interface converter (GBIC) or small form-factor
pluggable (SFP). See also long wavelength.
SID. The 3-byte source ID of the originator device, in
the 0xDomainAreaALPA format.
SID-DID. Source identifier-destination identifier.
SIMMS. Single in-line modules.
simple name server (SNS). A switch service that
stores names, addresses, and attributes for up to 15
minutes, and provides them as required to other devices
in the fabric. SNS is defined by Fibre Channel
standards and exists at a well-known address. Can also
be referred to as directory service. See also Fibre
Channel service.
simple network management protocol (SNMP). In
the Internet suite of protocols, a network management
protocol that is used to monitor routers and attached
networks. SNMP is an application layer protocol.
Information on devices managed is defined and stored
in the application’s Management Information Base
(MIB).
single mode. The fiber optic cabling standard that
corresponds to distances of up to 10 km (6.214 mi)
between devices.
small computer systems interface (SCSI). A parallel
bus architecture and a protocol for transmitting large
data blocks up to a distance of 15 - 25 m (49 - 82 ft).
small form-factor pluggable (SFP). An optical
transceiver used to convert signals between optical fiber
cables and switches.
SMI. Special memory interface.
SNIA. Storage Network Industry Association.
SNMP. See simple network management protocol.
SNMPv1. The original standard for SNMP, now labeled
v1.
SNS. See simple name server.
SOF. Start-of-frame.
SSL. See secure sockets layer.
standard translative mode. A hardware translative
mode that allows public devices to communicate with
private devices across the fabric. See also hardware
translative mode and QuickLoop mode.
storage area network (SAN). A network of systems
and storage devices that communicate using Fibre
Channel protocols. See also fabric.
subordinate switch. All switches in the fabric other
than the principal switch. See also principal switch.
switch. Hardware that routes frames according to
Fibre Channel protocol and is controlled by software.
switch name. The arbitrary name assigned to a
switch.
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.
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 2109 Model
M12. 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.
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