Cbr Loopbacks; Setting Vcm Loopbacks - 3Com SuperStack II PathBuilder S330 Reference Manual

182 C 5: P B
HAPTER ATH UILDER

CBR Loopbacks

Setting VCM Loopbacks

S330 D P
IAGNOSTICS AND ERFORMANCE
Figure 156 E3 Loopback Options
Network Side
Line
The following loopbacks are available for the CBR module:
Network Line — Loops the T1-DSX received data back on the output side after
the digital data has been recovered.
Local Card — Loops the transmit T1-DSX output on the receive side; the
transmitted data will continue to go on the output.
Network Card — Loops the T1-DSX received payload back toward the line
output.
Figure 157 illustrates the CBR T1-DSX loopbacks.
Figure 157 CBR Loopback
Network Side
Line
For the voice compression module, you can set card/line and channel loopbacks
and you can set tone injection. When you set a VCM loopback, the MCPU sends a
message to the VCM card to perform a maintenance function, and the VCM
replies with an acknowledgment. When the VCM enters maintenance mode, it
generates an alarm to the MCPU. Only one maintenance function per port or per
channel is allowed.
S
TATISTICS
E3 Interface
Network Card
Local
Payload
CBR Interface
Network Card
Local
Payload