Frame relay protocol-based multiplex switching scheme for satellite mesh network

• US 6,381,227 B1
• Filed: 01/21/1997
• Issued: 04/30/2002
• Est. Priority Date: 06/17/1993
• Status: Expired due to Term

• Current Assignee: Gilat Satellite Networks Limited
• Original Assignee: Gilat Florida, Inc.
• Inventors: Gross, Todd W., Fielding, Dennis E.
• Primary Examiner(s): MARCELO, MELVIN C
• Application Number:
  US08/786,234
• Time in Patent Office: 1,925 Days
• Field of Search: 370/229, 370/327, 370/328, 370/345, 370/349, 370/321, 370/336
• US Class Current: 370/321
• CPC Class Codes: H04B 7/18582 Arrangements for data linking, i.e. for data framing, for error recovery, for multiple access

Abstract

A frame relay protocol-based earth station interface architecture provides full mesh connectivity for a relatively small number of network stations. The fundamental component of the architecture is a frame relay protocol-based switch, which employs a network interface ‘frame relay’ standard to define the multiplexing of multiple virtual ports across single physical communications port. Through address and control fields of its connectivity control software, the frame relay protocol-based switch can be dynamically configured to provide multilayer addressing and device selectivity, thereby enabling point-to-point connectivity of multiple terminal devices, such as a plurality of audio circuits, to be effected via a single port. Dial codes on the station side of an audio signal multiplexer link are translated into frame relay addresses (data link connection identifiers) that are added to each frame of data for routing through the network. With this additional layer of routing information, audio (voice) connectivity is now available between any two audio circuits (e.g. trunks) in the network.

Claims

1. For use in a satellite communication network providing full mesh connectivity through a communication satellite, among terminal devices that are coupled to associated earth stations of a multi-earth station network that is comprised of at least three earth stations, a respective earth station apparatus comprising:

a transceiver unit which is operative to transmit, via an up-link communication channel associated with said respective earth station to said communication satellite, messages which are broadcast by said communication satellite over plural downlink communication channels to plural others of said at least three earth stations of said network, and which is operative to receive, via plural downlink communication channels from said communication satellite, messages which have been transmitted uplink to said satellite over a plurality of other up-link channels respectively associated with plural others of said at least three earth stations, and which are broadcast by said communication satellite over said plural downlink communication channels to the earth stations of said network;

a modulator/demodulator unit, which is coupled with said transceiver unit and is operative to modulate uplink-directed messages, supplied by one or more terminal devices that are coupled to said earth station, in accordance with a prescribed modulation format for transmission by said transceiver unit over said uplink channel, and to demodulate downlink-directed messages which have been broadcast by said communication satellite over said plural downlink communication channels to the earth stations of said network, and which are received by said transceiver unit from said communication satellite and destined for one or more terminal devices that are coupled to said earth station; and

a frame relay protocol-based switch, having a plurality of communication link-associated ports coupled to communication links for receiving therefrom messages whose contents are representative of frame relay protocol-based routing information supplied from terminal devices served by said respective earth station, and for delivering, to terminal devices served by said respective earth station, downlink-directed messages which have been broadcast by said communication satellite over said plural downlink communication channels to the earth stations of said network, and received by said transceiver unit from said communication satellite and destined for one or more terminal devices that are coupled to said respective earth station, and a plurality of uplink/downlink ports, coupled to said modulator/demodulator unit, said frame relay protocol-based switch being operative to controllably connect a selected one of said communication link-associated ports to a selected one of said uplink/downlink ports, and thereby connect uplink-directed message signals from any terminal device to an uplink port of said plurality of uplink/downlink ports, for modulation by said modulator/demodulator unit connected thereto in accordance with said prescribed modulation format for transmission by said transceiver unit over said uplink channel, and to controllably route downlink-directed message signals, that have been broadcast by said communication satellite over said plural downlink communication channels and received by said transceiver unit, demodulated by said modulator/demodulator unit and coupled to downlink ports of said plurality of uplink/downlink ports, to any selected one of said communication link-associated ports, in accordance with routing information contained in said downlink-directed messages of said plural downlink communication channels from other earth stations of said network.

2. An earth station apparatus for use in a satellite communication network according to claim 1, wherein said communication channels comprise time division multiple access communication channels.

3. An earth station apparatus for use in a satellite communication network according to claim 1, wherein said communication channels comprise single channel per carrier communication channels.

