3.2.2 Interface Power Option (Model 2400/C)
One jumper strap (JP1) is used to set the Model 2400/C to
receive its power from the V.35 interface. Figure 8 shows the position
of JP1 on the bottom top of the Model 2400/C PC board.
Figure 9, below, shows the orientation of the pins on the six pin
jumper block and possible settings of jumper straps JP1 and JP2.
JP1: DC Power Supplied by Pin KK
The Model 2400/C may be configured to receive its operating
power from pin KK on the V.35 interface. In the normal setting, pin KK
is not used for interface power.
JP1
Position 1&2
Interface Power Option. In this setting the
2400/A Series unit is powered from the DTE
interface. Powered should be applied to pin 9
at +5VDC (±5%), 200mA. The AC wall-
mount transformer must not be connected
in this setting.
Position 3&4
Normal
4.0 INSTALLATION
The Model 2400 is designed for 4-wire, full duplex communication
over a DDS or Clear Channel carrier circuit, or over dedicated twisted
pair. This section will describe proper connection of the line interface,
the DTE (terminal) interface, and the AC power supply.
4.1 LINE (NETWORK) CONNECTION
The RJ-48S port on a Model 2400 CSU/DSU is prewired for a
standard TELCO wiring environment as in Figure 4, below. Connect this
port to the RJ-48S jack provided by your digital service carrier using a
straight through twisted pair cable between 19 and 26 AWG. To be
sure you have the right wiring, use Figure 10, below, as a guide.
4.1.1 CONNECTING OVER PRIVATE TWISTED PAIR
If you are using a pair of Model 2400s as short range modems over
private twisted pair, make the connection between them using a twisted
pair crossover cable pinned according to Figure 11, below.
RJ-48S Cable (4-Wire)
SIGNAL
PIN#
PIN#
SIGNAL
TX+
1-----------------------7
RX+
TX-
2-----------------------8
RX-
RX+
7-----------------------1
TX+
RX-
8-----------------------2
TX
11
12
Figure 11. RJ-48S Cable Signal and Pin Numbers for the Model 2400
1 (TX+)
2 (TX-)
3 (N/C)
4 (N/C)
5 (N/C)
6 (N/C)
7 (RX+)
8 (RX-)
1
2
3
4
5
6
7
8
Figure 10. Prewired TELCO Wiring on the RJ-48S Port on Patton Model 2400
Figure 8 Position of the DIP Switches on the 2400/C PC board
Jumper JP1
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Figure 9. Possible Settings of Jumper Strap JP1 for Model 2400/C
1
2
3
4
JP1
Pin 1
Oriented at
top left of
jumper
block
