Nortel DMS-100 Series Maintenance Manual page 52

1-40 Maintenance overview
LCC interface to DS-1 interface cards
Under normal conditions, when both are active, LCC-0 connects LCA-0,
and LCC-1 connects LCA-1. LCC-0 serves even numbered DS-1 links
(0, 2, and 4) from the DS-1 interface cards, and LCC-1 serves odd numbered
DS-1 links (1, 3, and 5). The following figure shows how the LCCs are
configured in the RLCM-EDC.
One-to-one mapping of LCA primary ports with DS-1 links means that all
24 channels of a DS-1 link come out of one 32-channel DS30A port. Extra
channels are used for control and signaling, from the host, and for intra- and
interswitch channels.
The following figure, "RLCM-EDC link, port and channel structure," shows
that the LCC accepts eight DS30A links from its LCA. Through the LCC,
these links provide
297-8381-550 Standard 02.02 April 1999
DS-1 links 0
DS-1
interface
card
DS30A links
LCA-0
message and speech paths to the host
connection to the RMM
link-sharing resources for each LCA
To host office
2 4
DS-1
interface
card
I/S
LCC-0 LCC-1
RMM
5 1 3
DS-1
interface
card
I/S: intershelf link
DS30A links
LCA-1