4. An earth station apparatus for use in a satellite communication network according to claim 1, one of said plurality of communication link-associated ports is coupled to a terminal device multiplexer which is operative to controllably interface signals between a plurality of virtual ports to which plural terminal devices served by said respective earth station are coupled and said one of said plurality of communication link-associated ports.

5. An earth station apparatus for use in a satellite communication network according to claim 1, wherein one of said plurality of communication link-associated ports is coupled to an audio signalling circuit multiplexer which is operative to controllably interface audio message signals between a plurality of virtual ports to which audio circuit devices served by said respective earth station are coupled and said one of said plurality of communication link-associated ports.

6. An earth station apparatus for use in a satellite communication network according to claim 3, wherein said modulator/demodulator unit contains a plurality of downlink demodulators which are operative to demodulate downlink-directed messages that have been broadcast by said communication satellite over plural downlink communication channels at a plurality of respectively different frequencies, and only a single uplink modulator which is operative to modulate uplink-directed messages, supplied by one or more terminal devices coupled to said respective earth station, in accordance with said prescribed modulation format for transmission by said transceiver unit over an uplink channel frequency different from said plurality of respectively different frequencies.

7. An earth station apparatus for use in a satellite communication network according to claim 1, wherein said terminal devices include respective audio, data and video signalling devices.

8. An earth station apparatus for use in a satellite communication network according to claim 1, wherein said frame relay protocol-based switch is operative to route message signals therethrough in accordance with a plurality of queuing levels respectively associated with different types of messages signals.

9. An earth station apparatus for use in a satellite communication network according to claim 8, wherein said terminal devices include respective audio, data and video signalling devices and wherein said frame relay protocol-based switch is operative to route message signals therethrough such that audio frames are given highest priority, video teleconferencing frames are given the next highest priority, and data frames are given lowest priority.

10. An earth station apparatus for use in a satellite communication network according to claim 8, wherein port configuration parameters of said frame relay protocol-based switch define a frame routing control code which is operative to selectively discard or pass frames based upon a prescribed portion of a frame relay address.

11. An earth station apparatus for use in a satellite communication network according to claim 10, wherein said port configuration parameters of said frame relay protocol-based switch which define said frame routing control code are based upon contents of a first byte of the frame relay address.

12. An earth station apparatus for use in a satellite communication network according to claim 8, wherein a frame associated with a prescribed frame address processed by said frame relay-based protocol switch contains a frame relay header that includes a discard eligibility code which causes said respective frame to be initially discarded in an attempt to alleviate a congestion condition.

13. For use in a satellite communication network providing full mesh connectivity through a communication satellite, among terminal devices that are coupled to associated earth stations of a multi-earth station network that is comprised of at least three earth stations, a method of providing full mesh connectivity between any two terminal devices of said network comprising the steps of:

(a) providing, at a respective earth station,

a transceiver unit which is operative to transmit, via an up-link communication channel associated with said respective earth station to said communication satellite, messages which are broadcast by said communication satellite over plural downlink communication channels to plural others of said at least three earth stations of said network, and which is operative to receive, via plural downlink communication channels from said communication satellite, messages which have been transmitted up-link to said satellite over a plurality of other up-link channels respectively associated with plural others of said at least three earth stations, and which are broadcast by said communication satellite over said plural downlink communication channels to the earth stations of said network,

a modulator/demodulator unit, which is coupled with said transceiver unit and is operative to modulate uplink-directed messages, supplied by one or more terminal devices that are coupled to said earth station, in accordance with a prescribed modulation format for transmission by said transceiver unit over said uplink channel, and to demodulate downlink-directed messages which have been broadcast by said communication satellite over said plural downlink communication channels to the earth stations of said network, and which are received by said transceiver unit from said communication satellite and destined for one or more terminal devices that are coupled to said earth station, and

