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          <TD style="FONT-SIZE: 18px" align=middle height=35><FONT 
            color=#fe3000><B>USB接口</B></FONT> </TD></TR>
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            <SCRIPT>document.write('2005-4-21 17:10:00')</SCRIPT>
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          <TD style="FONT-SIZE: 14px; LINE-HEIGHT: 150%">&nbsp;&nbsp;&nbsp; 
            USB的全称是Universal Serial 
            Bus,最多可连接127台外设,由于USB支持热插拔,即插即用的优点,所以USB接口已经成为扫描仪的标准接口。USB有两个规范,即USB1.1和USB2.0。&nbsp; 

            <P>&nbsp;&nbsp;&nbsp; 
            USB1.1是目前较为普遍的USB规范,其高速方式的传输速率为12Mbps,低速方式的传输速率为1.5Mbps。注意:这里的b是Bit的意思,1MB/s(兆字节/秒)=8MBPS(兆位/秒),12Mbps=1.5MB/s。目前,家用低端扫描仪主要为USB接口类型。&nbsp; 
            </P>
            <P>&nbsp;&nbsp;&nbsp; 
            USB2.0规范是由USB1.1规范演变而来的。它的传输速率达到了480Mbps,折算为MB为60MB/s,足以满足大多数外设的速率要求。USB 
            2.0中的“增强主机控制器接口”(EHCI)定义了一个与USB 1.1相兼容的架构。它可以用USB 2.0的驱动程序驱动USB 
            1.1设备。也就是说,所有支持USB 1.1的设备都可以直接在USB 2.0的接口上使用而不必担心兼容性问题,而且像USB 
            线、插头等等附件也都可以直接使用。&nbsp; </P>
            <P>&nbsp;&nbsp;&nbsp; 
            但目前主流扫描仪接口技术仍旧停留在USB1.1,其12Mbps的传输速率已经不能满足人们的需要。于是,一部分用户将目光投向了传输速度、性能更强、支持USB 
            2.0/IEEE1394接口的扫描仪上。虽说目前此类产品并不多,但不同牌子的扫描仪看起来差异性很大。<BR></P>
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