GB/T 11590-1999 International data transmission services and optional user facilities for public data networks and ISDN networks
Some standard content:
National Standard of the People's Republic of China
GB/T11590—1999
eqv ITU-T X. 2 : 1996
International data transmission servicesand optional user facilitiesin public datanetworks and ISDNs
Published on August 2, 1999
Implemented on March 1, 2000
Published by the State Administration of Quality and Technical Supervision
GB/T11590—1999
This standard is equivalent to the X.2 recommendation (1996 edition) formulated by the International Telecommunication Union (ITU-T). The writing format complies with the relevant provisions of GB/T1.1-1993 "Guidelines for Standardization Work Unit 1: Rules for Drafting and Presentation of Standards Part 1: Basic Provisions for the Writing of Standards".
This standard is the standard for international data transmission services and optional user facilities for my country's public data network and ISDN network. ITU-T X.2 recommendation was significantly revised after 1984 (revised in Malaga-Torremolinos in 1984; revised in Melbourne in 1988; revised in Helsinki in 1993; and revised again in 1996), merging the relevant parts of X.1, X.2 and X.10 recommendations and making a large number of additions. Therefore, it is necessary to revise my country's corresponding standard GB/T11590-1989. This revision of this standard, in accordance with the latest requirements of national standard formulation work, adjusts and supplements some contents that are not in the original recommendations, so the equivalent recommendation method is adopted.
The main revisions of this standard are as follows:
1 Added the foreword.
2In the ITU-T preface, according to Recommendation X.2 (1996 edition), the standard or recommended names for optional user facilities appearing in this standard are added, four data transmission services are defined, and optional user facilities that are available internationally are listed; the DTE services and identification methods used when obtaining packet switching data transmission services through the public switched telephone network (PSTN), circuit switched public data network (CSPDN) or integrated services digital network (ISDN) and when obtaining frame relay data transmission services through the public data network (PDN) are added.
3Added Chapter 1 Scope
4Added Chapter 2 Referenced Standards
5Added Chapter 3 Abbreviations
6In Chapter 4, four user facilities are added to the circuit switched data transmission service. Chapter 5, Packet-switched data transmission service, divides the packet-switched data transmission service in the original national standard into direct access and port access; in direct access, adds user service categories 23~26, 29, 30~33, 35, 37, 45, 53 and 59, adds 16 user facilities; in port access, adds 9 user facilities, adds DTE services and identification methods, adds facilities for packet-switched data transmission services for user-specified DTE services: adds the additional capabilities provided by multicast (multicast) services.
8 Added Chapter 6, Frame Relay Data Transmission Service. 9 Chapter 7, Leased Circuit Data Transmission Service, adds 14 user service categories. 10 Added Appendix A (Indicated Appendix) - Optional User Facility Coding. 11 Added Appendix B (Indicated Appendix) - Relationship between ISDN (I.250 Series Recommendations) Supplementary Services and Optional User Facilities of this Standard.
12 Based on the opinions of experts, retain and supplement the English-Chinese comparison table of terms (Appendix A). This standard shall replace GB/T11590-1989 from the date of implementation. This standard is proposed by the Ministry of Posts and Telecommunications of the People's Republic of China. This standard is under the jurisdiction of the Telecommunications Science Research and Planning Institute of the Ministry of Posts and Telecommunications. This standard was drafted by the Data Communication Technology Research Institute of the Ministry of Posts and Telecommunications. The main drafters of this standard are Xie Lin and Qiu Anding. This standard was first published in 1989.
This standard is entrusted to the Data Communication Technology Research Institute of the Ministry of Posts and Telecommunications for interpretation. 1
GB/T11590-1999
ITU-T takes into account:
ITU-T Foreword
(a) International user service categories and access types have been defined in GB/T11589. (b) Standardization of data transmission services, optional user facilities and DTE services corresponding to public data networks and ISDN networks that are available internationally is required:
(c) Standardization of additional optional user facilities and DTE services that may be provided by competent authorities and may be used internationally is required; (d) The optional user facilities listed in this standard are specified in other recommendations or standards, such as the relevant parts of the X.301 recommendation on network implementation and GB/T11593, GB/T11595 and other standards on network procedures; Note: The integration and interworking between the facilities in this standard and the supplementary services in the I,250 series of recommendations are explained in Appendix B. (e) Standardization of identification methods used by these DTE services that should be available internationally is required. These identification methods may be provided by competent authorities and may be used internationally; (f) These optional user facilities and DTE services may have an impact on the tariff structure. Unanimous recommendation:
1) For the following data transmission services, the optional user facilities of the various user service categories specified in GB/T11589 standard should be standardized:
i) Circuit switching data transmission service;
i) Packet switching data transmission service;
i) Leased circuit data transmission service;
iv) Frame relay data transmission service;
2) The optional user facilities that have become available internationally are listed in the following sections. Some optional user facilities can be used during each call, while other optional user facilities can be specified for use during an agreed contract period. In each case, the user has a given optional user facility option.
