Ntbk51Aa Downloadable D-Channel Daughterboard; Removing The Ddch Daughterboard; Installing The Ddch Daughterboard - Nortel Meridian 1 Replacement Manual

NTBK51AA Downloadable D-Channel Daughterboard

Removing the DDCH Daughterboard

Installing the DDCH Daughterboard

Use this procedure to replace the Downloadable D-Channel Daughterboard
(DDCH).
See the X11 Administration (553-3001-311) for a description of all
maintenance commands, and the X11 System Messages Guide
(553-3001-411) for interpreting system messages.
Module covers are not hinged; do not let go of the cover. Lift the cover
away from the module and set it out of your work area.
The static discharge bracelet located inside the cabinet must be worn
before handling circuit cards. Failure to wear the bracelet can result in
damage to the circuit cards.
1 The DDCH can only be removed when it is disabled in software.
2 Both ports of the associated DDP circuit card must be disabled.
3 Disable the faceplate switch on the DDP.
4 Remove the DDP and DDCH.
Note 1: Test procedures require a 24-hour minimum bit error-rate
testing before being used. Refer to the Nortel Networks technical
publication (NTP), ISDN PRI Description and Administration
(553-2901-100) for these procedures.
Note 2: Dual DTI/PRI loops must be configured in software before
defining DCH links.
Replacing equipment
WARNING
WARNING
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Hardware replacement