Some Definitions of
Conferencing Terms
Definitions of some conferencing terms provided by
AskJeeves at www.ask.com and other sources . .
.
Frame
Relay
|
Last modified: Monday, November 17, 1997 |
|
|
A
packet-switching
protocol
for connecting devices on a
Wide Area Network (WAN). Frame Relay networks in the U.S. support data
transfer rates at T-1 (1.544
Mbps) and T-3
(45 Mbps) speeds. In fact, you can think of Frame Relay as a way of
utilizing existing
T-1 and
T-3
lines owned by a service provider. Most telephone companies now provide
Frame Relay service for customers who want connections at 56 Kbps to T-1
speeds. (In Europe, Frame Relay speeds vary from 64
Kbps to 2 Mbps.
In the U.S., Frame Relay is quite popular because it is relatively
inexpensive. However, it is being replaced in some areas by faster
technologies, such as
ATM |
T-1
carrier
|
Last modified: Wednesday, January 09, 2002 |
|
|
A dedicated phone connection supporting data rates of 1.544Mbits per
second. A T-1 line actually consists of 24 individual
channels,
each of which supports 64Kbits per second. Each 64Kbit/second channel can be
configured to carry voice or data traffic. Most telephone companies allow
you to buy just some of these individual channels, known as fractional
T-1 access.
T-1 lines are a popular
leased line
option for businesses connecting to the
Internet
and for Internet
Service Providers (ISPs) connecting to the Internet
backbone.
The Internet backbone itself consists of faster
T-3
connections.
T-1 lines are sometimes referred to as DS1 lines. |
V.35
|
Last modified: Tuesday, March 12, 2002 |
|
|
An ITU
standard for high-speed synchronous data exchange. In the U.S., V.35 is the
interface standard used by most
routers and
DSUs that
connect to
T-1 carriers. |
The V.35 interface is typically found on DTE and DCE equipment interfacing to
high speed digital carrier services. V.35 interface has been around for quite
some time and was originally designed for a 48K bps modem but it has been shown
to cope speeds up to 2 Mbit/s and even faster. This interface is most often used
with equipment which connect data circuits to syncronous telecommunication
network and with some fixed line modems.
V.35 no longer exists as a ITU standard. It has been replaced by V.10/V.11.
You can still though see references to this interface. V.35 was specified to use
a 37 pin connector (the chunkiest in the world). Nowadays for high speed serial
connections (that use the term V.35) most manufacturers use a DB25 connector
with EIA/TIA RS-530A standard pinout or a non-standard pinout.
Introductory videos on
Polycom ViewStation V.35 installation and cable options.
Last modified:
20 October, 2010
|
