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Magnum 500-Series Switching Hubs Installation and User Guide (08/98)
GARRETT
18
3.3.2
Connecting Fiber Optic 100BASE-FX, Type ST and SC
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.
3.4 Internal 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
PWR
RX
LK
AUTO
F/H
FH
L K RX
F/H
100
10
TX RX
100 Mb
PWR
RX
LK
AUTO
F/H
FH FH
L K RX
F/H
100
10
TX RX
100 Mb