Nortel DMS-250 - Interpreting DCH States

Service verification 10-13
Digital Switching Systems DMS-250 ISDN Reference Manual MWC14 (CSP14)
Table 10-6
DTCI states and actions
DMS-250
switch states
Actions to be takenResource out of service
CBSY The DTCI is C-side busy From PM level of the MAP terminal:
- post the DTCI
- enter TRNSL C
- diagnose C-side links not in service
SYSB The DTCI is system busy
because of a problem the
system detected
- System log is generated as to fault that
occurred.
- Diagnose the problem.
- System returns the DTCI to service if no fault is
found.
—end—
Interpreting DCH states
Table 10-7 lists DCH states.
Table 10-7
Interpreting DCH states
DCH state
Explanation
In service (INSV) The D-channel is in service.
Manual busy (MANB) Maintenance personnel have manually busied the D-channel to
perform maintenance actions.
Installation busy (INB) The D-channel is installed but has not been put into service thus far.
Peripheral MANB (PMB) Peripheral is taken out of service by operating company personnel.
Initializing (INI) The D-channel is being initialized by the system. The system brings up
the D-channel when the other facilities are brought into service.
Carrier fail (CFL) The carrier on which the D-channel is provisioned failed.
Lock-out (LO) This state indicates a failure at the logical link level or the hardware
(not the carrier).
Remote not responding
(RNR)
This state indicates that CCS7 layer 3 at the far end is not responding
although CCS7 layer 2 is established and ready.
—end—