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CHAPTER 3: Configuration
3. Configuration
This chapter explains how to configure your standalone or rackmount card line
driver. After you configure it, see Chapter 4 for how to install it, Chapter 5 for how
to operate it, and Chapter 6 for how to test the system.
3.1 Placement of the Standalone Version
Place the 256-kbps Line Driver standalone model within 5 ft. (1.5 m) of a
grounded, easily accessible AC outlet. The outlet should be capable of providing
either 115 VAC (for the ME444A-R3 model) or 230 VAC (for the ME444AE-R3
model).
The line driver is designed to be placed on a tabletop or bench, and is shipped
completely assembled. Allow at least 36" (91.4 cm) of frontal clearance for
operation and access for maintenance. You also need at least 4" (10.2 cm) of
clearance at the rear of the unit for signal lines and interface cables.
3.2 Installing the Card Version in the RackNest 2/14
The RackNest 2/14 is a special 19" rack component designed to host a number of
our short-haul modems and line drivers. It consists of a rack chassis (with one or
two power supplies) into which you can plug as many as 14 modem or driver cards.
The nest’s rear panel consists of fourteen five-screw terminal blocks (“TB1”) and
fourteen connectors (“J1”). Each terminal block (“TB1”) provides four screws for
connecting nest-to-nest G.703 transmit and receive lines—the transmit pair can be
connected to the terminals marked XMT, and the receive pair can be connected to
the terminals marked RCV—plus a fifth screw for ground connection.
Each interface connector (“J1”) is a DB25 female. The pinning of this connector
depends on the type of card installed in the corresponding slot, because the cards
will present and expect different signals on different pins. For the V.35 model of
the line driver card (ME445C-35), the pinning is a special V.35-on-DB25 variant;
for the RS-530 and X.21 models, the pinning is RS-530. Refer to Tables 4-2 through
4-5 (Chapter 4) for the pinouts of this connector, and for the pinning of the
adapters or adapter cables that will be necessary to attach a V.35 or X.21 DTE to
this connector.