Nortel DMS-100 Series Maintenance Manual page 46

1-34 Maintenance overview
At the LCM level of the MAP display, the status of the drawers is displayed
below the status of the LCM units. The drawers are numbered from 0
through 19 and grouped in pairs to show that they share the same BIC card
and, normally, interface a different processor (odd or even). The following
display shows an example of drawer status:
DRWR:
When a drawer state changes, the status display is updated. The state can be
changed by the system or manually.
LCM drawer states
Code
I
M
O
S
–
Bus interface card
The Bus Interface Card (BIC) (NT6X54) is located at the front of the line
drawer, behind the front faceplate. The BIC connects to the two LSGs (64
line cards) in the drawer where it is installed. In addition to connecting its
two 32-channel LSGs to both LCAs, the BIC performs the following
functions:
Communication between LCA-0 and LCA-1, or between two LSGs, is
accomplished through the single BIC in each drawer.
297-8381-550 Standard 02.02 April 1999
01 23 45
.. S. ..
(dot)
scans line circuits for presence of a hook switch change or message
(interpretation 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 looparound on command from the maintenance system
11 11 11
67 89 01 23 45
MM .M OO .. --
Definition (abbreviation)
In service (InSv)
In-service trouble (ISTb)
Manual busy (ManB)
Offline (OffL)
System busy (SysB)
Unequipped
11 11
67 89
SS I.