AXE ERICSSON

7/29/2019 AXE ERICSSON

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The convergence will start in the network core, which will carry all typesof traffic in packets, and have the following layered (“horizontal”)structure:

• Connectivity backbone network - optimized for the transport

and switching of large amounts of data

• Service and control layer - here the intelligence in the networkresides for everything from call control to signaling.

• Content and application servers - reside outside the network

itself - for instance, on the Internet

• It is possible to use common fiber, synchronous

digital hierarchy (SDH), and synchronous optical network

(SONET) technology as a common transport network for a number

of different services.



• The AXE 810 system further strengthens AXE’s position as being a

leading switching system and telephony server node plus a vehicle

for migration to multi-service and 3G networks. Other emerging

Ericsson system platforms will gradually supplement AXE on the

Server layer and the Media Gateway layer.• The main features of AXE are as follows:

• AXE modularity

• Meeting network operators requirements

• AXE as a telecommunications node



Signaling systems

For access signaling there are different systems:

- Analogue signaling

(PSTN)

- Digital subscriber signaling

(ISDN)



Analogue signaling

• The information about the B-number, from the subscriber on the

analogue connection to the exchange is normally transferred either

by decadic pulses or as a combination of two tones.

• The combination of tones is known as dual tone multi frequency

(DTMF) signaling. Two tones are used for each digit



Digital signaling

• Digital subscriber signaling system no. 1 (DSS 1) is the standard

access signaling system in ISDN and is also called a D-channel

signaling system.

• The signaling protocols are based on the open systems

interconnection (OSI) reference model layers 1 to 3.



Inter-exchange signaling

• Inter-exchange or trunk signaling can be divided into two main

categories or methods:

• Channel Associated Signaling (CAS)(speech and signaling follow the same

physical way through the network)

• Common Channel Signaling (CCS)(define an independent logical signaling

network)



CAS



• The register signals are only used during the call set up phase. The

line signals can be sent and received before, during, and at the end

of the call.



CCS

Services that require signaling transmission via the

SS7 network are Telephony, ISDN, Data Networks, Intelligent

Networks (IN), Mobile Services -> different User Parts (UP) or

Applications Part (AP) have been developed



Advantages of SS7

• High speed

• High Capacity

• High Reliability

• High Flexibility

• Reduced equipment volume• Multiservice

• Improved economy



SS7 BASIC STRUCTURE

• CCS is divided into:

- User Parts/Application Parts (Telephone User Part - TUP, ISDN User Part - ISUP)

- Message Transfer Part (MTP) (common transport system for reliable transfer of

signaling messages)

MTP is used to deliver signaling packages between two signaling

points in the network.

Packages should bee:

- Correct (errors detected and corrected by the system)

- Correct order (if re-transmissions have to be made, the order of the signals must not be

changed)



Message Transfer Part

AXE ERICSSON

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