Nortel DMS-100 Series Maintenance Manual page 142

5-6 ESA maintenance overview
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The ESA line-audit process returns the line to service.
The second byte in the TST contains the CPB index/origination count. A CPB
is the data base that associates with an active call process. An adequate
number of CPBs are available to handle the maximum number of intra- and
interswitched calls. The number of ESA calls the system supports is less than
the number of lines the system supports. This state results in not enough
available CPBs for the available channels.
297-8353-550 Standard 05.01 March 2001
reaches a preset threshold, the system takes the line out of service. The last
cause of the error is recorded in place of the error count.
Line state - The last four bits contain the current state of the line. The line
states are:
— ManB - The line is manually busy. Service is interrupted 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. The line
looks for an off-hook condition. Origination messages from the line
are treated 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 the line remains off-hook, the line originates the
call again after a 1 s delay. If an on-hook message is received before
the 1 s timer expires, the line goes to the abandon state. The line can
originate again three times before the line goes to the lockout state.
Calls cannot terminate to this line.
— Abandon - The line waits for another origination attempt. Off-hook or
on-hook messages put the line in the idle state. When in the idle state,
idle scan for an off-hook condition starts. Calls cannot terminate to this
line.
— Call processing busy - The line is in a call processing busy state. In this
state, a CPB associates with the line. The associated CPB index is in
the second byte of the TST. The system controls messages the line
generates to the related CPB index. Calls cannot terminate to this line.
— Lockout - The line is not involved with an active call. A CPB does not
associate with the line, but the line is monitored for an on-hook
condition. An on-hook message causes the line to return to an idle
state. When in the idle state, the idle scan for an off-hook condition
starts. Calls cannot terminate to this line.
— SysB - The ESA CC system-busies the line because it detects too many
errors. The line is removed from service. The last cause of the error is
stored in the error count/cause byte of the TST. The system ignores
messages from the line.