a frame relay protocol-based switch, having a plurality of communication link-associated ports coupled to communication links for receiving therefrom messages whose contents are representative of frame relay protocol-based routing information supplied from terminal devices served by said respective earth station, and for delivering, to terminal devices served by said respective earth station, downlink-directed messages which have been broadcast by said communication satellite over said plural downlink communication channels to the earth stations of said network, and received by said transceiver unit from said communication satellite and destined for one or more terminal devices that are coupled to said respective earth station, and a plurality of uplink/downlink ports, coupled to said modulator/demodulator unit, said frame relay protocol-based switch being operative to controllably connect a selected one of said communication link-associated ports to a selected one of said uplink/downlink ports, and thereby connect uplink-directed message signals from any terminal device to an uplink port of said plurality of uplink/downlink ports, for modulation by said modulator/demodulator unit connected thereto in accordance with said prescribed modulation format for transmission by said transceiver unit over said uplink channel, and to controllably route downlink-directed message signals, that have been broadcast by said communication satellite over said plural downlink communication channels and received by said transceiver unit, demodulated by said modulator/demodulator unit and coupled to downlink ports of said plurality of uplink/downlink ports, to any selected one of said communication link-associated ports, in dependence upon routing information contained in said downlink-directed messages of said plural downlink communication channels from other earth stations of said network,

(b) at a first earth station, coupling a message that has been sourced from a calling terminal device and contains frame relay protocol-based routing information, over a communication link to a communication link-associated port of the frame relay protocol-based switch of said first earth station, and causing the frame relay protocol-based switch of said first earth station to connect said communication link-associated port to an uplink port of said uplink/downlink communications ports, and thereby connect uplink-directed message signals from said calling terminal device to said uplink port of said plurality of uplink/downlink ports for transmission via said up-link communication channel associated with said first earth station to said communication satellite; and

(c) at a second earth station, terminating messages to destination terminal devices by causing the frame relay protocol-based switch of said second earth station to controllably route downlink-directed message signals of said plural downlink communication channels associated with said other earth stations of said network, and which are coupled to downlink ports of said plurality of uplink/downlink ports, to selected communication link-associated ports of said frame relay protocol-based switch, to which communication links serving said destination terminal devices are coupled, in accordance with routing information contained in downlink-directed messages received over any of said plural downlink communication channels.

14. A method according to claim 13, wherein said communication channels comprise time division multiple access communication channels.

15. A method according to claim 13, wherein said communication channels comprise single channel per carrier communication channels.

16. A method according to claim 13, one of said plurality of communication link-associated ports is coupled to a terminal device multiplexer which is operative to controllably interface signals between a plurality of virtual ports to which plural terminal devices served by said respective earth station are coupled and said one of said plurality of communication link-associated ports.

17. A method according to claim 13, wherein one of said plurality of communication link-associated ports is coupled to an audio signalling circuit multiplexer which is operative to controllably interface audio message signals between a plurality of virtual ports to which audio circuit devices served by said respective earth station are coupled and said one of said plurality of communication link-associated ports.

18. A method according to claim 15, wherein said modulator/demodulator unit contains a plurality of downlink demodulators which are operative to demodulate downlink-directed messages that have been broadcast by said communication satellite over plural downlink communication channels at a plurality of respectively different frequencies, and only a single uplink modulator which is operative to modulate uplink-directed messages, supplied by one or more terminal devices coupled to said respective earth station, in accordance with said prescribed modulation format for transmission by said transceiver unit over an uplink channel frequency different from said plurality of respectively different frequencies.

19. A method according to claim 13, wherein said terminal devices include respective audio, data and video signalling devices.

20. A method according to claim 13, wherein said frame relay protocol-based switch is operative to route message signals therethrough in accordance with a plurality of queuing levels respectively associated with different types of messages signals.

21. A method according to claim 20, wherein said terminal devices include respective audio, data and video signalling devices and wherein said frame relay protocol-based switch is operative to route message signals therethrough such that audio frames are given highest priority, video teleconferencing frames are given the next highest priority, and data frames are given lowest priority.

22. A method according to claim 20, wherein port configuration parameters of said frame relay protocol-based switch define a frame routing control code which is operative to selectively discard or pass frames based upon a prescribed portion of a frame relay address.

23. A method according to claim 22, wherein said port configuration parameters of said frame relay protocol-based switch which define said frame routing control code are based upon contents of a first byte of the frame relay address.

24. A method according to claim 20, wherein a frame associated with a prescribed frame address processed by said frame relay-based protocol switch contains a frame relay header that includes a discard eligibility code which causes said respective frame to be initially discarded in an attempt to alleviate a congestion condition.

