Black Box MD1000C Guide de l'utilisateur télécharger pdf (Page 207)

Hardware Options

Modem 3600 D-3

Part II

This part determines the performance of the local and remote modems

and the telephone circuits. It also determines each modem's ability to

receive a transmitted signal from the other site, properly equalize and

decode the signal and then loop this regenerated signal into the

transmitter for transmission back to the other modem. This test applies

to both leased line and dial line operation.

1) Configure the local modem for REMOTE DIGITAL LOOP

WITH TEST PATTERN. This signals the remote modem to go

into digital loop. The remote modem receives and then

retransmits the data back to the local mode. If the digital bilateral

loop is enabled at the remote, the remote DTE is looped back to

itself.

2) An alternative to the above procedure is to request the operator at

the remote modem to configure his modem for LOCAL

DIGITAL LOOP. Configure the local modem for TEST

PATTERN. The remote modem receives and retransmits the data

back to the local modem.

3) The TEST PATTERN ERRORS display will count received

errors.

4) At the local modem, the indicators should be as follows:

5) To further test the modem and communications link, reverse the

system loopback. First exit the existing loopback test. Reverse

the roles of the local and remote modems and repeat step two.

Note

If the bilateral digital loop is enabled at the local modem, the

DTE interface is looped to itself and permits the DTE to

check the interface circuitry as well as itself.

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Black Box MD1000C Guide de l'utilisateur Page 207