1、t UROPEAN T 1 ELECOMMUNICATION STANDARD ETS 300 467 March 1998 Source: NA Reference: DE/NA-053204 ICs: 33.020 Key words: Broadband, frame relay, interworking, ISDN, B-ISDN, frame mode, Bearer Broadband Integrated Services Digital Network (B-ISDN); Support of Frame Relay Bearer Service (FRBS) in B-IS
2、DN and frame relay interworking between 6-ISDN and other networks ETSI European Telecommunications Standards Institute ETSI Secretariat Postal address: F-O6921 Sophia Antipolis CEDEX - FRANCE Office address: 650 Route des Lucioles - Sophia Antipolis - Valbonne - FRANCE Internet: secretariat Q et.si.
3、fr - http:/www.etsi.fr - http:/www.etsi.org Tel.: +33 4 92 94 42 O0 - Fax: +33 4 93 65 47 16 Copyright Notlficatlon: No part may be reproduced except as authorized by written permission. The copyright and the foregoing restriction extend to reproduction in all media. O European Telecommunications St
4、andards Institute 1998. All rights reserved. STD=ETSI ETS 300 Yb7-ENGL 1798 U 3qOCIACC 02725b2 b30 Page 2 ETS 300 467: March 1998 Whilst every care has been taken in the preparation and publication of this document, errors in content, typographical or otherwise, may occur. If you have comments conce
5、rning its accuracy, please write to “ETSI Editing and Committee Support Dept.“ at the address shown on the title page. STD-ETSI ETS 300 4b7-ENGL 1998 Q 31iUClE.5!i 112725L3 577 Page 3 ETS 300 467: March 1998 Contents Foreword 5 1 Scope . 7 2 Normative references 7 3 Abbreviations . 8 4 Service descr
6、iption 10 Functional architecture 1 O 4.1.1 4.1.2 4.1.3 4.1 FRBS provided by FRSF inside B-ISDN . 10 capabilities . 11 Frame relay protocol support via ATM bearer capabilities . -12 FRBS provided by FRSF outside B-ISDN, accessed via ATM bearer 5 Interfaces and protocols 13 5.1 Frame Relay B-ISDN Acc
7、ess Interface (FR-BAI) 13 5.1.1 Physical Layer . 14 5.1.2 ATM layer 14 5.1.3 AAL 14 5.1.3.1 AAL5 SAR and CPCS 14 5.1.3.2 FR-SSCS . 14 Physical Layer (PL) . 15 5.2.3.1 AAL5 SAR and CPCS 15 5.2.3.2 FR-SSCS . 15 Service provided by FR-SSCS 15 5.3.1.1 Primitives . 16 5.3.1.2 Description of connections 1
8、7 Interaction with the management and control plane 17 Functions. structure and coding of FR-SSCS . 17 5.3.3.1 Functions in FR-SSCS . 17 5.3.3.2 FR-SSCS-PDU structure and coding 18 Procedures for the FR-SSCS 18 5.3.4.1 State variable . 18 5.3.4.2 Procedures at the sender side . 18 5.3.4.3 Procedures
9、 at the receiver side . 19 5.3.4.4 Summary of parameters and values on the FR-SSCS connections 21 5.3.5 Frame Relay Permanent Virtual Connection (FR-PVC) monitoring 21 Multiplexing of FRBS connections over B-ISDN 22 Congestion management strategy . 23 5.2 Frame relay B-ISDN Network-to-Network Interf
10、ace (FR-BNNI) 14 5.2.1 5.2.2 ATM layer 15 5.2.3 AAL 15 5.3 FR-SSCS 15 5.3.1 5.3.2 5.3.3 5.3.4 5.4 5.5 Annex A (normative): Additional procedures for Frame Relay Permanent Virtual Connections (FR PVCs) for the carriage on ATM using unnumbered information frame . 24 History . 25 STD-ETSI ETS 300 4b7-E
11、NGL I m 34LlClB5.5 0272Cbli 4U3 9 Page 5 ETS 300 467: March 1998 Foreword This European Telecommunication Standard (ETS) has been produced by the Network Aspects (NA) Technical Committee of the European Telecommunications Standards Institute (ETSI). This European Telecommunication Standard (ETS) def
12、ines the B-ISDN architectural configuration for providing the FRBS service. Transposition dates Date of adoption of this ETS: Date of latest announcement of this ETS (doa): 20 February 1998 30 June 1998 Date of latest publication of new National Standard or endorsement of this ETS (doph): 31 Decembe
