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INTERNATIONAL TELECOMMUNICATION UNION
ITU-T RECOMMENDATION SUMMARY
Rec. No. : I.233.1
Title : ISDN Frame relaying bearer service
Study Group : XVIII - ISDN
Version : New
Date of adoption : 1991
Notes : Published with I.233
Recommendation I.210 describes the principles for defining
telecommunication services supported by an ISDN including the concept
of bearer services, teleservices and supplementary services. It also
provides the means for the definition and description of such
services. The purpose of Recommendation I.233.1 is to describe the
frame relaying bearer service and to recommend the method of its
provision in an ISDN. The definition and description of this service
form the basis to define the network capabilities required for the
support of the service in an ISDN. According to Recommendation I.210 a
stage 1 service description uses three steps: prose description,
static description and dynamic description. These steps are used in
Recommendation I.233.1.
The frame relaying bearer service provides the bidirectional transfer
of service data units (SDU) from one S or T reference point to
another with the order preserved. The service data units are routed
through the network by appropriate layer 2 PDUs on the basis of an
attached label. This label is a logical identifier with local
significance [termed DLCI (data link connection identifier) in the
protocol description].
The user network interface structure at the S or T reference point
allows for the establishment of multiple virtual calls and/or
permanent virtual circuits to many destinations. This service is
generally available on the following ISDN access arrangements:
point-to-multipoint (passive bus) and point-to-point (NT2).
To order the complete text of this Recommendation, please use the
Order Form for ITU-T Recommendations. An electronic version of this
form is available on ITUDOC (Winword 2.0: UPI=ITU-5265; ASCII: UPI=ITU-2488).