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I
NSTALLATION
1
To set the simplex sealing current (SCURR), do one of the following:
•
If the HRU-488 List 1 is to be used with an HDU-451 List 1, List 2, List 3,
or List 3B doubler, disable the simplex sealing current by placing the
SCURR switch in the up position. The HRU-488 sealing current circuit is
not compatible with these doublers.
•
If the HRU-488 List 1 is to be used with the following compatible doublers,
enable the SCURR switch (down position).
–
HDU-404, HDU-407, HDU-409
–
HDU-437, HDU-439 List 1 or List 1B
–
HDU-451 List 4 or List 4B
2
To enable the Transmit Loss of Signal (TLOS) Loopback (LB), set the switch to
the down position.
3
Set the Receive Level (RCVLEV) switch to the down (-15 dB) position or the up
(0 dB) position.
4
Lift the front panel and slide the HRU-488 List 1 into the enclosure slot guides.
Push the unit back until properly seated in the backplane card-edge connector.
Þ
Continued
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