User`s manual

U.S. Robotics I-modem Command Reference
Glossary • Page G-38
Service ProÞle IdentiÞer (SPID)
A unique number, similar to an ordinary 10-digit telephone number but with up to four
digits appended, that is assigned to each device that connects to the ISDN. A SPID identi-
Þes the services to which you have subscribed and is required to be set correctly at your
device. SPIDs apply only in North America.
software ßow control
A form of ßow control that uses XON and XOFF characters to start and stop the ßow of
data.
start bit
The signaling bit attached to the beginning of each character before characters are trans-
mitted during asynchronous transmission
.
stop bit
The signaling bit attached to the end of each character before characters are transmitted
during asynchronous transmission
.