Faulty Line Drawer; Faulty Shelf Circuit Pack; Faulty Line Card - Nortel DMS-100 Series Maintenance Manual

7-18 Star Remote System manual maintenance
appropriate maintenance support organization. The following sections list the
procedures involved to isolate and correct faults with specific Star Remote
System components.

Faulty line drawer

Procedure 7-1
To handle a faulty line drawer in the Star Hub
1
2
3

Faulty shelf circuit pack

Procedure 7-2
To handle a faulty shelf circuit pack
1
2
3
4
5

Faulty line card

During line card diagnostics, if a single card fails, the failure causes an entire
Star Hub unit to fail. Finding the single faulty card can be difficult. Usually
only one unit of the Star Hub is affected. There are two procedures that are
useful in identifying the faulty card. Procedures 3 and 4 are described in the
following paragraphs.
Perform this procedure during a maintenance window to avoid possible service
interruptions. Experienced technicians can perform this procedure during the
day if proper precautions are taken.
Procedure 7-3 To identify a faulty line card - method 1
1
2
297-8353-550 Standard 05.01 March 2001
Post, busy, test, and RTS the drawer
If a test or RTS fails with a card list, replace the cards with an appropriate card
replacement procedure, test, and RTS the drawer.
If a test or RTS fails without a card list, perform the appropriate tests that are
indicated by the MAP response and RTS the drawer.
Post the Star Hub.
Determine if there are any fault indicators.
Busy the unit with the faulty card.
Perform the appropriate card replacement procedures.
Test and RTS the Star Hub unit.
Find the vertical connection to the Star Hub in trouble. Use table MTAVERT.
Carefully use a Lineman's test set on the backplane of the MTADRIVER.