Section 150-611-100
Revision 02
Page 10
C. INSTALLATION AND TEST
10. INSTALLATION
10.01
Upon receipt of the equipment, visually
inspect it for signs of damage. If the
equipment has been damaged in transit,
immediately report the extent of damage to the
transportation company and to PairGain.
10.02
The HLU-611 mounts in a 220-configuration
Office Repeater Bay (ORB) shelf or
equivalent Small Cross Section Shelf (SXSS),
Kentrox T-Term, Wescom 342-30 shelves, or
PairGain HLS-410 (19”) or HLS-419 (23”). The
HLU-611 slot pin-outs are shown in Figure 4.
CAUTION
The ALM option must be disabled (DIS) when
using the Kentrox 220 T-Term shelf. This is
required to resolve a conflict between the HLU
alarm relay output and the Kentrox external
equalizer output. Both use the same pins, 20
and 21.
The HLU 611 is incompatible with the newer
Kentrox 224 shelves when these shelves are
optioned to connect their -V line (which is
normally -48 V) to -130 V. The -V line connects
to pin 40, while the HLU-231 connects both pins
39 and 40 to the -48 V line. The HLU-611 is also
incompatible with the older AT and T ORB
shelves (such as the 3 C757-30G1A, SD 3C3710-
01) that have not been modified for ASPR
(Automatic Span Powering Repeater) type T1
office repeater applications. These older bays
connect the -130 V shelf power bus to pin 40
which conflicts with the HLU-611 which
connects pin 40 to -48 V.
11. TESTING
11.01
Tables 3 through 8 provide step by step test
procedures for the HLU-611 Unit as a
function of the loopback option selected. These
procedures allow verification of the integrity of the
VHDSL channel to the HRU-612 remote unit as well
as the DS1 channels to the customer and the local
DSX-1 interface.
11.02
The HLU’s 4 character front panel display
has many useful system diagnostic
messages. They are listed in Table 9. This display
turns on when power is initially applied to the 611.
In order to conserve power, it only remains on for
five minutes if neither the MODE nor SEL buttons
are depressed. The use of either button restarts the
five minute power-control timer.
11.03
If trouble is encountered on the DSX-1
interface, verify that the hit is making a
positive connection with the mounting assembly’s
connector. Also, verify that the pre-equalizer is
properly set. All installations should be set to the
largest value that does not exceed the distance from
the DSX-1 to the shelf.
Figure 4. HLU-611 Pin-outs.
