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ATM Forum已对一项中等速度的标准局域接口取得了一致意见.该接口所支持的带宽可以缩放,从51.8Mbps一直缩减到较低的速率.在3类线缆上传输51Mbps决非易事,需要使用数字信号处理的复杂编码方式.支持CAP—16的芯片仍然处于实验室阶段,因而很难了解这种新的51.8MbpsATM适配器的售价.出于在UTP—5上传输155Mbps将使用简单得多的NRZI编码方式,因此很有可能51Mbps适配器的售价要比带宽为其3倍的OC—3C适配器的售价差不多或更贵一些.当然,就ATM交换机来说,事情稍为复杂一点,因为支持速度较快的端口总是会影响交换机的设计.
The ATM Forum has agreed on a medium-speed standard local area interface that can scale the bandwidth it supports from 51.8 Mbps down to lower rates. It is never easy to transport 51 Mbps on Category 3 cables , Requires the use of complex encoding of digital signal processing.Cap-16-enabled chip is still in the laboratory stage, it is difficult to understand the price of this new 51.8MbpsATM adapter.Since transmitting 155Mbps on UTP-5 will be simple to use Much NRZI encoding is possible, so it is likely that the 51Mbps adapter will cost about as much or as much more expensive than the OC-3C adapter, which is three times the bandwidth. Of course, things are a bit more complicated with ATM switches, Because support for faster ports will always affect the switch design.