In the past I used to look at the Linecards for wireline POTS / ISDN.
The Linecards provided the following capabilites:-
-Battery feed for the two-wire interface (A and B Legs)
-Overload Protection to alleviate potential damage to the delicate SLIC / SLAC circuits
-Ringing. Ringing current for the CPE.
-Signalling. Conveying signals to the CPE: Off-hook dial tone, Ringing signal for the CPE bell, on-hook
-Codec. Enabled speech signals to be sampled, quantised and encoded by the PCM SLIC/SLAC circuits
-Hybrid Circuit. Enabled the conversion of Two Wire to Four Wires (RX / TX)
Test Network. Test the Two-Wire interface.
Recommend that you re-use the standard AXE10 installation / commisioning test cases. These are basically
a standard set of tests that can be customised.
If you are performing basic Wireline POTS testing then you can equip several CPE to the AXE10 switch.
Calls can be setup and the wireline signalling validated. Time duration should e noted for each call and this
should be cross checked with the Toll Ticket (Charging Data Record – CDR). Loop Disconnect and MF4 signalling
should be checked. For SS7, a loopback route can be setup on the AXE10 BYB switch.
For performance testing you will need Traffic Generators with the AXE10 Linecards.
CLIC – Complete Line Interface Circuit
PCM – Pulse Code Modulation
SLIC – Subscriber Line Interface Circuit
SLAC – Subscriber Line Audio Circuit
VBR/ Wallis Dudhnath