13、r 1998 Date of withdrawal of any conflicting National Standard (dow): 31 December 1998 Previous page is blank Page 7 ETS 300 467: March 1998 1 Scope This ETS defines the Broadband Integrated Services Digital Network (B-ISDN) architectural configuration for providing the Frame Relay Bearer Service (F
14、RBS) service. B-ISDN FRBS is defined in ETS 300 399-1 5 and ETS 300 399-4 8. This ETS specifies service specific convergence sublayer of AAL type 5 and its use for B-ISDN FRBS. The B-ISDN FRBS belongs is a connection-oriented, variable bit rate, non assured operation broadband services with no timin
15、g relation between the sender and receiver. This ETS also describes the network interworking between B-ISDNs supporting FRBS and other ISDNs and Public Data Networks (PDNs) supporting FRBS as defined in ETS 300 399-1 5, ETS 300 399-2 6 and ETS 300 399-3 7. It describes also access configurations to
16、networks supporting FRBS or FRDTS. This ETS defines only the U-plane procedures for FRBS supported on Permanent Virtual Connections (PVCS). 2 Normative references This ETS incorporates by dated and undated reference, provisions from other publications. These normative references are cited at the app
17、ropriate places in the text and the publications are listed hereafter. For dated references, subsequent amendments to or revisions of any of these publications apply to this ETS only when incorporated in it by amendment or revision. For undated references the latest edition of the publication referr
18、ed to applies. 31 41 71 91 ETS 300 298-2: “Broadband Integrated Services Digital Network (B-ISDN); Asynchronous Transfer Mode (ATM); Part 2: B-ISDN ATM layer specification ITU-T Recommendat ion I .361 (1 995)“. ETS 300 299: “Broadband Integrated Services Digital Network (B-ISDN); Cell based user net
19、work access for 155 520 kbit/s and 622 080 kbit/s; Physical layer interfaces for B-ISDN applications“. ETS 300 300: “Broadband Integrated Services Digital Network (B-ISDN); Synchronous Digital Hierarchy (SDH) based user network access; Physical layer User Network Interfaces (UNI) for 155 520 kbit/s
20、and 622 080 kbit/s Asynchronous Transfer Mode (ATM) B-ISDN applications“. ETS 300 337: “Transmission and Multiplexing (TM); Generic frame structures for the transport of various signals (including Asynchronous Transfer Mode (ATM) cells and Synchronous Digital Hierarchy (SDH) elements) at the ITU-T R
21、ecommendation G.702 hierarchical rates of 2 048 kbit/s, 34 368 kbi/s and 139 264 kbit/s“. ETS 300 399-1 : “Frame relay services; Part 1 : General description“. ETS 300 399-2: “Frame relay services; Part 2: Integrated Services Digital Network (ISDN); Frame relay bearer service; Service definition“. E
22、TS 300 399-3: “Frame relay services; Part 3: Frame relay data transmission service; Service definition“. ETS 300 399-4: “Frame relay services; Part 4: Broadband Integrated Services Digital Network (B-ISDN); Frame relay bearer service; Service definition“. ETC 300 428: “Broadband Integrated Services
23、Digital Network (B-ISDN); Asynchronous Transfer Mode (ATM) Adaptation Layer (AAL) specification - type 5“. Previous page is blank STDOETSI ETS 300 4L7-ENL 1998 3400855 02725hb 28b D Page 8 ETS 300 467: March 1998 11 11 i 31 11 41 ETS 300 455-1: “Broadband Integrated Services Digital Network (B-ISDN)
24、; Broadband Virtual Path Service (BVPS); Part 1: BVPS for Permanent communications (BVPS-P)“. ETS 300 455-2: “Broadband Integrated Services Digital Network (B-ISDN); Broadband Virtual Path Service (BVPS); Part 2: BVPS for Reserved communications (BVPS-R)“. ITU-T Recommendation F.811 (1 993): “Broadb
25、and connection-oriented bearer service“. ITU-T Recommendation G.804 (1 994): “ATM cell mapping into plesiochronous digital hierarchy (PDH)“. ITU-T Recommendation G.832 (1994): “Transport of SDH elements on PDH networks - Frame and multiplexing structures“. i 51 CCITT Recommendation 1.233.1 (1992): “
