Rorke Data Galaxy HDX2 GHDX2-2430S-24F4D - Manual (Page 69)

Galaxy GHDX2-2430S/R-24F4D Installation and Hardware Reference Manual
4-2 Subsystem Connection and Operation
4.1.2 FC Lasers
CAUTION!
Lasers can be hazardous and may cause permanent eye damage, and
therefore must be treated with respect and used with caution. Never look
at lasers without knowing that they are turned 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.
Although non-OFC lasers are low power and do not come with this safety
feature, they can still inflict damage.
4.1.3 FC Speed Auto-negotiation
Speed auto-negotiation is currently not supported. All networking devices, e.g.,
HBAs, switches, must operate at the configured speed. Channel speed can be
configured via the rear panel DIP switches.
NOTE:
1. Fibre Channel transmission speed is also determined by cable length
and other factors. Make sure your connection and device
configuration meet the requirements specified by your cabling
devices vendors.
2. Currently Fibre host channels only operate at either the fixed 4Gb or
2Gb speed. For example, if set to 4Gb/s, all networking devices must
support the 4Gb/s transfer rate.
4.1.4 SFP Transceivers
The SFP transceivers for connecting your storage network should comply with
4Gbps or 2Gbps bi-directional data link specifications, and come with a laser
transmitter (for fiber optic cables), LC type connector, and a metal enclosure to
lower EMI.