05-Trunk & Signaling Data of a Interface

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Initial ConfigurationM900/M1800 BSC Data Configuration Manual Chapter 5 Trunk & Signaling Data of A Interface

Chapter 5 Trunk & Signaling Data of A Interface

5.1 Overview

The A interface in this chapter refers to Asub interface and A interface.

Here, take multi-module BSC as an example for illustrating trunk & signaling data

configuration of A interface in BSC Data Auto Configuration System of Huawei OMC.

5.2 Configuring Relationship between CICs and TrunkCircuits

Click in the [Local Office Information] tab page of BSC Auto Data

Configuration System. The system pops up an interface, as shown in Figure 1.1.

Figure 1.1 Local Data Default Configuration

Select the [A-Interface Timeslot Occupies] tab page, and set the parameters properly,

as shown in Figure 1.2.

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Figure 1.2 A-Interface Timeslot Occupies

See Table 2.1 for the description of the parameters in [A-Interface Timeslot Occupies].

Table 2.1 Description of the parameters in [A-Interface Timeslot Occupies]

Parameter name Default Description

TC Board Timeslot 0

Occupies CIC

Selected "TC Board Timeslot 0 Occupyies CIC" and "Reserve" can be

selected alternatively. When the former is selected, the Default"Reserve" is unavailable.

TC Board Timeslot 1

Occupies CIC


selected alternatively. When the former is selected, the Default

"Reserve" is unavailable.

TC Board Timeslot

16 Occupies CIC


selected alternatively. When the former is selected, the Default


TC Board Timeslot31 Occupies CIC

Selected "TC Board Timeslot 31 Occupyies CIC" and "Reserve" can beselected alternatively. When the former is selected, the Default


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Parameter name Default Description

Auto Calculation Selected If "Auto Calculation" is selected, it indicates that the system

automatically calculates the corresponding relationship betweenCICs and the trunk circuits of all FTCs.

If "Auto Calculation" is deselected, and "Auto-Calculate Circuit

Property" is selected in the [Basic Information] tab page of the

[Set FTC Board Property] interface during FTC property

configuration, the designated board will automatically calculate

circuit property.

Suppose that "TC Board Timeslot 0 Occupyies CIC" and "Auto Calculation" are

selected. Then click to continue. In the [Hardware] tab page, double click the

FTC configured in Slot2 of Frame4, to pop up the [Set FTC Board Property] interface,


Figure 1.3 Circuit Property-TC timeslot 0 occupies CIC

As shown in the [Circuit Property] tab page in Figure 1.3, the system automatically

allocates CIC 0 to TS0 of FTC.

Suppose that "TC Board Timeslot 0 Occupies CIC" is not selected and "Auto

Calculation" is selected. Then click to continue. In the [Hardware] tab page,

double click the FTC configured in Slot2 of Frame4, to pop up the [Set FTC Board

Property] interface, as shown in Figure 1.4.

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Figure 1.4 Circuit Property-TC timeslot 0 reserves CIC

As shown in the [Circuit Property] tab page in Figure 1.4, the system automatically

allocates CIC 65535 to TS0 of FTC. CIC 0 is reserved, instead of being allocated to

other timeslots.

If to manually adjust the corresponding relationship between CICs and the trunk

circuits of the designated FTC, deselect "Auto Calculation" in the [A-Interface

Timeslot Occupies] tab page. Then double click this FTC and deselect "Auto-

Calculate Circuit Property" in the [Circuit Property] tab page of the [Set FTC Board


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Figure 1.5 Circuit Property-deselect "Auto-Calculate Circuit Property"

In Figure 1.5, the user can manually adjust the corresponding relationship between

CICs and the trunk circuits of the designated FTC.

To manually adjust the corresponding relationship between CICs and the trunk

circuits of the designated FTC, deselect "Auto Calculation" in the [A-Interface

Timeslot Occupies] tab page. Then double click this FTC and select "Auto-Calculate

Circuit Property" in the [Circuit Property] tab page of the [Set FTC Board Property]

interface, as shown in Figure 1.6.

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Figure 1.6 Circuit Property-select "Auto-Calculate Circuit Property"

Select the [Advanced] tab page shown in Figure 1.6, and input CIC in the field of

[Start CIC No.]. Then click . The system will automatically calculate the

corresponding relationship between CICs and the trunk circuits of the designated

FTC.

In BSC, 1 CIC can only correspond to 1 trunk circuit. During the interconnection of A

interfaces, because the corresponding relationships between CICs and trunk circuits

adopted by different manufacturers are slightly different, the corresponding

relationship between each CIC and trunk circuit should be negotiated with MSC.

Whether each timeslot of TFC occupies a CIC should also be negotiated with MSC.

Generally, each timeslot should occupy a CIC.

