User guide

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MOCET IP3092/IP3092L Communicator User Guide
10.2. Terminology
10/100BASE-T
It is a LAN transmission line specification stipulated by IEEE.
Transmission speed is 10 or 100 Mbps and the modulation technique
is base-band modulation. The cable uses unshielded twisted pair,
similar to a telephone wire. 10BaseT is an IEEE standard (802.3) for
operating 10 Mbps Ethernet networks (LANs) with twisted pair
cabling and a wiring hub.
802.1p
An IEEE standard for providing QoS using three bits (defined i
n
802.1q) to allow switches to reorder packets based on priority level.
802.1q
An IEEE standard for providing virtual LAN (VLAN) identification and
QoS levels. Three bits are used to allow eight priority levels, and 12
bits are used to identify up to 4,096 VLANs.
AGC
Automatic Gain Control is a feature of IP solutions units that allows
the units to automatically adjust the incoming voice signal to a user
defined level in dBm.
A-law The PCM coding and compression standard used in Europe and in
areas outside of North America influence. A Law Encoding is the
method of encoding sampled audio waveforms used in 2.048Mbps,
30 channel PCM primary system known as E-carrier.
Auto answer In telephone call control: The capability of a machine to answer a
ringing telephone without human intervention.
Autodial In telephone call control: An auxiliary device for a telephone that
automatically dials any of a group of prerecorded telephone
numbers.
Blocked Calls Caused by an insufficient network facility that does not have enough
lines to allow calls to reach a given destination. May also pertain to a
call from an originating number that is blocked by the receiving
telephone number.
Call Completion The point at which a dialed number is answered.
Call Termination The point at which a call is disconnected.
CDR In telephone call control: Call Detail Record for billing
IP Centrex
This service is offered by the LEC to the end user. The feature-rich
Centrex line offers the same features and benefits as a PBX to a
customer without the capital investment or maintenance charges.
The LEC charges a monthly fee to the customer, who must agree to
sign a term agreement. And the abive service is thru VoIP called IP
centrex.
CO Switching center for the local exchange carrier.
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.