Document No. CO 004844K
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• Grasp the SFP module between your thumb and index finger
and carefully remove it from the port.
To install an SFP or XFP:
• Carefully line up the module and fully insert it into the port.
• Close the bale clasp.
Importance of Attenuation
Optical receivers are specified to operate only within a certain
range of optical power. Signals that are too low in power can
result in a Loss of Signal indication or in bit errors. Signals that
are two strong can likewise result in bit errors but may also
result in permanent damage to the receiver.
When looping the unit on itself, or when connecting any signal
to the RX port, confirm with an optical power meter that the
optical power is within the specified range for the optical trans-
ceiver you are using. If a signal is too strong, use an optical
attenuator to bring the power level into the specified range.
Optical receivers which are damaged or destroyed by high-pow-
ered optical signals are not covered under warranty. Repair costs
can be several thousand dollars.
Single-Mode/Multi-Mode Fiber
Single-mode (SM) fiber has a very small light-carrying core,
allowing the light to travel only one path or “mode”. Multi-mode
(MM) fiber has a relatively large core and the light is allow to
travel multiple paths or “modes” through the fiber. SM fiber is
used for longer distance transmission with laser-diode-based
transmitters. MM fiber is normally used for shorter distance
applications with LED-based transmitters.
The NIC Platform supports both SM and MM optical transceiv-
ers. It is important to use the correct fiber for your application. In
general, 1310nm and 1550nm optical modules are usually SM
and 850nm optical modules are usually MM. The TX wave-
length is displayed on the GUI just below the Laser on/off but-
ton. See figure.
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