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Transmission equipment with an optical transmission line

  • US 5,319,486 A
  • Filed: 07/24/1991
  • Issued: 06/07/1994
  • Est. Priority Date: 12/12/1989
  • Status: Expired due to Term
First Claim
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1. In transmission equipment with an optical transmission line to which a plurality of subscriber nodes are connected in series and a clock and packet generation unit which determines at least one rigid bit clock and packets for the transmission line, the packets each including a header and infopart, the header having a target addresses, each of the plurality of subscriber nodes having an assigned address, at least one transmitter for continuously transmitting packets on the transmission line, a synchronization unit which is adjusted to the bit clock so as to be in correct phase, an address detection unit, and a receiver for receiving information contained in the infopart of the packet, the improvement comprising that the transmission line is constructed so as to be purely optical without electronic regenerators interrupting the line, and in that an access unit and a control unit are provided in each of the plurality of subscriber nodes, the control unit comprises the address detection unit and is connected to the access unit and the receiver in such a way that the access unit is incorporated in the transmission line and can be switched into at least a first (a) and a second switching position (b), wherein the light power (ia) which can be branched off from the transmission line in the first switching position (a) is less than the light power (in) which can be branched off in the second switching position, and wherein the light power (ia) branched off in the first switching position (a) is fed at least to the address detection unit and the light power (in) branched off in the second switching position (b) is fed to the receiver.

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