Data link layer
Transforms the packets of
the Network Layer so they can be physically conveyed by
the Physical Layer.
D-AMPS
digital AMPS Used by Ericsson
Inc. to describe IS-136 time division multiple access technology.
Datagram service
Connectionless form
of packet swithcing wherby the source does not need to establish
a connection eith the destination before sending data packets
DCS 1800
digital cellular system A
global system for mobile communications-based PCS network
used outside of the U.S.
DCMA
dynamic channel multicarrier
architecture. A technology developed by ComSpace Corp.
Used for specialized mobile
radio networks that can configure the number and bandwidth
of voice and data channels based on a carrier's requirements.
|
De minim
Having such minimal impact as to not
influence the matter at hand.
Costs of providing a service, for
instance, may be so low that the party requesting the service sees
them as de minimus and an invalid reason for not offering a service.
DECT
digital European cordless telephone
Used as a cordless phone and wireless office phone system in Europe.
DEMS
digital electronic message service.
The FCC wants to relocate this service from 18 GHz to 24 GHz.
DES
Data encryption standard
Algorithm that protects unclassified computer date available for
public and goverment use.
DHCP
Dynamic host configuration protocol.
Issues IP addresses automatically
wihtin a range to devices such as PC's when they are first powered
on
Disaggregation
The splitting of a spectrum license
into two or more licenses of fewer frequencies.
|
DISCO II
FCC proceeding on domestic-international
satellite service consolidation.
Disassociation service
process that station or access point
uses to notify that it is terminating an existing association.
Downlink
The portion of a telecommunications
path from a satellite to the ground.
Also referred to as the reverse
link.
Drive test
A method of taking signal strength
measurements in a cellular coverage area.
Driver distraction
A key concern of transportation and
law enforcement agencies, wireless carriers and other entities,
driver distraction is a diversion of attention caused by many factors.
Factors can include changing
a compact disc or cassette tape, tuning a broadcast radio dial,
eating or drinking or talking on cellular phones.
DSP
Digital signal processor
A microprocessor that digitizes analog signals.
DSU/CSU
Network components that shpae data
signals into a form that can be transmitted over a digital transmission
medium like leased 56Kbps or T1
DQPSK
differnential quadrature phase
shift keying. Modulation process that the IEEE 802.11 direct sequence
physical layer uses to trandmit data
Dual band
Describes a handset that works on
800 MHz cellular and 1900 MHz PCS frequencies.
Dual mode
Describes a handset that works on both analog and digital networks.
|
