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