ADTRAN DSU III ARdc User Manual page 118

Glossary
bisync
Bisynchronous transmission. A half-duplex, character-oriented, synchronous data com-
munications transmission method originated by IBM in 1964.
carrier detect
CD. A signal generated by a DCE (a modem or DSU/CSU). CD informs the DTE device if
the DCE is receiving a carrier signal from the line. If the CD light is on, the device is
speaking to another device.
channel service unit
CSU. A DCE device used to connect a digital phone line (T1 or Switched 56 line) coming
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 communica-
tions device). A CSU performs certain line-conditioning and equalization functions, and
responds to loopback commands sent from the central office. A CSU regenerates digital
signals, monitors them for problems, and provides a way of testing the digital circuit.
clocking
An oscillator-generated signal that provides a timing reference for a transmission link. A
clock provides signals used in a transmission system to control the timing of certain func-
tions. The clock has two functions: (1) to generate periodic signals for synchronization,
and (2) to provide a time base.
controller card
The card installed in slot 1 of an ADTRAN SMART 16 shelf, used to connect a VT 100 ter-
minal or DATAMATE for configuring SMART 16 DSU/CSU products.
customer premise equipment
CPE. All telecommunications terminal equipment located on the customer premises,
including telephone sets, private branch exchanges (PBXs), data terminals, and customer-
owned coin-operated telephones.
clear to send
CTS (also called CS). A signal on the DTE interface indicating that the DCE is clear to send
data.
Glossary-6 DSU III ARdc User Manual 61200270L1-1