Nortel DMS-100 Series Maintenance Manual page 93

Under normal conditions, when the LCC and the LCA are active, LCC-0
connects LCA-0 and LCC-1 connects LCA-1. LCC-0 serves even numbered
DS-1 links from the DS-1 interface cards. LCC-1 serves odd numbered DS-1
links. The even numbered links are 0, 2 and 4. The odd numbered links are 1,
3 and 5. The configuration of LCCs in the OPM appears in the following
figure.
One-to-one mapping of LCA primary ports with DS-1 links can occur. This
event means that all 24 channels of a DS-1 link exit from one 32-channel
DS30A port. Additional channels are for control and signaling, from the host,
and for intraspeech and interspeech channels.
The LCC accepts eight DS30A links from the LCA. This event appears in
figure "OPM link port and channel structure". Through the LCC, these links
provide the following:
• message and speech paths to the host
• connection to the RMM
• link-sharing resources for each LCA
DMS-100 Family OPM Maintenance Manual ISN07 (TDM)/SN07 (DMS) and up
Functional overview 2-17