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COMSPHERE 3550 Series Data Service Units
2-10 March 1999 3550-A2-GB20-30
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 ITU-T 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 adapter 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).
V.35 Interface
(Port 1)
EIA-232-D/V.24
Interface (Port 1)
EIA-232
Interface
(Port 2)
DSU with
TDM/FLEX
99-16299
To DTE
EIA-232-D/V.24
Interface
V.35
Interface
Low Voltage
AC Power In
To DTE
DSU
V.35 Adapter
V.35 Cable
Figure 2-7. Installing Cables