2-1
3550-A2-GB20-40
July 1999
Installing the Model 3550 DSU
Overview
2-1
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Before You Begin
2-1
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How to Change Hardware Straps
2-2
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Where to Place the DSU
2-4
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Installing the DSU
2-4
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Power-Up Routine
2-5
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Connecting to the Network
2-5
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Connecting to the NMS
2-6
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Connecting to the Dial (or PSTN) Network
2-6
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Connecting to the DDS (or LADS) Network
2-7
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Addressing the Unit
2-8
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Tributary DSU Addressing
2-9
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Connecting the DSU to a DTE
2-10
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Connecting Port 2
2-11
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Verifying Operation and Testing Connections
2-11
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Verifying Network Addresses
2-11
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Verifying the Network
2-11
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Verifying DBM Operation
2-12
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Verifying TDM/Flex Operation
2-12
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Other Tests
2-12
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Overview
The Model 3550 DSU is designed for desktop
operation and is delivered ready to connect to the
network. It is configured as a tributary DSU for operation
at 9.6 kbps on a multipoint circuit.
If the unit was ordered with a TDM/Flex installed,
Ports 1 and 2 are configured for 9.6 kbps operation, and
configured as a digital sharing device (DSD). Both ports
are configured for EIA-232 operation, rather than V.35
operation. Refer to the MUX (Port) option set tables in
Chapter 5 to change this configuration on a port-by-port
basis.
Installation consists of the following steps, which
should be performed in the order listed.
•
Physical installation
•
Hardware straps
•
Electrical connection
•
Network diagnostic connection
•
Software configuration
•
DDS network (or LADS) connection
•
Dial (or PSTN) network connection if a DBM is
installed, or if using an external dial backup unit
(DBU)
•
DSU DTE connection
•
Verification testing
Although the Model 3550 DSU is designed for desk or
table-top operation, you can order an ACCULINK
r
3100 Series CSU wall-mount adapter if you want to
mount the DSU on a wall, an equipment shelf, a 19-inch
RS-310-C or 23-inch AT&T DATAPHONE
r
equipment
cabinet. Refer to
Appendix F
to order the adapter.
Before You Begin
Your installation site should be clean, well-lighted,
well-ventilated, and free from environmental extremes.
A dedicated grounded ac outlet that is protected by a
circuit breaker should be installed within 6 feet of the
DSU’s planned location. The outlet should be capable of
supplying 90 to 132 Vac 60 Hz (U.S. and Canada). The
circuit must be capable of supplying a minimum of
2 amperes at 115 Vac. Refer to the
Technical
2
Summary of Contents for COMSPHERE 3550 Series
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