Nortel DMS-100 Series Maintenance Manual page 181

message. The ESA CC initially screens the line states of all messages. The
CPC handles all lines in the idle, originate, abandon or lockout states. The
CPC also handles all lines in the state of call processing busy. The CPB of a
line contains the state of the call process. The system processes these lines
based on the call processing state. The CPC ignores all lines in the state of
system busy (SysB) or manual busy (ManB).
Refer to the following figure for an example of the TST.
Figure 6 Terminal status table
Line
5
7 6
0 Error count/cause
640 Error count/cause
The first byte in the TST contains line data that is not protected. The system
divides first byte in the TST as follows:
• Error count/cause: The first four bits contain the count of the errors that
the software of a line detects. Each error increases the count. If the error
counts reach a preset threshold, the system takes the line out of service.
The system records the last cause of the error in place of the error count.
• Line state: The last four bits contain the current state of the line. The line
states are as follows:
— ManB: The line is ManB. The system suspends service to the line.
The system ignores messages from the line. Calls cannot terminate to
this line.
— Idle: The line is equipped. The line is call processing idle and looks
for an off-hook condition. The system treats origination messages
from the line as a call origination, and calls can terminate to this line.
— Originated: The line originates a call, but resources are not available
to service the line. If still off-hook, the line originates the call again
after a 1 s delay. If the system receives an on-hook message before the
timer expires, the system places the line in the abandon state. The line
can originate three times before the system places the line into the
lockout state. Calls cannot terminate to this line.
— Abandon: The line waits for another origination attempt. With any
off-hook or on-hook message, the system places the line into the idle
DMS-100 Family OPM Maintenance Manual ISN07 (TDM)/SN07 (DMS) and up
Byte 1
4 2 1
3 0
Line state
Line state
ESA maintenance overview 4-13
Byte 0
5 4
7 6 3
CPB index/origination count
CPB index/origination count
2 1
0