ADC HDSL4 Manuel D’Utilisation
Appendix A - Specifications
LTPH-UM-1031-03, Issue 3
60
September 12, 2003
H4TU-C-319 List 1
P
OWER
C
ONSUMPTION
The three most important power parameters of an H4TU-C are its maximum power consumption, maximum
power dissipation, and maximum current drain.
power dissipation, and maximum current drain.
describes line-powered and locally powered (remote) circuits on the maximum reach condition (34 kft.)
using 26 AWG wire.
M
AXIMUM
P
OWER
D
ISSIPATION
The maximum power dissipation measures the power converted into heat which builds up within the unit. It
contributes to the total heat generated in the space around the unit. It is used to determine the maximum number
of fully loaded shelves per bay that does not exceed the maximum allowable power dissipation density in
watts per square foot to comply with GR-63.
contributes to the total heat generated in the space around the unit. It is used to determine the maximum number
of fully loaded shelves per bay that does not exceed the maximum allowable power dissipation density in
watts per square foot to comply with GR-63.
In COs, the maximum power dissipation for open-faced, natural convection-cooled mountings is limited to
134.7 watts per square foot per GR-63-CORE. Use this limit and the parameters in
134.7 watts per square foot per GR-63-CORE. Use this limit and the parameters in
determine the maximum number of H4TU-C circuits that can occupy one CO bay.
The thermal loading limitations imposed when using the H4TU-C in a Controlled Environmental Vault (CEV) or
other enclosures are determined by applying its power parameters to the manufacturer's requirements for each
specific housing.
other enclosures are determined by applying its power parameters to the manufacturer's requirements for each
specific housing.
The -48 Vdc power consumption is the maximum total power that the H4TU-C consumes or draws from the shelf
power source. This parameter is needed when the H4TU-C is in a location remote to the CO it is serving. It
determines the battery capacity required to maintain an 8-hour, standby battery reserve for emergency situations.
Battery capacity, therefore, limits the maximum number of line units which can be installed in a remote enclosure.
Use the data in
power source. This parameter is needed when the H4TU-C is in a location remote to the CO it is serving. It
determines the battery capacity required to maintain an 8-hour, standby battery reserve for emergency situations.
Battery capacity, therefore, limits the maximum number of line units which can be installed in a remote enclosure.
Use the data in
to perform this analysis.
Table 20.
H4TU-C Power Parameters
-48 Vdc Power Consumption
(Watts)
Heat Dissipation (Watts)
-42.5 Vdc Current (mA)
Number of
Doublers
Doublers
Remote Power
Source
Source
Typical
Maximum
Typical
Maximum
Typical
Maximum
None
Locally powered
7.6
8.4
5.9
6.4
179
197
None
Line-powered
11.0
12.1
6.2
6.8
259
285
1
Locally powered
14.6
16.1
6.6
7.2
344
378
1
Line-powered
20.0
22.0
7.1
7.8
471
518
2
Locally powered
26.7
29.4
8.4
9.2
628
691
2
Line-powered
32.9
36.2
9.3
10.3
774
852
This is a worst case situation since it assumes the entire CO is subjected to the maximum power
density. More favorable conditions would permit increasing the number of shelves per bay
without jeopardizing the CO thermal integrity.
density. More favorable conditions would permit increasing the number of shelves per bay
without jeopardizing the CO thermal integrity.