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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.
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• 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
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Signaling systems
For access signaling there are different systems:
- Analogue signaling
(PSTN)
- Digital subscriber signaling
(ISDN)
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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
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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.
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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)
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CAS
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• 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.
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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
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Advantages of SS7
• High speed
• High Capacity
• High Reliability
• High Flexibility
• Reduced equipment volume• Multiservice
• Improved economy
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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)
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Message Transfer Part
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