China 2400 bits per second GB Standards Search Result |
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GB/T 9541-1988 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 - 英文版 |
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GB/T 7625-1987 2400/1200 bits per second modem standardized for use in the general switched telephone network - 英文版 |
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GB/T 7624-1987 2400 bits persecond modem standardized for use on 4-wire leased telephone type circuits - 英文版 |
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