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switch
port.
A
port
on
a
switch.
Switch
ports
can
be
expansion
ports
(E_ports),
fabric
ports
(F_ports),
or
fabric
loop
ports
(FL_ports).
SWL.
See
short
wavelength
.
synchronous
dynamic
random
access
memory
(SDRAM).
The
main
memory
for
the
switch.
Used
for
volatile
storage
during
switch
operation.
T
Tachyon.
A
type
of
host
bus
adapter.
target.
A
storage
device
on
a
Fibre
Channel
network.
See
also
initiator
.
TCP.
See
transmission
control
protocol
.
tenancy.
The
time
from
when
a
port
wins
arbitration
in
a
loop
until
the
same
port
returns
to
the
monitoring
state.
Also
referred
to
as
loop
tenancy.
terminal
serial
port.
The
lower
serial
port
on
the
control
processor
card
(CP
card)
of
the
director
switch.
This
port
sends
switch
information
messages
and
can
receive
commands.
Can
be
used
to
connect
the
CP
card
to
a
computer
terminal.
Has
an
RS–232
connector
wired
as
a
data
terminal
equipment
(DTE)
device,
and
can
be
connected
by
serial
cable
to
a
data
communications
equipment
(DCE)
device.
The
connector
pins
2
and
3
are
swapped
so
that
a
straight-through
cable
can
be
used
to
connect
to
a
terminal.
The
device
name
is
ttyS0.
Can
also
be
referred
to
as
the
console
port.
See
also
DCE
port,
DTE
port,
and
modem
serial
port
.
throughput.
The
rate
of
data
flow
achieved
within
a
cable,
link,
or
system.
Usually
measured
in
bits
per
second
(bps).
See
also
bandwidth
.
topology.
As
applies
to
fibre
channel,
the
configuration
of
the
Fibre
Channel
network
and
the
resulting
communication
paths
allowed.
translative
mode.
A
mode
in
which
private
devices
can
communicate
with
public
devices
across
the
fabric.
transmission
character.
A
10–bit
character
encoded
according
to
the
rules
of
the
8b/10b
algorithm.
Transmission
control
protocol
(TCP).
A
communications
protocol
used
in
the
Internet
and
in
any
network
that
follows
the
Internet
Engineering
Task
Force
(IETF)
standards
for
Internet
protocol.
transmission
word.
A
group
of
four
transmission
characters.
trap
(SNMP).
The
message
sent
by
a
simple
network
management
protocol
(SNMP)
agent
to
inform
the
SNMP
management
station
of
a
critical
error.
See
also
simple
network
management
protocol
.
tunneling.
A
technique
for
enabling
two
networks
to
treat
a
transport
network
as
though
it
were
a
single
communication
link
or
local
area
network
(LAN).
Tx.
Transmitted.
U
U.
Unit
of
measure
for
rack-mounted
equipment.
UART.
Universal
Asynchronous
Receiver
Transmitter.
UDP.
See
user
datagram
protocol
.
ULP.
See
upper-level
protocol
.
ULP_TOV.
See
upper-level
timeout
value
.
unicast.
The
transmission
of
data
from
a
single
source
to
a
single
destination.
See
also
broadcast
and
multicast
.
universal
port
(U_port).
A
switch
port
that
can
operate
as
a
generic
port
(G_port),
expansion
port
(E_port),
fabric
port
(F_port),
or
fabric
loop
port
(FL_port).
A
port
is
defined
as
a
U_port
when
it
is
not
connected
or
has
not
yet
assumed
a
specific
function
in
the
fabric.
U_port.
See
universal
port
.
upper-level
protocol
(ULP).
The
protocol
that
runs
on
top
of
Fibre
Channel.
Typical
upper-level
protocols
are
small
computer
system
interface
(SCSI),
Internet
protocol
(IP),
HIPPI,
and
IPI.
upper-level
timeout
value
(ULP_TOV).
The
minimum
time
that
a
small
computer
system
interface
(SCSI)
upper-level
protocol
(ULP)
process
waits
for
SCSI
status
before
initiating
ULP
recovery.
user
datagram
protocol
(UDP).
A
protocol
that
runs
on
top
of
Internet
protocol
(IP)
and
provides
port
multiplexing
for
upper-level
protocols.
user
flash.
See
compact
flash
.
V
VC.
See
virtual
circuit
.
VCCI.
Voluntary
Control
Council
for
Interference
virtual
circuit
(VC).
A
one-way
path
between
node
ports
(N_ports)
that
allows
fractional
bandwidth.
W
WAN.
See
wide
area
network
.
WDM.
Wave
®
division
multiplexing.
Glossary
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