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Chapter 6 Troubleshooting and Diagnostics Installation and Operation Manual
6-22 Testing ASMi-52 ASMi-52 Ver. 2.5
Running the Remote Loopback
The remote loopback (RLB) checks the performance of both the local and remote
ASMi-52 modems, and the lines connecting them (see Figure 6-24).
ASMi-52 allows you to set the loopback timeout causing the RLB to deactivate
automatically after the required period of time.
RLB cannot be initiated from a CPE unit if the CO operates with an external clock,
and is configured to one of the following data rates:
2-wire: 2112 kbps, 2176 kbps, or 2240 kbps
4-wire: 4224 kbps, 4352 kbps, or 4480 kbps
Data
Local ASMi-52 Remote ASMi-52
Data
Clock
Clock
Line
Interface
Line
Interface
Transmit
Receive
Receive
Transmit
Remote
DTE
Local
DTE
Glue
Logic
Glue
Logic
Figure 6-24. Remote Loopback
To activate the remote loopback:
1. From the Diagnostics menu (see Figure 6-22), select Local Test to run the RLB
on the local ASMi-52, or select Remote Test to run the RLB on the remote
ASMi-52 (Main menu > Diagnostics > Local/Remote Test).
The Local/Remote Test menu is displayed (see Figure 6-23).
2. Select RLB.
The RLB value in parenthesis changes to ON. Also, an additional
parameter, Loop Timeout, is displayed for the local ASMi-52.
3. Select Loop Timeout, if you want to set the loopback timeout (in minutes).
The Loop Timeout value changes.
Loop timeout = 0 is forever!
4. Once you selected the loopback timeout, select Save to activate the RLB.
The RLB is initiated. The TST indicators light up on both local and remote
units.
Running Remote Loopback at a Repeater
Remote loopback can also be run at an SHDSL repeater installed in the line. The
RLB is activated from the CO unit only. The RLB checks the repeater’s
performance when it is activated, all preceding repeaters, the local ASMi-52 and
lines connecting them (see Figure 6-25).
Note
Note