| 术语 | baseband LAN |
| 释义 | baseband LAN 基带局域网 A local-area network that uses baseband coaxial cable as the communication medium. The network typically uses a bidirectional signal path on which signals are encoded on to the cable using Manchester encoding or other baseband methods. A variety of packet-mode media access techniques may be used, but the most common implementation is Carrier Sense Multiple Access with Collision Detection (CSMA／CD), in which all network subscribers share a channel. Subscribers decide to transmit after sensing that a channel is free. If collisions of data packets occur, subscribers retransmit after a randomized delay. This is an effective way to allocate capacity on a channel to low duty cycle devices, in which the channel capacity is matched to the aggregate demand of many subscribers,e.g., Ethernet local-area network is a baseband CSMA／CD channel that operates on 50-ohm coaxial cable at a system data rate of 10M bits per second. 一种使用基带同轴电缆作为通信媒介的局域网。典型的这种局域网使用双向信号通路, 使用曼彻斯特编码技术或其它的基带方法对信号进行编码后送入电缆。可以使用各种信息 包方式的中速存取技术,但最广泛使用的方法是带有检测冲突的载波侦听多路存取(CSMA/CD) 技术,使用这种方法可以使网中的所有用户共享一个信道。用户检测到信道空闲后就决定发 送,如果出现数据包冲突,用户在随机一段时间延迟之后可以重新发送,这是一种有效的“给 低占空度设备分配信道容量”的方法,按照这种方法,该信道的容量等于许多用户的总需求。 例如,以太局域网就是一种基带型的CSMA／CD信道,其工作电缆是50欧姆的同轴电缆,系统数 据速率为10兆位／秒。 |
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