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Serial half or full duplex?

The question is in serial port connection (like frame relay) the data transmission is in a half duplex o full duplex way? Please let me know about any link talking about it. Thanks

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Re: Serial half or full duplex?

Full duplex. I don't have a link offhand, but the PDH (T1/E1, T3/E3, etc) is full duplex and that's usually what protocols like Frame Relay end up running on top of.

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