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早期的V.35接口

2010年2月4日 / 92次阅读

V.35接口,The Fast Serial Interface,早期的宽带接口。

Basically, V.35 is a high-speed serial interface designed to support both higher data rates and connectivity between DTEs (data-terminal equipment) or DCEs (data-communication equipment) over digital lines. 【Cisco的教材里面还能看到这些名词,估计在美国很普遍。由DCE侧提供clock rate】

V.35接口

V.35接口

V.35 is an interface (V.35 is the ITU - formerly CCITT standard termed "Data Transmission at 48 Kbps Using 60-108 KHz Group-Band Circuits") commonly used on higher speed circuits of 56kbps and above. Recognizable by its blocky, 34-pin connector; V.35 combines the bandwidth of several telephone circuits to provide the high-speed interface between a DTE or DCE and a CSU/DSU (Channel Service Unit/Data Service Unit). To achieve such high speeds and great distances, V.35 combines both balanced and unbalanced voltage signals on the same interface. Transmission is usually a synchronous protocol (note clocking pins i.e. receive and transmit clock). Although V.35 is commonly used to support speeds ranging anywhere from 48 to 64 Kbps, much higher rates are possible [ISDN (64 or 128Kbps), Factional T1@ 128 Kbps to 1.544Mbps T1, ATM and Frame Relay]. V.35 cable distances theoretically can range up to 4000 feet (1200 m) at speeds up to 100 Kbps. Actual distances will depend on your equipment and the quality of the cable. Lan routers often come equipped with a V.35 electrical interface but many today are using a HSSI interface at speeds higher than T1 and above (typical T3 45Mbps).

V.35接口面板(古老的设备前面板)

V.35接口面板(古老的设备前面板)

V.35是通用终端接口的规范,其实V.35是对60-108KHz群带宽线路进行48kbps同步数据传输的调制解调器的规范,其中一部分内容说明了终端接口的相关规范。

V.35对机械特性,即对连接器的形状并未作出规定。因此,我们应该经常能够在低端路由器,Modem,MUX上见到各种形态的V.35接口。

路由器中的V.35接口,一般采用DB34或者DB25的接口类型,用来传输同步的N*64kbps信号。

本文链接:https://www.maixj.net/ict/v-35-5312

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