Axxius 800 User Manual

Glossary - 2 Axxius 800 - Release 2.2
Glossary
authorization
authorization The process of granting or denying access to a network resource. Most
computer security systems are based on a two-step process, sometimes
more. The first stage is authentication, which ensures that a user is who
he or she claims to be and in some cases, that the user is not already on
the system. The second stage is authorization, which allows the user
access in varied degrees to various resources based on the preassigned
privileges associated with the user’s identity.
B-channel Short for Bearer-channel, the main data channel in an ISDN connection.
Basic Rate ISDN (BRI) service consists of two 64 Kbps B-channels, and
one D-channel for transmitting control information.
B8ZS Bipolar 8-Zero Substitution, a coding scheme that maintains ones
density.
backplane A common bus at the rear of the computer chassis connecting each circuit
card slot to the other parts of the system. Motherboards on modern PCs
are a general equivalent. It also distributes low-voltage AC and DC,
filtered and un-filtered power to each slot.
bandwidth The amount of data that can travel through a channel in a given period of
time. Bandwidth is usually measured in cycles per second (hertz) or in
bits per second (BPS). The larger the bandwidth, the more information
the network can handle. ISDN is usually 64KB, 128KB or 256KB.
ASDL and DSL are generally faster than ISDN and sometimes faster
than cable. Cable connections are usually 500KB or 1MB. T1 is 1.5MB
and T3 is 45MB.
Basic Rate
Interface (BRI)
Basic Rate Interface is an Integrated Services Digital Network (ISDN)
interface typically used by smaller sites and customers. This interface
consists of a single 16 Kbps Data (or "D") channel plus 2 Bearer (or "B")
channels for voice and/or data.
BER Bit Error Rate, the number of erred bits divided by the total number of
bits.
BERT Bit Error Rate Tester