Line And Local Loopbacks; Line Loopback - Zhone IMACS 8000 User Manual

Running Head
WAN Card User Screens and Settings
LINE LB
The Line Loopback setting loops the T1/E1 line back toward the network, as shown in Figure
9-16. This loopback also continues sending the incoming data toward the CPE. Choosing on
allows you to test the end-to-end T1/E1 circuit path from the far end. Choosing off disables
the loopback and restores the normal signal path in both directions. If the WAN is in loopback
due to a remote device, the loopback will be dropped if you choose on.

Line Loopback

Local Loopback
LOCAL LB
The Local Loopback setting allows you to loop the full T1/E1 line back toward the CPE, as
shown in Figure 9-16. This loopback also continues sending CPE data toward the network.
Choosing on allows you to test the local system. Choosing off disables the loopback and
restores the normal signal path in both directions. If the WAN is in loopback due to a command
from a remote device, the loopback will be dropped if you choose on.
9-26
WAN Card
PCM Bus
WAN Card
PCM Bus
Figure 9-16.Line and Local Loopbacks
WAN Card
Network
T1/E1
Network
T1/E1
Model No.
System Cards