GarrettCom 500-Series manual Connecting Fiber Optic 100BASE-FX, Type ST and SC

Magnum 500-Series Switching Hubs Installation and User Guide (08/98)

3.3.2 Connecting Fiber Optic 100BASE-FX, Type ST and SC

100

10

F/H

P WRLK RX

F H

100 Mb

T XRX

F H

AUT O

L K RX F /H

L K RX

PWR

100
10
F/H
F	H

100 Mb

TXRX

AUTO

LK

RX

F/H

100BASE-TX connections (Magnum 528F only)

The following procedure applies to 100BASE-FX applications using the Magnum 528F Switching Hub with ST-type (twist-lock) and SC-type (snap-in) fiber connectors.

1.Before connecting the fiber optic cable, remove the protective dust caps from the tips of the connectors on the Magnum 528F. Save these dust caps for future use.

2.Wipe and clean the ends of the dual connectors with a soft cloth or lint-free lens tissue dampened in alcohol. Make certain the connectors are clean before connecting.

Note: One strand of the duplex fiber optic cable is coded using color bands at regular intervals; you must use the color-coded strand on the associated ports at each end of the fiber optic segment.

3.Connect the Transmit (TX) port (light colored post on ST) on the Magnum 528F to the Receive (RX) port of the remote device. Begin with the color-coded strand of the cable for this first “Transmit-to-Receive” connection.

4.Connect the Receive (RX) port (dark colored post) on the 528F to the Transmit (TX) port of the remote device. Use the non-color coded fiber strand for this.

5.The LINK LED corresponding to the fiber port on the front of the 528F will illuminate when a proper connection has been established at both ends (and when power is ON in the unit). If LINK is not lit after cable connection, the normal cause is improper cable polarity. Swap the fiber cables on the 528F’s fiber connectors (either ST or SC type) to remedy this situation.

3.4Internal jumper settings, 100Mb RJ-45 ports, auto-negotiation ON or OFF

The factory (or default) setting is for fixed 100Mb speed (no auto-negotiation) so that the speed and mode of the Model 528’s copper Fast Ethernet ports’ operation is certain, regardless of whether the attached device does or does not properly support auto- negotiation. This is desirable when there are unknown devices presently or potentially connected, which may or may not operate correctly at all times with auto-negotiation.

In some applications, it may be desired to use standard auto-negotiation and/or to configure the first 100Mb copper port for up-link. For trained technicians, there are internal switches and jumper settings that allow these choices to be made, as described in

GARRETT

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