically triggers switching. Check whether the MSP switching alarm maps the optical interface switching

alarm.

Step 3 Check whether the MSP switching alarm is generated due to the local or the peerend fault. If the alarm is generated due to the peer end fault, check the peer end devices.




125/179




126/179




127/179




128/179


129/179




130/179

The RNC OM network is divided into the external network, internal network, MPSnetwork, MPS-EPS network, and EPS network. Each subnet is responsible for certain

functions. External Network

The external network refers to the network between the OMU board and theOM console (LMT or M2000). The external network provides the interface for theOM console to access the OM subsystem.

Internal Network The internal network refers to the network between the OMU board and the

SCU board in the MPS subrack. The internal network provides a bridge for thecommunication between the OMU and the host.

MPS Network The MPS network refers to the OM network between the SCU board in the MPS

subrack and the other boards in the same subrack. The backplane in the MPSsubrack is used to connect entities on this network.

MPS-EPS Network The MPS-EPS network refers to the network between the SCU board in the MPS

subrack and the SCU in each EPS subrack. The connections between the SCUboard in the MPS subrack and the SCU board in each EPS subrack throughEthernet cables comprise the MPS-EPS network. Through this network, the RNCcan transmit the OM information to the SCU board in each EPS subrack throughthe SCU board in the MPS subrack.

EPS Network The EPS network refers to the OM network between the SCU board in an EPS

subrack and the other boards in the same subrack. The backplane in the EPSsubrack is used to connect entities on this network.




131/179




132/179

Run the command DSPOMUto check whether the active and standby OMUs are

normal (the blue part in the following information). Check whether the internal and external networks are normal (the red part in the

following information).

If the internal network is abnormal, check whether the OMU is correctlyinstalled and whether the SCU is working normally.

If the external network is abnormal, check whether the external networkcables are correctly connected.




133/179




134/179




135/179

Run the command DSPOMUto query the status of the active and standby OMUs.

Check whether data synchronization is normal and whether the FE port connection isnormal.

Check whether the standby OMU starts normally. If the standby OMU does notstart normally, start the standby OMU.

For example, after a sudden switchover is performed between the active andstandby OMUs, if data synchronization fails, you can run thecommand DSPOMUto find out the direct cause through the Data-sync statefield in theresult.

If the network is normal, check whether the ALM-20701 OMU Failure Switchoveralarm is generated. If the alarm is generated, do as follows:

Use the troubleshooting method of the ALM-20701 OMU Failure Switchoveralarm to clear the alarm.

If the standby OMU is faulty and cannot be switched back, the onsitepersonnel must check whether the data is the latest, and whether the data onthe OMU and host is consistent. If the data is consistent, you must clear thealarm manually, run the command STP DATASYNCto stop datasynchronization, and run thecommand STR DATASYNCto enable datasynchronization again.




136/179




137/179




138/179


139/179




140/179


141/179




142/179


143/179




144/179

Run the command DSP UCELLto query the cause of the cell setup failure. The

information similar to the following is displayed. Take measures based on the specificcause.

If the cell setup failure is due to NCP unavailability or CCP unavailability, the linkbearing NCP or CCP may be faulty. Check whether an alarm related to thecorresponding SAAL or SCTP link (SAAL: ATM; SCTP: IP transmission) is generated. Ifsuch an alarm is generated, clear the alarm according to help of the alarms

If the cell setup failure is due to FP synchronization failure or Common channel setupfailure, the user-plane transmission bearer may be faulty. Check whether a path alarmis generated.

If the cell setup failure is due to Power mismatch, check whether the local cell on the

NodeB side is normal. If the local cell is unavailable, rectify the fault according to therelevant chapter in the NodeB troubleshooting guide (Chapter 8 "Cell Setup Failure").If the local cell is available, check whether the maximum downlink power on theNodeB side and that on the RNC side. If the former is smaller than the latter, modifythe maximum downlink power on the RNC side or on the NodeB side to ensure thatthe maximum downlink power on the NodeB side is greater than that on the RNC side.

