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Chapter 2 - Front & Back Panel Descriptions
2.3
Back Panel
All the cable connections, including one power connection and two signal connections, are made at the back
panel of the DSU. The RS232 connector is used to connect the DSU to an RS232 or V.35 device, and the
LINE connector connects to a DDS or LADS (Local Area Data Set) circuit. The cable connections are shown
in Figure 2-2 and defined in the following sections.
RS232
LINE
POWER
Figure 2-2. Back Panel
2.3.1 POWER Connector
The POWER connector is used to connect the external wall type transformer power supply to the DSU. The
wall transformer plugs directly into an AC outlet.
2.3.2 RS232 Connector
The RS232 (Data) connector is used to connect the DSU to a sync device, such as, multiplexers, routers, or
legacy equipment such as cluster controllers. The RS232 connector is a DB-25 female connector located on
the back panel of the DSU.
The RS232 data connector interface can be switched to a V.35 interface. For the V.35 interface, an internal
data shunt has to be moved from the default RS232 position to the V.35 position. To change the shunt, refer
to the "Shunt" paragraph in this chapter. Also refer to Appendix A for special cabling requirements for the
V.35 mode.
2.3.3 LINE Connector
The LINE connector is used to connect the DSU to a 56K DDS circuit or LADS. This connector is an RJ-48
(keyed) jack on the back panel of the unit.
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