ADC and 3 Doubler - Manual (Page 27)

LTPH-UM-1234-01 Installation
HDU-409 Lists 1, 2, and 3 April 30, 2003 21
1 To install the doubler unit, slide the doubler unit into the card guides for
the desired slot (see
Figure 5 on page 20 ).
2 Next, push the unit into the enclosure until it is seated in the card-edge
connector. The unit snaps into place, indicating that it is properly seated.
Once the HDU-409 is installed in the enclosure, the front panel Status LED
flashes green to indicate power is applied from an upstream line unit. When
the loops on both sides of the HDU synchronize, the LED is steady green.
Refer to
Table 2 on page 5 for more details on LED operations.