25. A system comprising:

a satellite; and

first, second, and third earth stations interconnected via a single hop through the satellite, wherein the first earth station for sending data packets to the second and third earth stations, the second earth station for sending data packets to the first and third earth stations, and the third earth station for sending data packets to the first and second earth stations, each earth station including;

a satellite antenna for communicating with the satellite,

a transceiver coupled to the antenna for sending and receiving signals to and from the satellite antenna,

a modem coupled to the transceiver for modulating and demodulating signals sent to or received from the transceiver,

a plurality of terminal devices including at least two voice circuits each generating a dial code,

a switch, coupling a plurality of terminal devices with the modem, and for inputting data from the plurality of terminal devices, assembling the data into frame relay based data packets having a frame boundary flag, an address field responsive to one of the dial codes, a data field, and a frame check sequence, for discarding down link directed data packets destined for terminal devices associated with other switches and for routing down link directed data packets destined for terminal devices associated with the switch based on the contents of the down-link directed data packets.

26. The system of claim 25 wherein each switch is a frame-relay protocol based switch.

27. The system of claim 26 wherein the data packets are arranged according to a frame relay standard.

28. The system of claim 27 wherein the data packets are configured according to CCITT frame relay standards.

29. The system of claim 25 wherein each earth station includes a plurality of terminal devices including at least two voice circuits each generating a dial code.

30. The system of claim 29 including a voice multiplexer unit disposed between the two voice circuits and the switch.

31. The system of claim 30 wherein the output of the voice multiplexer unit is packetized data.

32. The system of claim 31 wherein the voice multiplexer unit outputs data packets assembled based on frame relay standards.

33. The system of claim 25 wherein the switch includes connectivity control software for dynamically configuring the switch to provide multilayer addressing and filtering.

34. The system of claim 25 wherein the modem includes a single modulator and a plurality of demodulators.

35. The system of claim 25 wherein the transceiver uses a time division multiple access protocol.

36. The system of claim 25 wherein the switch is configured to assemble data packets from data received on one or more data circuits and wherein the data packets assembled from the voice circuits have priority over data packets assembled from the data circuits.

37. A first earth station for use in a system having at least three earth stations interconnected via a single hop through a satellite wherein data from each earth station is broadcast to every other earth station, the first earth station comprising:

a satellite antenna,

a transceiver coupled to the satellite antenna for sending signals to and receiving signals from the satellite antenna,

a modem coupled to the transceiver for modulating and demodulating signals sent to or received from the transceiver, and

a switch capable of supporting frame relay protocols, coupling a plurality of terminal devices to the modem, and for inputting data from the plurality of terminal devices, packetizing the data into data packets having a boundary flag, an address field a data field, and a frame check sequence, and for discarding received data packets which are not directed to the first earth station and for routing data packets which are directed to the first earth station based upon the contents of down-link directed data packets.

38. The system of claim 37 wherein the switch is a frame-relay protocol based switch.

39. The system of claim 37 wherein the data packets are arranged according to a frame relay based standard.

40. The system of claim 39 wherein the data packets are configured according to CCITT frame relay standards.

41. The system of claim 37 wherein the first earth station includes at least two voice circuits, each generating a dial code.

42. The system of claim 41 including a voice multiplexer unit disposed between the two voice circuits and the switch.

43. The system of claim 42 wherein the voice multiplexer unit is configured to output packetized data.

44. The system of claim 43 wherein the voice multiplexer unit is configured for decoding the address field and for coupling data in an associated data field to a particular voice circuit dependent upon the address field in the data packet.

45. The system of claim 44 wherein the switch includes connectivity control software allowing the switch to be dynamically configured to provide multilayer addressing and filtering.

46. The system of claim 37 wherein the modem includes a single modulator and a plurality of demodulators.

47. The system of claim 46 wherein the transceiver is configured to uses a single carrier per channel protocol.

48. The system of claim 37 wherein the transceiver is configured to use a time division multiple access protocol.

49. The system of claim 37 wherein the switch is configured to provide data packets containing data from the voice circuits with priority over at least some packets which do not contain data from the voice circuits.

50. For use in a system having a satellite and at least three earth stations, the method comprising relaying frame relay voice packets having an address code responsive to a dial code and frame relay data packets from the first earth station directly to the second and third earth stations and from the second earth station directly to the first and third earth station and from the third earth station directly to the first and second earth station in a single hop, wherein connectivity is achieved between terminal devices coupled to the first, second, and third earth stations, and wherein the contents of the frame relay packets are utilized to determine the routing and filtering at each earth station.