3) When packet-switched data transmission services are obtained via the public switched telephone network (PSTN), circuit-switched public data network (CSPDN) or integrated services digital network (ISDN), and when frame-relay data transmission services are obtained via the public data network (PDN), the DTE services and related identification methods used should also be standardized and described in the following clauses. 2
1 Scope
National Standard of the People's Republic of China
International data transmission servicesand optional user facilities in public datanetworks and ISDNs
GB/T11590—1999
eqvITU-T X.2:1996
Replaces GB/T11590—1989
This standard specifies the data transmission services and optional user facilities and DTE services of the public data network and integrated services digital network (ISDN) of my country.
This standard applies to public data networks and integrated services digital networks. 2 Referenced standards
The provisions contained in the following standards constitute the provisions of this standard through reference in this standard. When this standard is published, the versions shown are valid. All standards will be revised, and parties using this standard should explore the possibility of using the latest versions of the following standards. GB/T11589—1999 International user service categories and access types for public data networks and integrated services digital networks (ISDN) (eqvITU-TX.1:1996)
GB/T11591—1999 Packet assembly and disassembly (PAD) facilities in public data networks (idtITU-TX.3:1993) GB/T11593—1989 Interface between data terminal equipment (DTE) and data circuit terminating equipment (DCE) working synchronously on public data networks (eqyITU- TX.21:1984) GB/T11595-1999 Interface between packet data terminal equipment (DTE) and data circuit terminating equipment (DCE) connected to the public data network using dedicated circuits (idtITU-TX.25:1996) GB/T11597-1999
GB/T11598-1999
Procedure for exchanging control information and user data between packet assembly and disassembly (PAD) equipment and packet DTE or another PAD (idtITU-TX.29:1997) Packet-switched information system between public networks providing data transmission services (idtITU-TX.75:1996)
ITU-TX.6:1996 Multicast (multicast) service definition Technical characteristics of data transmission services
ITU-TX.7.1996
5 Integrated services digital network (ISDN) support for packet-based terminal equipmentITU-T X.31:1995
ITU-T X.32:1996
Interface between packet-based data terminal equipment (DTE) and data circuit-terminating equipment (DCE) accessed via a public switched telephone network or an integrated services digital network or a circuit-switched public data network
5 Interface between facsimile packet assembly and disassembly (FPAD) equipment and packet-based data terminal equipment (DTE) or another FPADITU-T X.39.1996
Procedure for exchanging control information and user data between ITU-T X.48:1996
6 Procedure for providing basic multicast (multicast) services using data terminal equipment (DTE) using X.25 recommendations ITU-T X.49.1996
Procedure for extended multicast (multicast) services provided by data terminal equipment (DTE) using X.25 recommendationsApproved by the State Administration of Quality and Technical Supervision on August 2, 1999Implementation on March 1, 2000
GB/T11590—1999
ITU-TX.213:1995Definition of network services for open systems interconnection for ITU applicationsITU-TX.223:1993Providing OSI connections or network services for ITU applications using X.25ITU-TX.301:1993Description of the general configuration for call control within and between subnets for providing data transmission services3Abbreviations
TOA/NPI
4Optional user facilities
Circuit mode bearer services
Circuit switched public data network| |tt||Closed User Group
Data Circuit-Terminating Equipment
Data Terminal Equipment
International Electrotechnical Commission
International Organization for Standardization
Integrated Services Digital Network
International Telecommunication Union
Network User Identification
Optional User Facilities
Packet Assembly and Disassembly Equipment
Public Data Network
Packet Mode Bearer Service
Public Switched Network
Packet Switched Public Data Network
Public Switched Telephone Network
Permanent Virtual Circuit
Recognized Operating Agency (formerly PROA)Address Type/Numbering Plan Identifier
Virtual Call
Switch Identification (No Numbering Format)
Optional User Facilities are facilities that modify or supplement the basic data transmission service. Therefore, it cannot be provided to users as a separate service, but must be provided to users together with a data transmission service. Optional user facilities are applicable to a variety of data transmission services. This standard specifies the capabilities associated with data transmission services and the required level of support. In general, this level of support can be expressed as one of the following:
E Basic user or DTE services or facilities should be made available internationally. A Additional user services or DTE services or facilities that may be used internationally on certain data networks. FS Whether this item will be fully supported when associated with a data transmission service is yet to be determined. This item is not applicable.
