Manuals / Black Box / Computer Equipment / Modem

Black Box MD885A-R3, MD885AE-R2, MD885C-R2, 34336 user manual Problem Solving

Models: MD885C-R2 MD885A-R3 MD885AE-R2 34336

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2.0 Quick Start

2.5 Problem Solving

If you encounter difficulties in setting up or using the modem, try the remedies described below. If you suspect a system malfunction, follow the diagnostic procedures described in Chapter 7. If you cannot resolve the problem, call your supplier.

1.ALL MODES

Make sure all cables are properly connected to the back of the modem.

2. ALL DIAL MODES (HAYES, V.25 BIS, DUMB, BELL 208, AND V.32/208)

DTR (Data Terminal Ready) must be ON if you want to use the modem’s autodial or auto-answer features. (If DTR is ON, the TR indicator is present on the EIA status screen.)

3.ALL ASYNCHRONOUS MODES

The modem’s default DTE speed is 38.4 Kbps in asynchronous mode. If the local DTE does not support this speed, change the modem’s DTE Speed option setting. In Hayes mode, the default DTE speed is automatically overridden when the Modem is autobauded (the Hayes mode AT attention code is sent to the Modem).

4.HAYES MODE

In Hayes mode with default settings in effect, the Modem transmits result codes (messages) to the DTE. In some instances, this may cause undesirable interaction with the attached DTE. If such interaction occurs, use the AT Q2 command to suppress result codes for incoming calls.

5.ALL LEASED-LINE MODES (2-WIRE,4-WIRE,AND V.33)

DTR (Data Terminal Ready) must be ON for the units to train on the leased line. (If DTR is ON, the TR indicator is present on the EIA status screen.)

Four types of compromise equalization are available to compensate for distortion. If the signal quality appears to be inadequate (see Quality Screen in Section 7.6.2), or if the modems are frequently retraining, try changing the equalization option. See Compromise Equalizers in Section 3.3.6.

6.LEASED-LINE (EXCLUDING V.33 OPERATION)

Make sure one modem is set to originate mode and that the other is set to answer mode. (If the correct Quick Setup is selected, and not incorrectly modified, the answer/originate status should be correct.)

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Black Box MD885A-R3, MD885AE-R2, MD885C-R2, 34336 user manual Problem Solving
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MD885C-R2, MD885A-R3, MD885AE-R2, 34336 specifications

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