MOCET IP3072 - Manual (Page 74)

Page 74
MOCET IP3072 Smart Office IP Desk Phone User Guide
CODEC The CODEC (CODER/DECODER) is a standard through which
voice information can be encoded into data or decoded back to
voice information. Both a Coder and Decoder are necessary on
both sides of the telephone call since telephone calls occur
simultaneously in both directions. Bandwidth is an extremely
important factor in QOS (Quality of Service). MOS (Mean Opinion
Score) is an attempt to make a quantifiable benchmark of voice
quality. Below are examples of the CODEC, bit rate and mean
opinion score: G.711 (toll quality) 64K MOS=4.1, G.726 16K (32K)
MOS =3.8, G.729AB (cell phone quality) 8K MOS=3.7.
Customer
Premise
Equipment The only part of the telecommunications system that the customer
comes into direct contact with. Example of such pieces of
equipment are: telephones, key systems, PBXs, voicemail
systems and call accounting systems as well as wiring telephone
jacks. The standard for this equipment is set by the FCC, and the
equipment is supplied by an interconnect company.
DHCP A utility that enables a server to dynamically assign IP addresses
from a predefined list and limit their time of use so that they can
be reassigned. Without DHCP, an IT Manager would have to
manually enter in all the IP addresses of all the computers on the
network. When DHCP is used, whenever a computer logs onto the
network, it automatically gets an IP address assigned to it.
DID Direct Inward Dialing: The ability to make a telephone call directly
into an internal extension without having to go through the
operator.
Diff-Serv Differentiated Services : The Diff-Serv model divides traffic into a
small number of classes to provide quality of service (QoS). One
of QoS in internet
Direct inward
dialing A Centrex feature that allows an outside caller to dial a central
business number, as well as an extension number.
Diversity antenna A type of antenna system that uses two antennas to maximize
reception and transmission quality and reduce interference.
DNS Domain Name Service : A server/program that translates URLs to
IP addresses by accessing a database maintained on a collection
of Internet servers. The program works behind the scenes to
facilitate surfing the Web with alpha versus numeric addresses. A
DNS server converts a name like mywebsite.com to a series of
numbers like 107.22.55.26. Every website has its own specific IP
address on the Internet. Typically one or more DNS servers is
located in an IP network.
DSL Various technology protocols for high-speed data, voice and video
transmission over ordinary twisted-pair copper POTS (Plain Old
Telephone Service) telephone wires.