05-3 BST DC Power Heat Cooling Guidelines

7/30/2019 05-3 BST DC Power Heat Cooling Guidelines

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Copyright Alvarion Inc.

Professional Services

Base Station

DC Power, Heat Dissipation &

Cooling Requirements

January 2008


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2

DC Power Requirements

1


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3 DC Power Requirements

Use the following table to calculate worst-case power source requirements

for the Base Station equipment:


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4Calculating Power Requirements for2nd Order Diversity Configuration

Example (2nd Order Diversity)

2.x GHz Base Station with (3) 120 sectors, operating with DL-UL ratio of 50-50,with 3 AU-IDUs, 6 ODUs, a GPS Adapter and an Outdoor GPS Receiver (All 6

ODUs are powered from the PIU)

PIU: 16W

AVU: 24W

NPU: 65W

GPS Adapter: 1.2WOutdoor GPS Receiver: 6W

AU-IDUs: 46W * 3 = 138W

PSU Efficiency: 80%

Sub-Total: 16 + [24+65+1.2+6+138/.8] = 309W

Excluding the PIU, the total power that should be supplied by PSUs is 293W.

Since each PSU can support a maximum of 200W, we need at least 2 PSUs. A

third PSU will support a 2+1 redundancy.


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5Calculating Power Requirements for2nd Order Diversity (cont)

When calculating the power requirements associated with the ODUs, we

should distinguish between the peak power consumption (maximumcurrent) and the average power consumption (taking into account Tx/Rx

ratio) that affect the requirements from a backup power source.

Peak Power Consumption:

AU-ODUs:89W * 6 = 534W (Powered directly from PIU)

Peak Power Total: 534 + 309 = 843W.

Average Power Consumption:

The average power consumption of 6 ODUs, assuming DL-UL (Tx/Rx) ratio of60-40, is:

AU-ODUs:

[89W * .60] * 6 = 320W (DL power consumption - directly from PIU)

[15W * .40] * 6 = 36W (UL power consumption directly from PIU)

Average Power Total: 356 + 309 = 665W


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6Calculating Power Requirements 4thOrder Diversity

Example (4th Order Diversity)

2.x GHz Base Station with (6) 60 sectors, operating with DL-UL ratio of 60-40,with 6 AU-IDUs, 24 ODUs, a GPS Adapter and an Outdoor GPS Receiver (4

ODUs are powered from the PIU, 20 ODUs are powered by 5 Power Feeders)

PIU: 16W

AVU: 24W

NPU: 65W

GPS Adapter: 1.2W

Outdoor GPS Receiver: 6W

AU-IDUs: 46W * 6 = 276W

PSU Efficiency: 80%

Sub-Total: 16 + [24+65+1.2+6+276/.8] = 481W

Excluding the PIU, the total power that should be supplied by PSUs is 465W.

Since each PSU can support a maximum of 200W, we need at least 3 PSUs.

A fourth PSU will support a 3+1 redundancy.


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7Calculating Power Requirements 4thOrder Diversity (cont)

Peak Power Consumption:

AU-ODUs:

89W * 4 = 356W (Powered directly from PIU)

89W * 20 = 1780W (Powered from 5 ODU Power Feeders)

Power Feeders: 2W * 20 = 40WNOTE: If High Power PIU is used, Power Feeders not needed unless 6 sector configu ration in w hich

case, 1 power feeder is n eeded.

Peak Power Total: [356 + 1780 + 40][ 2176 ] + 481 = 2657W

Average Power Consumption:

Average power consumption of 24 ODUs, assuming DL-UL (Tx/Rx) ratio of 60-40:

AU-ODUs:

[89W * .60] * 4 = 214W (DL power consumption - directly from PIU)

[15W * .40] * 4 = 24W (UL power consumption directly from PIU)

[89W * .60] * 20 = 1068 (DL power consumed from ODU Power Feeders)

[15W * .40] * 20 = 120W (UL power consumed from ODU Power Feeders)

Power Feeders: 2W * 20 = 40W

Average Power Total: [214+24+1068+120+40][ 1466 ] + 481 = 1947W


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8

Heat Dissipation & Cooling

2


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9 Site Environmental Specifications


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10 Heat Dissipation

Use the following formula to calculate the heat dissipation for each Base

Station:

[(Module 1 power consumption) + (Module 2 power consumption) + (Module N

power consumption)] x 2.3884 = BTU

Example:

Base Station with 3 AU-IDUs and 1 NPU, the heat dissipation is as follows:PIU: 30W

AVU: 24W

PSU: 200W

NPU: 65W

AU-IDU: 41W * 3 = 123W

Total: [30 + 24 + 200 + 65 + 123] x 2.3884 = 1056 BTU


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11 Cooling Requirements

The BreezeMAX Chassis is intended for mounting in a cabinet or other

rigid framework which is fixed to the building.

The BreezeMAX chassis is cooled by the flow of air between the

elements mounted in the cabinet.

The fans and air baffles ensure that sufficient air flows between the elements.

The cooling system, including the baffle and fan tray, is supplied with each

chassis and is an integral part of the BreezeMAX chassis. It does not require

separate installation.

Documents

05-3 BST DC Power Heat Cooling Guidelines