26、ISDN frame relaying bearer service“. i 91 ITU-T Recommendation 1.363 (1994): “B-ISDN ATM Adaptation Layer (AAL) specificat ion“. ITU-T Recommendation 1.365.1 (1 994): “Frame relaying service specific convergence sublayer (FR-SSCS)“. CCITT Recommendation 1.370 (1992): “Congestion management for the I
27、SDN frame relaying bearer service“. ETS 300 301, Edition 2 (1997): “Broadband Integrated Services Digital Network (B-ISDN); Traffic control and congestion control in B-ISDN ITU-T Recommendation 1.371 (1996)“. ITU-T Recommendation 1.372 (1 993): “Frame relaying bearer service network- to-network inte
28、rface requirements“. ITU-T Recommendation 1.555 (1 994): “Frame relaying bearer service interworking“. CCITT Recommendation (2.922 (1992): “ISDN data link layer specification for frame mode bearer services“. ITU-T Recommendation (2.933 (1 994): “Digital Subscriber Signalling System No.1 (DSS1) - Sig
29、nalling specification for frame mode basic call control“. 41 ITU-T Recommendation 1.327 (1 993): “B-ISDN functional architecture“. 3 Abbreviations For the purposes of this ETS, the following abbreviations apply: AAL AAL5 ATM ATM-VCC B-ISDN B-TE BECN BVPS C/R CBR CEB CEF ATM Adaptation Layer AAL type
30、 5 Asynchronous Transfer Mode Asynchronous Transfer Mode-Virtual Circuit Connection Broadband Integrated Services Digital Network B-ISDN Terminal Backward Explicit Congestion Notification Broadband Virtual Path Service Command/Response bit Constant Bit Rate Congestion Encountered Backward Congestion
31、 Encountered Forward STD-ETSI ETS 300 4b7-ENGL. 1798 3LiUU85S 0%7%5b7 132 Page 9 ETS 300 467: March 1998 CI CPCS CPCS-CI CPCS-LP CPCS-uu D/C DE DLCI DSS 1 DTE EA FCS FECN FR FR-BNNI FR-IWP FR-SSCS FR-BAI FR-IA1 FR-I NN I FR-PAI FR-P N N I FRBS FRDTS FRSF ID ISDN IWF LME LS B MSB NNI PCI PDH PDN PDU
32、PHY PISN PVC SAP SAR SDH SDU sscs TE UNI UPC VBR vc vcc VCI VP VPC VPI Congestion Indication Common Part Convergence Sublayer CPCS - Congestion Indication CPCS - Loss Priority CPCS - User-to-User Indication DLCI or DL-CORE control indicator Discard Eligibility Data Link Connection Identifier Digital
33、 Subscriber Signalling Nol Data Terminal Equipment Address Extension bit Frame Check Sequence Forward Explicit Congestion Notification Frame Relay Frame Relay Broadband Network-to-Network Interface Frame Relay Interworking Point Frame Relay Service Specific Convergence Sublayer Frame Relay Broadband
34、 Access Interface Frame Relay ISDN Access Interface Frame Relay ISDN Network to Network Interface Frame Relay Private Access Interface Frame Relay Private Network to Network Interface Frame Relay Bearer Service Frame Relay Data Transmission Service Frame Relay Service Function Interface Data Integra
35、ted Service Digital Network Intenivorking Function Layer Management Entity Least Significant Bit Most Significant Bit Network Node Interface Protocol Control Information Plesiochronous Digital Hierarchy Public Data Network Protocol Data Unit Physical layer Private Integrated Service Network Permanen
36、t Virtual Connection Service Access Point Segmentation and Reassembly Sublayer Synchronous Digital Hierarchy Service Data Unit Service Specific Convergence Sublayer Terminal Equipment User Network Interface Usage Parameter Control Variable Bit Rate Virtual Channel Virtual Channel Connection Virtual
37、Channel Identifier Virtual Path Virtual Path Connection Virtual Path Identifier Page 10 ETS 300 467: March 1998 4 Service description This description of FRBS in B-ISDN is in accordance with: - ITU-T Recommendation F.811 12, which provides a service description of a broadband connection oriented bea
