Appendix C. Acronyms and Abbreviations

PU

physical unit

PVC

permanent virtual circuit

RD

receive data

RDL

remote digital loopback

RFC

request for comments

RFECN

remote forward explicit congestion notification

RIP

routing information protocol

RMA

return material authorization

RNR

receiver not ready

RR

receiver ready

RS

request to send; also recommended standard

RTS

request to send

Rx

receive

SAP

service access point

SDLC

synchronous data link control

SES

severely errored seconds

SF

superframe

SLIP

serial line internet protocol

SNA

systems network architecture

SNMP

simple network management protocol

SR

data set ready

SVC

switched virtual circuit

SW56

switched 56

sync

synchronous

TD

transmit data

telco

telephone company

TR

data terminal ready

Tx

transmit

UA

unavailable

C-4

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