In some cases, the level of support depends on the support of other services or facilities or other aspects. This can be expressed by the following additional notes:
Referred to as "conditional support instructions", given at the bottom of the table where Cn appears. Cn
M User services or DTE services or facilities that must be supported by the competent authorities, but are not necessarily used internationally. Recommendation X.7 gives a detailed definition of optional user facilities. 2
Circuit switched data transmission service
GB/T11590—1999
Table 1 shows the optional user facilities of the circuit switched data transmission service that should be available internationally and the optional user facilities that can be adopted by some data networks and may also be used internationally. Table 1 Optional user facilities of the circuit switched data transmission service provided by the CSPDN Optional user facilities
Optional user facilities used during the agreed contract period Direct call
Closed user group
Closed user group with exit
Closed user group with entrance
Block incoming calls within the closed user group
Block outgoing calls within the closed user group
Calling line identification
Block outgoing calls
Bilateral closed user group
Bilateral closed user group with exit
Block incoming calls
Reverse charging acceptance
Connect when idle||tt| |Allowed to wait
Call redirection
Online facility registration
DTE deactivation registration/deregistration
Date and time indication
Hunting group
Manual answering
Optional user facility requested by DTE for each call Direct call
Abbreviated address call
Multi-address call (Note)
Reverse charging
ROA selection
Charging information
Called line identification
Closed user group selection
Bilateral closed user group selection
a)ROA is a recognized operating agency (formerly known as PROA). All user service categories
Note: This optional user facility also provides the ability for the user to request the establishment of the following point-to-multipoint configurations: centralized multipoint, distributed multipoint and broadcast mode. Packet-switched data transmission service
6.1 Direct access packet-switched data transmission service Tables 2 and 3 show respectively the services and optional user facilities of the packet-switched data transmission service that should be made available internationally, and those services3
and optional user facilities that can be used on certain data networks and may also be used internationally in the case of direct access packet-switched data transmission service.
GB/T11590—1999
These services and optional user facilities are described in the GB/T11595 standard. The DTE may use one or more of these services and facilities. In multicast (multicast) services, some optional user facilities have other functions (see Table 8). It must be noted that the GB/T11595 standard has some inherent features (such as the transmission of address extensions) that users can use to provide end-to-end OSI network services (see X.213 and X.223 Recommendation). This feature is described in the GB/T11595 standard and is called "DTE facilities defined by CCITT" (see Annex G of GB/T11595 standard). Note: Issues related to "connectionless service" are pending. Table 2 Various services of packet-switched data transmission services provided by PSPDN (direct access)
Service type
Virtual call service
Permanent virtual circuit service
8~11, 26 (synchronous mode), 30~61E
E (Note)
User service category
20~26 (start-stop mode)
Note: Category "E" is still assigned to this service. Although some administrations still consider the provision of this service to be a basic feature of international services, other administrations have stated that they do not provide this international service and its international application depends on bilateral negotiations. This service may not be used for maritime mobile communication services.
