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[6] [DFN[[[Network ASCII]]]] ([DFN[[[Net-ASCII]]]]、[DFN[[[Telnet ASCII]]]]、[DFN[[[NVT ASCII]]]])
は、 [[Telnet]] で用いられている [[ASCII]] の[[プロファイル]]あるいは変種です。
標準の [[ASCII]] に当時の [[ARPANET]] で使われていた端末での通信の互換性を考慮した[[制御文字]]の解釈や制限を加えたものであり、
[[Telnet]] に限らず [[SMTP]] や [[FTP]] など多くの[[プロトコル]]で暗黙的または明示的な前提となってきました。

* 仕様書

[REFS[
- [1] [CITE@en[RFC 97 - First Cut at a Proposed Telnet Protocol]] ([TIME[2011-05-29 12:19:01 +09:00]] 版) <http://tools.ietf.org/html/rfc97#section-3>
- [2] [CITE@en[RFC 137 - Telnet Protocol - a proposed document]] ([TIME[2011-05-08 18:43:27 +09:00]] 版) <http://tools.ietf.org/html/rfc137#page-4>
- [3] [CITE@en[RFC 139 - Discussion of Telnet Protocol]] ([TIME[2011-03-13 21:30:33 +09:00]] 版) <http://tools.ietf.org/html/rfc139#page-2>
- [4] [CITE@en[RFC 318 - Telnet Protocols]] ([TIME[2011-03-15 09:29:40 +09:00]] 版) <http://tools.ietf.org/html/rfc318#appendix-I>
- [5] [CITE@en[RFC 5198 - Unicode Format for Network Interchange]] ([TIME[2011-05-01 10:22:43 +09:00]] 版) <http://tools.ietf.org/html/rfc5198#appendix-A>
]REFS]

* 関連

[12] [[RFC 698]]

[7] [[RFC 5198]] では[[符号化文字集合]]を [[Unicode]] に拡張した [[Net-Unicode]]
が定義されています。

* メモ

[8] [CITE@en[RFC 373 - Arbitrary Character Sets]]
([TIME[2015-11-15 15:58:51 +09:00]] 版)
<https://tools.ietf.org/html/rfc373>

[11] [CITE[°3ꪼ䍯灹物杨琠ㄹ㤲ⴱ㤹㜠䅤潢攠卹獴敭猠䥮捯牰潲慴敤⸠䅬氠剩杨瑳⁒敳敲癥搮 - rfc570.pdf]], [TIME[2021-02-21T20:44:53.000Z]], [TIME[2021-03-10T05:40:07.170Z]] <https://tools.ietf.org/pdf/rfc570.pdf>

[FIG(quote)[
[FIGCAPTION[
[9] [CITE@en[RFC 959 - File Transfer Protocol]]
( ([TIME[2016-06-05 16:18:06 +09:00]]))
<https://tools.ietf.org/html/rfc959#page-3>
]FIGCAPTION]

> 
:ASCII:
The ASCII character set is as defined in the ARPA-Internet
Protocol Handbook.  In FTP, ASCII characters are defined to be
the lower half of an eight-bit code set (i.e., the most
significant bit is zero).

]FIG]

[10] [CITE@en[RFC 5234 - Augmented BNF for Syntax Specifications: ABNF]]
( ([TIME[2013-01-23 19:51:03 +09:00]] 版))
<https://tools.ietf.org/html/rfc5234>

[13] [CITE@en[RFC 2579 - Textual Conventions for SMIv2]]
([TIME[2021-04-04T10:28:37.000Z]], [TIME[2021-04-16T07:38:13.500Z]])
<https://tools.ietf.org/html/rfc2579#page-4>

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