Preliminary Translation TLA + "Specifying Systems" --Section 4.0 A FIFO

The next example is a FIFO buffer, referred to as FIFO, which is a device, which transmits the sender process using a range of value to the recipient. Sender and receiver use $in$ sum $out$ communication channels and two buffers:

transmission values will follow the first page in FIG. 30 3.2 $Channel$ module specified asynchronous protocol. This would allow the system specification of the following acts: a non-overlapping four kinds having its steps, i.e. in $in$ channel and $out$ on the channel $Send$ and $Rcv$ step.