Appendix H. Glossary
H-2
DSU IV ESP User Manual
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CD
carrier detect. A signal generated by a modem or DSU/CSU. CD indicates the
presence of a carrier signal on a communications link.
channel service unit
CSU. A device used to connect a digital phone line (T1 or Switched 56 line) com-
ing in from the phone company to either a multiplexer, channel bank, or directly
to another device producing a digital signal; for example, a digital PBX, a PC, or
data communications device. A CSU performs certain line-conditioning and
equalization functions, and responds to loopback commands sent from the cen-
tral office. A CSU regenerates digital signals. It monitors them for problems, and
provides a way of testing the digital circuit.
CIR
committed information rate. Less than or equal to the access rate, the CIR is used
by the service provider for rate enforcement when the network is congested.
When rates exceed the CIR, frames may be discarded.
clocking
An oscillator-generated signal that provides a timing reference for a transmis-
sion link. A clock provides signals used in a transmission system to control the
timing of certain functions. The clock has two functions, (1) to generate periodic
signals for synchronization and (2) to provide a time base.
CPE
customer premise equipment. All telecommunications terminal equipment
located on the customer premises, including telephone sets, private branch
exchanges (PBXs), data terminals, and customer-owned coin-operated tele-
phones.
C/R bit
In the Q.921 protocols, a bit that identifies a data-link-layer frame as either a
command or a response.
CRC
cyclic redundancy check. A computational means to ensure the accuracy of
frames transmitted between devices in a frame relay network. The mathematical
function is computed, before the frame is transmitted, at the originating device.
Its numerical value is computed based on the content of the frame. This value is
compared with a recomputed value of the function at the destination device.
Summary of Contents for DSU IV ESP
Page 54: ...Chapter 4 Applications 4 8 DSU IV ESP User Manual 61204011L1 1...
Page 80: ...Chapter 8 Configuring Test Options 8 4 DSU IV ESP User Manual 61204011L1 1...
Page 92: ...Chapter 9 Configuring Dial Options 9 12 DSU IV ESP User Manual 61204011L1 1...
Page 104: ...Chapter 11 Configuring Unit Utilities 11 6 DSU IV ESP User Manual 61204011L1 1...
Page 108: ...Chapter 12 Activating Dial Functions 12 4 DSU IV User Manual 61204011L1 1...
Page 134: ...Chapter 14 Viewing Status Information 14 6 DSU IV ESP User Manual 61204011L1 1...
Page 140: ...Appendix A Pinouts A 6 DSU IV ESP User Manual 61204011L1 1...
Page 152: ...Appendix B AT Commands B 12 DSU IV ESP User Manual 61204011L1 1...
Page 168: ...Appendix D Configuration Profiles D 4 DSU IV ESP User Manual 61204011L1 1...
Page 172: ...Appendix E DSU to DSU Tail Circuit E 4 DSU IV ESP User Manual 61204011L1 1...
Page 176: ...Appendix F Specifications Summary F 4 DSU IV ESP User Manual 61204011L1 1...
Page 190: ...Appendix H Glossary H 10 DSU IV ESP User Manual 61204011L1 1...
Page 194: ...Index Index 4 DSU IV ESP User Manual 61204011L1 1...
