Reliant Octel 200 and Octel 300 Message Servers PB6001401 Bedienungsanleitung PDF herunterladen (Seite 95)

100

101

Hardware

2-23

Octel Overture 200/300 Serenade 3.0

PB60014–01

The

PSU provides regulated d.c. voltages. The voltages are shown in T

able 2-4.

Table 2-4

Power Supply Unit d.c. V

oltages

Name

Nominal d.c. Voltage Function

+5 V 5 volts

Digital logic power

+5 VC 5 volts

Analog circuit power

+12 VM 12 volts

Fan and disk drive motor power

+12 VC 12 volts Analog

circuit power

ć12 VC ć12 volts Analog

circuit power

ć5 VC ć5 volts Analog

circuit power

The PSU provides the system power fail signal. This signal is activated if the message-server input

voltage drops out of operational range. The power fail signal interrupts the CPU as a warning of loss

of primary power

, allowing controlled shutdown of the Octel Overture 200/300.

On the Octel Overture 200, the PSU provides a protective fuse for primary power production. This

fuse is opened when a primary overcurrent occurs. The PSU contains a spare fuse.

On the Octel Overture 200, the +5-volt PSU is sensed at the center of the motherboard. Each

regulated voltage of the PSU includes overvoltage and overcurrent protection. The PSU also includes

overtemperature protection.

On the Octel Overture 300, the PSU provides the message server reset signal. This signal is activated

at power up and resets all boards in the message server

. The PSU provides a protective circuit breaker

for primary power

. This circuit breaker also acts as the message server power switch. The circuit

breaker is tripped for primary overcurrent, power supply overtemperature, and secondary overvoltage.

On the Octel Overture 300, the +5-volt PSU is sensed at the center of the shelf A motherboard. The

+12-volt fan and drive motor power is sensed at the SCSI motherboard B and SCSI motherboard C.

Each regulated voltage of the PSU includes overvoltage and overcurrent. The PSU also includes

overtemperature protection. In the case of an overtemperature occurrence, the circuit breaker opens.

Motherboard

The Octel Overture 200 has one motherboard. The Octel Overture 300 has three motherboards, one

each for shelves A, B, and C.

Octel Overture 200/300 Motherboard

The

motherboard is installed in the rear of the cabinet and distributes d.c. power to the cards, disks,

and fans.

The motherboard includes signal interconnections from slots A1 through A7 on shelf A to the rear

connectors P1 through P7, respectively

. These connectors are used for external circuit connections to

cards installed in the respective slots. For example, a line card installed in slot A1 connects to

tip-and-ring circuits of a telephone network through rear connector P1.

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Reliant Octel 200 and Octel 300 Message Servers PB6001401 Bedienungsanleitung Seite 95

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