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COMSPHERE 3500 Series Data Service Units
Model 3511 DSUs
The Model 3511 DSU is designed for installation in a
COMSPHERE 3000 Series Carrier, which supplies
operating power and provides interfaces for connecting to
the digital network. Up to 16 DSUs can be installed in a
COMSPHERE 3000 Series Carrier. For installation of the
carrier, refer to the COMSPHERE 3000 Series Carrier,
Installation Manual.
If installing additional units in a COMSPHERE
3000 Series Carrier that does not contain a fan module,
you may need to install one to dissipate heat. Use
Table 4-1 to determine if fan modules are necessary. This
table lists the fan module cooling requirements if your
carrier consists totally of Model 3511 DSUs. If your
carrier contains a mixture of circuit cards, see the
COMSPHERE 3000 Series Carrier, Installation Manual
for fan module cooling requirements and instructions for
installing the fan module.
Ambient
Temperature
Temperat re
Range
38 — 80 F
(33 — 26.7 C)
80 —112 F
(26.6 — 44.5 C)
4-2
Important Safety Instructions
Read and follow all warning notices and instructions
marked on the DSU or included in this guide.
If you have a standalone Model 3510 DSU, do not
attempt to service it yourself, as removal of the case will
expose you to dangerously high voltage points or other
risks. Refer all servicing to qualified personnel (see the
Equipment Warranty and Support
For additional safety instructions, see the
Safety Instructions
guide.
Table 4-1
Fan Module Cooling Requirements
Number of Fan Modules Required
1 to 5 Carriers
No fan module
1 fan module per carrier
July 1999
section in Chapter 1).
HANDLING PRECAUTIONS
FOR
STATIC-SENSITIVE DEVICES
This product is designed to protect
sensitive components from damage
due to electrostatic discharge (ESD)
during normal operation. When
performing installation procedures,
however, take proper static control
precautions to prevent damage to
equipment. If you are not sure of the
proper static control precautions,
contact your nearest sales or service
representative.
section, Page B at the front of this
6 Carriers
1 fan module (place in second
carrier from top of cabinet)
1 fan module per carrier
Important
3510-A2-GN32-70
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Troubleshooting