38、rer service. ITU-T Recommendation F.811 121 includes the following SeNiCe subcategories: - - - sub-category A: Constant Bit Rate (CBR); subcategory B: Variable Bit Rate (VBR) with timing; sub-category C: VBR without timing: C1: emulation of packet mode bearer services; C2: emulation of frame mode be
39、arer services; C3: others. - sub-category X: Asynchronous Transfer Mode (ATM) Adaptation Layer (AAL) defined by user; - ETS 300 399-2 6, which defines ISDN FRBS; - ETS 300 399-1 5; - ETS 300 399-4 8. 4.1 Functional architecture 6-ISDN is capable of supporting data transfer between B-ISDN customers b
40、ased on frame relay transfer techniques. The B-ISDN configuration is in line with the functional architecture defined in ITU-T Recommendation 1.327 24. It need not directly imply frame relay methods implemented within B-ISDN. In the B-ISDN, virtual channels are established at the ATM layer by means
41、of the connection oriented technique. The frame relay protocol can be supported in the U-plane using the B-ISDN in the following three ways: a FRBS provided by Frame Relay Service Function (FRSF) inside B-ISDN; b) FRBS provided by FRSF outside 6-ISDN, accessed via ATM bearer capabilities; c) frame r
42、elay protocol support via ATM bearer capabilities. In all cases the protocol stack implemented in B-ISDN customer equipment is identical as shown in figures 1, 2 and 3. The management and control plane functions which need to be provided in the network in all cases are for further study. The three c
43、ases are outlined in the following paragraphs. 4.1.1 FRBS provided by FRSF Inside B-ISDN In this case the FRSF is provided within the 6-ISDN. The FRSF handles frame relay protocols and routes data according to routing information provided during frame relay connection establishment. This case is ill
44、ustrated in figures la and lb. -. -I -a - _- /- ATM switched 0 .- FRSF: Frame Relay Service Function -c. P, S, or T: Reference points -_ -* Flgure 1 a: FRBS provided by FRSF inside B-ISDN STD-ETSI ETS 300 Libl-EFJGL 1190 3qUU85.5 ClF!72CL7T95 m Page 11 ETS 300 467: March 1998 ATM PHY ATM FRSF ATM FR
45、SF ATM ATM ATM ATM ATM ATM PHY PHY PHY PHY PHY FR-SSCS I CPCS SAR NOTE: The ATM switching capabilities can be integrated with FRSF. Figure 1 b: Protocol stack of FRBS provided by FRSF inside B-ISDN The statistical multiplexing can be done at the frame level. in this case the bearer capabilities requ
46、ired from the ATM network can be met by those provided by the Virtual Path (VP) bearer service already defined in ETS 300 455 ll, with peak bandwidth allocation. Virtual Channel (VC) bearer capabilities may also be deployed and the way of mapping the frame relay parameters into ATM transfer capabili
47、ties (e.g. for statistical multiplexing at the ATM layer) is for further study. 4.1.2 FRBS provided by FRSF outside 8-ISDN, accessed via ATM bearer capabilities In this case a transparent connection of the ATM layer, is used between B-ISDN interfaces (at reference points SB/TB or M). Frame relay pro
48、tocols operating on and above the adaptation layer are transparent to the B-ISDN. The frame relay service and adaptation layer functions are implemented outside the B-ISDN. This case is illustrated in figures 2a and 2b. /e- -1 / I SorT connections / using VP or VC /I OHO . - )O 6-ISDN -. ATM connect
49、ion FRSF Frame Relay Service Function - M, S, or T Reference points - -_- -c Figure 2a: FRBS provided by FRSF outside B-ISDN Page 12 ETS 300 467: March 1998 FR-SSCS SAR 2 CPCS I ATM FRSF ATM FR-SSCS = CPCS SAR FRSF I CPCS II ATM II TE FR-SSCS ATM PHY Figure 2b: Protocol stack of FRBS provided by FRSF outside B-ISDN The requirements on the ATM layer are the same as in subclause 4.1.1 4.1.3 Frame relay protocol support via ATM bearer capabilities A frame relay protocol
