Nortel DMS-100 Series Maintenance Manual page 27

When the state of a drawer changes, the system updates the status display.
The system can change the state, or the user can change the state manually.
LCM drawer states
Code Definition (abbreviation)
(dot) In service (InSv)
I In-service trouble (ISTb)
M Manual busy (ManB)
O Offline (OffL)
S System busy (SysB)
– Not equipped
Bus interface card
The BIC (NT6X54) is at the front of the line drawer, behind the front
faceplate. The BIC connects to the two LSGs (64 line cards) in the BIC
drawer.
The BIC connects the two 32-channel LSGs to both LCAs. The BIC also
performs the following functions:
scans line circuits for presence of a hook switch change or message
(description of dialed digits)
sends signals through a ringing multiplexer to control the relays in the
power converter to select ringing and ANI/coin voltages
monitors line drawer activity for maintenance
performs digital loop-around on command from the maintenance system
The system accomplishes communication between LCA-0 and LCA-1 or
between two LSGs through the single BIC in each drawer.
Line cards
The line cards are behind the BIC in four rows of a maximum of 16 line
cards. The top two rows of line cards form the odd-numbered LSG, and the
bottom two rows form the even-numbered LSG.
The LCA-1 control complex controls the odd LSG of both LCAs. This
control complex normally uses the ten 32-channel peripheral-side (P-side)
ports available on the DCC of LCA-1 to perform this action.
DMS-100 Family OPAC Maintenance Manual XPM12 and up
Maintenance overview 1-11