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COMSPHERE 3550 Series Data Service Units
2-10 February 1995 3550-A2-GB20-10
Connecting the DSU to a DTE
The DSU’s rear panel has both a 25-pin EIA-232-D/
V.24 connector and a 34-pin CCITT V.35 connector (used
for higher operating speeds). You can use either interface.
When the unit is equipped with a TDM/Flex, either of
these interfaces can be used as Port 1. The TDM/Flex
provides an additional interface to be used as Port 2. This
is a D-type connector. If the port is to operate at a speed
greater than 19.2 kbps, use the V.35 interconnect cable to
provide an interface between the TDM/Flex’s D-type
connector and the DTE cable’s V.35 connector.
Figure 2-7 shows a DSU as well as a DSU equipped
with a TDM/Flex. The DSU without TDM/Flex illustrates
cabling for an EIA-232 application; the DSU with
TDM/Flex illustrates cabling for V.35 applications. Refer
to this figure as you connect your DSU to the data
terminal equipment (DTE). Be sure to select the
appropriate cable, EIA-232 or V.35, for your application.
Procedure
1. Connect the plug end of the DTE cable to Port 1,
either the EIA-232-D or the V.35 connector.
(Figure 2-7 shows Port 1 using the EIA-232-D
connector.)
Tighten the two holding screws.
2. Connect the other end of the cable to the
appropriate port on the computer or DTE.
Tighten any holding screws.
3. If necessary, activate the port to match the
interface, either EIA-232 or V.35 (the default
setting is EIA-232).
Figure 2-7. Installing Cables