ISDN, a 64Kbps, full duplex
channel See: D Channel,
Usually refers to a telephone company's main
inter-network. A high-speed line or series of connections that forms a
major pathway within a network. The term is relative as a backbone in a
small network will likely be much smaller than many non-backbone lines
in a large network.
How much 'stuff' you can send through a connection.
Usually, but not necessarily measured in
(bits-per-second). A full page of English text is about 16,000 bits. A
fast dial-up modem can move about 33,000 bits in one second. Full-motion
full-screen video would require roughly 2.5Mbps, depending on
compression methods. When measuring Throughput, do not confuse BPS with
CPS (Characters-per-second) See: Bit
Usually confused with BPS (Bits Per Second). In
common usage, the baud rate of a modem is how many bits it can send or
receive per second. Technically however, baud is the number of times per
second that the carrier signal shifts value - each shift represents an
amount of data. Different technologies, improve the number of bits per
baud (shifts) - for example a 1200 bit-per-second modem actually runs at
300 baud, but it moves 4 bits per baud (4 x 300 = 1200 bits per second).
BER (Bit Error Rate) --
The rate at which modems product errors. To be correctly stated, BER's
must be associated with amount of noise and other impairments on the
lines which the modem is being tested. The test must be associated with
Signal to Noise Ratio (SNR)
Bit (Binary digIT)
-- A single digit number in base-2, in
other words, either a 1(one) or a 0(zero). The smallest unit of
is usually measured in bits-per-second.
BORSHT functions --
Acronym for: "Battery feed, Overvoltage protection, Ringing,
Supervision, Hybrid, and Test." These features are
basic elements for proper telephone equipment operation that is provided
by the Central Office. Devices such as
must also provide BORSHT functions.
Bps (Bits-Per-Second) --
A measurement of how fast data is moved from one place to another. A
28.8Kbps modem can move 28,800 bits per second, 56K moves 56,000 bits
per second, etc.
BRI (Basic Rate Interface)
-- Refers to the two 'B' (2B) channels
of 64Kbps each, totaling 128Kbps when using 'bonding' or 'ML-PPP'
(Multi-Link Point to Point Protocol), used in ISDN See:
- In regard to 'last mile' data
communications, refers to data speeds greater than 'dial-up' modems.
Usually refers to Mega-bit speeds. Examples are; ADSL, Cable, and newer
wireless technologies. ISDN with speeds of 64kbps and 128kbps are
normally not considered broadband technology.
A set of consecutive data its that represent a
single character. Usually there are 8
in a Byte.
Asynchronous transmission frames each byte
with a Start and a Stop bit, making asynchronous data typically 10 bits
per byte. The Internet runs on Asynchronous data. It is less efficient