Table 3 Facilities for packet-switched data transmission services provided by the PSPDN (direct access)
User service category
8~11, 26
Optional user facilities
Optional user facilities used during the agreed contract period Extended frame sequence number (modulo 128)
Super-extended frame sequence number (modulo 32768) Multilink procedure
Extended packet sequence number (modulo 128)
Super-extended packet sequence number (modulo 32768) D bit modification
Packet retransmission
Blocking incoming calls
Blocking outgoing calls
One-way logical channel out
One-way logical channel in
Non-standard default packet length: (16, 32, 64, 256, 512, 1024, 2048, 4 096)
Nonstandard default window size
(Synchronous mode)
(Note 2)
(Note 2)
(Note 2)
(Note 2)
(Note 2)
(Start-stop mode)
(Note 1)
Optional user facilities
Default throughput class allocation
Flow control parameter negotiation
Basic throughput class negotiation
Extended throughput class negotiation
Closed user group
Closed user group with egress
Closed user group with ingress User group
Block incoming calls within closed user group
Block outgoing calls within closed user group
Bilateral closed user group
Bilateral closed user group with outbound
Quick selection acceptance
Reverse charging acceptance
Block local charging
NUI pre-medication
NUI replacement
Charging information
ROA reservation
Search group
Call redirection
Call redirection reservation
TOA/NPI address reservation
Direct call
Inter-network call redirection/redirection blocking reservation
Global Alternative Address Registration
Interface Specific Alternative Address Registration
Alternative Address Use Reservation
Optional User Facilities for Each Call
Flow Control Parameter Negotiation
Basic Throughput Class Negotiation
Extended Throughput Class Negotiation
Closed User Group Selection
Egressed Closed User Group Selection
Bilateral Closed User Group Selection
Reverse Charging
Quick Selection
NUI Selection
Charging Information
GB/T11590—1999
Table 3 ( (Continued)
User service category
8~11, 26
(Synchronous mode)
(Note 3)
(Start-stop mode)
(Note 1)
(Note 3)
ROA selection
Optional user facilities
Call redirection selection
Call redirection or call redirection notification
Called line address modification notification
Transfer delay selection and indication
Abbreviated address call
Inter-network call redirection/redirection status selection
Alternative address selection
Used when using virtual call service.
Used when using permanent virtual circuit service.
GB/T11590—1999
Table 3 (end)
The relationship between the parameters used for effective line utilization can be expressed as: cl
RXD/8<:XN1
Where: R-
Transmission rate (bit/second);
-Total round trip delay (seconds);
——The window size of the second layer,
N1-The length of a frame (number of octets). User service category
8~11, 26
(Synchronous mode)
(Start-stop mode)
(Note 1)
If the combination of variables and N1 does not satisfy equation (1), k, N1 or both should be increased. If equation (1) is satisfied and/or the value of N1 is a required extended frame sequence number and/or non-standard default packet length (also affects N1), then one or both of these facilities are M, otherwise they are both A.
If alternative address usage reservation is provided, then M, otherwise prohibited. c3
If extended throughput level negotiation is provided during the contract period, then M, otherwise prohibited. c4
If closed user group with egress or closed user group with ingress is provided and the network provides the ability to select whether to have a priority CUG, then M, otherwise prohibited.
If bilateral closed user group or bilateral closed user group with egress is provided, then M: otherwise prohibited. c5
If NUI reservation or NUI replacement is provided, then M, otherwise prohibited. c7
If call redirection reservation is provided, then M, otherwise prohibited. c8
If call redirection or call rerouting is provided, then M, otherwise A. 9 M if alternate address use reservation is provided, otherwise disabled. c9
1 Assume that the PAD function is used for virtual call service (see GB/T11591 standard). For permanent virtual circuit service, its scope of application is to be determined. 2 Under condition C1, the relationship between the third layer parameters of a single virtual circuit is similar to the relationship given by equation (1). In order to make full use of the virtual circuit, when the packet window size is required to be greater than 2, a non-standard default window size facility is required. If this window size is also greater than 7, an extended packet sequence numbering facility is also required. The exact relationship for single and multiple logical channel cases is to be determined. 3 A before 23:59 UTC on December 31, 2000, and E thereafter. 6.2 Port access packet switching data transmission service (user service categories 20~26 and 29) Note: GB/T11589 standard gives the definition of port access. Tables 4 and 5 show respectively the services and optional user facilities of the packet-switched data transmission service that should be made available internationally, and those services and optional user facilities that can be used on certain data networks and may also be used internationally in the case of direct access to the packet-switched data transmission service.
