ISO IEC 17311 pdf download – Information technology — Telecommunications and information exchange between systems — Private Integrated Services Network — Mapping functions for the employment of 64 kbit/s circuit mode connections with 8 kbit/s sub-multiplexing
1Scope
This International Standard defines the mapping functions in exchanges of Private Integrated Services Networks (PISNs)required for the uilization of scenarios in which 64 kbits circuit mode connections are sub-multiplexed into onc l6 kbitschannel for carrying inter-PINX signalling and 6 x 8 kbit/s channels for carrying inter-PINX user information.
NOTE 1 -This Ilnternational Standard has been prepared to meet the specific needs of an application for a particular user organisation.However, it may also be applicable elsewhere.
In order to connect a Private Integrated Services Network Exchange (PINX) to another PINX, mapping functions are requiredto adapt the specific interfaces at the C reference point to the application at the Q reference point.As such, mapping functionsprovide for physical adaptation to the interface at the C reference point.Mapping functions also provide for the mapping ofuser channels and signalling information at the Q reference point to the appropriate channels or timeslots at the C referencepoint.
The C and Q reference points are defined in ISO/IEC 11579-1.
The type of interface at the C reference point covered by this International Standard is the 64 kbit’s Unrestricted Digital LeasedLine (D64U) Terminal Equipment Interface, in accordance with ITU-T Rec.G.703.
At the Q reference point the mapping provides an 8 kbitls service for user channels to support the transfer of unrestricteddigital information and to support the transfer of speech, and a l6 kbit’s packet mode service for the signalling channel. Theapplied mapping is a static mapping, i.e. there is a fixed relationship between user and signalling channels at the Q referencepoint and the interface at the C reference point.
Management functions relating to failure management are outside the scope of this International Standard.
This International Standard is applicable to PINXs that can be interconnected to form a Private Integrated Services Network(PISN) and that support signalling protocols at the Q reference point.
2Conformance
In order to conform to this International Standard, a PINX shall satisfy the requirements identified in the ImplementationConformance Statement (ICS) proforma in annex A.
3 Normative references
The following normative documents contain provisions which, through reference in this text, constitute provisions of thisInternational Standard. For dated references，subsequent amendments to, or revisions of, any of these publications do notapply.However,parties to agreements based on this International Standard are encouraged to investigate the posibility ofapplying the most recent editions of the normative documents indicated below.For undated references, the latest edition of thenormative document referred to applies. Members of ISO and IEC maintain registers of currently valid International Standards.ISOIEC 11579-1:1994, Information technology —Telecommunications and information exchange between systems —PrivateIntegrated Services Network – Part l : Reference configuration for PISN exchanges (PINX).
ITU-T Rec.G.703:1998, Physical / electrical characteristics of hierarchical digital interfaces.
ITU-TRec. Q.920:1993, Digital Subscriber Signalling System No. 1 (DSSI)— ISDN user-network interface data link layer —General aspects.
ITU-T Rec.Q.920 Am. 1:2000,Amendment 1 to rTU-T Recommendation Q.920.ITU-T Rec. Q.921:1997,ISDN user-network interface — Data link layer specification.ITU-T Rec.Q.921 Am. 1:2000,Amendment l to rTU-T Recommendation Q.921.
ITU-T Rec.1.112:1993,Vocabulary of terms for 1SDNs.
ITU-T Rec. 1.460:1999, Mulriplexing. rate adaption and support of existing interfaces.
NOTE2-This lnternational Standard also contains informative references.Details of these publications are given in annex B.
4Definitions
4.1 External definitions
For the purposes of this International Standard, the following external definitions apply.- Integrated Services Digital Network
(CCITT Rec. 1.112)
– Private Integrated Services Network
(ISOIEC 11579-1)
– Private Integrated Services Network Exchange
(ISO/IEC 11579-1)
4.2Special definitions
4.2.1 Channel : A means of bi-directional transmission of user or signalling information between two points.
4.2.1.1 Dg-Channel : A channel used to convey call control information between the Q reference points of two peer PINXs.4.2.1.2 Uo-Channel : A channel used to convey user information between the Q reference points of two PINXs.
4.2.2 End PINX : In the context of :a particular call, a PINX to which one of the users is attached (Originating PINX orTerminating PINX) or a PINX at which signalling interworking occurs (Gateway PINX).
4.2.3 Inter-PINX Connection : A comnection provided by an IVN between two C reference points used to transport inter-PINX information from the PISN control plane and/or the PISN user plane.
4.2.4 Inter-PINX Link : A link between the Q reference points of two PINXs, comprising the totality of signalling transferand user information transfer means.
4.2.5Transit PINX : In the context of a particular call, any PINX, excluding the End PINXs, through which the call passes.
5 Abbreviations
ICS
lmplementation Conformance Statement
IPC
Inter-PINX Connection
IPL
Inter-PINX Link
ISDN
Integrated Services Digital Network
MP
MaPping functional grouping
PINX
Private Integrated Services Network Exchange
PISN
Private Integrated Services Network
6Introduction
This International Standard specifies mapping functions for the following scenario:
– Dedicated 64 kbit/s circuit mode connection sub-multiplexed to provide 8 kbit’s user information channels.
This scenario consists of a dedicated 64 kbits circuit mode connection in a point-to-point configuration, and offering at the Creference point an interface with a single 64 kbits channel.This 64 kbit/s channel is sub-multiplexed by the Mapping (MP)functional grouping into one l6 kbit/s signalling channel and 6 x 8 kbit/s user information channels.
NOTE 3 – Where a user information channel is used for carrying speech, a speech compression function is required. This is provided by theswitching (swy functional grouping-
ISO IEC 17311 pdf download – Information technology — Telecommunications and information exchange between systems — Private Integrated Services Network — Mapping functions for the employment of 64 kbit/s circuit mode connections with 8 kbit/s sub-multiplexing
