Numbering system for TTC Standards

Common concepts
(1) Basically, TTC standards conform to international standards. Therefore, numbering TTC Standards should allows their corresponding international standard document numbers to be identified at a glance.

(2) ITU-T and ISO are the two international standardization organizations in which TTC is deeply involved. Accordingly, TTC Standards corresponding to Recommendations and Standards of these two organizations are identified as such with the two-letter prefix as follows:

ITU-T : JT

ISO : JS

When a TTC Standard corresponds to both an ITU-T Recommendation and an ISO Standard, it is necessary to give it, in principle, either of an appropriate JT or JS document number, by determining a single reference source.
When any quotation is made in a TTC Standard from international standards (including TTC Standards developed in conformity with international standards, etc.) of which scope of application is different from that of the TTC Standard, or when such international standards are referenced into a TTC standard with a limited scope of application, its TTC standards number is to be followed by a "Branch Character" , which is a lower-case alphabet to be assigned in the alphabetical order.

(3) For TTC Standards corresponding to standard documents developed by TTC in conjunction with a regional standardization organization, or by a regional standardization organization other than TTC alone, their TTC standards number consists of the two-letter prefix given below followed by the number of relevant standard document.
JP

(4) For TTC Standards corresponding to the documents of standardization organizations/bodies (Forums/Consortia, etc.) other than ITU-T, ISO and regional standardization organizations, their TTC standards number consists of the two-letter prefix given below followed by the number of the relevant international standard document.
JF

(5) TTC Standards developed without referring to standard documents developed by other standardization organizations, are given a standards number unique to TTC, preceded by the two-letter prefix given bellow.
JJ

(6) The numbers following JT-, JS-, JP-, JF- or JJ- are to be chosen to minimize any confusion.
(Refer to JJ- below.)

(7) When a TTC Standard is developed by combining several international standard documents, in order to avoid misunderstanding by readers, it is provided with a TTC standards number that correlates with, or is derived from the number of the main document referenced.

(8) When this numbering system needs to be changed, the new numbering system is to be applied to all the existing TTC standards retroactively.

Standard numbering system corresponding to ITU-T numbering
2.1 Basic concepts
(1) JT is given as the two-letter prefix.

(2) The number following JT- is that corresponding to the number of the ITU-T Recommendation, etc., referenced.

(3) The TTC standards number given to a TTC Standard that is developed as a single profile in conformity with more than one ITU-T Recommendation is configured as follows:.

JT-Pxyz:

D : OSI profile for applications using ISDN.

1 - 4	:	Lower-layer (Layers 1 - 4) profiles
5 - 7	:	Upper-layer (Layers 5 - 7) profiles
0	:	Profiles common to both lower and upper layers

(4) When several documents are combined, it is necessary to avoid causing readers any misunderstanding, by making it a principle to give, for example, a TTC standards number that correlates with, or is derived from the number of the main document referenced.

(5) Detailed descriptions including the year of issue of the Recommendation referenced, are indicated, not in the TTC standards numbering system, but in the text section of the TTC Standard describing the corresponding document number of the Recommendation.

(6) When any quotation is made in a TTC Standard from ITU-T Recommendations (including TTC Standards developed in conformity with ITU-T Recommendations) of which scope of application is different from that of the TTC Standard, or when ITU-T Recommendations are referenced into a TTC standard with a limited scope of application, or when one profile is turned into another service protocol, etc., with its scope of the application being specifically defined, its TTC standards number is followed by a "Branch Character", which is a lower-case alphabet to be assigned in the alphabetical order. (In accordance with Items (1), (2), (6) and (7) in 1. Common Concepts above)

(7) It is recognized that there exist two or more ITU-T Recommendations which have the same document number, but are different from each other in the study period when they were approved. Therefore, when a TTC Standard is developed in conformity with either of such Recommendations, the TTC standards number may be supplemented, if necessary, with parenthesized reference to a specific version of the ITU-T Recommendation to which the Standard conforms.

