Fault Isolation Tests For Ds-1 Link Faults; Summary Of Carrier Maintenance - Nortel DMS-100 Series Maintenance Manual

options. When the user issues the FELP TEST, all 24 DS-1 channels on the
specified link are looped, and the system sends PCM on DS-1 channel 4.
The PCM is looped, and the PCM sent and received are compared.
The user can perform the FELP command on InSv, protection, and BSY
DS-1 links. Protection links must be manually busied before the user issues
the FELP command. The following must have a protection link available:
The protection links must be available to allow the links to be protection
switched during execution of the
where the links attach must be data entered for protection switching.
If a protection link is not available for an InSv, ManB, or SysB link the user
can issue a FELP command. If the user does not issue a FELP command is
not issued the loop back is not enabled.
When PCM samples are looped on DS-1 links, the samples are used to check
the DS-1 link. You can use the samples to check some RCS control cards
for correct operation.
If the A-link fails and cannot be protection switched, a loss of DDL
messaging occurs. A condition that does not allow the A–link to be
protection switched is if protection switching is disabled. The DDL
messaging includes alarm and protection switching messaging. Failure of
the A-link means that a loss of FELP capability occurs for all other DS-1
links on the RCS.

Fault isolation tests for DS-1 link faults

A fault condition detected on DS-1 links, requires maintenance action.
Operating company maintenance personnel use fault isolation tests to
determine which component caused the fault. Operating company
maintenance personnel remove the fault condition or report it to the
appropriate maintenance support organization. When troubleshooting DS-1
links, operating company personnel post the link at the CARRIER level of
the MAP display. Operating company personnel enter the
command to obtain information on the link in question. The following
paragraphs provide methods for handling exact conditions.

Summary of carrier maintenance

Operating company personnel can perform the following operations on DS-1
carrier links at the CARRIER level of the MAP display:
InSv
ManB
SysB.
detail information about an exact carrier
DMS-100 Family SMS Maintenance Manual XPM10 and up
Trouble isolation and correction 9-19
command. This means the RCS
>FELP
>DETAIL