User Manual

Demand Assignment
System Overview GSI 002
605-0000-450
Draft Issue 1.3dr Date 8/02/00
Page 15 of 16
6. System Interfaces
Interfaces between the various elements of the AS4000 system are as follows:
6.1. AC Management Interface
The AC provides up to two asynchronous ports for connection to a management
system. These ports will carry all management information for the AC and all dependent
CTs that do not have independent management communications.
All elements of the AS4000 System (AC, CT and ST) can be managed from a single
Sitespan server connected at the Access Concentrator.
6.2. CT Management Interface
CT Modem Shelf management will be either via the AC / CT E1 link in which case
communications are presented at the AC management port, or via a direct
asynchronous communications link.
6.3. Customer Interfaces
The telephony system supports CAS, V5.1 and V5.2 connections to the switched
Network and supports the full range of advanced services supported by this interface,
including CLASS services and Subscriber Pulse Metering (SPM).
The data (L128) system connects to the network using 2Mbit/s G703 HDLC protocol.
For ISDN the host network interconnects to the AS4000 using a 2Mbit/s G.703
interfaces. The signalling is a Q.931 message based “Euro-ISDN” protocol, that meets
the NET.5 ISDN approval standards for Primary Rate Interfaces.
The AS4000 Wireless Fixed Access System provides a single product platform that can
deliver a mixture of dedicated link services. These include:
• Plain Old Telephone System (POTS). equivalent service
• Fixed line 2x 64 kbit/s data services
• Fixed Line ISDN basic rate access 144kbit/s
6.4. The Exchange Interface
The interface between the AS4000 system and the switch is N x 2Mbit/s G703 / G704
(1 per radio carrier typically 4 per CT).
For the Demand Assigned AS4000 system the Access Concentrator (AC) provides the
primary network interface which is N x 2Mbit/s, as per ITU recommendation G.703,
short haul 6dB, G.704 and ETSI ETS 300-166.