Installing The Ddch Daughterboard - Nortel Meridian 1 Hardware Replacement Manual

3 Disable the faceplate switch on the DDP.
4 Remove the DDP and DDCH.

Installing the DDCH Daughterboard

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.
Set the address for the DDCH; refer to Table 4 on page 213 for DCH mode
and address select switch settings. If a DDCH is present on a DDP card then
an external D-Channel should NOT be connected to JC. If a DDCH is present,
the LED "DCH" will light up.
Table 4
DCH mode and address select switch settings
Switch
1-4
5-7
8
1 The DDCH can be mounted on any DDP card.
2 Unpack and inspect the DDCH daughterboard.
3 Push the four stand-offs on the DDCH daughterboard into the four
corresponding mounting holes on the DDP.
Note: The DDCH daughterboard mounts to mate correctly with P2
and P3 on the DDP motherboard.
Replacing equipment
Description
D-Channel Daughterboard
Address
For future use
External DCH or Onboard
DDCH
Page 213 of 250
S3 switch setting
See Table 5 on page 214.
off
off - MSDL or DCHI card
on - Onboard DDCH
Daughterboard
Hardware Replacement