1、Standard ECMA-226June 1995Standardizing Information and Communication SystemsPhone: +41 22 849.60.00 - Fax: +41 22 849.60.01 - URL: http:/www.ecma.ch - Internet: helpdeskecma.chPrivate Integrated ServicesNetwork (PISN) -Mapping Functions for theEmployment of DedicatedCircuit Mode Connections asInter
2、-PINX ConnectionsStandard ECMA-226June 1995Standardizing Information and Communication SystemsPhone: +41 22 849.60.00 - Fax: +41 22 849.60.01 - URL: http:/www.ecma.ch - Internet: helpdeskecma.chIW - ECMA-226.DOC - 08.07.96 15,20Private Integrated ServicesNetwork (PISN) -Mapping Functions for theEmpl
3、oyment of DedicatedCircuit Mode Connections asInter-PINX Connections(MAPPING-CM-STATIC)Brief HistoryThis Standard is one of a series of ECMA standards defining mapping functions in exchanges of Private Integrated ServicesNetworks required for the utilization of intervening network scenarios. The ser
4、ies uses the ISDN concepts as developed byITU-T (formerly CCITT) and is also within the framework of standards for open systems interconnection as defined by ISO.This Standard specifies mapping functions for the type of scenario where two PINXs are interconnected via DedicatedTransmission Systems an
5、d/or Cross Connect Systems.The Standard is based upon the practical experience of ECMA member companies and the results of their active andcontinuous participation in the work of ISO/IEC JTC1, ITU-T, ETSI and other international and national standardizationbodies. It represents a pragmatic and widel
6、y based consensus.This ECMA Standard has been adopted by the ECMA General Assembly of June 1995.- i -Table of contentsPage1 Scope 12 Conformance 13 References 14 Definitions 24.1 External definitions 24.2 Special definitions 24.2.1 Channel 24.2.1.1 DQ-Channel 24.2.1.2 UQ-Channel 24.2.2 Inter-PINX Co
7、nnection 24.2.3 Inter-PINX Link 25 Abbreviations 36 Introduction 37 Capabilities at the Q reference point 38 Mapping functions 48.1 Physical adaptation 48.1.1 ISDN 2048 kbit/s Primary Rate User-Network Layer 1 Interface 48.1.2 ISDN Basic User-Network Layer 1 Interface 48.1.3 2048 kbit/s Digital Stru
8、ctured Leased Line (D2048S) 58.1.4 2048 kbit/s Digital Unstructured Leased Line (D2048U) 58.1.5 64 kbit/s Unrestricted Digital Leased Line (D64U) 58.2 Mapping Matrix 68.2.1 Channel allocation 68.2.1.1 ISDN 2048 kbit/s Primary Rate User-Network Layer 1 Interface 68.2.1.2 ISDN Basic User-Network Layer
9、 1 Interface 68.2.1.3 2048 kbit/s Digital Structured Leased Line (D2048S) 78.2.1.4 2048 kbit/s Digital Unstructured Leased Line (D2048U) 78.2.2 Bearer Conditioning for the DQ-channel 7Annex A - Implementation Conformance Statement (ICS) Proforma 9Annex B - Bibliography 171 ScopeThis Standard defines
10、 the mapping functions in exchanges of Private Integrated Services Networks (PISNs) requiredfor the utilization of intervening network (IVN) scenarios which provide dedicated circuit mode connections forcarrying inter-PINX signalling and user information.In order to connect a Private Integrated Serv
11、ices Network Exchange (PINX) to another PINX, mapping functions arerequired to adapt the specific interfaces at the C reference point to the application at the Q reference point. As such,mapping functions provide for physical adaptation to the interface at the C reference point. Mapping functions al
12、soprovide for the mapping of user channels and signalling information at the Q reference point to the appropriatechannels or timeslots at the C reference point.The C and Q reference points are defined in ISO/IEC 11579-1.The types of interfaces at the C reference point covered by this Standard are:1)
13、 2048 kbit/s Primary Rate User-Network Layer 1 Interface, in accordance with ETS 300 011 including therequirements for the “Application of the ETS 300 011 for PTNX interconnections“ as contained in ETS 300 011Annex A2) Basic User-Network Layer 1 Interface, in accordance with ETS 300 012, excluding t
14、he point-to-multipoint mode ofoperation3) 2048 kbit/s Digital Structured Leased Line (D2048S); Terminal Equipment Interface, in accordance withETS 300 4204) 2048 kbit/s Digital Unstructured Leased Line (D2048U); Terminal Equipment Interface, in accordance withETS 300 2485) 64 kbit/s Unrestricted Dig
15、ital Leased Line (D64U); Terminal Equipment Interface, in accordance withETS 300 290The IVN can be a dedicated transmission system or a cross connect system. IVNs which include inverse multiplexertechniques (e.g. channel aggregation in accordance with ISO/IEC 13871) are covered by this Standard as f
