ADC 2 User Manual page 16

Generic Information
3 This rule minimizes power consumption and dissipation from the HLU
providing doubler power. It requires the spans closer to the HLU to be as
short as possible and the spans farther from the HLU to be as long as
possible. This choice minimizes the I
reduces the thermal stress on the HLU.
Only those HRUs that have a local powering option can be
used in local HRU-powered applications.
The HDU-409 can be housed in a variety of outdoor enclosures manufactured
by ADC and a variety of other vendors. The number of doublers used in any
of the enclosures depends on the maximum outside ambient temperature. The
doubler capacities for several of these standard enclosures are listed in
Table 4, Table
Table 5 and Table 6
(+46.1°C). Consult ADC for the latest deployment rules when using the
enclosures at ambient temperatures above 115 °F or when using enclosures
not listed.
These requirements comply with Bellcore standards, which
require HDSL equipment placed in outdoor cabinets to
operate in an outside ambient temperature of -40°F (-40°C)
with no solar load and +115°F (+46.1°C) with a maximum solar
load and maximum power dissipation.
Full solar load is equal to maximum sunlight exposure as
defined in Bellcore's Technical Advisory TR-TSY-000057.
The capacities listed for the indoor enclosures in
no solar load. The capacities listed for the outdoor enclosures in
Table 6 on page 15
"Recommended Slot Assignment for Maximum Capacity" column assigns
slots according to the following thermal stress reduction rules:
10
5, and Table 6 starting on
are based on a maximum outside temperature of +115°F
assume a full solar load as described above. The
April 30, 2003
2
R loss in the cable pairs and
page 11. The capacities listed in
Table 4 on page 11
HDU-409 Lists 1, 2, and 3
LTPH-UM-1234-01
assume
Table 5 and