1、-. 8-6o-DL FED-STD-lOql TE W 7777777 0002736 4 9 FIPS PUB 100 FEDERAL STANDARD 1041 FEDERAL INFORMATION PROCESSING STANDARDS PUBLICATION 1983 JULY S -I i” . . . INTIERFACE BETWEN DATA TERMINAL EQUIPMENT (DTE) AND DATA CI RCUIT-TERM INATING EQUIPMENT (DCE) FOR OPERATION WITH PACKET-SWITCHED DATA COMW
2、rAUNICATIQNS NETWORKS CATEGORY: HARDWARE STANDARD - GENERAL SERVICES ADMINISTRATION I. THIS DOCUMENT CONTAINS -b- PAGES Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-FED-STD-1041 TE 7777977 0002737 h U U.S. DEPARTMEKT OF COMMERCE, Malcolm Baldrige,
3、 Secrerary NATIONAL BUREAU OF STANDARDS, Ernest Ambler, Director Foreword The Federal Information Processing Standards Publication Series of the National Bureau of provisions of Public Law 89-306 (Brooks Act) and under Part 6 of Title 15, Code of Federal Regulations. These legislative and executive
4、mandates have given the; Secretary of Commerce important responsibilities for improving the utilization and management of computers and automated data processing in the Federal Government. To carry out the Secretarys responsibilities, the NBS, through its Institute for Computer Sciences and Technolo
5、gy. provides leadership, technical guidance, and coordination of Government efforts in the development of guidelines and standards in these areas. Comments concerning Federal Information Processing Standards Publications are welcomed and should be addressed to the Director, Institute for Computer Sc
6、iences and Technology. National Bureau of Standards, Washington, DC 20234. Standards is the official publication relating to standards adopted and promulgated under -the - / -e . James H. Burrows, Direclor Institute for Computer Sciences and Technology Abstract This joint Federal Information Process
7、ing Standard (FIPS) and Federal (Telecommunication) Standard (FED-STD) specifies the means of interfacing automated data processing (ADP) equipment and services, as well as telecommunication system tepinal equipment, with packet-switched data communication networks. It is based on Recommcndation X.2
8、5 which was developed and approved by the International Telegraph and Telephone Consultative Committee (CCITT) of the International Telecommunications Union (ITU). Recommendation X.25 contains a large number of options and implementation alternatives, which if exercised in different ways would imped
9、e the interoperability of equipment and services. This joint standard limits these options and alternatives in order to satisfy the vast majority of Federal user requirements for interconnections with packet-switched data communications networks. Key words: automated data processing: computer networ
10、king: data circuit-terminating equipment; data communications: data terminal equipment; Federal Information Processing Standard; packet switching; public data netuirk: Recommendation X.25; telecommunications. Natl. Bur. Stand. (US) Fed. Info. Process. Stand. Publ. (FIPS PUB) 100, 13 page (1983) C0DE
11、N:FIPPAT I For sale by the National Technical Information Service, U.S. Department of Commcrcc. Springfield. VA 22161 .- I Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-I 1 FED-STD-1041 TE W 9977777 0002738 8 FIPS PUB 100 Federal Information Proces
12、sing Standards Publication 100 Federal Standard 1041 1983 July 6 ANNOUNCING THE JOINT STANDARD FOR - / / -e INTERFACE BETWEEN DATA TERMINAL EQUPMENT (DTE) AND DATA CIRCUIT-TERMINATING EQUIPMENT (DCE) FOR OPERATION WITH PACKET-SWITCHED DATA COMMUNICATIONS NETWORKS Federal Information Processing Stand
13、ards Publications are developed and issued by the National Bureau of Standards pursuant to section 11 l(f)(2) of the Federal Property and Administrative Services Act of 1949, as amended, Public Law 89.306 (79 Stat. 1127), Executive Order 11717 (38 FR 12315, dated May 11, 1973), and Part 6 of Title l
14、.5 Code of Federal Regulations (CFR). Federal Standards in the “telecommunications“ series are developed by the Ofiice of the Manager, National Communications System. These Federal Standards are issued by the General Services Administration pursuant to the Federal Property and Administrative Service
15、s Act of 1949, as amended. - Name of Standard: Interface Between Data Terminal Equipment TE) and Data Circuit-Terminating Equipment (DCE) for Operation with Packet-Switched Data Communications Networks. Category of Standard Hardware, Data Transmission. 4 i 3 Explanation: Federal automated data proce
16、ssing equipment, services, and telecommunication equipment using public packet-switched data communications networks (PSDCN) based on the family of CCITT Recommendations derived from X. 1 and X.2 shall employ the interface and protocols specified in this joint standard. In addition, designers of the
17、se internally operated and maintained Federal networks employing packet-switched technology should consider the use of this interface as appropriate. The joint standard provides: - A family of physical layer interfaces, from which a particular interface may be selected; and - A single data link laye
