H - Electricity – 04 – L
Patent
H - Electricity
04
L
344/1, 340/74
H04L 1/00 (2006.01) H04Q 11/04 (2006.01)
Patent
CA 1194572
ABSTRACT OF THE DISCLOSURE An apparatus is provided in a digital communication system for connecting digital terminals to a terminal junction point, which in turn is in communication with a digital exchange. The terminal junction point contains directing means for sending, in a first state, a flag signal both to all terminals and to the exchange and sending, in a second state, a data packet received from a terminal both to the exchange and to all terminals. The ter- minals have means for sending a data packet in response to reception a given number of times of the flag signal, the reception of said packet at the junction point resetting the directing means to its second state. The terminal also contains comparison means for determining whether the packet data sent back from the junction point corresponds to the terminal's own sent-out packet data, and for disconnecting the terminal in the absence of such correspondence.
427282
Marks & Clerk
Telefonaktiebolaget Lm Ericsson
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