SYSTEM RACK

4.4 EIGHT SHELF 3000 SERIES SWITCH

The system rack is a framework for modules that consists of up to 8-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.

4.4.1 POWER CONSUMPTION

The following tables shows the average voltage, current and power for each supply voltage per card (based on loading of 96 cards).

Table 4-16 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 96 = 413W

413W ⎟ 0.7 = 590W

3.6x 590W = 2,123 Btu/Hr

4.4.2EQUIPMENT REQUIRED

Digital Multimeter, voltmeter resolution to 0.001V.

Transmission test set, HP 3551A.

IBM NT compatible computer, with NetSMM Call Processing Software.

Two CIMs (023-3039-035)

4.4.3VERIFY RESISTANCE OF BUS BAR AND POWER SUPPLY LINES

1.Verify the Power Cables are not connected to a power source.

2.Verify the Power Supplies are not installed in the Power Supply shelf.

3.Measure the resistance from point-to-point and verify the resistance as shown in Table 4-17.

Table 4-17 BUS BAR RESISTANCE

Ohm Meter Lead Positions

Resistance in

 

 

 

From

To

 

 

Ohms

 

 

 

Bus Bar A1-A2

Chassis/Frame

Infinite

Bus Bar A1-A2

B1-B2

Black

0

Bus Bar A1-A2

C1-C2

Red

Infinite

Bus Bar A1-A2

D1

Blue

Infinite

Bus Bar A1-A2

E1

White

Infinite

Bus Bar A1-A2

F1

Green

Infinite

C1-C2 Red

D1

Blue

Infinite

D1-Blue

E1

White

Infinite

E1-White

F1

Green

Infinite

4-20