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4.2.2
Terminal Block
Field wiring for radios and dedicated lines connects to the terminal block. It has 8 poles:
Poles 1 and 2 are the transmit pair for 4-wire mode and the transmit/receive for 2-wire mode.
Poles 3 and 4 are the receive pair for 4-wire mode.
Poles 5 and 6 are the radio key output.
Poles 7 and 8 are the radio carrier detect input.
Controller, modem and I/O modules use screw termination style connectors for termination of field
wiring. They accommodate solid or stranded wires from 22 to 12 AWG.
The connectors are removable. This allows module replacement without disturbing the field wiring.
Leave enough slack in the wiring for the connector to be removed.
CAUTION:
Remove power before servicing unit.
To remove the connector:
Pull the connector upward from the board. Apply even pressure to both ends of the connector.
To install the connector:
Line up the pins on the module with the holes in the connector. Make sure all the pins line up
properly.
Push the connector onto the pins. Apply even pressure to both ends on the connector.
Refer to section 4.3-Connecting to Dedicated Lines for wiring diagrams for typical networks. Refer
to section 4.4-Connecting to a Radio for wiring diagrams for common radios.
4.2.3
RJ-45 Modular Jack
Field wiring for telephone lines connects to the RJ-45 modular jack. It mates with an 8 pin modular
plug with at least 4 contacts. This type of connector is common in the telephone industry.
Pins 4 and 5 are the transmit pair for 4-wire mode and the transmit/receive for 2-wire mode.
Pins 3 and 6 are the receive pair for 4-wire mode.
Pins 1, 2, 7 and 8 are not used.
Refer to section 4.3- Connecting to Dedicated Lines for wiring diagrams for typical networks.
4.3
Connecting to Dedicated Lines
The 5902 modem operates in full duplex on four wire networks, or in half duplex on two wire
networks. It uses leased telephone lines or private lines.
4.3.1
Four wire mode
Four wire operation uses one pair of wires for transmitting data and a second pair for receiving data.
The transmitting pair are connected to the +TX and –TX. The receiving pair are connected to the
+RX and –RX terminals.
Figure 4: Four Wire Network shows a typical 4 wire network. Figure 6: Four Wire RJ-45
Connection and Figure 8: Four Wire Terminal Block Connection give wiring details.
5902 Bell 202 Modem Hardware Manual
October 19, 2007
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