2.2 Number configuration
(1) Example 1

International standard documents referenced		TTC standards numbers
*ITU-T I. 334		* JT-I400
*ITU-T I. 365		* JT-I365.

(2) Example 2

International standard documents referenced		TTC standards number
* ITU-T I. 334
X. 224		*JT-PD12

(3) Example 3

Related international standard, etc., documents		TTC standards numbers

* ITU-T I. 431		* JT-I431-a

(4) Example 4

International document referenced	TTC standards number
* ITU-T X.25 1988 version	* JT-X25 (88)

Standards numbering system corresponding to ISO
3.1 Basic concepts
(1) JS is given as the two-letter prefix.

(2) The number following JS is the number of the ISO Standard, etc., referenced.

(3) The TTC standards number given to a TTC Standard that is developed as a single profile in conformity with more than one ISO Standard is configured as follows:

JS-Pxyz:

x	D : OSI profile for applications using ISDN.
y	1 - 4 : Lower-layer (Layers 1 - 4) profiles 5 - 7 : Upper-layer (Layers 5 - 7) profiles 0 : Profiles common to both lower and upper layers

(4) When several ISO documents are combined into a TTC Standard, it is necessary to avoid causing readers any misunderstanding, by making it a principle to give, for example, a TTC Standards number that correlates with the number of the main document referenced.

(5) The number of the ISO Standard document following JS may include the revised version number, the DAD number, etc.

(6) Detailed descriptions including the year of issue of the documents referenced, are indicated, not in the TTC standards numbering system, but in the text section of the TTC Standard describing the corresponding document number of the ISO Standard

(7) When any quotation is made in a TTC Standard from ISO Standards (including TTC Standards developed in conformity with ISO Standards) of which scope of application differs from that of the TTC Standard, or when ISO Standards are referenced into a TTC standard with a limited scope of application, or when one profile is turned into another service protocol, etc., with its scope of application being specifically defined, its TTC standards number is followed by a "Branch Character", which is a lower-case alphabet to be assigned in the alphabetical order. (In accordance with Items (1), (2), (6) and (7) in 1. Common Concepts above)

3.2 Number configuration
The number is configured in the form of "JS-the number of ISO Standard referenced. The following are examples of this configuration.
(1) Example 1

International standard documents referenced

TTC standards numbers

* ISO/IS/6256-1981		*JS-6256
* ISO/IS/8208		*JS-8208
*ISO/DIS/8348/DAD1		*JS-8348/DAD1 (addendum number)
*ISO/DIS/8802/2		* JS-8802/2 (part number)
*ISO/DIS/8072.1		*JS-8072.1 (revised version number)

(2) Example 2

*International standards referenced

TTC standards number

* ISO/IS/7595
		* JS-PX00
10164

(3) Example 3

Related international standards

TTC standard numbers

* ISO/DIS/8880		* JS-8880-a

Numbering system for standards/specifications developed in conjunction with, or by, regional standardization organizations
4.1 Basic concept
(1) JP is given as the two-letter prefix

(2) The JP numbering system accommodates the TTC Standards that "were developed through
inquiries conducted internationally about the contents of their drafts," based on documents, etc., developed in the following manners:
- documents developed by TTC in conjunction with regional standardization organization;
- documents developed by regional standardization organizations other than TTC.

(3) The numbering system for such TTC Standards is to be organized in a form that will not cause any confusion with the JT, JS, JF, and JJ numbering systems.

(4) When several documents are combined into a TTC Standard , it is necessary to avoid causing readers any misunderstanding, by making it a principle to give it, for example, a number that a TTC standards number that correlates with, or is derived from the number of the main document referenced.
(In accordance with Items (1), (3), (6) and (7) in 1. Common concepts above)

4.2 Number configuration
(1) Numbering shall be as follows:

JP - Z1 ~ Zn - X1 ~ Xm
a. Z1 ~ Zn: represents name of organization (as short as possible; n= about 3)
b. X,1 ~ Xm: represents unique number of standard

(2) For Z1~Zn

3GA : 3GPP
3GB : 3GPP2
Other classifications will be determined as necessary.