Run the command LST UCELLon the RNC LMT to query the maximum downlinkpower on the RNC side.




145/179

Run the command LST LOCELLon the NodeB LMT to query the maximum downlink

power on the NodeB side. The result is as follows: If the cell setup failure is due to NodeB return cell setup failure and the Cause=NodeB

sends CELL SETUP FAILURE (Frequency acquisition not supported)informationis generated in the ALM-22206 Cell Setup Failed alarm, check whether the frequencyconfigurations on the RNC and the NodeB are consistent (run the command LSTUCELLon the RNC and the command LST LOCELLon the NodeB to query thefrequency configurations).

If the cell setup failure is due to Local cell not reported and the Cause=Dataconfiguration error or inconsistent with physical resourcesinformation isgenerated in the ALM-22206 Cell Setup Failed alarm, check whether the NodeB is

configured with a local cell and whether the parameter configuration of the local cellis consistent with that of the cell on the RNC side (run the command LST UCELLonthe RNC and the command LST LOCELLon the NodeB to query the parameterconfiguration).

If the cell setup failure is due to Common channel setup failed and the setup failure ofthe common channel is due to the allocation failure of L2 resources (Reason of thelatest common channel setup failure = L2 resource allocation failed), check whetherthe service subrack is inserted with DPUs. If DPUs are inserted, run the command DSPBRDto query the status of DPUs. If all DPUs are barred, unbar the DPUs; if all DPUsare abnormal, insert new DPUs or replace the DPUs.




146/179


147/179




148/179


149/179

If the fault is not an emergency service problem, you can infer that only some users

cannot make calls or access the network. To rectify the fault, do as follows: Check whether the cell status is normal, namely, whether cell setup is normal, whether

the cell is available, and whether the cell uplink or downlink traffic is congested. Runthe following commands to query the cell status:

DSP UCELL

DSP UCELLCHK

If the cell is not activated, run the commandACT UCELLto activate the cell. Ifthe cell activation fails, run the command DSP UCELLto query the failurecause.

For the specific cause analysis of the cell activation failure, see Chapter 4 . If the cell is successfully set up, run the command LST UCELLACCESSSTRICT

to check whether the cell or the user AC is barred. If the cell is barred, unbarthe cell.




150/179

Run the DSP UCELLCHKto check whether the cell is in congested state, including powercongestion, code resource congestion, transmission congestion, and CE congestion.

Power congestion:

Power congestion is classified into uplink power congestion and downlink powercongestion. Usually, algorithm 1 is used as the downlink connection admission control(CAC) algorithm, whereas the uplink CAC algorithm is turned off.

If the access failure is due to uplink power congestion, run the command DSPUCELLCHKto check whether the RTWP is within the valid range (96.5 dB to 105.5dB). Run the command LST UCELLCACto check whether the auto-adaptivebackground noise update switch is ON. If the auto-adaptive background noise updateswitch is ON, deactivate the cell, and then re-activate the cell to check whether theRTWP is normal.

If the auto-adaptive background noise update switch is OFF, turn off the uplink CACswitch or reset the background noise. You can use the following command to turn offthe uplink CAC switch:

MOD UCELLALGOSWITCH:NBMUlCacAlgoSelSwitch=ALGORITHM_OFF;

Check the average RTWP value (vs-meanrtwp) in the traffic statistics, and set thebackground noise to the minimum vs-meanrtwp.

The command is as follows:

MOD UCELLCAC: BackgroundNoise=61;

The parameter value depends on the site requirements. By default, it is set to

61. Actually configured noise floor = 112 + BackgroundNoise x 0.1




151/179

If the access failure is due to downlink power congestion, run the command DSP

UCELLCHKto check whether the latest TCP value is normal (


152/179

Code congestion:

Run the command DSP UCELLCHKto check whether the cell used rate ofcode resources is normal and trace the code tree to check whether the celluses too many code words. If the minimum available code words are morethan the reserved code words, the cell capacity is limited and needs expansion.The fewer the code words, the greater the service rate. For example, theavailable minimum code word is SF32 but the configured reserved code wordis only SF16, the admission fails.