51. A system comprising first, second, and third earth stations interconnected via a satellite with each earth station for broadcasting frame relay protocol based data packets to the other earth stations, wherein each earth station includes a switch for inputting data from a plurality of terminal devices, for packetizing the data into the frame relay protocol based data packets having an address field, and for filtering and routing data packets received from the satellite based on the contents of an address field of down-link directed data packets.

52. The system of claim 51 wherein the frame relay protocol based data packets are configured according to CCITT frame relay standards.

53. The system of claim 51 wherein each earth station includes a voice multiplexer unit disposed between at least some of the terminal devices and the switch.

54. The system of claim 53 wherein the output of the voice multiplexer unit includes frame relay protocol based data packets.

55. The system of claim 51 wherein the switch includes connectivity control software for dynamically configuring the switch to provide multilayer addressing and filtering.

56. The system of claim 51 wherein the earth stations are configured for using a single carrier per channel protocol.

57. The system of claim 51 wherein the earth stations are configured for using a time division multiple access protocol.

58. The system of claim 51 wherein data packets containing data from voice links have priority over data packets containing data from data links.

59. A first earth station for use in a system having at least two other earth stations interconnected via a satellite wherein data from each earth station is broadcast to the other earth stations, the first earth station comprising a data link, at least two voice circuits each having a dial code, and a switch configured for inputting data from the voice circuits and packetizing the data into data packets having an address field responsive to one of the dial codes, packetizing data from data circuits into data packets, and filtering and routing down-link directed data packets based on the content of the data packets, wherein the switch packetizes the data packets using elementary error detection and is configurable to support frame relay based protocols.

60. The system of claim 59 wherein the switch is a frame-relay protocol based switch.

61. The system of claim 60 wherein the data packets are based on a frame relay standard.

62. The system of claim 61 wherein the data packets are configured according to CCITT frame relay standards.

63. The system of claim 59 including a voice multiplexer unit disposed between the two voice circuits and the switch.

64. The system of claim 63 wherein the voice multiplexer unit is configured for outputting packetized data.

65. The system of claim 64 wherein the voice multiplexer unit decodes the address field and couples data in an associated data field to a particular voice circuit dependent upon the address field in the data packet to thereby form virtual ports in the switch.

66. The system of claim 65 wherein the switch includes connectivity control software for dynamically configuring the switch to provide multilayer addressing and filtering.

67. The system of claim 59 wherein the earth stations are configured to communicate using a single carrier per channel.

68. The system of claim 59 wherein the earth stations are configured to communicate using a time division multiple access protocol.

69. The system of claim 59 wherein the switch is configured to provide data packets containing data from the voice circuits with priority over data packets containing data from the data circuits.

70. A method comprising:

packetizing,data from voice circuits into data packets having an address responsive to a dial code on an associated voice circuit and packetizing data from a data circuit into data packets, the data packets having frame relay based elementary error detection and being assembled at each of three earth stations;

using a single hop satellite network to broadcast the data packets from each earth station directly to each of at least two other earth stations; and

filtering and routing down-link directed data packets at each earth station based upon the contents of the data packets using a switch configured to support frame relay based protocols.

71. The method of claim 70 wherein packetizing data includes packetizing data using a frame-relay protocol based switch.

72. The method of claim 71 wherein packetizing data includes packetizing data based on a frame relay standard.

73. The method of claim 72 wherein packetizing data includes packetizing data in accordance with CCITT frame relay standards.

74. The method of claim 70 wherein packetizing data includes the use of a voice multiplexer to packetize data from the voice circuits.

75. The method of claim 74 including using the voice multiplexer to decode a data packet such that the address is used to direct associated data to a particular voice circuit dependent upon the address to thereby form virtual ports in the switch.

76. The method of claim 75 including using connectivity control software in the switch to dynamically configure the switch to provide multilayer addressing and filtering.

77. The method of claim 70 including communicating between the earth stations using a single carrier per channel protocol.

78. The method of claim 70 including communicating between the earth stations using a time division multiple access protocol.

79. The method of claim 70 including providing priority within the switch for data packets associated with the voice circuits over data packets associated with the data circuit.

80. A method comprising:

sending frame relay protocol based data packets directly from a first earth station to both second and third earth stations;

sending one relay protocol based data packets directly from the second earth station to both the first and third earth stations;

sending fame relay protocol based data packets directly from the third earth station to both the first and second earth stations;

assembling the frame relay protocol based data packets from both voice links and data links and configuring an address field of the packets from the voice links in response to a dial code on an associated voice link; and

filtering and routing data packets received from a satellite based on contents of down link directed data packets.

