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Fault Isolation
F
I
AULT
SOLATION
The following sections detail the fault isolation procedures. For sections that indicate a condition such as "distance
limitation exceeded," refer to the section "Specifications" on page 2 for the correct values.
DICOLU
RT F
AND
At the CO, you can use the Craft interface to initiate a SDT to determine the cause of any of the following
problems. The SDT test performs Hazardous Potential, Foreign Voltage, Resistive Faults, Receiver Off-hook, and
Ringers Tests. At the customer site, the following sections provide procedures for isolating faults indicated by the
COLU LEDs.
LED
Color
PWR
Green
On, all other LEDs
flashing
On, all other LEDs
running downward
On, all other LEDs
running upward
On FAULT flashing
On
Flashing
Off
SYNC
Green
On
Flashing
Off
MARGIN Yellow On
Flashing
Off
TEST
Yellow On
60
I
AULT
NDICATORS
State
Probable Cause
Application program in PLL-735 has
become corrupt.
OK
OK
The PLL-735 detects the RT but the
HDSL loop is drawing too much power
or has a ground fault.
OK
The PLL-735 detects the RT but the
HDSL loop cannot synchronize.
No battery feed to COT shelf.
OK
The PLL-735 detects the RT but the
HDSL loop cannot synchronize.
The PLL-735 does not detect an RT.
The HDSL signal level is too low coming
into the PLL-735.
The HDSL signal level is too low coming
into the RT.
OK
January 6, 2003
SCP-PLL735-010-03H
Solution
Download new software into the PLL-735.
Wait for software to be downloaded and
PLL-735 has re-started.
Wait for software to be downloaded and
PLL-735 has re-started.
Check the HDSL loop for shorts or
grounds.
Check the HDSL loop for faults such as
shorts, grounds or bridged taps.
Verify loop length limitations are not
exceeded.
Verify fuses in equipment bay fuse panel.
Verify CO battery is present on COT shelf
backplane.
Check the HDSL loop for faults such as
shorts, grounds or bridged taps.
Verify loop length and loop loss limitations
are not exceeded.
Verify an RT is connected to the HDSL
loop.
Check the HDSL loop for faults such as
opens, grounds, load coils or bridged taps.
Verify loop length and loop loss limitations
are not exceeded.
Check the HDSL loop for faults such as
shorts, grounds or bridged taps.
Verify loop length and loop loss limitations
are not exceeded.
Check the HDSL loop for faults such as
shorts, grounds or bridged taps.
Verify loop length and loop loss limitations
are not exceeded.
Wait for subscriber drop test to complete.
PLL-735 Lists 1, 2 and 3
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