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Installation Guide QLogic intelligent Storage Router (iSR)
6200 Series
Glossary-6 ISR651101-00 J
Mbps
Megabits (millions of bits) per second. A
measure of data transfer rates.
media
Physical-layer information carriers. Fibre
Channel supports several different
physical media: copper, multimode optical,
and single-mode optical. All Fibre Channel
protocols are supported on all media.
MIB
Management information base. A set of
guidelines and definitions for SNMP
functions.
mid-plane
Located inside the iSR6200 chassis
between the blades and their corre-
sponding PCMs, the mid-plane connects
the removable power supply and the
iSR6200 blades.
MTU
Maximum transmission unit. Refers to the
size (in bytes) of the largest packet ((IP
datagram) that a specific layer of commu-
nications protocol can transfer.
N_Port
Node port. Connects by a point-to-point
link to either a single N_Port or a single
F_Port. N_Ports handle creation, detec-
tion, and flow of message units to and from
the connected systems. N_Ports are end
ports in virtual point-to-point links through
a fabric, for example N_Port to F_Port to
F_Port to N_Port using a single Fibre
Channel fabric switch. See also Fibre
Channel.
network time protocol
See NTP.
NIC
Network interface card. Computer card
installed to enable a dedicated network
connection.
NL_Port
Node loop port. A port capable of
arbitrated loop functions and protocols. An
NL_Port connects through an arbitrated
loop to other NL_Port and at most a single
FL_Port. NL_Ports handle creation, detec-
tion, and flow of message units to and from
the connected systems. NL_Ports are end
ports in virtual point-to-point links through
a fabric, for example NL_Port to F_Port to
F_Port to N_Port using a single Fibre
Channel fabric switch. In the absence of a
fabric switch FL_Port, NL_Ports can
communicate with other NL_Ports in
virtual point-to-point links through an
FC_AL open loop circuit often through
FC_AL (Arbitrated Loop) hub or loop
switch devices. See: E_Port, F_Port,
FL_Port, G_Port, N_Port.
non-volatile random access memory
See NVRAM.
NTP
Network time protocol. NTP is used for
distributing the Coordinated Universal
Time (UTC) by means of synchronizing the
clocks of computer systems over
packet-switched, variable-latency data
networks.
NVRAM
Non-volatile random access memory.
NVRAM is a type of memory that retains
data (including configuration settings)
even when power is removed. You can
configure NVRAM settings manually or
restore them from a file.