CopperOptics PairGain PG-Flex RT FRL-772 List 1 Manual - Página 9

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Indication

POWER

1. One or both HDSL lines

LED 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 powe r

supply has failed.

Indication

LOOP 1

1. The HDSL line is

(2) SYNC

attempting to synchronize

LED

with the central office unit

flashing or

or cannot detect the

off

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

The HDSL line margin level

(2)

is below a preset level.

MARGIN

LED on

FAULT

Faulty FRL-772 RT Line

LED on

Unit.

TABLE 3. FRL-772 RT LINE UNIT TROUBLESHOOTING

Problem

a. Make the following measurement on the RT Enclosure backplane:

b. Make the following measurements on the COT Shelf backplane:

• -130 Vdc, ±10%, between A_HDSL_T1 and Chassis Ground

• 0 Vdc to +120 Vdc, between A_HDSL_T2 and Chassis Ground

(Note: Use B_HDSL_T1 and

B_HDSL_T2 for System #2)

Replace the fuse.

Replace the RT Line Unit.

Replace the COT Line Unit.

Problem

a) Verify the HDSL circuits are terminated properly and with the

b) Measure the loop resistance of each HDSL circuit (shorting the

See the previous discussion on the SYNC LED flashing or off .

Replace the RT Line Unit.

• 130 Vdc to 250 Vdc between A_HDSL_T and B_HDSL_T

correct orientation.

pair at the far end). The loop resistance must be less than that

shown in Table 1.

Section 363-772-100

Action

Revision 01

Page 9