Date of Last Update : 16 May 1995 List of ITU-T H-Series Recommendations in force ** - Series H * Characteristics of transmission channels used for other than telephone purposes H.11 (1984) [Red Book Fasc. III.4] [Publ.: Nov.85] Characteristics of circuits in the switched telephone network H.12 (1984) [Red Book Fasc. III.4] [Publ.: Nov.85] Characteristics of telephone-type leased circuits H.13 (1984) [Red Book Fasc. IV.4] [Publ.: Nov.85] Characteristics of an impulsive noise measuring instrument for telephone-type circuits Note - Same as O.71 H.14 (1984) [Red Book Fasc. III.4] [Publ.: Nov.85] Characteristics of group links for the transmission of wide-spectrum signals H.15 (1984) [Red Book Fasc. III.4] [Publ.: Nov.85] Characteristics of supergroup links for the transmission of wide-spectrum signals H.16 (1984) [Red Book Fasc. III.4] [Publ.: Nov.85] Characteristics of an impulsive-noise measuring instrument for wideband data transmission Note - Same as O.72 * Use of telephone-type circuits for voice-frequency telegraphy H.21 (1984) [Red Book Fasc. III.4] [Publ.: Nov.85] Composition and terminology of international voice-frequency telegraph systems H.22 (1984) [Red Book Fasc. III.4] [Publ.: Nov.85] Transmission requirements of international voice-frequency telegraph links (at 50, 100 and 200 bauds) H.23 (1984) [Red Book Fasc. III.4] [Publ.: Nov.85] Basic characteristics of telegraph equipments used in international voice-frequency telegraph systems * Telephone circuits or cables used for various types of telegraph transmission or simulta. transm. H.32 (1984) [Red Book Fasc. III.4] [Publ.: Nov.85] Simultaneous communication by telephony and telegraphy on a telephone-type circuit H.34 (1984) [Red Book Fasc. III.4] [Publ.: Nov.85] Subdivision of the frequency band of a telephone-type circuit between telegraphy and other services * Telephone-type circuits used for facsimile telegraphy H.41 (1984) [Red Book Fasc. III.4] [Publ.: Nov.85] Phototelegraph transmissions on telephone-type circuits H.42 (1984) [Red Book Fasc. III.4] [Publ.: Nov.85] Range of phototelegraph transmissions on a telephone-type circuit H.43 (1984) [Red Book Fasc. III.4] [Publ.: Nov.85] Document facsimile transmissions on leased telephone-type circuits * Characteristics of data signals H.51 (1984) [Red Book Fasc. III.4] [Publ.: Nov.85] Power levels for data transmission over telephone lines H.52 (1984) [Red Book Fasc. III.4] [Publ.: Nov.85] Transmission of wide-spectrum signals (data, facsimile, etc.) on wideband group links H.53 (1984) [Red Book Fasc. III.4] [Publ.: Nov.85] Transmission of wide-spectrum signals (data, etc.) over wideband supergroup links * Characteristics of visual telephone systems H.100 (1988) [Blue Book Fasc. III.6] [Publ.: Jul.90] Visual telephone systems H.110 (1988) [Blue Book Fasc. III.6] [Publ.: Jul.90] Hypothetical reference connections for videoconferencing using primary digital group transmission H.120 (1993) [Rev.1] [60 pp.] [Publ.: Apr.94] Codecs for videoconferencing using primary digital group transmission H.130 (1988) [Blue Book Fasc. III.6] [Publ.: Jul.90] Frame structures for use in the international interconnection of digital codecs for videoconferencing or visual telephony H.140 (1988) [Blue Book Fasc. III.6] [Publ.: Jul.90] A multipoint international videoconference system * Infrastructure of audiovisual services H.200 (1993) [Rev.1] [4 pp.] [Publ.: Nov.93] Framework for Recommendations for audiovisual services H.221 (1993) [Rev.2] [28 pp.] [Publ.: Apr.94] [PN: H.221 + H.222] Frame structure for a 64 to 1920 kbit/s channel in audiovisual teleservices H.224 (11/94) [New] [Publ. sched.: May.95] A real time control protocol for simplex appplications using the H.221 LSD/HSD/MLP channels Note - C: 58/89/110 H.230 (1993) [Rev.1] [8 pp.] [Publ.: Feb.94] Frame-synchronous control and indication signals for audiovisual systems H.231 (1993) [New] [12 pp.] [Publ.: Feb.94] Multipoint control units for audiovisual systems using digital channels up to 2 Mbit/s H.233 (1993) [New] [11 pp.] [Publ.: Apr.94] Confidentiality system for audiovisual services H.234 (11/94) [New] [Publ. sched.: Jun.95] Encryption key management and authentication system for audiovisual services Note - C: 58/89/110 H.242 (1993) [Rev.1] [33 pp.] [Publ.: Apr.94] System for establishing communication between audiovisual terminals using digital channels up to 2 Mbit/s H.243 (1993) [New] [23 pp.] [Publ.: Feb.94] Procedures for establishing communication between three or more audiovisual terminals using digital channels up to 2 Mbit/s H.261 (1993) [Rev.2] [25 pp.] [Publ.: Feb.94] Video codec for audiovisual services at p x 64 kbit/s H.281 (11/94) [New] [Publ. sched.: Jun.95] A far end camera control protocol for videoconferences using H.224 Note - C: 58/89/100 * Systems and terminal equipment for audiovisual services H.320 (1993) [Rev.1] [12 pp.] [Publ.: Apr.94] Narrow-band visual telephone systems and terminal equipment H.331 (1993) [New] [5 pp.] [Publ.: Feb.94] Broadcasting type audiovisual multipoint systems and terminal equipment ---------------------------------------------------------------------- Some 1120 Recommendations from the Blue Book are still in force. 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