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ASM-40CD Ver. 1.0 Loopback Tests 4-1

Chapter 4

Troubleshooting and

Diagnostics

This chapter discusses:

• Types of loopback tests

• Internal BERT operation

• Setting loopback, BER, and LED tests

• Viewing alarm status

• Viewing alarm buffer messages

• Troubleshooting.

All diagnostics options can be implemented from an ASCII terminal or from an

SNMP management tool. The LLB and REM loopbacks can also be initiated from

the DTE via dedicated pins of the DCE connector. These diagnostic approaches

can also be used in combination. For example, the BERT circuit test pattern can

be run on a path determined by one of the loopback connections and then

examine the alarm buffer messages for any transmission error or configuration

mismatch.

4.1 Loopback Tests

Three loopback connections apply to a transmission system consisting of an

ASM-40CD local module and an ASM-40 remote unit.

• Local analog loopback – The analog transmit signal from the local unit

transmitter is looped back to the local unit receiver. The loopback tests the

local ASM-40CD modem, the local DTE and the connections between them.

The loopback is set from the local DTE via the LLB control line (see

Figure 4-1

• Local digital loopback – The digital receive signal is looped back in the local

ASM-40CD towards the line. The loopback tests the local ASM-40CD, the

remote DTE and the line between them (see

Figure 4-3).

• Remote digital loopback – The digital receive signal is looped back in the

remote ASM-40 towards the line. The loopback tests the local ASM-40CD, the

remote ASM-40 and the line between them. The loopback is set from the

local ASM-40CD or from the local DTE via the RLB control line (see

Figure 4-2)

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RAD Data comm LRS-24 Spezifikationen Seite 37