SWAN Concentrator Installation and Support Guide

Cable Specifications
SWAN Concentrator Installation and Support Guide—429391-006
B-15
WAN Interface Converter Cable Wiring
Figure B-9 shows how the four electrical interfaces are enabled and disabled as
needed depending on which interface converter cable is connected. The diagram is
somewhat simplified in that many of the drivers and receivers are shared across the
different electrical interfaces where possible. For example, RS-232 and V.35 have
identical signals for the modem control lines, such as the request to send (RTS) signal,
so the same RTS driver is used for both RS-232 and V.35. X.21 adds no extra drivers
or receivers but uses only a subset of the RS-449 drivers and receivers.
Figure B-9. Driver and Receiver Multiplexer and Selection Circuitry
RX Signals to
Power QUICC
VST849.vsd
TX Signals From
Power QUICC
V35
X21
449
232
V35
X21
449
232
50-Pin WAN
Connector
Interface
Decode
PAL
Interface
Select
From Interface
Converter Cable