SYSTEM RACK

SECTION 4 SYSTEM RACK
4.1 TWO SHELF 3000 SERIES SWITCH

The system rack is a framework for modules that consists of up to two shelves with thirteen slots per shelf. In each shelf, twelve slots are for function modules and one slot is reserved for the power module. The power supplies for the shelves are located in the lower portion of the rack framework. The framework also provides support for interconnection wiring, routed between shelves, and external devices.

4.1.1 POWER CONSUMPTION

The following tables shows the average voltage, current and power for each supply voltage per card (based on loading of 24 cards).

Table 4-1 AVERAGE VOLTAGE/CURRENT/POWER

Voltage

Current

Power

 

 

 

+5V DC

0.50A

2.50W

+12V DC

0.10A

1.20W

-12V DC

0.05A

0.60W

-48V DC

0.03A*

1.44W

 

 

 

 

Total

5.74W

 

 

 

* DIDs only.

Total watts including TIM-DID is 5.74W. Excluding the TIM-DID provides a total of 4.3W for

normal modules. The total wattage of the terminal is found by multiplying the wattage of a module by the number of modules.

Total Watts x No. of Modules = Terminal Power

The wattage required by the power supply is found by dividing the total wattage of the terminal by the efficiency of the power supply (0.7).

Terminal Power ⎟ 0.7 = Wattage of Power Supply

The BTUs per hour are found by multiplying a known value (3.6) by the wattage required by the power supply.

3.6x Wattage of Power Supply = Btu/Hr.

EXAMPLE:

4.3W x 12 = 51.6W

51.6W ⎟ 0.7 = 73.7W

3.6x 73.7W = 265 Btu/Hr

4.1.2 EQUIPMENT REQUIRED

1.Digital Multimeter, voltmeter resolution to 0.001V.

2.Transmission test set, HP 3551A.

3.IBM NT compatible computer, with Call Processor Software.

4.Two CIMs (023-3039-035)

4-1