Synchronous and asynchronous automatic dialling procedures on switched networks
交换网络上的同步和异步自动拨号程序
1996-10-18
ITU-T S.13
Use on radio circuits of 7-unit synchronous systems giving error correction by automatic repetition
用于7单元同步系统的无线电电路 通过自动重复进行纠错
1988-11-25
ITU-T U.20
Telex and gentex signalling on radio channels (synchronous 7-unit systems affording error correction by automatic repetition)
无线信道上的电传和gentex信号（通过自动重复提供纠错功能的7单元同步系统）
1988-11-25
ITU-T U.22
Signals indicating delay in transmission on calls set up by means of synchronous systems with automatic error correction by repetition
通过同步系统建立的呼叫传输延迟信号 通过重复自动纠错
1988-11-25
DIN ETS 300746
Transmission and Multiplexing (TM) - Synchronous Digital Hierarchy (SDH) Network protection schemes - Automatic Protection Switch; APS protocols and operation; English version ETS 300746:1997
传输和多路复用（TM）-同步数字体系（SDH）网络保护方案-自动保护开关；APS协议和操作；英文版ETS 300746:1997