16、ar as theysupport one of the interfaces listed above.At the Q reference point the mappings provide a 64 kbit/s service for user channels and a packet mode service for thesignalling channel. Bearer conditioning is outside the scope of this Standard, except for deriving 64 kbit/s channels andfor provi
17、ding the services of layer 2 for the signalling channel. The applied mapping is a static mapping, i.e. there is afixed relationship between user and signalling channels at the Q reference point and the timeslots of the interface at theC reference point; any changes are subject to administrative acti
18、ons.Management functions relating to failure management are outside the scope of this Standard.This Standard is applicable to PINXs which can be interconnected to form a Private Integrated Services Network(PISN) and which support signalling protocols at the Q reference point.2 ConformanceIn order to
19、 conform to this Standard, a PINX shall satisfy the requirements identified in the ImplementationConformance Statement (ICS) proforma in annex A.3 ReferencesETS 300 011 Integrated Services Digital Network (ISDN); Primary rate user-network interface: Layer 1specification and test principles (1992)ETS
20、 300 012 Integrated Services Digital Network (ISDN); Basic user-network interface: Layer 1specification and test principles (1992)ETS 300 248 Business Telecommunications (BT); Open Network Provision (ONP) technicalrequirements; 2048 kbit/s digital unstructured leased line (D2048U) - Terminal equipme
21、ntinterface (1993)- 2 -ETS 300 290 Business Telecommunications (BTC); 64 kbit/s digital unrestricted leased line with octetintegrity (D64U) - Terminal equipment interface (1994)ETS 300 402-2 Integrated Services Digital Network (ISDN); Digital Subscriber Signalling System No. one(DSS1) protocol; Data
22、 link layer; Part 2: General protocol specification (1995)ETS 300 420 Business Telecommunications (BTC); Open Network Provision (ONP) technicalrequirements; 2048 kbit/s digital structured leased line (D2048S) - Terminal equipmentinterfaceCCITT Rec. G.704 Synchronous frame structures used at primary
23、and secondary hierarchical levels (1991)CCITT Rec. I.112 Vocabulary of terms for ISDNs (1988)ISO/IEC 11579-1 Information technology - Telecommunications and information exchange between systems -Private integrated services network, Part 1: Reference configuration for PISN Exchanges(PINX) (1994)NOTET
24、his Standard also contains a number of informative references. Details of these publications are given in Annex B.4 Definitions4.1 External definitionsFor the purpose of this Standard the following external definitions shall apply. Integrated Services Digital Network CCITT Rec. I.112 Private Integra
25、ted Services Network ISO/IEC 11579-1 Private Integrated Services Network Exchange ISO/IEC 11579-14.2 Special definitions4.2.1 ChannelA means of bi-directional transmission of user or signalling information between two points.4.2.1.1 DQ-ChannelA channel used to convey call control information between
26、 the Q reference points of two peer PINXs.4.2.1.2 UQ-ChannelA channel used to convey user information between the Q reference points of two PINXs.4.2.2 Inter-PINX ConnectionA connection provided by an IVN between two C reference points used to transport inter-PINX information fromthe PISN control pl
27、ane and/or the PISN user plane.4.2.3 Inter-PINX LinkA link between the Q reference points of two PINXs, comprising the totality of signalling transfer and userinformation transfer means.- 3 -5 AbbreviationsICS Implementation Conformance StatementIPC Inter-PINX ConnectionIPL Inter-PINX LinkISDN Integ
28、rated Services Digital NetworkIVN Intervening NetworkPISN Private Integrated Services NetworkPINX Private Integrated Services Network Exchange6 IntroductionThis Standard specifies mapping functions for the following scenarios: Dedicated Transmission SystemThis scenario consists of one or more dedica
29、ted transmission systems, each in a point-to-point configuration andoffering at the C reference point interfaces with a channel structure similar to that of a basic or primary rate ISDNinterface. Cross-Connect SystemsThis scenario consists of one or more dedicated transmission systems in a point-to-
30、multipoint configuration,offering at the C reference point interfaces with a channel structure similar to that of a basic or primary rate ISDNinterface.Both scenarios can provide the same types of interface, which allows the same mapping functions to be used.The applied mapping is a static mapping.
