GB/T 9541-1988
在普通电话交换网和点对点二线租用电路型电路上使用标准化的回波抵消技术的
2400 bits per second duplex modem using the echo cancellation technique standardized for use on the general switched telephone network and on point-to-point 2 wire leased telephone-type-circuits
GBT9541-1988, GB9541-1988