CopperOptics PairGain HiGain-2 HRU-612 Handbuch - Seite 11

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Step

Depress the loopback LB button on the HRU front panel for at least 5 seconds.

Verify that the GREEN HRU front panel loopback LB NET LED turns on, indicating that the HRU is in its

digital (NREM) loopback state. Also verify, if possible, that the HLU displays the message "NREM" also

indicating that the HRU is in loopback (see Figure 5).

Have the C.O. tester transmit a T1 test signal into the HLU and measure that the returned (looped) signal

is error free.

If the above test fails, remove the HRU from its loopback state by again depressing the HRU loopback

button for 5 seconds. Verify that the loopback NET LED is off.

Have the C.O. tester send the HLU (4 in 7) in-band loop-up (NLOC) for 5 seconds. Verify that the HLU

displays the message " NLOC" indicating that the HLU unit is in its network loopback state.

Repeat step 3. If the test passes, the problem is in the cable pair or the HRU. If it fails, the problem is in

the C.O.

To verify that the proper ports are use for the VHDSL & DS1 pairs, use an ohm-meter to verify that the

VHDSL HRU-612 port has a 180 k T to R resistive signature in contrast to the DS1 ports which have a 15

ohm T to R resistive signature.

If the CPE 60 mA. switch option is set. Verify that the external NID is under power and that the voltage

across the HRU-612's front panel "60 mA MON" test points measures between 55 and 65 mv. This

indicates that the CPE current is between 55 & 65 mA. Note that the external NID's LOOP POWER

option must be set to its "THRU" position when powered by the HRU.

NOTE: When T1 loopback tests are made on the HiGain-2 system with external metallic loopback connections

at either end, the DS1 code that exists at the metallic loopback interface may be different from the DS1 code

being received at the opposite end when the DS1 user option is set to AUTO. For example, if the HRU has a

metallic loopback and the HLU's receive pattern's code is changed from AMI to B8ZS and then the all 0 pattern is

sent into the HLU, the HRU remains in its AMI mode and thus loops all 0's. This causes the HRU to indicate a

LOS condition which then causes the HLU to output the AIS pattern.

12. TESTING

12.01

Table 2 provides a step by step test

procedure for the HRU-612 unit. This

procedure allows verification of the integrity of the

VHDSL channel to the HLU Line Hit as well as the

DS1 channels to the customer and the HLU DSX-1

interface. Table 3 lists the HLU status messages

which may also be helpful when coordinating turn-up

with CO personnel.

TABLE 2. HRU-612 Test Procedures.

Action

12.02

The HLU's 4 character front panel has many

useful diagnostic messages. They are listed

in Table 3.

12.03

If trouble is encountered at the T1 interface,

verify that the unit is making a positive

connection with the mounting assembly's connector.

Section 150-612-100

Revision 02

Page 11