User manual

Section 7

TESTING and DIAGNOSTICS

7-1

7.0 TESTING AND DIAGNOSTICS

Dataplex have designed the DPX-213 to provide years of trouble free service. However,

abuse, component failure or external high voltages will damage the unit. All Dataplex

products are subjected to 72 hour burn-in and extensive testing before leaving the factory

to ensure professional quality and reliability.

The DPX-213 uses professional grade components and includes the minimum number of

mechanical components which can degrade with age. There are no customer maintainable

components in the DPX-213.

In the event of a confirmed hardware failure the purchaser must return the modem to a

Dataplex authorised service center, after first obtaining a Return to Manufacturer

Authorisation (RMA) number.

The DPX-213 has facilities for enabling remote and local loops for modem and line

testing.

NOTE: If bit error rate tests are performed with MNP enabled, line errors will be

corrected but a false bit error rate reading will be given. The Constant Speed

Interface allows test equipment to run faster or slower than the line can

accommodate and either data will be lost or flow control characters may appear

as errors during a bit error rate test. Always ensure MNP is disabled and the test

equipment is running at the true line rate when performing any tests.

7.1 Operator Initiated Tests

Operator initiated tests cover local and remote loopback tests. Testing a remote modem

assumes that the local modem is fully CCITT V.22bis compliant or is another DPX-213.

Whenever a local or remote test is in progress, the OH LED will be flashing. Tests

initiated with the AT&Tn commands are:

AT&T0 - Terminate test in progress.

AT&T1 - Initiate Local Analogue Loopback (LALB).

AT&T4 - Enable Remote Digital Loopback (RDLB) response.

AT&T5 - Disable Remote Digital Loopback (RDLB) response.

AT&T6 - Initiate Remote Digital Loopback (RDLB).

Tests AT&T1 and AT&T6 execute until the user enters the AT&T0 command or the power

is disconnected.