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Glossary

RSFC

Route Switch Feature Card: Used to provide routing between

VLANs. The RSFC is a daughter card for the Supervisor engine II G and
Supervisor III G cards. The RSFC is a fully functioning router running the
Cisco IOS.

RSM

Route Switch Module: A route processor that is inserted into the

chassis of a Cisco Catalyst 5000 series switch. The RSM is configured
exactly like an external router.

RSP

Route/Switch Processor: A processor module combining the functions

of RP and SP used in Cisco 7500 series routers. See also: RP and SP.

RTS

Request To Send: An EIA/TIA-232 control signal requesting permis-

sion to transmit data on a communication line.

S reference point

ISDN reference point that works with a T reference

point to convert a four-wire ISDN network to the two-wire ISDN network
needed to communicate with the ISDN switches at the network provider.

sampling rate

The rate at which samples of a specific waveform ampli-

tude are collected within a specified period of time.

SAP

1) Service Access Point: A field specified by IEEE 802.2 that is part of

an address specification. 2) Service Advertising Protocol: The Novell Net-
Ware protocol that supplies a way to inform network clients of resources and
services availability on network, using routers and servers. See also: IPX.

SCR

Sustainable Cell Rate: An ATM Forum parameter used for traffic

management, it is the long-term average cell rate for VBR connections that
can be transmitted.

scripts

A script predefines commands that should be issued in sequence,

typically to complete a connection or accomplish a repetitive task.

SDLC

Synchronous Data Link Control: A protocol used in SNA Data Link

layer communications. SDLC is a bit-oriented, full-duplex serial protocol
that is the basis for several similar protocols, including HDLC and LAPB. See
also: HDLC and LAPB.

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