ADTRAN DSU III TDM Manual page 127

EIA-232C
A set of standards specifying various electrical and mechanical characteris-
tics for interfaces between computers, terminals and modems. Defines the
mechanical and electrical characteristics for connecting DTE and DCE data
communications devices. It defines what the interface does, circuit func-
tions, and connector pin assignments. The standard applies to both synchro-
nous and asynchronous binary data transmission.
scrambler
A device that transposes or inverts signals, or otherwise encodes a message
at the transmitter, to make it unintelligible at a receiver not equipped with an
appropriately set descrambling device.
service
The provision of telecommunications to customers by a common carrier,
administration, or private operating agency, using voice, data, and/or video
technologies.
SMART 16
An ADTRAN rackmount system that allows up to 16 devices such as DSU/
CSUs, ISDN Terminal Adapters, or T1 DSU/CSUs to be mounted in a 19
inch or 23 inch cabinet.
SNMP
simple network management protocol. A control and reporting scheme
widely used to manage devices from different vendors. SNMP operates on
top of the Internet protocol.
SR
data set ready. A signal on the EIA-232 interface that indicates if the com-
munications is connected and ready to start handshaking control signals so
communications can begin.
switched
In regards to DSU/CSUs, the ability to perform the functions of establishing
and releasing connections on a per call basis between two or more circuits,
services or communications systems. The DSU III S2W and DSU III S4W
are examples of Switched 56 DSU/CSUs.
61200063L1-20 DSU III TDM User Manual
Appendix F. Glossary
F-7