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