A communications apparatus comprising a plurality of communication devices {HEAD ~ each} having a plurality of ports and a data bus interconnecting the plurality of units, wherein {TAIL ~ each device} is provided with means enabling the device to detect automatically its position on the data bus 
A communications apparatus comprising a plurality of communication devices { HEAD ~ each } having a plurality of ports and a data bus interconnecting the plurality of units , wherein { TAIL ~ each device } is provided with means enabling the device to detect automatically its position on the data bus
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