CopperOptics 150-1342-02 Manuel - Sayfa 11

Ağ Donanımı CopperOptics 150-1342-02 için çevrimiçi göz atın veya pdf Manuel indirin. CopperOptics 150-1342-02 12 sayfaları. 24 channel rt line unit

Sayfayı Yazdır
Indication
POWER LED
1. One or both HDSL lines
off
are no longer connected
between the COT and RT.
Verify the connections at
the RT and COT.
2. The COT Line Unit fuse
F1 has blown.
3. The RT Line Unit power
supply has failed.
4. The COT HDSL power
supply has failed.
LOOP 1 (2)
1. The HDSL line is
SYNC LED
attempting to synchronize
flashing or off
with the central office unit
or cannot detect the
HDSL signal from the
central office unit. This is
usually an indication that
there is a problem with
the HDSL circuit between
the COT and RT
(assuming the FAULT
LED is off).
2. COLU and RTLU
incompatible i.e. one is a
T1 version and the other is
an E1.
LOOP 1 (2)
The HDSL line margin level
MARGIN LED
is below a preset level.
on
FAULT LED on Faulty FRL-742 RT Line
Unit.
TABLE 3. FRL-742 RT LINE UNIT TROUBLESHOOTING
Problem
a. Make the following measurement on the RT Enclosure backplane:
• 130 Vdc to 250 Vdc between HDSL_T and HDSL_T
b. Make the following measurements on the COT Shelf backplane:
• -130 Vdc, ±10%, between HDSL_T1 and Chassis Ground
•
Replace the fuse.
Replace the RT Line Unit.
Replace the COT Line Unit.
a. Verify the HDSL circuits are terminated properly and with the
correct orientation.
b. Measure the loop resistance of each HDSL circuit (shorting the pair
at the far end). The loop resistance must be less than that shown in
Table 1.
See the previous discussion on the SYNC LED flashing or off.
Replace the RT Line Unit.
0 Vdc to +120 Vdc, between HDSL_T2 and Chassis Ground
Section 363-742-102
Action
Revision 01
Page 11