where number can be from 64 to 4096 bytes.
You can also use the packetsize command to establish a "frozen"
or fixed packet size for transmit and receive file transfers.
Normally, Autolog will adaptively change the packet size for the most efficient
transfer. When using a pseudo-duplex modem, or under other special circumstances,
you may not want to have the packet size altered. To to specify a fixed,
nonvariable packet size for transmit and receive file
transfers, use the /f switch: