基于以太网收发器速率连续可变的地震仪数据传输方案

Seismic data transmission scheme based on Ethernet transceiver with a continuously variable data rate

市场上有缆地震仪主要数据传输方案包括采用RS485的低速传输,采用LVDS技术的高速传输,采用以太网技术的传输[1].然而它们都有一定的局限性.RS485传输速率有限,一般最高在10~20Mbps之间;LVDS技术速度最低一般在100Mbps以上,这对地震仪中长距离电缆提出了很高的要求;以太网技术只能在10Mbps、100Mbps和1000Mbps三个速率下工作.而多道地震仪常用的速率随着通道数增加在10~1000Mbps之间,那么现有的技术都无法实现在此范围内连续可变,这就必然带来对电缆传输性能无谓的提高要求.针对这个问题本文提出一种方法,能够实现地震仪数据传输速率在10~1000Mbps之间连续可变.

Mainstream data transmission schemes for cable seismographs on the market include low-speed transmission using RS485,high-speed transmission using LVDS technology and transmission using LAN technology.But there are restrictions for them all.RS485 gets a lower limit on data rate,usually no more than 20Mbps.LVDS usually gets a data rate no less than 100Mbps,this puts high demands on long-distance cables in seismographs.Ethernet technology can only work at 10Mbps,100Mbps and 1000Mbps rates.While the datarate commonly used in multi-channel seismographs increases from 10Mbps to 1000Mbps,the existing technology cannot be continuously variable within this range,which inevitably leads to unnecessary increase in cable transmission performance.In response to this problem,this paper proposes a method to achieve continuous change of seismic data transmission rate between 10Mbps and 1000Mbps.