Black Box 34336 User Manual

• 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.  

• 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.

• 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.

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.