Modem 34336

For dialup applications:

Use the supplied two-conductor crossover cable to connect the Modem to the telephone-line modular wall jack. Plug the eight-pin connector (RJ-45) of the cable into the rear-panel jack labeled TX DIAL. Then, plug the six-pin connector (RJ-12) into the telephone jack.

NOTE

Do not bundle the telephone and RS-232 cables together.

Optional: For manual-dial operation, or if you want to use the telephone line for voice transmissions (when the Modem is not operating in data mode), connect a standard telephone into the rear-panel jack labeled

PHONE.

For leased-line applications:

Use the supplied four-conductor cable to connect the Modem to your leased-line modular wall jack. Attach the six-pin modular connector (RJ-12) to the rear-panel jack labeled LEASED LINE. Attach the eight-pin connecter (RJ-45) of the cable into the line’s terminal block.

The same cable is used whether you have a 4-wire or 2-wire leased line. In a 4-wire application, the green and red wires are the TRANSMIT pair, and the yellow and black wires are the RECEIVE pair. When the cable is connected to a 2-wire line, only the green and red wires are used.

NOTE

Do not bundle the telephone and RS-232 cables together.

2.1.5JUMPERS

For most applications, you will not need to reset internal jumpers. However, jumpers must be reset for the following situations:

If you are connecting frame ground to signal ground.

If you are switching from A/A1 control to MI/MIC control.

Change the function of TIA/EIA pin 25 (the default is test mode indicator).

If you use the Modem in a DC rack enclosure.

For detailed jumper information, see Appendix D.

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Black Box 34336, MD885AE-R2, MD885C-R2, MD885A-R3 user manual For dialup applications, For leased-line applications

MD885C-R2, MD885A-R3, MD885AE-R2, 34336 specifications

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