958-000290-003, March 2005)

Introduction18

SFP transceivers (fiber optic connectors)

A single-mode or multimode fiber-optic cable attaches to a port through a small form pluggable

(SFP) transceiver. The SFP provides a duplex LC interface, and can be detached from the switch port

for easy replacement. Two fiber-optic transceiver types are available:

• Shortwave laser—Shortwave laser SFPs provide short-distance connections (2 to 500 meters)

through 50-micron or 62.5-micron multimode fiber.

• Longwave laser—Longwave laser SFPs provide long-distance connections (up to 10 kilometers)

through 9-micron single-mode fiber.

• Extended longwave laser—Extended longwave laser SFPs provide long-distance connections (up

to 35 kilometers) through 9-micron single-mode fiber.

Cooling fans

Four fans (each a separate FRU) provide cooling for the switch power supplies and the control

processor (CTP) card, as well as redundancy for continued operation if a single fan fails.

Each fan FRU can be replaced while the switch is operating.

Power supplies

Redundant, load-sharing power supplies step down and rectify facility input power to provide 3.3

volts direct current (VDC), 5 VDC, and 12 VDC to the CTP. The power supplies also provide input

filtering, overvoltage protection, and overcurrent protection. Either power supply can be replaced

while the switch is operational.

Each power supply has a separate CTP connection to allow for independent AC power sources. The

power supplies are input-rated at 100 to 230 volts alternating current (VAC).

Power supply requirements are listed in.

Connectors and indicators

Connectors and indicators include the:

• Initial machine load (IML) button.

• Ethernet LAN connector.

• Power and System Error LEDs (green power (PWR) and amber system error (ERR) LEDs).

• FRU status LEDs (green and amber status LEDs associated with FRUs).

• Maintenance port (RS-232).

Initial machine load button

When the IML button (Figure 1 on page 17) is pressed and held for three seconds, the switch

performs an IML that takes approximately 30 seconds and resets the following:

• Microprocessor and functional logic for the CTP and loads firmware from FLASH memory.

• Ethernet LAN interface, causing the connection to the HAFM appliance to drop momentarily

until the connection automatically recovers.