Nortel DMS-100 Series Maintenance Manual page 84

2-8 Functional overview
Example of a MAP response:
DRWR:
When the state of a drawer changes, the system updates the state display. The
system or the user can change the drawer state.
Table 1 LCM drawer states
Code
• (dot)
I
M
O
S
-
Bus interface card (BIC)
The BIC (NT6X54) is at the front of the line drawer behind the front faceplate.
The BIC connects to the two 32-channel LSGs (64 line cards) in the drawer
where the BIC is installed. The BIC connects the two 32-channel LSGs to both
LCAs. The BIC performs the following functions:
•
•
•
•
Communication between LCA-0 and LCA-1, or between two LSGs, occurs
through the single BIC in each drawer.
Line cards
The line cards are behind the BIC in 4 rows of a maximum of 16 line cards.
The top two rows of line cards form the odd-numbered LSG. The bottom two
rows form the even-numbered LSG. Normally, the LCA-1 control complex
controls the odd LSG of both arrays. Normally, the LCA-0 control complex
controls the even LSGs of both arrays. The LCA-0 and the LCA-1 use the ten
297-8361-550 Standard 04.02 December 2004
01 23 45
.. S. ..
Scans line circuits for a hook switch change or a message that describes
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 looparound on command from the maintenance system
11 11
67 89 01 23
MM .M OO ..
Definition (abbreviation)
In service (InSv)
In-service trouble (ISTb)
Manual busy (ManB)
Offline (OffL)
System busy (SysB)
Unequipped
11 11 11
45 67 89
-- SS I.