8
Disabled
, and the module acts as a HOST device in this default setting. This feature
can be selected only by setting the DIP Switches manually.
Loopback Testing
The iMcV-DS3/E3/STS-LineTerm includes two loopback test modes: Coax Loopback
and Fiber Loopback.
The following illustrations show the path that a signal takes in each of the loopback
test modes.
Each loopback performs the following:
Copies the incoming signal back out to the origin while continuing to
transmit this signal downstream.
Blocks downstream data from arriving on the looped data line.
Loopback testing is useful for troubleshooting problems with network connections
should they occur. Looping received data back onto the transmit path helps
determine whether a connection is still valid. Remote loopback tests isolate problems
on the coax run between an iMcV-DS3/E3/STS-LineTerm module and the connected
device, while local loopback tests can isolate problems on the fiber connected to the
module.
9
The following illustrations show a typical progression of loopback tests (i.e., starting by
checking the coax segment at the local side, then the fiber segment at the remote
side, etc).
NOTE
Physical fiber loopback capability is only available when performing the loopback at the Host.
The Remote unit will not loop the customer data back unless the Remote management DIP
Switch #10 is set to OFF.
