Nortel Modular ICS 7.1, Инструкция по установке

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N0130943 02 Modular ICS 7.1 Installer Guide
Troubleshooting
These troubleshooting procedures allow you to solve many
problems in the Norstar system.
Follow these procedures before replacing any components.
Where more than one procedure is given, the procedures
represent different options from which you can select one.
Only qualified persons should service the system.
The installation and service of this unit is to be
performed only by service personnel having appropriate
training and experience necessary to be aware of
hazards to which they are exposed in performing a task
and of measures to minimize the danger to themselves
or other persons.
Electrical shock hazards from the telecommunication
network and AC mains are possible with this equipment.
To minimize risk to service personnel and users, the
ICS must be connected to an outlet with a third-wire
ground. In addition, all unused slots should have filler
faceplates installed and the doors should be in place at
the completion of any servicing.
Service personnel must be alert to the possibility of high
leakage currents becoming available on metal system
surfaces during power line fault events near network
lines. A risk point on the ICS is the power cord earth
ground pin. These leakage currents normally safely flow
to Protective Earth ground via the power cord.
Therefore, it is mandatory that connection to an
grounded outlet is performed first and removed last
when cabling to the unit. Specifically, operations
requiring the unit to be powered down must have
the network connections (central office lines)
removed first.