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GB/T 7621-1987 standard english preview version PDF file 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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