Nortel DMS-100 Series Maintenance Manual page 39

Maintenance overview 1-23
DS-1 interface cards
The DS-1 interface cards (NT6X50) are in slots 19 and 20 of the HIE shelf.
An additional card can be provisioned in slot 21 in place of the filler panel.
Each DS-1 interface card accepts two DS-1 links from the host office
LGC/LTC. Each DS-1 interface card connects the two DS-1 links to the
LCC on a maximum of six links.
The system requires a minimum of two DS-1 cards for the two primary
message channels from the LCM. The system carries these two message
channels on different cards for reliability.
The addition of an optional third DS-1 card only occurs in the following
condition. The system must require DS-1 links to handle the traffic load of
the OPAC.
The DS-1 ports are not duplicated. Each processor in the LCA shelves of
the OPAC can control all six DS-1 ports.
Primary ports that map one-to-one with DS-1 links are equipped ports. The
number of equipped ports in an LCA depends on the number of DS-1
interface cards provisioned in the HIE.
If three DS-1 cards are provisioned, all three primary ports (0, 1, and 2) for
each LCA are equipped. If a port is not equipped, the system does not use
the port. The system can use the port for features that additional OPAC
feature packages contain.
The figure on page 1-24 shows the OPAC link, port, and channel structure.
DMS-100 Family OPAC Maintenance Manual XPM12 and up