Snom ONE IP, Техническое руководство

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snom ONE • Administrator Guide, Release 5
536
Bandwidth
The range from highest to lowest frequencies transmitted on a network. Band-
width measures network capacity.
BLF (Busy Lamp Field)
A collection of lights or indicators on a phone that allows users to monitor the
dialog state of another phone/user extension. This is indicated by the LEDs adja-
cent to the particular key. BLFs are often used by receptionists and secretaries to
aid in routing incoming calls.
BRI (basic rate interface)
An ISDN interface that consists of two 64 kb B-channels and a 16 kb signaling
channel. Defined by the ITU (International Telecommunication Union) in the
I.430.
Broadcast
A transmission mode in which a station sends a message to all stations on a net-
work. For example, an authorized user of the voicemail system might broadcast
a message to all the phones on a particular domain to advise users of scheduled
downtime for system maintenance.
CALEA (Communications Assistance for Law Enforcement Act)
A U. S. wiretapping law passed in 1994 to protect public safety and ensure
national security. Its objective is to preserve law enforcement’s ability to conduct
lawfully-authorized electronic surveillance while preserving public safety, the
public’s right to privacy, and the telecommunications industry’s competitiveness.
The law defines the existing statutory obligation of telecommunications carriers
to assist law enforcement in executing electronic surveillance pursuant to court
order or other lawful authorization.
CAS (content-addressed storage)
A mechanism for storing information that is in its final form (the object cannot
be duplicated or modified once it has been stored). CAS assigns an identifier to
the files so that they can be retrieved based on its content, rather than on their
storage location. It is typically used for storing mortgage records, insurance poli-
cies, health records, and emails.