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communication between components, terminals, and
modems. See also DB–9 connector, DCE port, and DTE
port.
RSCN. See registered state change notification.
RSH. Remote shell.
RTC. Real time clock.
rw. Read-write.
S
SAN. See storage area network.
SAN island. A group of storage devices and servers
connected to switches in a fabric.
SC. Standard connector.
SCSI. See small computer systems interface.
SCSI Enclosure Services (SES). A subset of the
small computer systems interface (SCSI) protocol used
to monitor temperature, power, and fan status for
enclosure devices.
SDRAM. See synchronous dynamic random access
memory.
Secure Fabric OS. An optionally-licensed software
product that runs on top of the Fabric OS and provides
customizable security restrictions through local and
remote management channels on a switch.
secure sockets layer (SSL). A security protocol that
provides communication privacy. SSL enables
client/server applications to communicate in a way that
is designed to prevent eavesdropping, tampering, and
message forgery.
sequence. A group of related frames transmitted in the
same direction between two node ports (N_ports).
SERDES. Serializer/deserializer.
service rate. The rate at which an entity can service
requests. See also request rate.
SES. See SCSI Enclosure Services.
SFP. See small form-factor pluggable.
short wavelength (SWL). A type of fiber optic cabling
that is based on 850 mm lasers and supports 1.0625
Gbps link speeds. Can also refer to the type of gigabit
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.
54
IBM TotalStorage SAN Switch: 2109 Model M12 and Model M14 User's Guide
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.
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