A unique byte is used to bookend commands and data for the purpose of allowing inband signalling and command communication between the IWF and the BSC portions of a mobile communication system having DS0 maximum data rate transfer capability per data channel. The process enables a film with a thickness exceeding 40 \u03bcm to be formed without involving bubble formation. The cloth tapes, on which the female and male snaps are formed and fastened, are not provided with holes for mounting the snaps.