GB/T 7621-1987 Standard PDF file download ; GB/T 7621-1987 Standard english preview version download

GB Standard Code	GB/T 7621-1987
Standard Category	China National Standards
GB Standard English Title	1200 bits per second duplex modem standardized for use in the general switched telephone network and on point-to-point 2-wire leased telephonecircuits
GB Standard Chinese Title	在电话自动交换网和点对点二线租用电话型电路上使用的标准化的1200比特/秒双工调制解调器
Chinese Version Price	$15 USD per 50 pages
English Translation Price	About $15 per 1 page; Inquire us for detail price

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