Switching system for digital transmission network
AssigneeSat
InventorsClaude J. Force, Claude C. Loisel
Life of this patent
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Abstract
A switching system is provided for application to a multichannel digital transmission network. It allows a defective channel to be replaced by an emergency channel without the user of the channel being aware of the replacement. On the emission side as well as on the reception side, switching and processing take place of bipolar signals, for example a High Density Bipolar 3 code, which allows the path doubled or extended so as to increase the operating safety of the network and provide greater flexibility in use.
Claims12
In a switching system for a digital transmission network having at least one normal channel, comprising, on the transmission side, means for applying to the input of an emergency channel a signal applied to the input of the normal channel and, on the reception side, means sensitive to the time shift between the signal of the normal channel and the signal of the emergency channel adapted for controlling means for compensating said shift and means for switching from the normal channel to the emergency channel when said shift is compensated for, said signal application means on the transmission side are adapted for transmitting bipolar signals and further said sensitive means and said compensation means, on the reception side, are adapted for receiving bipolar signals.
Switching system for a digital transmission network having at least one normal channel and an emergency channel, between a transmission side and a reception side, comprising:
- on the transmission side, at least one transmission junction, for applying to the input of said emergency channel a bipolar signal applied to the input of said normal channel;
- on the reception side, means for compensating the time shift between the bipolar signal of said normal channel and the bioplar signal of said emergency channel;
- and
- on the reception side, a reception circuit comprising means sensitive to said time shift and means for switching from the normal channel to the emergency channel, said time shift sensitive means being adapted for controlling said time shift compensation means until said time shift is compensated for, and then for controlling said switching means, said time shift sensitive means and said time shift compensation means being adapted for receiving bipolar signals.
A switching system for a bipolar digital transmission network utilizing a transmission side and a reception side, each side having at least one normal channel and an emergency channel, said switching system comprising:
- at least one transmission junction means, on said transmission side, for applying, in response to a switching order signal, a bipolar signal to the input of said normal channel and to the input of said emergency channel;
- means, on the reception side and responsive to bipolar signals from said normal and emergency channels, for compensating, in response to said switching order signal, for any time shift between a bipolar signal received from said normal channel and a bipolar signal received from said emergency channel;
- and
- a reception circuit, on the reception side, comprising means for switching from the normal channel to the emergency channel, and correlation circuit means for controlling said time shift compensating means until any time shift is compensated for.
Dependencies are inferred from the claim text.