System information

Glossary
Issue 1 October 1997 GL- 29
synchronizer
The name given to the trusted server by the e-mail vendor, Lotus Notes.
synchronous communication
A method of data transmission in which bits or characters are sent at regular time intervals, rather
than being spaced by start and stop bits. See also asynchronous communication.
synchronous transmission
A type of data transmission where the data characters and bits are exchanged at a fixed rate with
the transmitter and receiver synchronized. This allows greater efficiency and supports more pow-
erful protocols.
System 75
An advanced digital switch manufactured by Lucent Technologies that supports up to 800 lines
for voice and data communications.
System 85
An advanced digital switch manufactured by Lucent Technologies that supports up to 3000 lines
for voice and data communications.
system configuration
See configuration.
T
T.30
The standard for Group III fax machines that covers the protocol used to manage a fax session
and negotiate the capabilities supported by each fax endpoint.
tape cartridge
One or more spare removable cartridges required to back up system information.
tape drive
The physical unit that holds, reads, and writes to magnetic tape.
TCP/IP
See transmission control protocol/internet protocol (TCP/IP).
TDD
See telecommunications device for the deaf (TDD)
.
TDM
See time division multiplexing (TDM).
telecommunications device for the deaf (TDD)
A device with a keyboard and display unit that connects to or substitutes for a telephone. The
TDD allows a deaf or hearing-impaired person to communicate over the telephone lines with other
people who have TDDs. It also allows a deaf person to communicate with the INTUITY AUDIX sys-
tem.
terminal
See display terminal
.