Verification Procedures And Maintenance; Verification Test Routines; Loop Check - Northern Telecom M5212 ACD General Description, Installation And Maintenance

Verification procedures and
maintenance
The verification test routines detailed in this section are primarily
acceptance tests.
Maintenance
Maintenance in the field should be limited to replacing the handset, handset
cord, headset, power supply (transformer), or the entire unit. Mean time to
repair should not exceed 15 minutes for a single technician.

Verification test routines

There are criteria outlined in NTP 297-2011-180, Business Set Line
Engineering, that if observed, will make impulse noise, background noise,
and crosstalk compatibility unlikely. A loop check should be performed
prior to installing the M5212 ACD set. Installation includes verification that
on power up, the set displays set type, firmware version, and no RAM or
ROM failures. Following installation, the Tip/Ring polarity should be
checked before attempting to establish a communication path to another
telephone and before going through the different call routines (enabled
features) while observing and verifying the responses of the set. The Station
Ringer Test can be used to verify Key/LCD indicators. Refer to Procedure
5-3 on page 5-3 for details.

Loop check

Loop and linecard tests are performed at the switching equipment in the
Central Office (CO), and should have been completed before installing any
M5212 ACD sets.
M5212 ACD Set General Description, Installation, and Maintenance BCS33 and up
CAUTION
No user serviceable parts inside set.
There are no user serviceable parts inside the M5212 set. If
maintenance beyond replacing the handset, handset cord,
headset, or power supply (transformer), is required, the set
must be returned to Northern Telecom for repairs, including
fuse replacement.
5-1