User`s manual

U.S. Robotics I-modem Command Reference
Glossary • Page G-39
shunt
A small, plastic-and-metal piece used to cover sections of pins on a jumper. The shunt
interconnects certain pins which, depending on the way the shunt is placed, determine
functions.
SPID
See Service ProÞle IdentiÞer.
S-register
An area of NVRAM that is used to store a setting.
switch
See central ofÞce switch.
Synchronous Data Link Control (SDLC)
A protocol developed by IBM for software applications and communicating devices oper-
ating in IBM's Systems Network Architecture (SNA). The protocol deÞnes operations at
the link level of communi-cations, for example, the format of data frames exchanged
between modems over a phone line. See BISYNC
, protocol, HDLC.