Software Specifications Signaling Control
Centillion 1200N ATM Switch User Manual 5-3
NTP 297-8103-903
Signaling Control
SVC connections provided by the ATM Switch are prepared by a protocol called
signaling that establishes and releases SVCs.
The signaling protocol is used by the calling terminal to notify the network of the
destination of the established SVC, communication band, and traffic quality.
The signaling protocols supported by the ATM Switch are as follows:
■ITU-T recommendation draft Q.2931 at the May 1993 meeting of the ITU-T
Study Group II.
■ATM Forum UNI 3.0 based on Q.SAAL1 (SSCOP) of ITU-T Study Group 1 1
Document DT/11/3-28.
■ATM Forum UNI 3.1
■ATM Forum UNI 4.0
The addresses that can be used for signaling are:
■Address format E.164.
■NSAP incorporated ATM private network address defined by ATM Forum.
■Besides UNI, the ATM Switch also supports routing function and signaling
function conforming to ATM Forum PNNI 1.0. Consequently, a signaling
request may be routed through a network composed of more than one switch.
■Control layer AAL5 (ATM Adaptation Layer 5) called "C plane" is used to
convey the signaling request.
Figure 5-2 shows the protocol stack of the C plane.

Figure 5-2: Protocol Stack of C plane