Note:If "Auto Calculation" is selected in Figure 1.2, only the start CIC No. of the FTC configured in Slot2 of

Frame4 can be modified. The other CICs are numbered sequentially from the start CIC No.

5.3 Configuring SS7 Data

SS7 data configuration is to configure the data shown in [Hardware] tab page of

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Module [0] shown in [Object List] window, mainly the SS7 signaling data of E3M.

Figure 1.1 Hardware in Module0

When multi-module BSC is fully configured, Module0, i.e., AM/CM, contains total 16

E3Ms, which correspond to 8 BMs (Every 2 E3Ms correspond to 1 BM).

In Figure 1.1, the 2 leftmost E3Ms in Frame3 correspond to BM1, i.e., the one in Slot2

corresponds to the TCSM of Frame4 in 5.4.1 IFigure 1.1, while the other in Slot3corresponds to the TCSM of Frame5 in 5.4.1 IFigure 1.1. The next 2 E3Ms

correspond to BM2. By analog, the other corresponding relations can be obtained.

Caution:

The E3M with an even board No. must correspond to the TCSM with an even frame No. Otherwise,

TCSM cannot work normally.

Double click the E3M in Slot2 of Frame3 to pop up the [Set E3M Board Property]

interface, as shown in Figure 1.2.

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Figure 1.2 Set E3M Property

As shown in Figure 1.2, the This E3M is correspond to BM [1] logically displayed

indicates that this E3M corresponds to BM1.

If an E1 port is selected, it indicates that this port is used to transmit one SS7

signaling link. Ports 03 are respectively connected to the 4 TCSM units (from left to

right) of Frame4 in BM1. Generally, [Interface Type] is set as "A Interface", and [Trunk

Work Mode] is set as "A Interface CSS Mode".

If [MSM TS] is set as "16", TS16 of the 4 FTCs of the TCSM unit will become

unavailable.

For the description of the parameters, please refer to II. Configure SS7 link in 3.3.2

Transmission Interface Frame of Chapter 3 BSC Hardware Data.

Note:If there are 2 links in a BM, the 2 links should be connected to 2 LPN7s.

In Figure 1.2, double click a link in the [Signaling Link] list (e.g. link 4) to pop up the

[Signaling Link Property] interface, as shown in Figure 1.3.

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Figure 1.3 Signaling Link Property

The information in the [Signaling Link Property] interface must be consistent with that

at MSC side. Especially, due to unified numbering in BSC, the values of [Signaling

Link Code] and [Signaling Link Code Transmission] cannot be repeated in the same

multi-module BSC.

Reference:

[MTP Link Table] in M900/M1800 Base Station Controller Data Configuration

Reference - Engineering Parameters

5.4 Configuring BM Data

To describe BM data configuration, here, take "Module [1]" (namely, BM1) as an

example.

I. Full Configuration of BM 1

Select "Module [1]" in the [Object List] window of BSC Data Auto Configuration

System. On the right, the [Hardware] tab page will be displayed.

The full configuration of BM1 is shown in Figure 1.1. In this interface, FTC and the

BIE that transparently transmits SS7 signaling need be configured.

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Figure 1.1 Full configuration of BM1

II. FTC

Double the FTC in Slot2 of Frame4 to pop up the [Set FTC Board Property] interface,


Figure 1.1 Circuit Property (a)

If the circuit state is "Unavailable", it indicates that the circuit is used to transmit

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signaling and sync. information. If the state is "Available", it indicates that the circuit is

used for voice and data transmission.

There are 32 circuits in each FTC. The 1st circuit is used to transmit sync. information.

The circuit type is automatically configured as "A/PB Signaling Link", and the circuit

state is "Unavailable".

Because Port0 of the E3M in 5.3.1 IFigure 1.2 is configured with SS7 signaling, and

Slot 16 of the E1 on MSM is used for SS7 signaling transmission, accordingly, Slot16

of each FTC in this TCSM is unavailable, as shown in Figure 1.2.

Figure 1.2 Circuit Property (b)

The last timeslot of each TCSM unit is used to transmit TCSM maintenance

information. The corresponding trunk circuit must be configured as "A Maintenance

Link". Otherwise, it will lead to call loss. The last timeslot is automatically configured

by the system, as shown in Figure 1.3. In the meantime, the corresponding trunkcircuit at MSC side must be configured as "Unavailable".

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Figure 1.3 Circuit Property (c)

Select the [Advanced] tab page in the [Set FTC Board Property] interface, as shown

in Figure 1.4.

Figure 1.4 Advanced property

Because this FTC is the first one in BM1, the start CIC No. can be modified. If "Auto

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Calculation" is selected in 5.2.1 IFigure 1.2, the CICs of other FTCs will be

automatically be generated by the system, and cannot be modified.

