1、ITU-T RECMN*G.773 93 486259L 0583375 003 INTERNATIONAL TELECOMMUNICATION UN ION ITU-T TELECOMMUNICATION STAN DARD IZATION SECTOR OF ITU GENERAL ASPECTS OF DIGITAL TRANSMISSION SYSTEMS G .773 (03/93) PROTOCOL SUITES FOR Q-INTERFACES FOR MANAGEMENT OF TRANSMISSION SYSTEMS ITU-T Recommendation G.773 (P
2、reviously “CCIT Recommendation”) ITU-T RECMN*G-773 93 48b2.591 0583376 T4T FOREWORD The ITU Telecommunication Standardization Sector (ITU-T) is a permanent organ of the International Telecom- munication Union. The ITU-T is responsible for studying technical, operating and tariff questions and issuin
3、g Recommendations on them with a view to standardizing telecommunications on a worldwide basis. The World Telecommunication Standardization Conference (WTSC), which meets every four years, established the topics for study by the ITU-T Study Groups which, in their turn, produce Recommendations on the
4、se topics. ITU-T Recommendation G.773 was revised by the ITU-T Study Group XV (1988-1993) and was approved by the WTSC (Helsinki, March 1-12, 1993). NOTES 1 As a consequence of a reform process within the International Telecommunication Union (ITU), the CCITT ceased to exist as of 28 February 1993.
5、In its place, the ITU Telecommunication Standardization Sector (ITU-T) was created as of 1 March 1993. Similarly, in this reform process, the CCIR and the IFRB have been replaced by the Radiocommunication Sector. In order not to delay publication of this Recommendation, no change has been made in th
6、e text to references containing the acronyms “CCITT, CCIR or IFRB” or their associated entities such as Plenary Assembly, Secretariat, etc. Future editions of this Recommendation will contain the proper terminology related to the new ITU structure. 2 telecommunication administration and a recognized
7、 operating agency. In this Recommendation, the expression “Administration” is used for conciseness to indicate both a O ITU 1994 All rights reserved. No part of this publication may be reproduced or utilized in any form or by any means, electronic or mechanical, including photocopying and microfilm,
8、 without permission in writing from the ITU. ITU-T RECNNaG.773 93 = 48b259L 0583377 986 = CONTENTS Introduction 1.1 Scope 1.2 Abbreviations and symbols . Protocol suites overview Physical layer . 3.1 3.2 Data link layer 4.1 Data link layer for Al . 4.2 Data link layer for A2 . Network layer for Al a
9、nd A2 . 5.1 Service Physical layer for Al Physical layer for A2 5.2 Network protocol Mapping functions for Al and A2 . 6.1 Introduction 6.2 Service 6.3 Procedure Application layer for Al and A2 7.1 Overview 7.2 Syntax and encoding . 7.3 Association control . 7.4 Remote operations 7.5 Common manageme
10、nt information Conformance References Annex A . Example of extended mode for Al protocol suite Extended mode . A . 1 A.2 Configuration - Full duplex A.3 Electrical Requirements A.4 Line code AS Speed Page 1 1 1 3 4 4 6 7 7 9 10 10 11 12 12 12 12 13 13 13 13 13 14 14 15 16 16 16 16 16 16 Recommendati
11、on G.773 (03193) 1 ITU-T RECMN*G.773 93 = 48b2591 0583378 812 Recommendation G.773 PROTOCOL SUITES FOR Q-INTERFACES FOR MANAGEMENT OF TRANSMISSION SYSTEMS (Geneva, 1990; revised at Helsinki, 1993) 1 Introduction 1.1 Scope This Recommendation defines the characteristics of protocol suites for Q-inter
12、faces to connect transmission systems/equipments, as defined in Recommendation M.3010 i. Protocol suites for Q-interfaces of other systems/equipments will be specified in other Recommendations. The interfaces will support bidirectional data transfer for the management of telecommunications systems.
