Chapter 7

Test Mode Operation

Diagnostic tests are used to isolate faults in the communications path. Diagnostic tests terminate after the period of time specified by S18. If S18 is set to 0, the timer is disabled and tests will run continuously. Tests may also be terminated by the &T command. When in test modes without a test pattern, issue the escape sequence +++ to return to command mode before terminating the test with the &T command.

Note

Local analog loopback with or without a test pattern is the only test available in protocol mode.

Test Categories

Diagnostic tests fall into two categories: those that can be performed online or offline and those that must be performed online. Refer to Table 7-1.

Table 7-1. Diagnostic Tests

Test

Offline

Online

Local Analog Loopback (LAL)

X

X

 

 

 

Local Analog Loopback with Self Test (LAL/TP )

X

X

 

 

 

Local Digital Loopback (LDL)

 

X

 

 

 

Remote Digital Loopback (RDL)

 

X

 

 

 

Remote Digital Loopback with Self Test (RDL/TP)

 

X

 

 

 

Test Pattern (TP)

 

X

 

 

 

Note

These tests do not apply to fax mode and should only be performed when the modem is configured for data operation.

V.3600

7-1

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Motorola V.3600 manual Chapter Test Mode Operation, Test Categories, Test Offline Online