McDATA Eclipse 2640 SAN, Administration And Configuration Manual

Page: 262 / 276

g-52 Eclipse™ 2640 SAN Router Administration and Configuration Manual
Glossary
SCSI See
small computer system interface .
segment
A fabric segments when one or more switches cannot join the fabric
because of various reasons. The switch or switches remain as separate
fabrics.
segmented E_Port See
segmented expansion port .
segmented expansion
port
Segmented E_Port. E_Port that has ceased to function as an E_Port
within a multiswitch fabric due to an incompatibility between the
fabrics that it joins.
See also
bridge port ; fabric loop port ; fabric port ;
generic port ; hub port ; node loop port ; node port .
serial port
A full-duplex channel that sends and receives data at the same time.
It consists of three wires: two that move data one bit at a time in
opposite directions, and a third wire that is a common signal ground
wire.
server
A computer that provides shared resources, such as files and printers,
to the network. Used primarily to store data, providing access to
shared resources. Usually contains a network operating system.
SFP transceivers See
small form factor pluggable transceivers .
shared mode
If a director or switch is in shared mode, all devices on the loop share
the 100MB bandwidth available on the loop. In shared mode, only
one end device can communicate with another device through the
fabric loop port (FL_Port) on the director or switch.
shortwave
Lasers or light-emitting diodes (LEDs) that emit light with
wavelengths around 780 nm or 850 nm. When using multimode fiber
(50 nm) shortwave lasers can be used with Fibre Channel links less
than 500 m. To achieve longer lengths, single-mode fiber is required.
The preferred fiber core size is 50 micron as this fiber has large
bandwidth so that the distance is limited by the fiber attenuation. A
62.5 micron core size is also supported for compatibility with existing
FDDI installations. Fiber of this type has smaller bandwidth and, in
this case, the distance is limited by the fiber bandwidth.
simple mail transfer
protocol
SMTP. A transmission control protocol/Internet protocol (TCP/IP)
protocol that allows the user to create, send, and receive text
messages. SMTP protocols specify how messages are passed across a
link from one system to another. They do not specify how the mail
application accepts, presents, or stores the mail.