Generally, "Circuit Availability Indication" should be selected. Otherwise, the circuit

states of the designated FTC will become "Unavailable and CICs will become

"65535", as shown in Figure 1.5.

Figure 1.5 Circuit Property (d)

Double click a record of circuit No. shown in Figure 1.4, or select a record and then

click . The interface will pop up as shown in

Figure 1.6, circuit pool No. can be modified corresponding to [Circuit No.].

Figure 1.6 Modify Circuit No. & Circuit Pool No.

See Table 6.1 for the relationship between circuit No. and voice version described in

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GSM 08.08.

Table 6.1 Relationship between circuit Nos. and voice versions

Circuit pool No. Voice version

1 Support full rate voice version 1 and full rate data service (12, 6, 3.6 kbit/s).

2 Support half rate voice version 1 and half rate data service (6, 3.6 kbit/s)

3 Support the voice versions described in circuit pool N0.1 and No.2 above.

4 Support full rate voice version 2 and full rate data service (12, 6, 3.6 kbit/s).



7 Support the voice versions described in circuit pool No.1, N0.2 and No.4

above.

23 Support full rate voice version 3 and half rate voice version 3

24 Support full rate voice version 3, half rate voice version 3, full rate data

service (12, 6, 3.6kbit/s)

25 Support full rate voice version 1,full rate voice version 2,full rate voice

version 3,full rate data service (12, 6, 3.6kbit/s) and half rate voice version 3

27 Support full rate voice version 1,full rate voice version 2,full rate voice

version 3, full rate data service (12, 6, 3.6kbit/s), half rate voice version 1,

half rate voice version 3, and half rate data service (6, 3.6kbit/s)

If 12FTC is in use, select "Circuit Pool 1". If 13FTC is in use and EFR is adopted,

select "Circuit Pool 5". If 13FTC is in use but EFR is not adopted, select "Circuit Pool

1".

If "Valid for All Circuits" is selected in Figure 1.6, the modifications will be valid for all

trunk circuits.

III. Configuring Transparent-transmission BIE

In BSC Data Auto Configuration System, generally, BIE 16 of Frame3 in IFigure 1.1 is

automatically configured as the BIE that transparently transmits SS7. It is

recommended that the default configuration be adopted. Double this BIE to pop up

the [Set BIE Board Property] interface, as shown in Figure 1.1.

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Figure 1.1 Configure the BIE that transparently transmits SS7

If "Transparent Transmission of SS7 Signaling" is selected, it indicates that this BIE is

used to transparently transmit SS7 signaling. If it is deselected, the [BIE Port

Networking Property] tab page will be displayed, as shown in Figure 1.2. The [BIE

Port Networking Property] tab page is used for BTS configuration.

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Figure 1.2 Configure the BIE that is not used to transparently transmit SS7

5.5 Adjusting A Interface Circuit Manually

Generally, A interface data need be manually adjusted during the establishment of

new BSC office, or when a large-scale upgrade is performed for BSC. This subsection

first introduces some concepts related to A interface circuits, and then describes the

methods for manually adjusting A interface circuits.

5.5.1 Configuring Trunk Circuit

I. Trunk Circuit Classification

The trunk circuits of Abis interface and A interface are sequentially numbered within a

BM in BSC. Abis interface circuits and A interface circuits can be differentiated by

circuit type and trunk group.

BSC automatically allocates 2 trunk groups to each BM. One is A interface trunk

group, and the circuit type is TC. The other is Abis interface trunk group, and the

circuit type is BIE. Here, take the full configuration of the BIE frame in BM1 as an

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example.

Figure 1.1 Full configuration of the BIE frame

II. Configuring Abis Interface Trunk Group

Abis interface trunk circuits are numbered as per BIEs. Each BIE group occupies 256

trunk circuit numbers.

In IFigure 1.1, the trunk circuits of BIE 0 are numbered from 0. BIE 16 is used to

transparently transmit SS7.

BIE groups 06 each occupy 8 HWs. BIE groups 78 each occupy 4 HWs. The trunk

circuits of BM 1 that are numbered 01919 (256 7 + 128 - 1) are Abis interface

trunk circuits. "256 7" denotes the number of circuits occupied by the first 7 BIE

groups. "128" indicates that the 8th BIE group only uses 128 trunk circuits. 1 is

subtracted because the trunk circuits are numbered from 0. The system automatically

allocates 256 trunk circuit numbers to each BIE group. Therefore, The last 128 trunk

circuit numbers (19202047) that the 7th BIE group corresponds to are not used.

The trunk circuits numbered as 20482175 are the ones used by the BIE that

transparently transmits SS7. Therefore, The last 128 trunk circuits numbered as

21762303 that the 8th BIE group corresponds to are also not used.

