Telephone service system in a asynchronous transfer mode private network
First Claim
1. A telephone service system for use in an asynchronous transfer mode (ATM) private network comprising:
- a public switched telephone network (PSTN) interface unit for performing pulse code modulation (PCM) with an analog telephone signal transmitted from a channel in a PSTN and converting the modulated data into a Conference of European Postal And Telecommunications Administrations (CEPT) frame before sending it to a subscriber, said PSTN interface unit performing the PCM with CEPT frame data received from a subscriber and converting the modulated data into an analog telephone signal before forwarding it to the PSTN;
a first ATM cell processing unit for converting the CEPT frame data from the PSTN interface unit into an ATM cell and converting an ATM cell received from a subscriber into CEPT frame data before transmitting it to the PSTN interface unit;
an ATM switching unit for switching the ATM cell received from the first ATM processing unit to the subscriber and switching the ATM cell received from the subscriber to the PSTN;
a second ATM processing unit for converting the ATM cell received from the ATM switching unit into CEPT frame data before sending it to the subscriber, said second ATM processing unit converting the CEPT frame data received from the subscriber into an ATM cell before sending it to the ATM switching unit; and
a subscriber line interface unit for converting the CEPT frame data received from the second ATM processing unit, into an analog telephone signal before sending it to a relevant subscriber, said subscriber line interface unit performing the PCM with the analog telephone signal received from the subscriber and converting the PCM data into CEPT frame data;
said PSTN interface unit comprising a first tip/ring interface unit for performing the PCM with analog telephone signals of n channels transmitted from the PSTN switch before sending it to a subscriber, said first tip/ring interface unit converting PCM data received from a subscriber, into an analog telephone signal and first CEPT processing unit for converting the PCM data of 30 channels transmitted from the first tip/ring interface unit into one CEPT frame before outputting said PCM data through n/30 E1 channels, said CEPT processing unit receiving a CEPT frame through n/30 E1 channels and converting said CEPT frame into PCM data before transmitting it to said first tip/ring interface unit.
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Accused Products
Abstract
A telephone service system in an ATM private network, includes: a PSTN interface unit for performing PCM with an analog telephone signal transmitted from a channel in a PSTN, converting the modulated data into a CEPT frame before sending it to a subscriber, performing the PCM with CEPT frame data, from a subscriber, and converting the modulated data into an analog telephone signal, before forwarding it to the PSTN; a first ATM cell processing unit for converting the CEPT frame data from the PSTN interface unit into an ATM cell, converting an ATM cell from a subscriber into CEPT frame data, and sending it to the PSTN interface unit; an ATM switching unit for switching the ATM cell from the first ATM processing unit to the subscriber, and switching the ATM cell from the subscriber to the PSTN; a second ATM processing unit for converting the ATM cell from the ATM switching unit into CEPT frame data before sending it to the subscriber, and converting the CEPT frame data from the subscriber into an ATM cell before sending it to the ATM switching unit; and a subscriber line interface unit for converting the CEPT frame data from the second ATM processing unit into an analog telephone signal before sending it to a relevant subscriber, performing the PCM with the analog telephone signal from the subscriber, and converting the PCM data into CEPT frame data.
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Citations
7 Claims
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1. A telephone service system for use in an asynchronous transfer mode (ATM) private network comprising:
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a public switched telephone network (PSTN) interface unit for performing pulse code modulation (PCM) with an analog telephone signal transmitted from a channel in a PSTN and converting the modulated data into a Conference of European Postal And Telecommunications Administrations (CEPT) frame before sending it to a subscriber, said PSTN interface unit performing the PCM with CEPT frame data received from a subscriber and converting the modulated data into an analog telephone signal before forwarding it to the PSTN; a first ATM cell processing unit for converting the CEPT frame data from the PSTN interface unit into an ATM cell and converting an ATM cell received from a subscriber into CEPT frame data before transmitting it to the PSTN interface unit; an ATM switching unit for switching the ATM cell received from the first ATM processing unit to the subscriber and switching the ATM cell received from the subscriber to the PSTN; a second ATM processing unit for converting the ATM cell received from the ATM switching unit into CEPT frame data before sending it to the subscriber, said second ATM processing unit converting the CEPT frame data received from the subscriber into an ATM cell before sending it to the ATM switching unit; and a subscriber line interface unit for converting the CEPT frame data received from the second ATM processing unit, into an analog telephone signal before sending it to a relevant subscriber, said subscriber line interface unit performing the PCM with the analog telephone signal received from the subscriber and converting the PCM data into CEPT frame data; said PSTN interface unit comprising a first tip/ring interface unit for performing the PCM with analog telephone signals of n channels transmitted from the PSTN switch before sending it to a subscriber, said first tip/ring interface unit converting PCM data received from a subscriber, into an analog telephone signal and first CEPT processing unit for converting the PCM data of 30 channels transmitted from the first tip/ring interface unit into one CEPT frame before outputting said PCM data through n/30 E1 channels, said CEPT processing unit receiving a CEPT frame through n/30 E1 channels and converting said CEPT frame into PCM data before transmitting it to said first tip/ring interface unit. - View Dependent Claims (3, 4, 6)
