B8ZS - Bipolar with eight zero substitution
Clear channel line coding option on DS-1 service
allows the DS-1 user to obtain greater
functionality from their DS-1 facilities. The use of B8ZS allows users
transmit data at a rate of 64 Kbps per DS-0,
achieving what is referred to as a clear channel.
Applied against all 24 DS-Os on a DS-1, the effective
data throughput of the DS-1 facility is
with B8ZS from 1.344 Mbps to 1.536 Mbps, a 14% increase in throughput. CSUs
with B8ZS support are required on both ends of
the user's circuit.
A high-capacity network of
broadband connections between switches.
A release form that authorizes a
customer's long-distance phone service to be switched to
(another) long-distance carrier, or reseller.
BAN - Billing Account Number
telephone companies to designate a billing account, i.e., a customer or
location that receives a bill. A
customer may have any number of BANs.
A measure of the communication
capacity or data transmission rate of a circuit. The total
frequency spectrum (in Hertz - cycles per
second) that is allocated or available to a channel,
or the amount of data that can be carried (in bits per second) by a
The non discounted
"per minute" charge for Measured Service.
Basic Rate Interface - BRI
that allows 2 64 Kbps and 1 16 Kbps channels to be carried over 1 typical
pair of copper wires. This is the type
of service that would be used to connect a small branch
or home office to a remote network. Through the use
of BONDING (Bandwidth on Demand) the
Kbps channels can be combined to create more bandwidth as it becomes
3 digital signals over a single pair of
copper wires: 2 voice (B) channels and 1 signaling (D) channel.
(e.g. voice and fax on a single pair of wires)
Currently ELI does not sell this service.
A system that groups
input into "batches" and processes them periodically (rather than
The number of signaling elements that
can be transmitted per second on a circuit. e.g. When a
modem is used to send digital information on an
analog line, baud refers to the speed that the circuit
can change from the tone used to represent a
binary zero to the tone used to represent a binary one
(or vice versa). In an average data stream, one baud
is roughly equivalent to one bit per second on a
digital transmission circuit. (This is an older term
being replaced by bps - bits per second.)
B Channel - Bearer Channel
64 Kbps digital channel specified in the ISDN standards, and used for
transmission of speech, freeze-frame
video and data. Can be circuit switched or packet switched.
Bell Customer Code
A three-digit numeric
code, appended to the end of the Main Billing Telephone Number, that is
used by Local Exchange Carriers to provide
unique identification of customers.
Bell Operating Company - BOC
The local (or
regional) telephone company that owns and operates lines to customer
and Class 5 Central Office Switches.
BOCs have connections to other COs, Tandem (Class 4 Toll)
offices and may connect directly to IECs like
AT&T, MCI, Sprint, WorldCom, etc. BOC may refer to
the nineteen Bell Operating Companies that are owned
by the seven RHCs (Regional Holding Companies)
(not including Cincinnati Bell or Southern New England Telephone). The BOC
role was originally defined
by the 1982
Modified Final Judgment that specified the terms of the AT&T
Divestiture). For Example,
the three BOCs:
Mountain Bell, Northwestern Bell and Pacific Northwest Bell are owned by the
U.S. West RHC. Each BOC may service more than
one LATA, but BOCs are generally constrained
providing long distance service between LATAs.
A secondary product test
performed by a selected set of "early support" end user(s) or
(under special contract) prior to
the general availability of the product.
Notice of charges for products
and services rendered
BICSI - Building Industries Consulting Service International
A non-profit professional association for those
engaged in voice\data cable plant design and
installation. Administers the Registered Communications Distribution
Designer (RCDD) and LAN
Specialist certifications and
provides related training.
BISDN - Broadband Integrated Services Digital Network
A packet switching technique which uses packets of
fixed length, resulting in lower processing
higher speeds. Also see ATM or Cell RelaY. In ISDN, a high-speed
network standard that
evolved narrowband ISDN with
existing and new services with voice, data and video in the same
BISUP - Broadband ISDN User's Part
protocol which defines the signaling messages to control connections and
The smallest amount of information that
can be transmitted. In binary digital transmission, a bit has
one of two values: 0 or 1. A combination of
bits can indicate an alphabetic character, a numeric digit,
or perform a signaling, switching or other function.
Bit Error Rate - BER
at which errors occur in a stream of transmitted data. The BER may be
expressed in terms
of a percentage of
error-free seconds or as a percentage of error-free bits.
Prevent calls from completing
to the requested destination. May be due to network problems
(outage, overload, etc.), or by customer
request (e.g. block calls from-or-to certain NPAs,
NXXs, States, LATAs, etc.).
An interactive signal that
prompts the originating end user to enter additional information.
A system capacity
constraint that may reduce traffic during peak load conditions.
bps - bits per second
(upper/lower case is significant)
Bps - (8-bit) bytes per second
A LAN internetworking device or
setup that filters and passes data between two network segments
(LANs), based on the destination field information in
the packet header. Bridges do not use any
A high-capacity communications
circuit/path. A term describing any network that multiplexes
multiple, independent network carrier
frequencies on to a single cable. It usually implies a speed
greater than 1.544Mbps
Broadband Connection Oriented Bearer - BCOB
Information in the SETUP message that indicates the type of service
requested by the calling user.
Used in ATM for
multiple Classes (i.e. BCOB-A, BCOB-C, BCOB-X).
A term used by some vendors,
normally referring to a bridge also having some of the characteristics
of a router.
BTN - Billing Telephone Number
phone number associated, for billing purposes, with the Working Phone
A combined pricing of hardware,
software and related services. OR The pricing of a group of
components or elements of a communications product or
service, so that the customer may choose
the group of
items at a less expensive price than if the components were chosen
Bursty -- Batchy
characterized by high volumes of data transmitted intermittently, as opposed
Butt-set, butt-in, buttinski
test telephone used to monitor, dial, and talk on conventional analog
So named because the craft
person could clip onto a wire pair and "butt in" to a
The use of facilities other
than those of the LEC (Facilities Bypass) or the use of operating telephone
company private lines (Service Bypass) to
connect a customer premise to a PoP or another customer
A set of bits that represent a single
character. Usually there are 8 bits in a byte - sometimes more
depending on how the measurement is being made. The
ASCII standard is seven information bits and
parity bit for error checking.