초록 ▼

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 channe

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.

대표청구항 ▼

A method for controlling subscriber station access to a time-division multiplex message transmission path in which a common central control and a plurality of subscriber stations are connected in a recirculatory circuit and in which the central control produces cyclically recurring frames of a prede

A method for controlling subscriber station access to a time-division multiplex message transmission path in which a common central control and a plurality of subscriber stations are connected in a recirculatory circuit and in which the central control produces cyclically recurring frames of a predetermined number of channels defined by a corresponding number of binary words each having a predetermined number of bits; at least one such word being assigned as a signaling word in each frame, a variable contiguous portion of the said number of words being allocated as narrow-band channels through each of which a word may be transmitted in each frame and a further variable contiguous portion of the said number of words being reserved to form a high-rate channel through which data packets may be transmitted in sequences of consecutive words; such method comprising the steps of: dividing each frame into several groups of words, and assigning particular words as signaling words which identify each of such groups; causing the central control to continuously transmit a predetermined first bit sample comprising a specified number of bits in the signalling words of the groups to which narrow band channels are assigned; prior to transmission by a subscriber station of a data packet in the high-rate channel, causing such subscriber station to transmit, in a signaling word which does not contain said first bit sample, a bit sample comprising a specified number of bits and which is individually assigned to such subscriber station; and upon subsequent return through said recirculatory loop to such subscriber station of said assigned bit sample, unaltered, in the the signaling word in which it was transmitted, causing such subscriber station to transmit said data packet in the group of words identified by such signaling word.