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 each device is provided with means enabling the device to detect automatically {TAIL ~ 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 each device is provided with means enabling the device to detect automatically { TAIL ~ its position } on the data bus
OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH