| 摘要 |
A REGENERATIVE NODE FOR A RING NETWORK A regenerative node for use with scrambled, time domain multiplexed (TDM) data channels has a delay-lock receiver (6) for locking onto a channel scrambled by its associated scramble sequence or a common scramble sequence; a transmitter (4) slaved to the receiver (6) for providing data to be transmitted by the node which has been scrambled by the another node's scramble sequence or an empty channel signal scrambled by the common scramble sequence in phase synchronism with the TDM channel to which the receiver is locked; and a regenerator (8) for regenerating the received TDM channels or the TDM channels with the transmitted data overwriting the delay-locked channel. A node wishing to set up a call searches and delay-locks to a channel having a channel empty sequence scrambled by the common sequence and once delay-locked to it transmits a signal scrambled by the destination nodes sequence. The other node will subsequently delay-lock to this channel and transmit to the first node in the same TDM channel using the scramble sequence of the first node. The invention finds particular application in ring networks for 2-way video communications. |
