Abstract: In a method of interleaving and deinterleaving STM-1 and STM-N SDH frame pointers transmitted between a transmitter and a receiver, each frame comprising a section overhead area, a pointer area and a payload area including the data to be transmitted. At the transmitter, the bits of the pointer area and those of the payload area are interleaved according to an interleaving law retaining the position modulo 24 in the interleaved bits. The interleaving produces an interleaved frame transmitted to the receiver at which it is deinterleaved using a law that is the reciprocal of the interleaving law. This interleaves all the bits of pointers in the frame without changing the values of the B1 and B2 parity control bytes.