GB/T11590—1999
These services and optional user facilities are described in the GB/T11595 standard. DTE may use one or more of these services and facilities. Table 4 Various services of packet switched data transmission services provided by PSPDN (port access)
Service type
Virtual call service
Permanent virtual circuit service
20～26 (start-stop)
User service category
5 Facilities of packet switched data transmission services provided by PSPDN Table 5
(Port access)
User service category (Note 1)
Optional user facilities
Optional user facilities used during the agreed contract period 1.1
Online facility registration
D bit modification
Block incoming calls
Block outgoing calls
Non-standard default packet length (16, 32, 64, 256, 512, 1024, 20484.096)
Default Throughput Class Assignment
Flow Control Parameter Negotiation
Basic Throughput Class Negotiation
Extended Throughput Class Negotiation
Closed User Group
Closed User Group with Egress
Closed User Group with Ingress
Block Incoming Calls in Closed User Group
Block Outgoing Calls in Closed User Group
Bilateral Closed User Group
Closed User Group with Egress
Quick Select Accept
Reverse Billing Accept
Block Local Billing
NUI Reservation
Billing Information
ROA Reservationwww.bzxz.net
(Start-Stop)
Search Group||tt ||Call redirection
Optional user facilities
TOA/NPI address reservation
Direct call
Inter-network call redirection/redirection prevention reservation
Optional user facilities for each call
Closed user group selection
Closed user group selection with exit
Bilateral closed user group selection
Reverse charging
Quick selection
NUI selection
Charging information
ROA selection
Call redirection or call redirection notification
Called line address change notification
Transfer delay selection and indication
Abbreviated address call
VC is used when using virtual call service.
Used when using permanent virtual circuit service.
GB/T11590—1999
Table 5 (end)
C1 If a closed user group is provided, it is M, otherwise it is prohibited. User service category (Note 1)
(start-stop)
A, E,
(Note 2)
(Note 2)
C2 If a closed user group with an exit or a closed user group with an entry is provided and the network provides the ability to select whether to have a priority CUG, it is M; otherwise it is prohibited.
C3 If NUI reservation or NUI replacement is provided, it is M, otherwise it is prohibited. Note
1 Assume that the PAD function is used for virtual call services (see GB/T11591 and GB/T11595 standards and X.8 recommendations). For permanent virtual circuit services, its1
applicability is to be determined.
2 See Note 3 of Table 3.
6.3 Port access packet-switched data transmission services (user service classes 8 to 12, 26 and 30) 6.3.1 DTE services and identification methods
Table 6 shows the DTE services and associated identification methods that should be made available internationally for user service classes 8 to 12, 26 and 30 of the access packet-switched data transmission service via an intermediate switching network, and shows those DTE services and associated identification methods that are available for certain data networks and that may also be used internationally for the port access packet-switched data transmission service. Permanent virtual circuits are not provided within the scope of clause 6.3. The detailed definition of DTE services and identification methods is contained in Recommendation X.32. 8
1 Non-identified
DTE services
(dial-in by DTE)
Non-identified
(dial-out by PSPDN)
3 Identified
4 User-specified
(Note 2)
No identification.
Dial-in by DTE
Dial-out by PSPDN
Dial-in by DTE
Dial-out by PSPDN
Identification is provided by the public switched network.
GB/T11590—1999
Table 6 DTE services and identification methods
User service categories
8~12, 26
(synchronous mode) and 30
(Note 1)
(Note 1)
Identification is provided by the data link layer XID procedure. Identification is provided by the NUI selection facility.
Packet switched public data network.
(Note 1)
DTE identification
(Note 1)
DTE or DCE identification method that the network can provide when the network provides the corresponding DTE service. NUI
DCE Identification
1 Administrations providing port access for packet-switched data transmission services for service categories 8 to 12, 26 and 30 shall provide at least non-identified DTE service (dial-in by DTE) with no DTE identification method, or identified DTE service (dial-in by DTE) with DTE identification method provided by the PSN.
2 User-specified DTE service is a DTE service that may or may not provide PSPDN dial-out. However, the possible identification methods for DTE dial-in and PSPDN dial-out are different. 6.3.2 Facilities
For non-identified DTE service (dial-in by DTE), non-identified DTE service (dial-out by PSPDN) and identified DTE service, the optional user facilities provided at the DTE/DCE interface are the default values specified by the X.32 Recommendation. For user-specified DTE service, the optional user facilities that should be made available internationally, and those that are available for certain data networks and may also be used internationally are shown in Table 7. Table 7 Facilities for packet-switched data transmission service for user-specified DTE service Optional user facilities
Optional user facilities for use during the agreed contract period Extended frame sequence number
Multilink procedure
Extended packet sequence number (modulo 128)
D bit modification
Packet retransmission
Incoming call blocking
User service category
8 to 12, 26
(synchronous mode) and 30
A (Note 1)Recommendation 32 contains detailed definitions of DTE services and identification methods. 8
1 Non-identified
DTE service
(dialed in by DTE)
Non-identified
(dialed out by PSPDN)
3 Identified
4 User-specified
(Note 2)
No identification.
