Testing - ADC HiGain HRU-402 User Manual

Installation
3 Push the unit into the card-edge connector until it is entirely within the
card guide. The unit should snap into place, indicating that the unit is
properly seated.
T
ESTING
Testing the HiGain system allows you to verify the integrity of the HDSL
channels to the HLU as well as the DS-1 channels to the customer and the
HLU DSX-1 interface. While the HRU-402 displays system condition
messages at the Remote Terminal and by color-coded LED displays on the
front panel, the HLU displays system conditions by four-character Liquid
Crystal Display (LCD) messages. To facilitate test messaging with central
office test personnel, front-panel messages for the HLU-231 List 8x are
provided in Table 4 on page
HLU-319 List 5x and the HLU-388 List 5x.
If you encounter trouble at the T1 interface, verify that the unit
is making a positive connection with the mounting assembly
connector.
To test the loopbacks:
1 Press the loopback control button on the remote unit front panel for at
least 5 seconds (see
2 Verify that the yellow HRU front panel LPBK 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, which also
indicates that the HRU-402 is in loopback.
3 Have the CO tester transmit a T1 test signal into the HLU to measure the
returned (looped) signal for errors.
4 If the above test fails, remove the remote unit from its loopback state by
again pressing the loopback control button for 5 seconds. Verify that the
LPBK LED goes off.
5 Have the CO tester send the HLU (4-in-7) in-band loop-up (NLOC) for
five seconds. Verify that the HLU displays the message NLOC
indicating that the HLU unit is in its network loopback state.
18
19. The four character messages also apply to the
Figure 2 for the location of this button).
November 5, 1998
150-402-100-03
HRU-402 List 1 and List 3