RAD Data comm ASMi-52 manual Running the Remote Loopback, Running Remote Loopback at a Repeater

Chapter 6 Troubleshooting and Diagnostics Installation and Operation Manual

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.

Note 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

Local

DTE

	Local ASMi-52
Data
Clock	Transmit
	Glue	Line
	Logic	Interface
Data
Clock	Receive

Line

Interface

Remote ASMi-52

Receive

Glue

Logic

Transmit

Remote

DTE

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.

Note 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).

6-22 Testing ASMi-52 ASMi-52 Ver. 2.5