Fxs Card Loopbacks - Zhone IMACS 8000 User Manual

Running Head
FXS Card User Screens and Settings
CODING
The Coding setting sets the PCM companding method used for a port. Generally, the North
American T1 environment uses m-law coding, and the International E1 environment uses
a-law or a-inv (inverted A-law) coding. The a-inv setting provides a higher ones density than
a-law. The default coding setting is determined by the type of associated WAN card.
TC CGA
The Trunk Conditioning during Carrier Group Alarm setting defines whether the FXS port
should be forced idle or busy upon declaration of a Carrier Group Alarm (CGA) on the WAN
link to which the port is assigned. In most cases, you should set this parameter to busy. If a
call is in progress when the CGA alarm is received, the system will hold the call for two
seconds, drop it, and then busy out the port to the attached PBX for the duration of the alarm.
Once the alarm clears, the system will automatically place the port back in the idle mode,
making it available to the PBX.
LB
The Loopback field lets you loop the port back toward the network and far end. The dgtl
(digital) loopback sends the incoming digital DS0 signal back to the far end without decoding
it. The anlg (analog) loopback sends the decoded analog signal back to the far end after
decoding and then re-encoding it. Figure 12-3 shows the loopback options, which allow you
to test and troubleshoot the FXS card. To disable a loopback, set this field to off.
12-10
FXS Card
Codec
Analog Digital
Loopback Loopback
Digital-to-Analog
Convertor
Figure 12-3.FXS Card Loopbacks
PCM Bus
T1/E1
DS-0
Model No.
FXS Card
Network
Voice Cards