3Com NBX 100 Administrator's Manual - page 552
552
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LOSSARY
CSU
Channel Service Unit. Data transmission equipment to repeat the signal
from the carrier and link to CPE. Vendors add value to CSUs by adding
performance monitoring and management features.
CTI
Computer Telephony Integration. A generic name for the technology that
connects computers and telephone systems through software
applications.
D
data compression
A method of reducing the amount of data to be transmitted by reducing
the number of bits needed to represent the information.
delayed ringing
Prevents a telephone on a shared line from ringing until the incoming call
has rung on other telephones a set number of times.
delayed ringing
pattern
The definition for the order in which telephones ring and how many
times each telephone rings.
demand priority
access
A method for supporting time-sensitive applications such as video and
multimedia as part of the proposed 100BASE-VG standard offering
l00Mbit/s over voice-grade UTP cable.
DHCP
Dynamic Host Configuration Protocol. A method by which devices are
assigned temporary, renewable IP addresses by a server when the devices
become active on the network.
DID/DDI
Direct Inward Dial/Direct Dialing Inward. A feature that allows outside
calls to reach an internal extension without going to an operator or
Automated Attendant.
direct mail transfer
Transfers a caller directly to another user’s voice mail without requiring
them to wait through ringing and without interrupting the recipient.
domain
A group of nodes on a network that form an administrative entity. A
domain can also be a number of servers that are grouped and named to
simplify network administration and security.
DSP
Digital Signal Processor. A special-purpose CPU tailored to manage
complex mathematical functions. A DSP takes an analog signal and
reduces it to numbers so its components can be isolated, sampled, and
rearranged more easily than in analog form.
DSU/CSU
Digital (or Data) Service Unit/Channel Service Unit. A pair of
communications devices that connect an in-house line to an external