31、There is a fixed relationship between user and signalling channels at the Qreference point and the timeslots of the interface at the C reference point.Administrative actions to apply the mapping are necessary at both sides of an IPL. Administrative actions are alsonecessary in the IVN when it contai
32、ns a cross-connect system.At the C reference point more than one interface type as well as more than one instance of an interface type may exist.NOTEFor more information refer to ECMA TR/65 clause 7.7 Capabilities at the Q reference pointFor each instance of the Q reference point: 1 signalling chann
33、el (DQ) for carrying the inter-PINX layer 3 signalling protocol; and N user channels (UQ)are provided. The user channels are numbered 1N.For a UQ-channel the following bearer capability shall be provided: information transfer rate: 64 kbit/s Other attributes shall be the same as at the C reference p
34、oint.NOTEThe provision of bearer conditioning can change these attributes. However, this is outside the scope of this Standard.For a DQ-channel the following bearer capability shall be provided: Transfer mode: packet mode Information transfer capability: unrestricted digital information- 4 - Informa
35、tion transfer rate: implementation dependent Other attributes shall be the same as at the C reference point.The functions to map DQand UQchannels to an inter-PINX connection (IPC) at the C reference point are described inclause 8.8 Mapping functionsThe PINX mapping functions shall meet the following
36、 requirements.8.1 Physical adaptationA PINX shall support at least one of the following physical adaptations:8.1.1 ISDN 2048 kbit/s Primary Rate User-Network Layer 1 InterfaceLayer 1 termination shall be in accordance with ETS 300 011 including the requirements for the “Application ofthe ETS 300 011
37、 for PTNX interconnections“ as contained in ETS 300 011 Annex A.Timeslots 1 to 31 shall be used for up to 31 IPCs, each IPC with the following bearer capability: Information transfer mode: circuit mode Information transfer capability: according to subscription (e.g. unrestricted digital information,
38、 speech, etc.) Information transfer rate: 64 kbit/s.NOTETimeslots that are not through connected to the peer PINX will not be used for an IPC.8.1.2 ISDN Basic User-Network Layer 1 InterfaceLayer 1 termination shall be in accordance with ETS 300 012, excluding application of the point-to-multipointmo
39、de of operation.When the IVN supports the D-channel end-to-end then 3 IPCs are provided at the C reference point.One IPC has the following bearer capability: Information transfer mode: circuit mode Information transfer capability: unrestricted digital information Information transfer rate: 16 kbit/s
40、.Two IPCs have the following bearer capability: Information transfer mode: circuit mode Information transfer capability: according to subscription (e.g. unrestricted digital information, speech, etc.) Information transfer rate: 64 kbit/s.When the IVN does not support the D-channel end-to-end then 2
41、IPCs are provided at the C reference point withthe following bearer capability: Information transfer mode: circuit mode Information transfer capability: according to subscription (e.g. unrestricted digital information, speech, etc.) Information transfer rate: 64 kbit/s.Within the scope of this claus
42、e network functionality shall be defined as the functions defined for the NT inETS 300 012.At installation time the physical adaptation functions at both sides of the IVN shall be designated as eithernetwork or user side as follows: If the IVN provides for network functionality, then the physical ad
43、aptation functions at both ends of the IVNshall be designated as user side;- 5 - If the IVN does not provide for network functionality, then the physical adaptation function at one end of theIVN shall be designated as network side and the other one shall be designated as user side.NOTEDesignation of
44、 the physical adaptation function at one side of the transmission system as network side does notnecessarily mean that the PINX at that side always has to provide for clock synchronization. However, if one ofthe two peer PINXs is to provide for the clock synchronization, then it has to be the PINX w
45、hose physicaladaptation function has been designated as network side.8.1.3 2048 kbit/s Digital Structured Leased Line (D2048S)Layer 1 termination shall be in accordance with ETS 300 420.The physical adaptation part of the mapping function shall, according to CCITT Rec. G.704 clauses 5.1.1.1 and5.1.1
46、.2, distinguish 32 timeslots of 256 bits. Timeslots shall be numbered from 0 to 31. Each timeslot shallconsist of 8 bits. The use of timeslot 0 shall be as defined in ETS 300 420. Timeslots 1 to 31 shall be used for upto 31 channels, each channel with the following bearer capability: Information tra
47、nsfer mode: circuit mode Information transfer capability: unrestricted digital information Information transfer rate: 64 kbit/s.NOTETimeslots that are not through connected to the peer PINX will not be used for an IPC.8.1.4 2048 kbit/s Digital Unstructured Leased Line (D2048U)Layer 1 termination sha
48、ll be in accordance with ETS 300 248.The provision of a synchronization clock to the dedicated transmission system is outside the scope of thisStandard.The physical adaptation part of the mapping function shall be able to provide a 8 kHz frame structure inaccordance with CCITT Rec. G.704, clauses 2.
49、3.1 and 2.3.2.Physical adaptation shall, according to CCITT Rec. G.704 clauses 5.1.1.1 and 5.1.1.2, distinguish 32 timeslots of256 bits. Timeslots shall be numbered from 0 to 31. Each timeslot shall consist of 8 bits.Physical adaptation shall be able to provide the Cyclic Redundancy Check 4 procedure (CRC-4) in accordancewith CCITT Rec. G.704 clause 2.3.3. The use of CRC-4 error notifications is outside the scope of this Standard.Timeslots 1 to 31 shall be used for up to 31 channels, each channel with the following bearer capability: Infor
