Verilink AS2000: The Basics (880-502981-001) Product Manual - Manual (Page 134)

Acronyms and Definitions
Glossary-14 Verilink Access System 2000: Basics
data terminal equipment (DTE) Data communication equipment
(computers, digital PBX, terminals,
and video equipment) that connect
to data circuit- terminating
equipment (DCE) . DTE can
generate and receive data carried
by the network.
DC Direct Current. An electric current
in which electrons flow in one
direction only.
DCE See data circuit- terminating
equipment (DCE) .
decibel (dB) A measure of the relative strength
of two signals. The number of
decibels is ten times the log ratio
of the power of two signals or 20
times the log ratio of the voltage
of two signals.
degraded minute (DM) A predetermined time segment
during which a predetermined
number of errors has occurred.
There is no loss of communication,
but throughput can be
compromised.
DIDCSU Dual Integrated Data Service Unit
(DSU) and Channel Service Unit
(CSU) an AS2000 application
module.
Digital Data Service (DDS) A digital communications line
carrying data at 64 kbit/s or less.
digital multiplexer/ demultiplexer A digital multiplexer takes several
lower speed digital lines (channels)
and combines them into one faster
digital line (channel). A digital
demultiplexer device takes a
digital line and divides it into
several channels.
Digital Signal Level 0 DS0. A 56K or 64K timeslot which
forms 1/24 of a T1 or 1/32 of an
E1 signal (known as E0).
Digital Signal Level 1 DS1. The 1.544 Mbit/s digital
signal carried on a T1. There are
24 DS0s in a T1 line. Each DS0 can
transmit 64 kbit/s or 56 kbit/s
signals.