13、This Recommendation defines: - the layer services; - the layer protocols; - - the application service elements and protocols; the conformance requirements to be met by an implementation of these interfaces. This Recommendation does not define: - the structure or meaning of the management information
14、 that is transmitted by means of the protocol suites; the manner in which management is accomplished as a result of the application protocol exchanges; the interactions which result in the use of the application layer protocols. - - 1.2 Abbreviations and symbols 1.2.1 Abbreviations For the purposes
15、of this Recommendation, the following abbreviations apply: AARE AARQ ACSE AFI ASE ASN. 1 CD CLNS CMIP CMIS CMISE Conf CONS CSMA DCE DIS A-associate response A-associate request Association control service element Authority and format identifier Application service element Abstract Syntax Notation On
16、e Collision detection Connectionless-mode network service Common management information protocol Common management information service Common management information service element Confirm Connection oriented-mode network service Carrier sense multiple access Data circuit terminating equipment Draft
17、 international standard Recommendation G.773 (03193) 1 ITU-T RECMN*G-773 93 m qBb259L 0583379 759 m DLC DLS DSP DTE EOC HDLC Ind IS0 LLC LME MAC NDM NE NRM NRZ NRZI NS NSAP os1 PhC Ph PhS PICS PLS Qos Req Res ROSE SDH SM-ASE SP TMN UNC Data link connection Data link service Domain specific part Data
18、 terminal equipment Embedded operations channel High-level data link control Indication International Organization for Standardization Logical link control Layer management entity Media access control Normal disconnected mode Network element Normal response mode Non return to zero Non return to zero
19、 inverted Network service Network service access point Open Systems Interconnection Physical connection Physical Physical service Protocol implementation conformance statement Physical layer service Quality of Service Request Response Remote operations service element Synchronous digital hierarchy S
20、ystem management-application service element Session protocol Telecommunications management network Unbalanced operation nod response mode class 1.2.2 Symbols and abbreviations used in tables M Mandatory - The parameter is not present in the interaction described by the service or primitive concerne
21、d (=) The value of the parameter is equal to the value of the parameter in the column to the left 2 Recommendation 6.773 (03/93) ITU-T RECflNaG.773 93 Y862591 0583380 Y70 9 2 Protocol suites overview The structures of the protocol suites with the present layers are shown in Figure 1. The defined com
22、munication services and protocols are in accordance with the Open System Interconnection (03) reference model 2. ayer 7 - layer 6 - Layer 5 - layer 4 - Layer 3 - layer 2 - layer 1 SM-ASE L IS0 9595 CMISE IS09596 Rec. X.219, ACS Rec. X217, Mapping Function 1 Network layer I Daia link layer Physical l
23、ayer I 1 IS08482 EIA 485 , I Network layer IS0 8473 Data link layer 8802-2 + DAD2 Physical layer not specified Al T1507850-92/601 A2 1 Support ASE for network management transaction-oriented applications 2 Optimally support ASE FIGURE 116.773 Overview of protocol suites short stacks The protocols fo
24、r the different layers are based on CCITT Recommendations and/or IS0 Standards. Recommendation G.773 (03/93) 3 Two types of protocol suites are recommended to connect transmission systems/equipment to a “: - The short stack protocol suites (Al and A2) which will be used mainly as Qx protocol suites
25、as specified in Recommendation M.3010 i. - The fui1 7 layer stack protocol suites (CONS 1, CLNS 1 and CLNS2) which can be used as QdQ3 protocol suites, as defined by Recommendation M.3010 i and are mainly used to satisfy the requirements of complex NEs (e.g. equipment for the synchronous digital hie
26、rarchy). I Protocol profiles for CONS1, CLNSl and CLNS2 layers 1, 2 and 3 are defined in Recommendation 4.811 30. Protocol profiles for CONS1, CLNS1 and CLNS2 layers 4,5,6 and 7 are defined in Recommendation 4.812 3 13. To support already existing networks and to provide maximum flexibility, several
27、 possibilities are defined for layers 1,2 and 3. Each Administration should select depending on its own specific requirements needed. Layers 5, 6 and 7 are identical for the three protocol suites CONS1, CLNS1 and CLNS2 whilst almost identical requirements apply to layer 4. This Recommendation define
28、s the two protocol suites Al and A2. Because of the nulling of the transport layer, session layer and presentation layer for short stack protocol suites, mapping functions have been defined. NOTE - The protocol suites CONS1, CLNSl and CLNS2 replace the B protocol suites from the 1990 issue of this R
29、ecommendation. In particular: CONS 1 replaces B 1, CLNS1 replaces B3, CLNS2 replaces B2. 3 Physical layer 3.1 Physical layer for Al 3.1.1 Service 3.1.1.1 Definition The service definition for the physical layer is in accordance with Recommendation X.211 3. The following classes of physical services
30、shall be supported - type of transmission is synchronous; mode of operation is half-duplex; topology is point-to-multipoint by a bus. - - 3.1.1.2 Service provided by the physical layer The physical layer provides the physical service primitives and parameters as listed in Table 1. The services PhC-A
31、ctivation and PhC-Deactivation will be provided to the layer management entity (LME) of the physical layer. 4 Recommendation 6.773 (OW3) 3.1.2 Primitive Service ITU-T RECMN*G.773 73 W 4862571 0583382 2Y3 Parameters TABLE UG.773 Provided physical service _ Data Transfer PhC-Deactivation Ph-DATA reque
