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Magnum DS80F & DS80C Dual-speed Stackable Hubs Installation and User Guide (12/01)
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3.2.2 Connecting Fiber Optic ST-type, “twist-lock”
The following procedure applies to installations using ST-type fiber connectors. This
procedure applies to ports using a multi-mode ST fiber connectors.
1. Before connecting the fiber optic cable, remove the protective dust caps from the tips of
the fiber connectors. Save these dust caps for future use.
2. Wipe 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 the Magnum Fiber port to the
Receive (RX) port of the remote device. Begin with the color-coded strand of the cable
for this first TX-to-RX connection.
4. Connect the Receive (RX) port (dark colored post) to the Transmit (TX) port of the
remote device. Use the non-color coded fiber strand for this.
5. The LINK LED on the front of the fiber connector 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 at the fiber connector to remedy this situation.
3.2.3 Connecting Fiber Optic SC-type, "Snap-In"
The following procedure applies to installations using SC-type fiber connectors, i.e.,
using multi-mode SC and SC single-mode.
When connecting fiber media to SC connectors, simply snap on the two square male
connectors into the SC female jacks of the Fiber connector until it clicks and secures.
3.2.4 Connecting Single-Mode Fiber Optic
When using single-mode fiber cable, be sure to use single-mode fiber port connectors.
Single-mode fiber cable has a smaller diameter than multi-mode fiber cable (9/125 microns for
single-mode, 50/125 or 62.5/125 microns for multi-mode where xx/xx are the diameters of the
core and the core plus the cladding respectively). Single-mode fiber allows full bandwidth at
longer distances, about 20Km with the multi-mode SC.
The same procedures as for multi-mode fiber apply to single-mode fiber connectors.
Follow the steps listed in Section 3.2.2 above.
3.2.5 Power Budget Calculations for DS80F Fiber Media
Receiver Sensitivity and Transmitter Power are the parameters necessary to compute
the power budget. To calculate the power budget of different fiber media installations using
Magnum products, the following equations should be used:
OPB (Optical Power Budget) = P
T
(min) - P
R
(min)
where P
T
= Transmitter Output Power, and P
R
= Receiver Sensitivity
Worst case OPB = OPB - 1dB(for LED aging) - 1dB(for insertion loss)