Alternatively, you can run the command LST UCELLCACto check whether thereserved code word of the cell is configured according to the baseline data orthe radio parameters for network planning. Newly admitted users cannot use

reserved code words. As a result, the more the reserved code words, the fewercode words available for new users. If the configured value is too small (SF4),you can modify it according to the baseline data. Otherwise, the networkplanners should negotiate with the customer on whether to adjust thethreshold to admit more users or to expand capacity.

If the cell's number of users is too small and available minimum code wordsare fewer than reserved code words, no congestion occurs. You can deactivatethe cell and then re-activate the cell to view the test result.




153/179

Transmission congestion:

Run the command DSP UCELLCHKto check whether Iub interface of the cellis in congested state.

If the Iub interface is in congested state, check whether the reservedbandwidth for the AAL2PATH is too high. By default, the reserved bandwidthis 0. That is, no bandwidth is reserved.

Run the command LST TRMFACTOR to check whether the values configuredfor service activation factors are within the valid ranges. Usually, theseparameters should be configured with recommended values.




154/179


155/179

CE congestion:

Run the command DSP UCELLCHKto check whether the CEs of the cell arecongested.




156/179

Check whether the LAC/SAC/RAC data is configured and activated on the CN side

(MSC/SGSN). If this data is not configured, UEs cannot register to or attach themselvesto the network. You can trace the intelligent optimum sample (IOS) of the cell tocheck whether a UE can register on or attach to the network normally.

When the SAC data is not configured on the CN side, the RNC fails to send theinitial direct transfer message for setting up signaling connection control part(SCCP) connection. As a result, the UE cannot access the network.




157/179

Check whether the AAL2Path or IPPATH is available and configured correctly.

Run the command LST TRMMAPto check whether the transmission mappingis set correctly. For example, in the ATM transmission, CS services map RTpaths (primary paths) and NRT paths (secondary paths); R99 PS services mapNRT paths (primary paths) and RT paths (secondary paths); High Speed PacketAccess (HSPA) services map HSPA NRT paths. High Speed Downlink PacketAccess (HSDPA) services and High Speed Uplink Packet Access (HSUPA) servicesmap with each other. Run the command LST AAL2PATHor LST IPPATHtocheck whether the mapped path in the TRMMAP is actually configured.

According to the preceding result, the AMR service can be set up only after anRT_VRB type AAL2 path or an EF type IP path is configured.

If the service is not recovered, please ask Huawei engineer for help.




158/179




159/179




160/179


161/179

Check whether the licenses for the HSPA functions are valid

Run the command DSPLICUSAGEto check whether the High SpeedDownlink Packet Access (HSDPA) and High Speed Uplink Packet Access(HSUPA) functions are enabled. If the functions are not enabled, you mustapply for licenses to activate the HSPA functions.

Check data configuration

Run the command LSTUNODEBto check whether the NodeB protocolversion is configured correctly. The REL-5 version supports the HSDPA, and theREL-6 version supports both the HSDPA and the HSUPA.

Check the occupation of the code tree in the cell

Check the occupation of code tree resources in the cell. Usually, the HSDPAservice uses the last five SF16 code tree resources. If the resources aredistributed to R99 users, the HSDPA service cannot be set up.




162/179




163/179


164/179

Step 2 Check whether the number of HSPA users is limited

The number of HSUPA users and the number of HSDPA users are independentfrom each other. Therefore, you need to set admission thresholds at both thecell level and the NodeB level.

