Specifications

Chapter 6 Troubleshooting and Diagnostics ASMi-52L Installation and Operation Manual
6-12 Testing ASMi-52L
6.5 Testing ASMi-52L
The user-controlled test functions of ASMi-52L consists of the loopback tests and
LEDs test. The purpose of these tests is to determine the source of a break in the
data flow.
• Loopbacks are supported in X.21 and V.35 versions only.
• Both local and remote ASMi-52L units must be configured and synchronized
properly to allow remote loopback activation.
• Only one loopback can be activated at a time, either on the local or remote
unit.
Running Loopback Tests
ASMi-52L supports the local and remote loopbacks as per ITU V.54, by using the
following methods:
• From the supervisory terminal.
• Via corresponding pins of the synchronous interface, for the ASMi-52L with
V.35 interfaces only.
Running the Local Loopback
The local loopback (LLB) checks the performance of the local ASMi-52L modem,
the local DTE and connection between them (see Figure 6-11). The LLB can be
performed separately on the local and remote modems.
ASMi-52L allows you to set the loopback timeout causing the LLB to deactivate
automatically after the desired period of time.
Timeout set to 0 (zero) is forever. Avoid setting timeout to 0 as local control is lost
during LLB
Local
DTE
Data
Local ASMi-52
Data
Clock
Clock
Line
Interface
Glue
Logic
Transmit
Receive
Figure 6-11. Local Loopback
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To run the local loopback:
1. From the Main menu, select Diagnostics.
Note
Note