SYSTEM RACK

4.2 FOUR SHELF 3000 SERIES SWITCH

The system rack is a framework for modules that consists of up to 4-shelves with 13-slots per shelf. In each shelf, 12-slots are for function modules and

1-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.

4.2.1 POWER CONSUMPTION

The following tables shows the average voltage, current and power for each supply voltage per card (based on loading of 48 cards).

Table 4-6 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.

3.6 x Wattage of Power Supply = Btu/Hr.

EXAMPLE:

4.3W x 48 = 206W

206W ⎟ 0.7 = 295W

3.6 x 295W = 1,061 Btu/Hr

4.2.2 EQUIPMENT REQUIRED

•Digital Multimeter, voltmeter resolution to 0.001V.

•Transmission test set, HP 3551A.

•IBM NT compatible computer, with Call Processor Software.

•Two CIMs (023-3039-035).

4.2.3 4-SHELF POWER SUPPLY

The Power Supply has a 115/230V AC 50/60 Hz input and 4 continuous duty outputs as follows:

+5V DC 24A. -5V DC 6A. +12V DC 3A. -12V DC 5A.

The power supply can handle 2-shelves and has the following connections:

4 separate +5V 2A connections.

2separate -5V connections.

2separate +12V connections.

2separate -12V connections.

6separate ground connections.

4.2.4 POWER SUPPLY REDUNDANT PLATE

The power supply drawer can be made redundant by the use of the redundant diode plate (PN 023-3039- 553). The redundant plate allows two power supply drawers to share the load via diodes. One of the power supply drawers may be removed and the remaining drawer will supply the full load (see Figure 4-10).

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