Dual rail network for a remote switching unit
First Claim
1. In a remote switching arrangement, a remote switching unit is connected between subscribers and other switching systems via a plurality of interface equipment, said remote switching unit comprising:
- first and second PCM buses connected to said subscribers and to said other switching systems via said interface equipment for transmitting a plurality of PCM data samples;
first and second originating time switching means, each of said originating time switching means being operated to switch said PCM samples from said interface equipment, said first and second originating time switching means being connected to said interface equipment via said first and second buses respectively;
each of said originating time switching means including;
first and second memory means connected to each of said first and second PCM buses, said first and said second memory means being interconnected so that said first and said second memory means are written into simultaneously corresponding time slots with said transmitted PCM samples;
said first and said second memory means further being capable of being operated so that said PCM samples transmitted on said first bus may be switched from said second bus for subsequent retransmission or alternatively said PCM samples transmitted on said second bus may be switched to said first bus for subsequent retransmission;
said remote switching unit further comprising;
first and second space switching means, said first and second space switching means each including;
first latching means connected to said corresponding first and second originating time switching means, said first latching means operated in response to said subsequently transmitted PCM samples to store said PCM sample during each time slot;
first multiplexing means connected to said first latching means and operated to transmit said stored PCM samples during each time slot in response to first and second operating signals of first predefined values; and
second latching means connected to said multiplexing means and being operated to store said PCM samples transmitted through said multiplexing means during each time slot;
said remote switching unit further comprising;
first and second terminating time switching means being connected respectively between said first and said second space switching means and said interface equipment, said first and second terminating time switching means respectively operated to switch said PCM samples from said first and second space switching means to said interface equipment for transmission to telephone subscribers;
each of said terminating time switching means including;
first and second memory means connected between said second latching means and said interface equipment, said first and said second memory means being interconnected so that said first and said second memory means are written into simultaneously in corresponding time slots for storing said PCM samples stored in said second latching means;
said first and said second memory means further being capable of being operated to switch said PCM samples from said first space switching means through said second terminating time switching means to said telephone subscribers or alternatively being capable of being operated to switch said PCM samples from said second space switching means through said first terminating time switching means to said telephone subscribers.
2 Assignments
0 Petitions
Accused Products
Abstract
A time-space-time switching network (for local to local traffic), a time-space or a space-time switching network portion (for local to remote traffic) is shown for a small remotely located switching system. There are multiple crossovers of PCM data from one information rail to another information rail in this switching system. These two information rails provide for crossover in both the originating and terminating time switching stages for local calls and in only the originating or terminating time switching stages for calls originating or terminating at remotely located switching systems. The information rails remain segregated through the space switching stage of this switching system. The small remotely located switching system is connected to a large host digital switching system via digital spans.
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Citations
31 Claims
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1. In a remote switching arrangement, a remote switching unit is connected between subscribers and other switching systems via a plurality of interface equipment, said remote switching unit comprising:
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first and second PCM buses connected to said subscribers and to said other switching systems via said interface equipment for transmitting a plurality of PCM data samples; first and second originating time switching means, each of said originating time switching means being operated to switch said PCM samples from said interface equipment, said first and second originating time switching means being connected to said interface equipment via said first and second buses respectively; each of said originating time switching means including; first and second memory means connected to each of said first and second PCM buses, said first and said second memory means being interconnected so that said first and said second memory means are written into simultaneously corresponding time slots with said transmitted PCM samples; said first and said second memory means further being capable of being operated so that said PCM samples transmitted on said first bus may be switched from said second bus for subsequent retransmission or alternatively said PCM samples transmitted on said second bus may be switched to said first bus for subsequent retransmission; said remote switching unit further comprising; first and second space switching means, said first and second space switching means each including; first latching means connected to said corresponding first and second originating time switching means, said first latching means operated in response to said subsequently transmitted PCM samples to store said PCM sample during each time slot; first multiplexing means connected to said first latching means and operated to transmit said stored PCM samples during each time slot in response to first and second operating signals of first predefined values; and second latching means connected to said multiplexing means and being operated to store said PCM samples transmitted through said multiplexing means during each time slot; said remote switching unit further comprising; first and second terminating time switching means being connected respectively between said first and said second space switching means and said interface equipment, said first and second terminating time switching means respectively operated to switch said PCM samples from said first and second space switching means to said interface equipment for transmission to telephone subscribers; each of said terminating time switching means including; first and second memory means connected between said second latching means and said interface equipment, said first and said second memory means being interconnected so that said first and said second memory means are written into simultaneously in corresponding time slots for storing said PCM samples stored in said second latching means; said first and said second memory means further being capable of being operated to switch said PCM samples from said first space switching means through said second terminating time switching means to said telephone subscribers or alternatively being capable of being operated to switch said PCM samples from said second space switching means through said first terminating time switching means to said telephone subscribers. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31)
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Specification