18、r control procedure; and - Packet level procedures for virtual calls and permanent virtual circuits, and an optional datagram operation. The mandatory interface attributes of this joint standard are summarized as follows: PHYSICAL LEVEL Transmission rates: Interface: 2.4, 4.8, 9.6 Kbitsh one or more
19、 of the following: RS-232-C, X.21, RS-449 LINK LEVEL: Procedure: LAPB Parameter K: 7 Smallest N1: 164 Octets Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-FED-STD-LOLIL TE m 9977977 0002737 T m - FIPS IUH I00 PACKET LEVEL: Services: Facket types: U
20、ser data field length: Packet sequence numbering: D bit procedure: X.25 diagnostic codes: Fast Select: Interrupt packet: Duplicated facility Non-zero cause field of restart request packet: Restart request too long in state rl: codes: Virtual call and permanent virtual circuit All basic plus Diagnost
21、ic packets. Packet Reject shall not be used. Octet-aligned Modulo 8 _- / -e Supported by all DCEs; DTE need not employ the D bit when sending to the DCE, but no DTE shall reject incoming packet with the D bit set to 1 or O as having this bit in error unless it is known by receiver that the sender ha
22、s no D bit capability. Use standard codes whenever they apply; non-std codes may be used for events not listed in X.25 within a period of 24 months after the effective date of this standard. DCEs shall implement fast select; DTE need not employ fast select when sending to DCE, but all DTEs with high
23、er level functionality which allows response to fast select must be able to accept incoming fast select packet. Receipt of a DTE interrupt packet before a previous DTE interrupt packet has been confirmed is an error condition. The last appearing facility code should be treated by the DTE as if it we
24、re the only appearance of that code. Disc arde d . Discarded This joint standard is intended to enhance interoperability by specifying certain subsets and other constraints on Federal use of CCIIT Recommendation X.25. The Governments intent in employing this joint standard is to reduce the cost of a
25、cquiring and using Federal automated data processing equipment, services, and telecommunication equipment with PSDCN. The joint standard is also intended to reduce the cost of acquiring and using Government-owned or leased PSDCN. These goals will be achieved by: - Increasing the available alternativ
26、e sources of supply; - Increasing the reutilization of Government resources; and, - Assuring the required interoperability. Approving Authority: Secretary of Commerce (Federal Information Processing Standards). Administrator, General Services Administration (Federal Standards). Maintenance Agency: T
27、he National Bureau of Standards and the Office of the Manager, National Communications System will jointly maintain this standard coordinating as necessary with the General Services Administration (GSA). f Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-
28、,-,- FED-STD-LOqL TE 7777777 00027qO b M FIPS PUB 100 Cross Index: The following are related standards upon which this FIPS PUB is based. The inclusion of a particular standard on this list does not necessarily mean that the standard is applicable in all cases to which this FIPS PUB applies. (a) Int
29、ernational Standard 21 10-1980: Data Communication-25-Pin DTE/DCE Interface Connector and Pin Assignments. (b) International Telegraph and Telephone Consultative Committee (CCITT) Recommendation V.24 (1980): List of Definitions for Interchange Circuits Between Data Terminal Equipment and Data Circui
30、t Terminating Equipment. - (c) CCITT Recommendation V.28 (1980): Electrical characteristics for Unbalanced Doublf-kurrent- (d) Electronics Industries Association (EIA). RS-232-C (1969 August): Interface Between Data (e) International Standard 4902- 1980: Data Communication-3 7-Pin and 9-Pin DTE/DCE
31、Interface (f) CCITT Recommendation V. 1 1 (X.27) (1980): Electrical Characteristics for Balanced Double-Current Interchange Circuits. Terminal Equipment and Data Communication Equipment Employing Serial Binary Data Interchange. Connectors and Pin Assignments. Interchange Circuits for General Use wit
32、h Integrated Circuit Equipment in the Field of Data Communications. (g) EIA RS-422-A (1 978 June): Electrical Characteristics of Balanced Voltage Digital Interface Circuits. (h) Federal Standard 1020A (1980 January): Telecommunications: Electrical Characteristics of Balanced Voltage Digital Interfac
33、e Circuits. (i) CCITT Recommendation V. 10 (X.26) (1980): Electrical Characteristics for Unbalanced Double- Current Interchange Circuits for General Use with Integrated Circuit Equipment in the Field of Data Communications. u) EIA RS-423-A (1978 June): Electrical Characteristics of Unbalanced Voltag
