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ISDN Software Reference for Linux and Windows
452
established, the application can transmit user-to-user messages using the
CRN associated with the NCAS call. An ISDN feature that supports
the 5ESS protocol.
Network Facility Associated Signal (NFAS)
Allows multiple spans to be
controlled by a single D channel subaddressing.
NULL
A call state in which no call is assigned to the device (line or time
slot).
PRI
Primary Rate Interface
Primary Rate Interface
A standard digital telecommunication service,
available in many countries and most of the United States, that allows
the transfer of voice and data over T-1 or E-1 lines. The T-1 ISDN
Primary Rate protocol consists of 23 voice/data channels (B-channels)
and one signaling channel (D-channel). The E-1 ISDN Primary Rate
protocol consists of 30 voice/data channels, one signaling channel (D-
channel), and one framing channel to handle synchronization.
PSTN
Public Switched Telephone Network
Public Switched Telephone Network
An abbreviation used by the
CCITT. Refers to the worldwide telephone network accessible to all
those with either a telephone or access privileges.
SAPI
Service Access Point Identifier
SCbus
The TDM (Time Division Multiplexed) bus connecting SCSA
(Signal Computing System Architecture) voice, telephone network
interface, and other technology resource boards together.
SIT
Special Information Tone
SpanCard
See DIALOG/HD.
Special Information Tone
Detection of an SIT sequence indicates an
operator intercept or other problem in completing the call.
SPID
Service Profile Interface ID
SRL
Standard Runtime Library
Standard Runtime Library
A Dialogic software resource containing Event
Management and Standard Attribute functions and data structures used
by all Dialogic devices, but which return data unique to the device.