Dialed in by DTE
Dialed out by PSPDN
Dialed in by DTE
Dialed out by PSPDN
Identification provided by the public switched network.
GB/T11590—1999
Table 6 DTE services and identification methods
User service categories
8~12, 26
(synchronous mode) and 30
(Note 1)
(Note 1)
Identification is provided by the data link layer XID procedure. Identification is provided by the NUI selection facility.
Packet-switched public data network.
(Note 1)
DTE identification
(Note 1)
The DTE or DCE identification method that the network can provide when the network provides the corresponding DTE service. NUI
DCE Identification
1 Administrations providing port access for packet-switched data transmission services for service categories 8 to 12, 26 and 30 shall provide at least non-identified DTE service (dial-in by DTE) with no DTE identification method, or identified DTE service (dial-in by DTE) with DTE identification method provided by the PSN.
2 User-specified DTE service is a DTE service that may or may not provide PSPDN dial-out. However, the possible identification methods for DTE dial-in and PSPDN dial-out are different. 6.3.2 Facilities
For non-identified DTE service (dial-in by DTE), non-identified DTE service (dial-out by PSPDN) and identified DTE service, the optional user facilities provided at the DTE/DCE interface are the default values specified by the X.32 Recommendation. For user-specified DTE service, the optional user facilities that should be made available internationally, and those that are available for certain data networks and may also be used internationally are shown in Table 7. Table 7 Facilities for packet-switched data transmission service for user-specified DTE service Optional user facilities
Optional user facilities for use during the agreed contract period Extended frame sequence number
Multilink procedure
Extended packet sequence number (modulo 128)
D bit modification
Packet retransmission
Incoming call blocking
User service category
8 to 12, 26
(synchronous mode) and 30
A (Note 1)Recommendation 32 contains detailed definitions of DTE services and identification methods. 8
1 Non-identified
DTE service
(dialed in by DTE)
Non-identified
(dialed out by PSPDN)
3 Identified
4 User-specified
(Note 2)
No identification.
Dialed in by DTE
Dialed out by PSPDN
Dialed in by DTE
Dialed out by PSPDN
Identification provided by the public switched network.
GB/T11590—1999
Table 6 DTE services and identification methods
User service categories
8~12, 26
(synchronous mode) and 30
(Note 1)
(Note 1)
Identification is provided by the data link layer XID procedure. Identification is provided by the NUI selection facility.
Packet-switched public data network.
(Note 1)
DTE identification
(Note 1)
The DTE or DCE identification method that the network can provide when the network provides the corresponding DTE service. NUI
DCE Identification
1 Administrations providing port access for packet-switched data transmission services for service categories 8 to 12, 26 and 30 shall provide at least non-identified DTE service (dial-in by DTE) with no DTE identification method, or identified DTE service (dial-in by DTE) with DTE identification method provided by the PSN.
2 User-specified DTE service is a DTE service that may or may not provide PSPDN dial-out. However, the possible identification methods for DTE dial-in and PSPDN dial-out are different. 6.3.2 Facilities
For non-identified DTE service (dial-in by DTE), non-identified DTE service (dial-out by PSPDN) and identified DTE service, the optional user facilities provided at the DTE/DCE interface are the default values specified by the X.32 Recommendation. For user-specified DTE service, the optional user facilities that should be made available internationally, and those that are available for certain data networks and may also be used internationally are shown in Table 7. Table 7 Facilities for packet-switched data transmission service for user-specified DTE service Optional user facilities
Optional user facilities for use during the agreed contract period Extended frame sequence number
Multilink procedure
Extended packet sequence number (modulo 128)
D bit modification
Packet retransmission
Incoming call blocking
User service category
8 to 12, 26
(synchronous mode) and 30
A (Note 1)
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