Nortel DMS-100 Series Maintenance Manual page 96

1-80 Maintenance overview
Scenario 10
All DS-1 links, which includes the protection link, are in-service. Faults are
not present on any link.
Scenario 11
All DS-1 links, which includes the protection link, are in-service. Faults are
not present on any link.
Scenario 12
All DS-1 links, which includes the protection link, are in-service. Faults are
not present on any link.
297-8231-550 Standard 09.01 August 1998
The transmit receive unit card of the RCS C-shelf is removed.
The SMS detects a fault (frame loss) on the C-link. Removal of the
transmit receive unit card causes frame loss on the RCS transmit side of
the DS-1 link.
The protection link is switched for the C-link.
The SMS detects a fault (frame loss) on the protection link because the
transmit receive unit card is removed,.
The protection link is system busied.
The C-link is system busied.
The protection link is not released because no fault is present with any
part of the protection link. This scenario also applies for B- and D-shelf
transmit receive units.
The C-shelf link is broken.
The SMS and RCS detect frame loss on the C-link.
The protection link is switched for the C-link.
The protection link is broken.
The SMS detects a fault on the protection link.
The protection link is system busied.
The C-link is system busied.
The protection link is released from the C-link because a fault is present
with the protection link facility.
The A-shelf transmit receive unit card is removed.
The SMS detects a fault (frame loss) on the A-link and the protection
link.
The protection link is system busied.