1、 AMERICAN NATIONAL STANDARD FOR TELECOMMUNICATIONS ATIS-0700703.1995(R2015) Allocation of Letters to the Keys of Numeric Keypads As a leading technology and solutions development organization, ATIS brings together the top global ICT companies to advance the industrys most-pressing business prioritie
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11、mbering,Addressing Service/Systems Objectives; Privacy and Authentication.It was developed with the aim of achieving a common allocation of letters to the keys of anumeric keypad in terminals used to access personal communications services.Furthermore, its application to all terminals/devices used t
12、o access telecommunication ser-vices makes it of general interest.The contents of this standard conform to international standards, specifically the allocationsalready standardized in the International Telecommunication Union (ITU) for telephones andthe International Organization for Standardization
13、/International Electrotechnical Commission(ISO/IEC) for text and office systems.1 Scope and purposeIncreasingly, telecommunications services are making use of letters, as well as numbers, onnumeric keypads for tasks such as directory, dial-by-name, entry of alphabetic numbers, and thelike. In additi
14、on, it is recognized that many users of telecommunication services prefer to use let-ters instead of digits to code and remember numbers. Hence, there is a need for a standard allo-cation of letters to the keys of numeric keypads used for telecommunications.Page 1 of 2 pagesANSI T1.703-1995This stan
15、dard provides an allocation of the 26 letters of the Latin alphabet to the keys of suchnumeric keypads.This standard covers only the allocation of letters to the keys of the numeric keypad. Other humanfactors, such as design of symbols, engraving, use of colors, position of figures, letters and sym-
16、bols, and the size of keys, are considerations outside the scope of this standard.The association of a letter with a digit is made only as a mnemonic aid to the user of the keypad.No numerical value is given to the letter. When a key is actuated, the signal sent to the associat-ed system shall be th
17、e same as the signal which is sent for the digit which is allocated to the key.This standard is consistent with the allocations already standardized in the InternationalTelecommunication Union (ITU) for telephones (ITU-T Recommendation E.161) and theInternational Organization for Standardization/Int
18、ernational Electrotechnical Commission(ISO/IEC) for text and office systems (ISO/IEC 9995-8), refer to clause 2.2 Normative referencesISO/IEC 9995-8: 1994, Information technology Keyboard layouts for text and office systems Part 8: Allocation of letters to the keys of a numeric keypad1)ITU-T Recomme
19、ndation E.161-1993, Telephone network and ISDN operation, numbering, routingand mobile service Arrangement of digits, letters and symbols on telephones and other devicesthat can be used for gaining access to a telephone network1)3 Allocation of letters to keysThe relationships between the 26 letters
20、 of the Latin alphabet and the digits on the keys of thenumeric keypad are as shown in the following table:1 2 ABC 3 DEF4 GHI 5 JKL 6 MNO7 PQRS 8 TUV 9 WXYZ0This allocation should be followed regardless of the physical layout of ten digit keys.Page 2 of 2 pagesANSI T1.703-19951)Available from the American National Standards Institute, 11 West 42nd Street, New York, NY 10036.
