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Appendix D. Glossary
craft port
The electrical interface between the MX2800 and the control terminal. The con-
trol terminal is used to communicate commands to the unit.
CSU
channel service unit. A device used to connect a digital phone 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 communications device. A CSU performs certain line-conditioning and
equalization functions, and responds to loopback commands sent from the cen-
tral office. A CSU also regenerates digital signals. It monitors them for problems
and provides a way of testing the digital circuit.
CTS
clear to send. A signal on the DTE interface indicating that the DCE is clear to
send data.
data communications equipment
See DCE.
data service unit
See DSU.
dB
decibel. A unit of measure of signal strength; usually the relation between a
transmitted signal and a standard signal source.
DCE
data communications equipment. Device that provides all the functions required
for connection to telephone company lines and for converting signals between
telephone lines and DTE. Also see DTE.
DDS
digital data service. A private line digital service for transmitting data
end-to-end at speeds of 2.4, 4.8, 9.6, and 56 kbps (and in some cases 19.2, 38.4, or
64 kbps). The systems can use central hub offices for obtaining test access, bridg-
ing legs of multi-point circuits, and cross connecting equipment. DDS is offered
on an inter-LATA (local access and transport area) basis by AT&T and on an
intra-LATA basis by the Bell operating companies.
D-4
MX2800 User Manual
61200290L1-1
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