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Compact modem unit (CMU)
Fiber SFP interface
The Fiber SFP interface is a standard small form-factor pluggable (SFP) gigabit
interface that allows connection of an optional fiber-optic module. When a
supported SFP module is present, the customer traffic network (and in-band
management network, if enabled) connects through fiber, and the copper data port
is disabled.
The Fiber SFP interface is a Class 1 laser product, safe under all conditions of
normal operation.
For more information on the Ethernet interfaces see
36.
Power connector
The CMU is powered from a standard –48 V dc telecommunications supply, with
supply range –40.5 V to –60 V.
The 0 V (positive connection) is grounded at the CMU casing, IF cable outer shield
and ODU casing.
Ground stud
The CMU must be grounded at this M5 ground stud using the supplied connector.
The ground cable must be fitted to a suitable low impedance ground point. This will
ensure protection to personnel from hazardous voltages occurring in the event of
lightning strikes and for the protection of the equipment.
1-8
Chapter 1 Product description
Wireless operation
on page
phn-1478_005v000
4-
Apr 2010
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