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132 A
: G
PPENDIX
LOSSARY
DRAM
DRJ
DRQ
DS
DS0
DSP
DSR
DTE
DTMF
DTR
DTS
ECC
EdgeServer Pro Card
Edge server card
EDO RAM
EIA
EMC
EMI
Dynamic Random Access Memory—The readable/writable memory used to store
data in PCs. DRAM stores each bit of information in a "cell" composed of a
capacitor and a transistor.
Disengage Reject—This is a call flow message.
Disengage Request—This is a call flow message.
Digital Signal—Standard specifying the electrical characteristics for data
transmission over four-wire telco circuits. DS1 is 1.544 Mbps, and DS3 is 44.736
Mbps. Also referred to as T1 and T3.
1. Digital Signal level zero—It is equivalent to one voice conversation digitized
under PCM. It transmits digital signals over a single channel at 64-kbps on a T1
facility 2. Data Slot 0
Digital Signaling Processors—A special computer chip designed to process digital
signals that were originally analog signals.
Data Set Ready—This is a call flow message.
Data Terminal Equipment—End-user equipment, typically a terminal or computer,
that can function as the source or destination point of communication on the
network.
Dual Tone Multi-frequency—The sounds a touch-tone telephone makes when its
keys are pressed.
Data Terminal Ready—A control signal that is activated to let the DCE know when
the DTE is ready to send and receive data.
Data Transformation Service—Technology designed for bypassing functions for
short-hop, line-of-sight applications. It never converts to analog. Its main use is in
high volume, data only applications in urban areas where line costs are higher.
Error Correcting Code—Code that determines whether line noise has caused data
to be garbled or dropped in transit, and then works to correct the problem. The
two most common error-correction protocols and standards used by analog
modems are MNP and V.42.
This card on the Total Control Chassis runs Windows NT 4.0 Server, provides two
10/100-Mbps ethernet interfaces, and routes call over IP networks.
This card on the Total Control Chassis runs Windows 2000 Server, provides two
10/100-Mbps ethernet interfaces, and routes call over IP networks.
Extended Data Out Random Access Memory—A more efficient method to access
memory. It reduces access memory time by 10% over the standard DRAM chips.
Electronic Industries Alliance—A trade organization who sets standards for
electronics.
Electromagnetic Compatibility—The ability of a device or system to function
without error in its intended electromagnetic environment.
Electromagnetic Interference—The leakage of radiation from equipment.
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