The maximum number of HSPA users supported by a cell is MIN (valuespecified in the RNC license, value set in the cell CAC algorithm). The RNClicense controls the maximum number of HSPA users a single cell, which canbe queried through the command DSPLICUSAGE. This number is subject tothe maximum number of HSPA users that are supported. For example, the64HSDPA Users per Cellswitch is ON, indicating that the cell supports up to64 HSDPA users.




165/179

Run the command LST UCELLCACand set the numbers of HSUPA users and HSDPA

users in the cell CAC algorithm.




166/179

Run the command LST UNODEBLGOPARAto query the maximum number of HSPA

users supported by the NodeB. By default, this number is 6144. Access failure rarelyoccurs.




167/179

Run the command DSP UCELLCHKto query the number of HSPA users supported by

the serving cell. If the result is equal or close to the number of users permitted in thelicense or configured in the CAC algorithm, the access fails due to the admissionthreshold for HSPA users. You need to re-apply for the relevant license or modifyadmission threshold for users.




168/179

Step 3 Check the AAL2PATH and IPPATH configurations

Check whether the AAL2PATH (ATM) or IPPATH (IP) are configured on the RNCand NodeB. You must view the corresponding transmission resource mappingtable. Run the command LST TRMMAP, and the following information isdisplayed.

Run the command LSTAAL2PATHto check whether the AAL2PATH with thecorresponding properties is configured. For example, according to thepreceding result, the HSDPA service can be set up only when the AAL2PATHconfigured with theATMHD UBRis available. Check the HSUPA service in thesame method.

Step 4 Check whether the AAL2PATH and IPPATH are available

If the AAL2PATH and IPPATH are configured, check whether these paths areavailable.




169/179

Step 5 Check the MBR assigned by the CN

The RNC determines whether to use the HS-DSCH or E-DCH to bear the servicebased on the MBR assigned by the CN and the preset threshold. If the MBRassigned by the CN exceeds the threshold for setting up the HSPA service, theservice can be set up on the HS-DSCH/E-DCH. Otherwise, the service is borneon the E-DCH. The thresholds for the BE service and streaming service are setindependently.

As shown in the following figure, the MBR is assigned in theRANAP_RAB_ASSIGNMENT_REQUSETmessage.




170/179

You can run the command LST UFRCCHLTYPEPARAto query the threshold

for setting up the HSPA service. If the uplink rate assigned by the CN is lowerthan the threshold for setting up the HSUPA service, you should negotiate withthe operator on whether to modify the threshold to set up the HSPA service.

Alternatively, you can modify the subscription information on the HLR. Checkthe consistency between the IMSI information and the CN-assignedinformation before the modification. The subscription information on the HLRmay be correct, but an AT command is used to limit the rate during the dial-up. Instead of providing a solution to the problem, the modification of thethreshold for setting up the HSPA service can only ensure the setting-up of theservice on the HS-DSCH. The service rate for users is still under the control of

the MBR. Therefore, it is necessary to modify the subscription information onthe HLR or cancel the AT command for limiting the service rate.

Step 6 Check the health of a cell

Run the command DSP UCELLCHKto check the health of a cell and whetherthe cell is in congested state.

Step 7 If you cannot solve the HSPA service setup failure, please ask Huaweiengineer for help.




171/179




172/179

The PS relocation fails. During Iu interface tracing, the RNC initiates the relocation.

After the CN sends the relocation command, the RNC cancels the relocation. The cause of relocation cancellation is iu-transport-connection-failed-to-establish.

Abnormality information (such as GRA FAIL) is displayed in the CDT.




173/179




174/179

The IP routes on the Iur interface are used to forward the PS data during Serving Radio

Network Subsystem (SRNS) relocation. During the SRNS relocation, the PS data istransferred from the l

5. Owc403700 Bsc6900 Wcdma v900r014 Troubleshooting Issue 1.

Documents

Transcript of 5. Owc403700 Bsc6900 Wcdma v900r014 Troubleshooting Issue 1.