Industrial Redundant Ring Switch
– RS Series User Manual
Acronyms
ATM
Acronym for Asynchronous Transfer Mode, a high performance
networking technology based on the switching of fixed length, 53 byte
cells. ATM switching supports the switching of voice, video, and data;
also supports isochronous communication.
BPV
Acronym for Bi-Polar Violation.
B-ISDN
Broadband ISDN. A network standard from the CCITT and ANSI
committee. It supports voice, data and video in the same network.
CCITT
Acronym for Consultative Committee, International Telephone and
Telegraph. An international standards body responsible for setting
international communications standards that allow interoperability
among telephony and data communications equipment.
CD (DCD)
Acronym for Carrier Detect (Detect Carrier Detect).
CDDI
The use of unshielded or shielded twisted pair cable to transmit the
FDDI signal.
CO
Acronym for Central Office. The local telephone company switch that
terminates subscribers' lines for switching and connecting to the
public network.
CSMA/CD
Acronym for Carrier Sense Multiple Access with Collision Detection.
Access protocol for Ethernet.
CSU
Acronym for Channel Service Unit, a device furnished as an integral
part of a digital access line where a user wishes to supply the bipolar
signals. It provides the network with protection against user side
electrical anomalies such as surges, and provides the user with
network clocking.
CTS
Acronym for Clear To Send.
DCE
Acronym for Data Communication Equipment, aka. Data Circuit-
Terminating Equipment.
DCR
Acronym for Data Communication Ready.
DS1
Digital Signal, Level 1 is the North American data rate used for T1
carriers. It operates at 1.544Mbps and supports 24 phone lines.
DS2
Digital Signal, Level 2 is the North American data rate used for T2
carriers. It operates at 6.312 Mbps and supports four T1 lines or 96
phone calls
DS3
Digital signal, Level 3 is the North American data rate used for T3
carriers. It operates at 44.736 Mbps and supports 28 T1 lines.
DSU
Acronym for Data Service Unit, a DCE used with digital
communications circuits to provide digital data services interface.
Located on the users premises, the DSU interfaces directly with the
DTE, and provides loop equalization, remote and local test
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