U.S. Philips Corporation

Rolf Stecher

Ulrich R Killat

Dieter A Riekmann

Method the transmission of data packets in a TDM transmission loop wherein the frame is subdivided into several groups each having the same number of words, and each group comprises either exclusively narrow-band channels for the transmission of speech data or is associated with the high-rate channel for groups comprising narrow-band channels always comprises an unambiguous bit sample of, for example, the highest priority is assigned to each group. When a subscriber station wants access to a word group in the high-rate channel it transmits its own identifying bit sample and possibly priority data in a signaling word. When this bit sample is returned through the loop undisturbed the subscriber station immediately accesses the assigned group of words in the high-rate channel for the transmission of a data packet. Allocation of channel access among individual subscriber stations is prioritized. The bit samples identifying groups comprising narrow-band channels receive the highest priority, so that these channels are automatically protected from access as a high-rate channel. A central control unit can increase the number of narrow-band channels by transmitting a further group of identifying bit samples in the signaling word.

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Hamburg, Germany

Rolf Stecher