EonStor DS S12/S16/S24 Series Hardware Manual
WARNING
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 directly at
lasers while it is turned on.
Auto speed detection
Speed auto-detection is specified by the Fibre Channel standard. If a 4Gb/s port is
connected to an 8Gb/s port, it will negotiate down and run at 4Gb/s. If there are
8Gb/s ports on both ends of the link, the link will run at 8Gb/s.
SFP transceivers
An SFP transceiver converts electrical data signals into light signals and transfers
them transparently via optical fiber. A transceiver provides bi-directional data links, a
laser transmitter (for fiber optic cables), LC connector, and a metal enclosure to
lower the EMI.
Other beneficial features of a typical SFP transceiver include a single power supply,
low power dissipation, and hot-swap capability. It is also important that any
transceiver you use meets the FC performance and reliability specifications.
WARNING
The SFP transceiver from Infortrend contains a laser diode featuring class 1 laser. To
ensure continued safety, do not remove any covers or attempt to gain access to the
inside of the product. Refer all servicing to qualified personnel.
FC port dust plugs
Each FC port comes with a dust plug. Remove these dust plugs only when you are
ready to insert an SFP transceiver.
3.2.2
Fibre-Host Topologies
The Fibre Channel standard supports three (3) separate topologies. They are
point-to-point, Fibre Channel Arbitrated Loop (FC-AL), and fabric switch topologies.
Point-to-Point: Point-to-point topology is the simplest topology. It is a direct
connection between two (2) Fibre Channel devices.
FC-AL: This is the most common topology currently in use. Fibre Channel devices
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