Lucent Technologies PacketStar PSAX DS1/E1/DS0A CES Module User Manual page 162

Glossary
AW
B
B channel
B8ZS
backbone
backhauling
backplane
backward direction rate
bandwidth
bandwidth classification
base station
basic rate interface
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PSAX 12-Port Medium-Density DS1/E1/DS0A CES Module User Guide (DS1 Mode), Issue 1
PacketStar
Glossary-6
administrative weight. This parameter allows network archi-
tects to indicate relative link preference when deciding
between alternate routes.
A channel that carries 56-Kbps or 64-Kbps of user data on a
line using ISDN D-channel signaling.
bipolar 8-zero substitution. This encoding scheme is used for
transmitting data bits over T1 transmission systems. This
scheme is "smarter" than the B7ZS scheme, because it trans-
parently adds a one-bit as needed to ensure that no more
than seven zero-bits are ever transmitted in a row. However,
unlike the B7ZS scheme, the B8ZS scheme provides a "clear
channel" capability, which allows each of the 24 channels to
carry 64 Kbps of data.
The portion of a communications network that carries the
heaviest traffic and employs high-speed transmission path-
ways. In a wide area network (WAN), the backbone is that
portion that links all the individual local area networks
(LANs) together.
A technique in which data traffic is transmitted beyond its
endpoint and back to its endpoint. In fiber-optic data trans-
mission, backhauling is a traffic management technique used
to diminish the cost of multiplexing and demultiplexing.
A circuit board in a chassis in which various modules or com-
ponents are connected on one side to the central processing
unit. Typically, a backplane runs at a very high capacity band-
width, and carries a high number of connections, addressing
information, and signaling. A backplane is also sometimes
called the backplane bus. Also see midplane.
This rate is the rate of speed data transmissions take as they
move toward the head-end of a broadband LAN.
The amount of data a channel can transmit in a given period
of time. Bandwidth is measured in bits (not bytes) per second
on digital networks, while on analog networks, it is measured
in Hertz (cycles per second).
The types of bandwidth are narrowband, wideband, and
broadband, and are used to describe the capacity of a commu-
nications channel. Narrowband
number of 64 Kbps channels (Nx64) and provides aggregate
bandwidth less than 1.544 Mbps (24x64 Kbps, or T1 rate).
Wideband is 1.544 Mbps to 45 Mbps (T1 to T3 rate), while
broadband operates at 45 Mbps (T3 rate) or higher.
In a wireless communication, the base station receives and
transmits all calls in its cell to the MSC, which is located out-
side the cell (also see MSC).
See BRI.
generally refers to some
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