32、st Ph-DATA indication Ph-DEACTIVATE request Ph-DEACTIVATE indication PhS-User data PhC- Activation Ph-ACTIVATE request Ph-ACTIVATE indication Physical interface 3.1.2.1 Physical characteristics 3.1.2.1.1 Configuration Serial bus operation in accordance with IS0 8482*) 4, in half-duplex mode. 3.1.2.1
33、.2 Transmission pairs Two screened balanced pairs, one for each direction of transmission. 3.1.2.1.3 Connector The Administration shall specify the connector type. 3.1.2.2 Electrical characteristics 3.1.2.2.1 Static and dynamic characteristics The static and dynamic characteristics of each bus conne
34、ction shall be in accordance with IS0 8482 4. When all generators connected to the bus are in the high impedance state, the bus shall be set to logical level ?1?. 3.1.2.2.2 Bus termination Each bus end shall be terminated in accordance with IS0 8482 141. 3.1.2.2.3 Load connection Each receiver shall
35、 present a maximum of one unit load, as defined in IS0 8482 4, to the bus. The number of load connections is limited to 32. 3.1.2.2.4 Bit rate The bit rate shall be 19 200 bids or 64 O00 bids. A bit rate of 128 O00 bih may be necessary in some applications. The bit rate tolerance shall be k0.05 %. 3
36、.1.2.2.5 Turn-off time For bit rates of 19 200 bids and 64 O00 bids a transmitting station shall put its generator in the high impedance state within 0.750 ms from the end of the last bit of the closing flag. For a bit rate of 128 O00 bids the turn-off time shall be not more than 0.375 ms. This poin
37、t is not applicable to a primary station (see 4.1.2.1.3). ?) Compliance assumes that full compatibility with EIA 485 32 is guaranteed. Recommendation G.773 (03/93) 5 ITU-T RECMN*G*773 93 4862591 0583383 L8T 3.1.2.2.6 Switch-on transient Following the enabling of the generator an implementation depen
38、dent preamble of no more than 4 bit times is allowed. No assumption as to the state of the bus during this preamble is allowed. 3.1.23 Linecode The line code shall be NRZI. 3.1.2.3.1 Principle Each IS0 8482 4 transition shall represent a ZERO, and no transition shall represent a ONE bit. 3.1.2.3.2 L
39、ock-in sequence Where required for clock extraction, it shall be possible to send a lock-in sequence containing at least four transitions immediately prior to the beginning of the starting flag of the frame to be transmitted. 3.1.2.4 Extended mode An example of extended mode is given in Annex A. 3.2
40、 Physical layer for A2 3.2.1 Overview Protocol suite A2 employs local area network technology for the physical and data link layers. Administrations will select the appropriate physical medium, e.g. coaxial cable, screened pairs, optical fibre according to technological and operational requirements.
41、 3.2.2 Service 3.2.2.1 Definition The service definition for the physical layer shall comply with that specified in clause 6 of IS0 8802-3 20. 3.2.2.2 All of the primitives defined and listed in Table 2 are mandatory. Service provided by the physical layer TABLE YG.773 Primitives of the physical lay
42、er r Primitives I PLS-DATA request PU-DATA indication PU-CARRIER indication PLS-SIGNAL indication 3.2.3 Bit rate The bit rate shall be 1 Mbils or higher. 6 Recommendation 6.773 (0-3) ITU-T RECflN*G.773 93 H 4862591 0583384 OLb = Parameter name Called address Calling address Responding address QOS 4
43、Data link layer Requestlindication ResponselConfirmation M - M - - M M M 4.1 Data link layer for Al Parameter name Originator Reason 4.1.1 Service 4.1.1.1 Definition The service definition of the data link layer is in accordance with Recommendation X.212 5. The class of data link service that shall
44、be provided by the data link layer is - connation-mode service. Request Indication - M M M 4.1.1.2 The data link layer requires the Data Transfer service from the physical layer. Service required from the physical layer 4.1.1.3 The data link layer shall provide the data link service, primitives and
45、parameters as listed in Tables 3 to 5. Service provided by the data link layer 4.1.1.3.1 DLC-Establishment See Table 3. TABLE 3/G.773 DLC-Establishment service 4.1.1.3.2 DLC-Release See Table 4. TABLE 4/G.773 DLC-Release service Recommendation G.773 (03/93) 7 ITU-T RECMN$Ge773 93 W 4862573 0583385 T
46、52 Parameter name DLS-User data 4.1.1.33 Normal Data Transfer See Table 5. Request Indication M M TABLE 5/G.773 Normal Data Transfer service 4.1.2 Data link protocol The data link protocol is synchronous HDLC type. 4.1.2.1 HDLC frame structure The HDLC frame structure shall conform to IS0 3309 (fram
47、e structure) 6. 4.1.2.1.1 Addressing field The addressing field shall be one octet. 4.1.2.1.2 Information field The infomation field in any HDLC frame shall be an integral number of octets. Information field octets shall be sent least significant bit first. The maximum length of the information fiel
48、d shall be 256 octets. 4.1.2.1.3 Inter-frame time fill A primary station shall transmit contiguous flags as inter-frame time fill. 4.1.2.2 Addressing The secondary station shall be capable of being assigned any address in the range 1 to 254. 4.1.2.2.1 All-station address The address field pattern “1
49、 11 11 11 1” is defined as the all-station address. 4.1.2.2.2 No-station address The address field pattern “00000000” is defined as the no-station address. The no-station address shall never be assigned to a secondary station. 4.1.2.2.3 Group addresses Not used. 4.1.2.3 HDLC procedure The HDi procedure is defined in IS0 4335 7. 8 Recommendation 6.773 (03/93) ITU-T RECMN*G=773 93 48b2591 O583386 999 4.1.2.3.1 Commands and response The following HDLC commands and responses must be supported: - commands SNRM Set normal response mode DISC Disconnect - com
