包括连接到外部网络、用户接口和寻址的建议，以及可视图文（包括使用1级图文电视作为传送方式）和图文电视服务的协议。还提供了一些关于绩效目标的指导。交叉引用:BS 4727:第3部分:第04BS 6513组:第1BS 6513部分:第4BS 6513部分:第6BS 6514BS 6552BS 6568BS 6623:第1IEC 50（60）部分EIA-232-Accept T/CD 06-01CCITT红皮书卷X.1CITT建议F200CCITT建议G821CITT建议T50CCITT建议T60CCITT建议T61CITT建议T70CCITT建议V24CCITT建议V25CCITT建议X3CCITT建议X25CCITT建议X28CCITT建议X29CCITT建议X121CCITT建议X400CCITT建议X430

Includes recommendations for connection to external networks, subscriber interfaces and addressing, and protocols for videotex (including the use of level 1 teletext as a method of delivery) and teletex services. Also provides some guidance on performance targets.Cross References:BS 4727:Part 3:Group 04BS 6513:Part 1BS 6513:Part 4BS 6513:Part 6BS 6514BS 6552BS 6568BS 6623:Part 1IEC 50(60)EIA-232-CCEPT T/CD 06-01CCITT Red book Vol.X.1CCITT Recommendation F200CCITT Recommendation G821CCITT Recommendation T50CCITT Recommendation T60CCITT Recommendation T61CCITT Recommendation T62CCITT Recommendation T70CCITT Recommendation V24CCITT Recommendation V25CCITT Recommendation X3CCITT Recommendation X25CCITT Recommendation X28CCITT Recommendation X29CCITT Recommendation X121CCITT Recommendation X400CCITT Recommendation X430