Power Consumption; Maximum Power Dissipation; Maximum Current Drain - ADC HiGain H2TU-C-388 List 1E User Manual

152-388-115-03, Issue 03
P C
OWER ONSUMPTION
The maximum power consumption and heat dissipation depends upon the type of remote and regenerator units in
the system and the CPE power setting.
The three most important power parameters of an H2TU-C are its maximum power consumption, maximum
power dissipation, and maximum current drain.
Table 24 describes line-powered circuits on 9 kft, 26 AWG loops without a regenerator.
H2TU-R Model No.
H2TU-R-402
M P
AXIMUM OWER
The Maximum Power Dissipation measures the power that is converted into heat. The heat builds up within the
unit and contributes to the total heat generated in the space around the unit. The Maximum Power Dissipation is
used to ensure that the maximum number of fully loaded shelves per bay 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. The footprint of a standard 28-slot, 23-inch HMS-317 shelf is
7.024 square feet. Therefore, the maximum bay dissipation is limited to 946 watts. Use this limit and the
parameters in Table 24
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.
The thermal loading limitations imposed when using the H2TU-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.
The -42.5 Vdc Power Consumption is the maximum total power that the H2TU-C consumes or draws from the
shelf power source. This parameter is needed when the H2TU-C is in a location remote to the CO it is serving. It
determines the battery capacity required to maintain an 8-hour, stand-by 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 Table 24
M C
AXIMUM URRENT
The Maximum Current Drain is the maximum current drawn from the shelf power supply when it is at its
minimum voltage (-42.5
Table 24 above to determine the shelf fusing requirements for your particular H2TU-C applications.
H2TU-C-388 List 1E
Table 24. H2TU-C-388 Power Parameters—No Regenerator
H2TU-R -42.5 Vdc Power
CPE Power Consumption (Watts)
Typical
11.5
D
ISSIPATION
above to determine the maximum number of H2TU-C circuits that can occupy one CO bay.
above to perform this analysis.
D
RAIN
). This determines the shelf fusing requirements. Use the -42.5 Vdc current data in
Vdc
April 21, 2000
Heat Dissipation (Watts)
Maximum Typical
12.5 6.0
Appendix A - Specifications
-42.5 Vdc Current (mA)
Maximum Typical
7.0 270.0
Maximum
294.0
57