Though only 1 timeslot is used to transmit a piece of SS7 message, the trunk circuits

occupied by the BIE are all in unavailable states, and the circuit type is "A or Pb

Interface Signaling Link", because the BIE cannot be used for other purposes. If two

SS7 links are configured in the [E3M Board Property] interface, the BIE timeslots of

the two signaling links must be different.

Because FTC trunk circuits of are numbered after BIE trunk circuits, FTC numbers

and circuit numbers will be changed after a BIE is delected, Therefore, BIE generally

should not be deleted.

For the BIE that is not in use, please configure it displayed in IFigure 1.1 as invisible,

so that it can not be viewed in BSC Maintenance System.

III. Configuring A Interface Trunk Group

The full configuration of TCSM frame is shown in Figure 1.1.

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Figure 1.1 Full configuration of TCSM frame

Numbering of the trunk circuits of FTC starts from 2304. These trunk circuits

respectively correspond to the CICs of A interface and the trunk circuits of E3M.

Each FTC provides 32 trunk circuits. In Figure 1.1, the first TCSM unit in Frame4contains 4 FTCs. The trunk circuit numbers for the 4 TFCs are 23042335, 2336

2367, 23682399 and 24002431 respectively (from left to right). The trunk circuits of

the other 3 TCSM units in Frame4 are also sequentially numbered from left to right,

and the No. range is 24322815. Likewise, the trunk circuits of the TCSMs in Frame5

are numbered as 28163327.

All the trunk circuit numbers are automatically generated by the system, and need not

be modified manually.

5.5.2 Configuring E3M Trunk Circuit

Before and after an FTC trunk circuit is demultiplexed by MSM, the FTC trunk circuit

No. is the same. One port on E3M corresponds to one TCSM unit. Therefore, there is

a one-to-one relationship between FTC trunk circuits and E3M trunk circuit No..

The full configuration of the control frame in AM/CM is shown in Figure 1.1.

Figure 1.1 Full configuration of the control frame

E3M trunk circuits in the whole BSC are sequentially numbered from 0. An E3M

provides 512 trunk circuits. For example, No.0 E3M of Frame3 in Figure 1.1

corresponds to the 4 TCSM units of Frame4 in 5.5.1 IIIFigure 1.1, i.e. trunk circuits

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numbered as 23042815 correspond to E3M trunk circuits 0511. No.1 E3M of

Frame3 corresponds to the 4 TCSM units of Fame5 in 5.5.1 IIIFigure 1.1, i.e., trunk

circuits numbered as 28163327 correspond to E3M trunk circuits 5121023.

E3M trunk circuit numbers are automatically generated by the system, and cannot be

manually modified.

5.5.3 Adjusting CIC Manually

Caution:

Manual adjustment of CIC may lead to abnormal operation of the system. Make ensure that the CIC is

correct.

Each trunk circuit of FTC may correspond to a CIC. CIC must be unique, and should

be determined based on negotiation with MSC.

The 5.2Configuring Relationship between CICs and Trunk Circuits subsection has

described how the corresponding relationship between CICs and trunk circuits is

automatically generated by the system or is manually adjusted. This part will focus on

how to manually modify the corresponding relationship between CICs and FTC trunk

circuits.

Deselect "Auto Calculation" in the [A-Interface Timeslot Occupies] tab page as shown

in 5.2.1 IFigure 1.2. Then double click an FTC to pop up the [Set FTC Board


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Figure 1.1 Circuit Property

Deselect "Auto-Calculate Circuit Property", as shown in Figure 1.2.

Figure 1.2 Circuit Property

In the [Circuit Property] tab page, [State], [CIC] and [Circuit Type] of each trunk circuit

of the FTC can be modified.

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[State] can be set as "Unavailable", "Available" or "Blocked". [Circuit Type] can be set

as "A Traffic Link", "A/PB Signaling Link" or "A Maintenance Link". CIC can be directly

input.

Trunk circuit 0 of FTC must be used to transmit sync. signals. The state is

"Unavailable", and the circuit type is "A/PB Signaling Link".

The trunk circuit for SS7 signaling transmission must be consistent with the one in

MSC. The state of it is "Unavailable", and the circuit type is "A/PB Signaling Link".

The signaling timeslots on MSM are fixedly demultiplexed to the corresponding

timeslots of the 4 corresponding FTCs. Therefore, if trunk circuit 16 of FTC 0 in a

TCSM unit is used to transmit SS7 signaling, the same configuration must be adopted

for trunk circuit 16 of the other 3 FTCs.

[MSM TS] must be configured in consistency with that in 5.3.1 IFigure 1.2.

Trunk circuit 31 of the last FTC in each TCSM unit must be configured as "A

Maintenance Link", and [State] should be configured as "Unavailable".

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05-Trunk & Signaling Data of a Interface

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