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RCF
Registration Confirm—This is a call flow message.
RISC
Reduced Instruction Set Computer— Central processing unit architecture that
greatly reduces processing time by having fewer, simpler instructions programmed
into ROM, but allowing for complex processing by combining these simple
instructions; primarily used in workstations.
RFI
Radio Frequency Interface—An interface of a programmable switch matrix
between the RF test instruments of a CASS RF or CNI configuration to a series of
front panel bulkhead connectors.
RRAS
Routing and Remote Access Service— Microsoft Windows NT's (RRAS) Routing and
Remote Access Service is used for terminating RAS/PPP calls on a Microsoft Windows
NT system.
RRJ
Registration Reject—A registration request from an H.323 Gateway to an H.323
Gatekeeper was rejected.
RRQ
Registration Request—An H.323 Gateway has requested to register with a remote
H.323 Gatekeeper endpoint.
RTP
Real Time Protocol—The format of the audio/voice data as it travels through VoIP.
RTS
Request to Send—An RS-232 signal provided by a DTE device to a DCE device
saying "I am ready when you are". The RTS/CTS RS-232 signals are often used for
flow control between a modem and serial port.
SCSI
Small Computer System Interface—The way the peripherals communicate with
the computer's main processor.
SDL
Signaling Data Link or Software Download
SF
Super Frame—Common framing type used on T1 circuits. SF consists of 12 frames
of 192 bits each, with the 193rd bit providing error checking and other functions.
SF is superseded by ESF, but is still widely used. Also called D4 framing.
SCP
Service Control Points—The SCP stores customer specific information for example,
toll free numbers, and converts the information received from the incoming call
and directs the call to its destination.
SIP
Session Initiation Protocol—Provides advanced telephony services across an IP
network.
SGP
Signaling Gateway Platform—This is the SS7 Signaling Gateway platform. 3Com's
SS7 signaling Gateway is an intelligent service exchange node that integrates
services between the circuit and packet networks to deliver significant cost savings
with IMTs for voice trunk access instead of ISDN PRIs.
SLAP
Signaling LAN Application Protocol—SLAP is the interface between the Total
Control Chassis and the external SS7 Gateway system. It replaces the D-channel
signaling that normally exists in an ISDN PRI interface. SLAP is 3Com's proprietary
software.
SSP
Signaling Switch Point—Simply put, this is the telephone switch.
Appendix : Glossary 137
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