CopperOptics 150-1103-81, Manual, Page: 22 / 42

Revision 01 March 31, 1998 150-412-181-01
16 PairGain Engineering - Plant Series HRU-412 List 8A
To install the HRU-412 List 8A:
1 Ensure that the shelf is correctly mounted and wired (refer to the shelf’s
technical practice for additonal information).
2 Slide the HRU-412 List 8A into the card guides for the desired slot, then
push the unit back until it touches the backplane card-edge connectors.
3 Place your thumbs on the HRU-412 List 8A front panel and push the
HRU-412 List 8A into the card-edge connector until it is secured in the
card guides.
Installation Test
Perform the following procedure to test the HRU-412 List 8A.
1 Press the loopback button (see Figure 2 for the location of this button) for
at least five seconds.
Verify that the LB NET LED lights green, indicating that the HRU-412
List 8A is in a digital (NREM) loopback state. If possible, verify that the
HLU front panel displays NREM.
2 Have the CO transmit a T1 test signal to the HLU.
Measure the return (loop) signal to verify it is error free. If the signal is
not error free, remove the HRU-412 List 8A from loopback by pressing
the loopback button for five seconds. The LB NET LED should be off.
3 Have the CO send the HLU 4-in-7 in-band loop-up (NLOC) for five
seconds.
If possible, verify that the HLU front panel displays NLOC.
4 Repeat step 2.
If the test passes, a problem exists in the cable pair or in the HRU-412
List 8A. If the test fails, the problem is at the CO.
5 Check that the proper ports are in use for the HDSL and DS1 pair by
using an ohm-meter to verify that the HDSL ports have a 180k transmit
to receive resistive signature and that the DS1 ports have a 15 ohm
transmit to receive resistive signature.
Measure the return (loop) signal to verify it is error free.