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AR3016G Installation and Hardware Reference Manual
4.1.2
FC Lasers
Lasers can be hazardous and may cause permanent eye damage or
blindness, and therefore must be treated with respect and used with
caution. Never look at lasers without knowing whether they are on or off.
Wavelengths: The lasers on fiber optic cables emit either short wave (SW)
beams (770nm-860nm) or long wave (LW) (1270nm-1355nm) beams.
Cables using either of these wavelengths can be used.
Laser types: Two (2) types of laser devices can be used in FC cables:
Optical Fibre Control (OFC) and non-OFC lasers. The OFC lasers are high-
powered and can be used over long distances.
Safety features: Due to their high power output, OFC lasers usually come
with a safety mechanism that switches the laser off as soon as it is
unplugged. Non-OFC lasers are low power and do not come with these
safety features; however, they can still inflict damage.
4.1.3
FC Speed Auto-detection
Speed auto-detection is specified by the Fibre Channel standard. If a 2Gb/s
port is connected to a 4Gb/s port, it will negotiate down and run at 2Gb/s. If
there are two 4Gb/s ports on either end of the link, the link will be run at
4Gb.
If the Fibre Channel cable being used is too long for your system, it
may end up running at slower speed even with two (2) 4Gb/s ports.
4.1.4
SFP Transceivers
Once you have purchased your FC cables, it may be necessary to connect
them to SFP transceivers. These transceivers should typically have at least
4Gbps bi-directional data links, a laser transmitter (for fiber optic cables),
LC connector, and a metal enclosure to lower the EMI.
LC connectors are small form-factor, fiber-optic connectors based on a
1.25-mm ceramic ferrule with the familiar latching mechanism of the RJ-
45 modular plug and jack.
Other beneficial features of a typical SFP transceiver include a single power
supply, low power dissipation, and hot-swap capability. It is also important
4-2
CAUTION!
NOTE:
NOTE:
FC Host Connection Prerequisites
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