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2. A telephone service system for use in an asynchronous transfer mode (ATM) private network, comprising:
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a public switched telephone network (PSTN) interface unit for performing pulse code modulation (PCM) with an analog telephone signal transmitted from a channel in a PSTN and converting the modulated data into a Conference of European Postal And Telecommunications Administrations (CEPT) frame before sending it to a subscriber, said PSTN interface unit performing the PCM with CEPT frame data received from a subscriber and converting the modulated data into an analog telephone signal before forwarding it to the PSTN; a first ATM cell processing unit for converting the CEPT frame data from the PSTN interface unit into an ATM cell and converting an ATM cell received from a subscriber into CEPT frame data before transmitting it to the PSTN interface unit; an ATM switching unit for switching the ATM cell received from the first ATM processing unit to the subscriber and switching the ATM cell received from the subscriber to the PSTN; a second ATM processing unit for converting the ATM cell received from the ATM switching unit into CEPT frame data before sending it to the subscriber, said second ATM processing unit converting the CEPT frame data received from the subscriber into an ATM cell before sending it to the ATM switching unit; and a subscriber line interface unit for converting the CEPT frame data received from the second ATM processing unit, into an analog telephone signal before sending it to a relevant subscriber, said subscriber line interface unit performing the PCM with the analog telephone signal received from the subscriber and converting the PCM data into CEPT frame data; said subscriber interface unit comprising a second tip/ring interface unit for performing the PCM with analog telephone signals of multiple channels transmitted from subscribers and converting PCM data from the PSTN into analog telephone signals before sending it to a relevant subscriber, and a second CEPT processing unit for converting the PCM data of 30 channels from said second tip/ring interface unit into one CEPT frame before outputting it through n/30 E1 channels, and converting a CEPT frame received from subscribers into PCM data of 30 channels. - View Dependent Claims (5)
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7. A telephone service system in an asynchronous transfer mode (ATM) private network, comprising:
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a first tip/ring interface unit for performing Pulse Code Modulation (PCM) with analog telephone signals of n channels transmitted from a Public Switched Telephone Network (PSTN) switch before sending them to a subscriber, and converting PCM data received from a subscriber into an analog telephone signal; a first CEPT processing unit for converting the PCM data of 30 channels transmitted from the first tip/ring interface unit, into one CEPT frame before outputting it through n/30 E1 channels, said CEPT processing unit receiving a CEPT frame through n/30 channels and converting said CEPT frame into PCM data before transmitting it to said first tip/ring interface unit; a first cell assembly/disassembly processing unit for converting the CEPT frame signal received from the first CEPT processing unit into an ATM cell and converting the ATM cell received from the ATM switching unit into a CEPT frame before sending it to the first CEPT processing unit; a first physical hierarchy processing unit for transmitting the ATM cell received from the first cell assembly/disassembly processing unit into an ATM switching unit, and for transmitting the ATM cell received from the ATM switching unit to the first cell assembly/disassembly processing unit; an ATM switching unit for receiving an ATM cell from a first ATM cell processing unit, selecting a path with reference to a virtual path identifier and a virtual channel identifier contained in a cell header, before sending the cell to a subscriber, and sending an ATM cell transmitted from a subscriber to a PSTN; a second cell assembly/disassembly processing unit for converting an ATM cell received from the ATM switching unit into a CEPT frame before sending it to a subscriber, and for converting a CEPT frame signal from the subscriber into an ATM cell before sending it to the ATM switching unit; a second physical hierarchy processing unit for transmitting the ATM cell from the second cell assembly/disassembly processing unit to the ATM switching unit, said second physical hierarchy processing unit receiving an ATM cell from the ATM switching unit and transmitting it to the second cell assembly/disassembly processing unit; a second tip/ring interface unit for performing the PCM with analog telephone signals of multiple channels transmitted from subscribers, and for converting PCM data received from the PSTN into analog telephone signals before sending it to a relevant subscriber; and a second CEPT processing unit for converting the PCM data of 30 channels received from second tip/ring interface unit into one CEPT frame before outputting the frame through n/30 E1 channels, and for converting a CEPT frame received from subscribers into PCM data of 30 channels.
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Specification