Nortel Communication Server 1000S Installation And Configuration Manual page 189

NT5D12 Dual-port DTI/PRI card installation
Consider the following when configuring the NT5D12 DDP card:
• The system software allows four ports to be defined for the NT6D80
MSDL. The DDCH (NTBK51AA) card has only two ports, 0 and 1;
therefore, ports 2 and 3 must not be defined when using the NTBK51AA.
• Port 0 of the NTBK51AA can only be defined to work with Loop 0 of the
NT5D12 DDP card, and Port 1 of the NTBK51AA can only be defined
to work with Loop 1 of the NT5D12. This relationship must be reflected
when configuring a new DCH in LD 17 (in response to the DCHL
prompt, enter either 0 or 1 when specifying the loop number used by the
DCH).
• You cannot define one of the NT5D12 loops for the NTBK51AA DDCH,
and the other loop for the QPC757 DCHI or the NT6D80 MSDL.
ISDN Primary Rate Interface
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Installation and Configuration