Numbering system for internationally recognized standards/specifications other than ITU-T Recommendations, ISO Standards, and standards developed by regional organizations
5.1 Basic concepts
(1) JF is given as the two-letter prefix.

(2) The JF numbering system accommodates in principle the TTC Standards that "were developed through inquiries conducted internationally about the contents of their drafts," based on documents developed by international forums, and other organizations.

(3) The numbering system for such TTC Standards is to be organized in a form that will not cause any confusion with the JT, JS, JP, and JJ numbering systems.

(4) When several documents are combined into one TTC Standard, it is necessary to avoid causing readers any misunderstanding by making it a principle to give it, for example, a TTC standards number that correlates with, or is derived from the number of the main document referenced.
(In accordance with (1), (4), (6) and (7) in 1. Common concepts above)

5.2 Number configuration
(1) Numbers are given as follows:

JF - Z1-Zn Y1-Ym X1X2
a. Z1-Zn : represent name of organization

(as short as possible: n =about 3)

b. Y1-Ym : represent document number or representative number from the above organization

(about m = 3)

c. X1X2 : represent unique number of Standard

(2) For Z1-Zn

NMF: Network Management Forum
IR: IrDA (Infrared Data Association)
AF: ATM Forum

Other classifications will be determined as necessary.

Numbering system for standards that do not come under Items 2 - 5 above
6.1 Basic concepts
(1) JJ is given as the two-letter prefix.

(2) In principle, the JJ Numbering System accommodates cases in which TTC determines that its own Standard be developed in the absence of any international standardization organization responsible for a particular subject of standardization.

(3) The numbering system applicable to TTC Standards developed for itself is to be organized in a form that will not cause any confusion with the JT, JS, JP and JF numbering systems.

(4) When several documents are combined into one TTC Standard, it is necessary to avoid causing readers any misunderstanding, by making it a principle to give it, for example, a TTC standards number that correlates with, or derived from the number of the main document referenced.
(In accordance with Items (1), (5), (6) and (7) in " 1. Common concepts" above)

6.2 Number configuration
(1) In the absence of any organization conducting international standardization activities for a particular subject of standardization, the TTC standards number given to the TTC Standards developed for itself is configured as follows:

JJ-

(Matters to be noted in giving Y1, Y2, X1, and X2)

a. Y1: Classified by a digit without using an alphabet

(Y2, X1 and X2 are also represented by a digit)

[Reason]

Use of an alphabet is likely to allow, for example, JT-Ixxxx and JJ-Ixxxx (ISDN related), and the like to appear, and can cause confusion.

b. [.] be inserted between Y1-Y2 and X1-X2.

[Reason]

To avoid confusion with xxxx in JSxxxx

c. Four digits are given after JJ.

[Reason]

When numbering original TTC Standards, it is necessary to take account of developments of telecommunications and domestic requirements for original TTC standards in the future, but these matters are difficult to foresee at the present time. Therefore, the 100 study subjects are temporarily to be sorted using Y1 and Y2 for the time being, and TTC is striving to set up a numbering system that allows 100 detailed standards numbers to be taken using X1 and X2.

(2) Y1, Y2=	10: General
	20: Inter-PBXs (Digital)
	21: Inter-PBXs (Analog)
	30: Analog telephone network-related
	40: Image communications-related
	50: Leased line-related
	60: Data communications-related
	70: Mobile communications-related
	80: MHS/OSI-related

Further classification will be determined as necessary.

SUPPLEMENTARY PROVISION

These Rules shall take effect on September 9,1997.

These Rules shall take effect on September 4, 1998.

These Rules shall take effect on November 1, 1999

These Rules shall take effect on February 1, 2000