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Z
Z Modem
The Z
modem protocol is a data communications file transfer protocol developed
for transmitting files between PCs. It is similar to both the X modem and Y
modem protocols. Z modem however is implemented using full duplex
communication and does not require each block of data to be acknowledged as
does the X modem and Y modem file transfer protocols. Z modem continues to
send blocks of data until a negative acknowledgment is received (NAK). It
then retransmits all blocks prior to the block which was NAKed.
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