In a further embodiment, two data channels are provided for data transfer from {HEAD ~ a first switch}, whereby through the first data channel the data packets are transferred to the access point to the packet switching network, and through the second data channel the data are transferred to {TAIL ~ the second switch} through line switching 
In a further embodiment , two data channels are provided for data transfer from { HEAD ~ a first switch } , whereby through the first data channel the data packets are transferred to the access point to the packet switching network , and through the second data channel the data are transferred to { TAIL ~ the second switch } through line switching
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 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 TAIL OTH OTH OTH