H - Electricity – 04 – L
Patent
H - Electricity
04
L
340/84
H04L 9/00 (2006.01) G06F 13/368 (2006.01) H04L 12/433 (2006.01)
Patent
CA 1172332
ABSTRACT OF THE DISCLOSURE The invention relates to a method and an arrangment for giving send authorization to any of the terminals in a telecom- munication network, which are connected to each other through a common ring bus, controlled by a computer located at each of the terminals. On the ring bus a signal work frame of HDLC format circulates. The frame which is sent from any of the terminals, comprises a send authorization word in the form of a specific signal pattern. When one or more of the terminals con- nected to the bus is in a determined logic condition, that ter- minal receives the send authorization which is first to exhibit the logic condition in relation to the position of the send author- ization frame on the loop. As soon as one of the terminals has received the send authorization it transmits an abort pattern within the frame to the bus. The frame then becomes invalid and no other terminal can accept the send authorization. When a ter- minal has completed its data transmission it retransmits the send authorization frame to the bus so that send authorization again is available to all the terminals. When a terminal has nothing to send the terminal is aborted, and the circulating send permission is looped through the terminal back to the ring bus. An address comparison logic circuit receives all the frames on a first input and compares the address field in the received frames with a fixed address corresponding to the pattern of said send authorization and generates upon equal addresses a control signal either to a first abort generator or a second abort gen- erator depending on the logic signal state of a second input. The first abort generator transmits, when activated, an abort word within the frame to the bus. The second abort generator transmits, when activated, an abortion signal word within the frame towards the terminal. A flag detection circuit detects the incoming data flow and transmits, for each received, complete flag signal pattern, a control signal to the address comparison circuit to start said comparison.
402284
Bladh Anders
Lindholm Ake
Marks & Clerk
Telefonaktiebolaget Lm Ericsson
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