Telecommunications system.

And the mobile phone with a pulse train formed on the single radio channel alternating 11 and base station 3 time division duplex housing. Once a ring, an initial transmission buss synchronous logical channel and S communication logical channel D; a conversion to carrier communication logical channel B and corresponding logical channel D the pulse for train unit. Each through the coil of S achieves the data synchronization train. With the mode of character to reduce is not correctly asynchronous detection possibility. And a part of scram and a mobile signal from the other part, and sending the specific signal to inform other part, in which the basic at the same time detecting to the link fault, so it rebuild to the operation to synchronize.