AddPac IPNext190 Installation Manual page 124

IPNext 190 System Installation Guide
CODEC
Console
CoS
Decryption
DHCP
DNS
DS-3
DSP
DTMF
E&M
E1
Encryption
Ethernet
Stands for COder-DECoder. CODEC is: 1. A built-in circuit device that converts analog
signals to digital bit streams and vice versa based on a pulse code modulation method; 2. A
DSP software algorithm that compresses or decompresses voice or audio signals over Voice
over IP, Voice over Frame Relay, or Voice over ATM.
A DTE interface through which a command enters a host
Stands for Class of Service. CoS refers to the standard method that enables a higher-level
protocol to make a lower-level protocol process messages. For the SNA lower-level area
routing, CoS is used to determine the optional path for lower-level area nodes to set a given
session. CoS consists of a virtual path number and a transmission priority field. Also called
ToS
Decryption means restoring data to the original non-encrypted state by applying the
encryption algorithm to the encrypted data in reverse.
Stands for Dynamic Host Configuration Protocol. DHCP has a mechanism that reassigns an
IP address dynamically in order for the host to recycle unnecessary IP addresses.
Stands for Domain Name Server. This is a server system used for the Internet to convert the
name of a network node name to an address.
Stands for Digital Signal level 3. This is a frame processing standard used to transmit
digital signals at a rate of T3 (44.736Mbps).
Stands for Digital Signal Processor. This is a dedicated processor that processes only digital
signals. DSP is used as a sub-processor for voice processing in NEXT.
Stands for Dual Tone MultiFrequency. Two voice-band tones are simultaneously used for
dialing (just like touch tones).
Stands for either recEive and transmit or Ear and Mouth. Typically, this is a trunking device
used for switch-to-switch or switch-to-network two-way communications. The analog
E&M interface of Cisco is a RJ-48 connector for PBX trunk lines. E&M is available for
E1/T1 digital interfaces.
This is a wide area digital transmission technique used mainly in Europe. E1 enables data
transfer at a rate of 2,048Mbps. E1 can be lent by regular service providers for a private
use.
Encryption means that a specific algorithm is applied to data in order to convert data to a
form that unauthorized users cannot identify.
Baseband LAN standard initiated by Xerox Corporation and co-developed by Xerox, Intel,
and DEC. CSMA/CD is used for Ethernet networks, which operate through a variety of
cables at a rate of 10Mbps. Ethernet is similar to the IEEE 802.3 standard. Refer to 10Base-
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