34、e Digital Interface Circuits. (k) Federal Standard 1030A (1980 January): Telecommunications: Electrical Characteristics of Unbalanced Voltage Digital Interface Circuits. (1) CCITT Recommendation X.2lbis (1980): Use on Public Data Networks of Data Terminal Equipment which are Designed for Interfacing
35、 to Synchronous V-Series Modems. (m) CCITT Recommendation V.54 (1980): Loop Test Devices for Modems. (n) EIA RS-449 (1977 November): General Purpose 37-Position and 9-Position Interface Between Data Terminal Equipment and Data Circuit-Terminating Equipment. (o) Federal Standard 103 1 (1980 June): Te
36、lecommunications General Purpose 37-Position and 9-Position Interface Between Data Terminal Equipment and Data Circuit Terminating Equipment. (Implementing instructions in the form of a Federal Property Management Regulation have not yet been issued. The General Services Administration is considerin
37、g cancelling FED-STD 103 1. Furthermore, a Federal Information Processing Standard for ADP applications corresponding to Federal Standard 103 1 has not been adopted by the National Bureau of Standards.) (p) International Standard 4903- 1980: Data Communication-15-Pin DTE/DCE Interface Connector and
38、Pin Assignments. (q) EIA Industrial Electronics Bulletin No. 12 (1977 November): Application Notes on Interconnection Between Interface Circuits Using RS-449 and RS-232-C. (r) Draft International Standard 2593 (1980): Data Communication-34-Pin DTE/DCE Interface Connector and Pin Assignments. (s) CCI
39、TT Recommendation V.35 (1980): Data Transmission at 48 Kilobits per Second Using 60-108 kHz Group Band Circuits. (t) CCITT Recommendation X.21 (1 980): General Purpose Interface Between Data Terminal Equipment and Data Circuit- Terminating Equipment for Synchronous Operation on Public Data Networks.
40、 (u) CCIT Recommendation V.5 (1980): Standardization of Data-Signalling Rates for Synchronous Data Transmission in the General Switched Telephone Network (v) CCIT Recommendation V.6 (1980): Standardization of Data-Signalling Rates for Synchronous Data Transmission on Leased Telephone- Type Circuits.
41、 (w) American National Standard X3.1- 1976: Synchronous Signaling Rates for Data Transmission. (x) Federal Information Processing Standard Publication 22-1 (1977 September): Synchronous Signaling Rates Between Data Terminal and Data Communication Equipment. (FIPS PUB 22-1 is identified also as FED-S
42、TD 1013.) Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-FED-STD-LOLIL TE = 7777777 00027LIL W FIPS PUB 100 I (y) Federal Standard 1013 (1977 August): Telecommunications: Synchronous Signaling Rates Between Data Terminal Equipment and Data Circuit-T
43、erminating Equipment Utilizing 4 kHz Circuits. (FED-STD 101 3 is identified also as FIPS PUB 22-1.) (z) American National Standard X3.36-1975: Synchronous H other types of access (e.g., through the- -I general switched telephone network) may also be offered. CCITT Recommendation X. 1 standardizes da
44、ta signalling rates of 2.4, 4.8, 9.6, and 48 kbitsh for packet mode interfaces. At a minimum, networks shall support the synchronous data signalling rates of 2.4, 4.8, and 9.6 kbits/s full duplex; other speeds (e.g., 19.2 kbitsh) may also be offered. The 48 kbits/s rate need not be supported in thos
45、e locations where it is not available; 56 kbitsh is recommended in its place (see American National Standard X3.36-1975 and related documents referenced above). The term “user class of service” used in X.25 refers to the data signalling rate of DTE/DCE interface. In accordance with CCITT Recommendat
46、ion X.25, networks shall provide one or more of the following interface options: i. CCITT Recommendation X.21; ii. EIA RS-232-C, which is essentially equivalent to one of the options in CCITT Recommendation X.2 1 bis; iii. CCITT Recommendation X.2lbis option that is equivalent to RS-449 using only t
47、he EIA RS-423A unbalanced electrical characteristics. Interworkingbetween EIA RS-232-C on one side of the interface and RS-449 on the other side is permitted in accordance with EIA Industrial Electronics Bulletin Number 12. Where interworking with RS-232-C equipment is not required, the provisions d
48、escribed below employing RS-449 with the RS-422A electrical characteristics may optionally be employed at signalling rates below 48 kbit/s. Networks which support 48 or 56 kbits/s data signalling rates shall provide one or more of the following interface options: i. CCITT Recommendation X.21; ii. CC
49、ITT Recommendation X.2 Ibis option that specifies CCITT Recommendation V.35; or iii: CCITT Recommendation X.2 1 bis option that specifies CCITT Recommendation V. 36 NOTE: Current study in national and international standards groups may result in the development of additional physical interfaces. Each such physical interface will be evaluated for inclusion in this joint standard. If there are significant savings, one physical interface may be selected as the future m
