NTD12 Dual-port DTI/PRI card description and installation Page 151 of 188
ISDN PRI Installation
Installing the DDCH daughterboard
Installation instructions for the DDCH (NTBK51AA) card are the same for
Meridian 1 Options 21/21E, 51/51C, 61/61C, 71, and 81/81C, and Meridian
SL-1 STE, RT, XT, and NT systems.
Set the address for the DDCH (see the switch settings section to set the
address). If a DDCH is present on a DDP card then an external D-Channel
should not be connected to J6. If a DDCH is present the LED “DCH” will
light up.
CAUTION
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.
Procedure 22 - Installing the DDCH card
Step
Action
1
The DDCH can be mounted on any DDP card.
2
Unpack and inspect the DDCH daughterboard.
3
The DDCH comes with four stand-offs so that it can be mounted onto
the DDP. These are easily pushed into 4 corresponding mounting
holes on the DDP.
4
The DDCH is mounted so that it mates correctly with P2 and P3 on the
DDP motherboard.
