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常见的有T1、Frac-tional T1、T3,其中T1、T3属于T载波系统(T-Carrier System),是贝尔实验室于1960年代所研发,为了在数位传输线上传送语音讯号所发展的多工传送方式,其资料传送速度分別是1.544Mbps,44.736Mbps,Fractional T1是指將T1的频宽加以分割,提供给频宽需求低于T1速度的使用者。    T-Carrier(北美版)  FT1=<64Kbps  T1=1.554Mbps  T1C=3.152Mbps  T2=6.312Mbps  T3=44.736Mbps  T3C=89.472Mbps  T4=274.176Mbps    T-Carrier(欧洲版)  E1=2.048Mbps  E2=8.448Mbps  E3=34.368Mbps  E4=44.736Mbps  E5=565.148Mbps    再补充几个:  STM1=155.52M  STM4=622.08M  FastEthernet=100M  GigaEthernet=1000M  FastEthernet指的是高速以太网路,传输速度是100Mbps。    FDDI:光纤分散资料介面,指的是以光纤缆线作为传输媒介的一种基频网路传输技术,传输速度可达100Mbps。    CDDI(FDDI over Copper):指以双绞线为传输介质,传输速度亦可达100Mbps,一般使用Level 5的双绞线。    OC-Level (OC1,OC3,OC12):利用光纤缆线作为传输媒介,OC1的传输能力是51.84Mbps,而OC3是155.5Mbps,为OC1的3倍,OC12是622Mbps,为OC3的4倍。    ATM:是一种高速的资料传输技术。最快传输速度为155Mbps,传输能力比3条T3专线加起来还快。    STM1,STM4:以光纤缆线为传输媒体,STM1的速率是155.5Mbps,STM4是622Mbps。
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