A line concentrator and external devices wherein data transmitted from external devices within a system and wherein the processing of {HEAD ~ the received data} can be efficiently executed without increasing load on {TAIL ~ the network} is provided 
A line concentrator and external devices wherein data transmitted from external devices within a system and wherein the processing of { HEAD ~ the received data } can be efficiently executed without increasing load on { TAIL ~ the network } is provided
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH