36
2-WIRE IDSL LINE DRIVER RACK CARDS
4.2 Installing the Card into the Chassis
The 2-Wire IDSL Line Driver Rack Card is comprised of a front card and a rear
card. The two cards meet inside the rack chassis and plug into each other via
mating 50-pin card-edge connectors. Use the following steps as a guideline for
installing each Card into the rack chassis:
1. Slide the rear card into the back of the chassis along the metal rails provided.
2. Secure the rear card using the metal screws provided.
3. Slide the front card into the front of the chassis. It should meet the rear card
when it’s almost all the way into the chassis.
4. Push the front card gently into the card-edge receptacle of the rear card. It
should “click” into place.
5. Secure the front card using the thumb screws.
4.3 Wiring the Card
Each of the rear interface cards compatible with the 2-Wire IDSL Line Driver Rack
Cards has one terminal interface port and one 2-wire/4-wire (twisted-pair) port.
For specific interface pinouts, refer to the diagrams in the
Appendix C
of this
manual.
4.3.1 C
ONNECT TO A
DTE D
EVICE
Regardless of the interface module you choose, the Card’s serial port is always
wired as a DCE. It plugs into a DTE such as a terminal, PC, or host. When making
the connection to your DTE device, use a straight-through cable of the shortest
possible length that is appropriate to the interface you are using. When purchasing
or constructing an interface cable, please refer to the pin diagrams in
Appendix C
as a guide.
4.3.2 C
ONNECT TO A
DCE D
EVICE
Since the 2-Wire IDSL Line Driver Rack Card’s serial port is always wired as a DCE,
you must use a null-modem cable when connecting to another DCE device such as
a CSU/DSU, modem, or multiplexor. This cable should be of the shortest possible
length that is appropriate to the interface you are using. When purchasing or
constructing a null-modem interface cable, use the pin diagrams in
Appendix C
as
a guide.
