Specifications

V.54 Loopback Tests 4-1
Chapter 4
Diagnostics
This chapter contains procedures for performing system diagnostic tests for
ASM-10/8. Use the test procedures provided in this chapter to:
• Verify normal system operation
• Isolate faulty equipment
• Identify other sources of system malfunction.
The tests are activated by control pushbuttons on the ASM-10/8 front panel and
monitored via LED indicators. For description of ASM-10/8 controls and indicators
and their functionality, see Chapter 3.
4.1 V.54 Loopback Tests
ASM-10/8 supports several types of loopback tests for evaluating the operation of
the data system equipment and its line circuits. Using these loopbacks, you can
test communication between the attached equipment, internal circuitry of the
local and remote modems.
Loopback test are best performed in the following order:
1. Local analog loopback
2. Remote digital loopback
3. Local digital loopback.
Before testing the operation of the data system equipment and line circuits, ensure
that all the units are powered up and configured properly.
If you want to run the LLB and RLB tests via the DTE interface pins, ensure that the
PIN 18 and PIN 21 jumpers are set to EN (see Table 2-1 and Figure 2-1).
Note