TAD-100
: Trouble Clearing 363-206-305
Page 4 of 6 Issue 3, June 2000
DDM-2000 F
IBER
R
EACH
N
ARROWBAND
S
HELF
• A misplaced
SLC
-2000 Server should always cause the
CONFIG
indicator to
light if the CP placement/setting is in conflict with the
SLC
-2000 Server
installation rules (only when inserted in shelf set for metallic).
• If the
FAIL
LED stays on following the replacement of a common unit, the CP is
probably failed, is installed in the wrong position, contains incorrectly set options,
or another circuit pack/wiring trouble may cause the trouble.
The following procedure may be used when a problem is indicated (as above)
following replacement of a unit. A simple verification of craft personnel error may be
made as follows: While observing the
FAIL
LED on the unit just replaced, depress
the
DSXBIU LED TEST
switch or the UIP
LED TEST
switch (
SLC
-2000 Access
System). If the
FAIL
LED on the replaced CP does not light, a craftsperson error of
the type listed above is indicated.
!
CAUTION:
An electrostatic discharge wrist strap, with a minimum resistance of 250K ohms,
should be worn and connected to a suitable ground when handling circuit packs
to prevent possible damage to the circuit packs. Before using the wrist strap,
check it for opens, shorts, and minimum resistance value. If the strap does not
pass these checks it should not be used. To avoid possible personal injury while
using the wrist strap, do not connect it to the power shelf or adjacent portions of
the RT frame. The RT fan unit has an ESD GRD jack for wrist strap connection.
CUSTOMER TROUBLE REPORTS
A customer trouble report is generally an unalarmed trouble and usually indicates a
channel unit problem or distribution facility problem.
Single-party, multiparty, and test service trouble reports are first received at the repair
service bureau (RSB). The RSB uses MLT to test the circuit if it is available. The
result of the MLT is a DC signature that indicates the status of the NBS and drop pair
health using the
SLC
-2000 Server at the RT and the channel and drop test unit
(
CDTU
) at the NBS. The pair gain test controller (
PGTC
), extended test controller
(
XTC
)
PGTC
emulation mode, or test bus control unit (
TBCU
) can test the NBS
channel unit and report its results to the MLT system. If the MLT test result reports a
problem, a trouble report is initiated to the proper repair force and trouble analysis
procedures begin at the RT or NBS depending on the result. If the MLT test result
finds no trouble with the NBS system, a replacement of the
COT
channel unit (if
universal) is performed first. Then if the trouble is still present, a replacement of the
RT/NBS channel unit is made.
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