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Section 150-231-164
Revision 04
4. TESTING
4.01
Table 13 through Table 18 provide step-by-step
test procedures for the HLU-231 List 6D as a
function of the loopback option selected. These
procedures allow verification of the integrity of the HDSL
channels at every module location as well as the DS1
channels to the customer and the local DSX-1 interface.
4.02
The HLU-231 List 6D 4-character front panel
display has many useful system diagnostic
messages; which are listed in Table 19. The display
turns on when power is initially applied to the HLU-231
List 6D. In order to conserve power, it only remains on
for five minutes if neither the MODE or SEL buttons are
pressed. The use of either button activates the 4-
character display and restarts the 5-minute power-
control timer.
Figure 14. HLU-231 Doubler Loopback Configurations. The most important of the HiGain family of loopback options is the Smart-
Jack loopback, which emulates the functions of a standard NID.
Page 36
4.03
If trouble is encountered on the HLU-231 List 6D
DSX-1 interface, verify that the HLU-231 List 6D
(Table 1) is making a positive connection with the
mounting assembly's connector. Also, verify that the
equalizer is set to EXT for driving external equalizers or
per the equalization settings of Table 1 for internal
equalization. All installations should be set to the largest
value that does not exceed the distance from the DSX-1
to the shelf.
4.04
The transmit and receive T1 DSX-1 ports have
splitting access and bridging miniature 210-
series jacks as shown in Figure 2. Connecting one
cable between the two bridging jacks and another
between the two SPAN jacks splits the XMT and RCV
and creates metallic loopbacks towards both the DSX-1
and the HLU-231 List 6D. If plugs are inserted into both
SPAN jacks, the BRG jacks can be used to send and
receive test patterns towards the DSX-1.
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