STAT-4, STAT-8, AND STAT-24
8
2.3 Typical Applications
Figure 2-1 shows a typical application that uses a Stat-24 to multiplex the data lines used to connect a large
number of asynchronous terminals (up to 24) to the host computer. The data lines use various data rates. The
Stat-24 statistically multiplexes sub-channel data to form a composite data stream having a rate much smaller
than the arithmetical sum of the individual sub-channel rates. The required composite link rate depends on the
Stat-24’s buffer capacity versus sub-channel traffic statistics and allowable delay.
The composite data is sent via modems to the remote Stat-24, where it is demultiplexed and distributed to the
local users at their nominal rate (that may differ from the nominal host transmission rate).
Reliable operation of any statistical multiplexor requires the equipment connected to its sub-channels to use
some form of flow control. One of the main advantages of the Stat-4, Stat-8, and Stat-24 is that the flow-control
method used at each of the two sub-channel ends can differ (for example, hardware control at one end,
software control at the other end), and the conversion is transparently performed by the stat muxes.
Figure 2-1. Typical stat mux application.
