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Glossary A
Glossary
2B+D
The Basic Rate Interface (BRI) in ISDN. A single ISDN circuit is divided into two
64kbps digital channels for voice or data and one 16kbps channel for low speed data
and signaling. In ISDN, 2B+D is carried on one or two pairs of wires (depending on
the interface), the same wire pairs that today bring a single voice circuit into your
home or office.
10BaseT
The 10-Mbps baseband Ethernet specification that uses two pairs of twisted-pair
cabling (Category 3 or 5): one pair for transmitting data and the other for receiving
data.
Analog
An electrical circuit that is represented by means of continuous, variable physical
quantities (such as voltages and frequencies), as opposed to discrete
representations (like the 0/1, off/on representation of digital circuits).
ANSA
(Alternate Network Service Agreement): Under ANSA, customers who reside in areas
where the central office switch does not support ISDN can be serviced from a
neighboring central office at no additional charge. From the customer's perspective,
ISDN is readily available and affordable, but the customer MUST agree to migrate to
the local central office if and when service becomes available. In most cases this
involves a change in phone number. This agreement pertains to Bell South
customers only.
Architecture
A design. The term architecture can refer to either hardware or software, or to a
combination of hardware and software. The architecture of a system always defines
its broad outlines, and may define precise mechanisms as well.
ARP
Address Resolution Protocol is a protocol for mapping an Internet Protocol address
(IP address) to a physical machine address that is recognized in the local network.
AT&T 5ESS A digital central office switching system made by AT&T.
Authenticity Proof that the information came from the person or location that reportedly sent it.
One example of authenticating software is through digital signatures.
Backbone
A high-speed line or series of connections that forms a major pathway within a
network.
Bandwidth
This is the capacity on a link usually measured in bits-per-second (bps).
B Channel
This is an ISDN communication channel that bears or carries voice, circuit or packet
conversations. The B-channel is the fundamental component of ISDN interfaces. It
carries 64,000 bits per seconds in either direction.
Bit
(Binary Digit) – A single digit number in base-2, in other words, either a one or a zero.
The smallest unit of computerized data.
BRI
(Basic Rate Interface): The most common kind of ISDN interface available in the US.
BRI contains two B channels, each with 64 kbps capacity, and a single D channel (16
kbps) which is used for signaling and call progress messages.
Byte
A set of bits that represent a single character. There are 8 bits in a Byte.