Patton electronic 1082/144 user manual CONNECTING THE MODEL 1082 X.21 SERIAL INTERFACE

designed to connect to DTE equipment, such as a router. However, tail- circuit applications require connection to another DCE equipment, such as a multiplexer (see Figure 7). When connecting the V.35 interface of the Model 1082 to your DCE device, use a V.35 null modem cable. Some applications may also require the installation of a V.35 tail-circuit buffer to account for small differences in clock frequency between the 1082 and the V.35 DCE (Multiplexer).

DSL Span

Model 1082

Model 1082 (DCE)

V.35 Multiplexer (DCE)

Figure 7. Connecting the Model 1082 to V.35 serial DCE

4.3 CONNECTING THE MODEL 1082 (X.21) SERIAL INTERFACE

Model 1082 supports X.21 serial port connections. This section describes how to connect the serial ports to your X.21 equipment.

Connecting the Model 1082 (X.21) to a “DCE” or “DTE” Device

The Model 1082 provides an X.21 interface on a DB-15 female connector. The X.21 interface default configuration is DCE (Data Circuit Terminating Equipment) for connection to DTE (Data Terminal Equipment) such as a router. However, the X.21 interface on the Model 1082 may be configured as DTE (Data Terminal Equipment) for connection to DCE such as a modem or

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