At the 2012 NAB Show, manufacturer ESE will be showing new distribution amps for RS-232C format signals.
The ES-250 and ES-251 are 1×24 distribution units. The ES-250 provides 24 terminal blocks for the outputs while the ES-251 uses 24 nine-pin D-sub connectors for distribution. The outputs are gathered into three eight-output amplifier groups.
According to a release, “The units receive RS-232C and buffer the signal so that each of the 24 outputs can drive a single ‘user’ at a distance of up to 50 feet (per output).”
NAB Booth: C6437