81. The method of claim 80 wherein filtering includes discarding frames using a frame-relay protocol based switch.

82. The method of claim 80 wherein assembling includes assembling data packets based on a frame relay standard.

83. The method of claim 82 wherein assembling includes assembling data packets in accordance with CCITT frame relay standards.

84. The method of claim 80 wherein assembling includes using a voice multiplexer to assemble frame relay protocol based data packets from data on the voice links.

85. The method of claim 84 including using the voice multiplexer to decode a data packet to direct data associated with the data packet to a particular voice circuit dependent upon the address, thereby forming virtual ports.

86. The method of claim 80 including using connectivity control software to dynamically configure a switch to provide multilayer addressing and filtering.

87. The method of claim 80 including communicating between the earth stations using a single carrier per channel protocol.

88. The method of claim 80 including communicating between the earth stations using a time division multiple access protocol.

89. The method of claim 80 including using a switch to provide priority for data packets associated with voice circuits over data packets associated with data circuits.

90. A method comprising:

receiving at a first earth station data packets from at least two other earth stations via a single hop satellite network;

assembling data packets at the first earth station from data received from voice circuits and data circuits;

configuring an address in the data packets formed from the voice circuits responsive to a dial code on an associated voice circuit;

filtering and routing down-link directed data packets based on the contents of the data packets; and

configuring the data packets with elementary error detection using frame-relay base protocols.

91. The method of claim 90 wherein filtering and routing includes using a frame-relay protocol based switch.

92. The method of claim 90 wherein configuring the data packets includes configuring the data packets based on a frame relay standard.

93. The method of claim 92 wherein configuring the data packets includes configuring the data packets in accordance with CCITT frame relay standards.

94. The method of claim 90 wherein assembling includes the use of a voice multiplexer to assemble data from the voice circuits.

95. The method of claim 94 including using the voice multiplexer to decode a data packet such that the address is used to direct associated data to a particular voice circuit dependent upon the address to form virtual ports.

96. The method of claim 95 including using connectivity control software in the switch to dynamically configure the switch to provide multilayer addressing and filtering.

97. The method of claim 96 including communicating between the earth stations using a single carrier per channel protocol.

98. The method of claim 96 including communicating between the earth stations using a time division multiple access protocol.

99. The method of claim 95 including providing priority within the switch for data packets associated with the voice circuits over data packets associated with the data circuits.

100. In a first earth station, a method comprising:

receiving at a first earth station data packets broadcast from at least two other earth stations via a single hop mesh satellite network;

using a voice multiplexer to assemble frame relay protocol based data packets at the fist earth station from data received from voice circuits;

configuring an address in the data packets formed from the voice circuits responsive to a dial codes on an associated voice circuit;

using a switch to filter and route down link directed data packets based on the contents of data packets; and

sending to a satellite the frame relay protocol based data packets for broadcast to at least two other earth stations via the single hop mesh satellite network.

101. The method of claim 100 wherein the mesh satellite network has less than sixteen earth stations.

102. A first earth station for use in a system having at least two other earth stations interconnected via a single hop through a satellite wherein data from each earth station is broadcast to the other earth stations, the first earth station comprising:

means for receiving and transmitting signals to and from a satellite;

means for inputting the data from voice and data circuits, packetizing the data into data packets having a boundary flag, an address field responsive to a dial code, a data field, and a frame check sequence, and for discarding and routing down link directed data packets based on the contents of the data packets.

103. A system comprising a satellite, and first, second, and third earth stations interconnected via a single hop through the satellite and configured for broadcasting uplink directed data to the other earth stations, each earth station including means for inputting data from a plurality of terminal devices, packetizing the data into frame relay protocol based data packets having an address field responsive to a dial code and for filtering and routing down-link directed data packets based on the contents of the address field of the data packets.

104. A system comprising a satellite and first, second, and third earth stations interconnected via a single hop through the satellite, wherein the first earth station sends data packets to the second and third earth stations, the second earth station sends data packets to the first and third earth station, and the third earth station sends data packets to the first and second earth station, each earth station including at least two voice circuits each generating a dial code, a data circuit, and a switch configured for inputting data from the voice circuits, packetizing the data into data packets having a frame boundary flag, an address field responsive to one of the dial codes, a data field, and a frame check sequence, and discarding frames received from the satellite based on the contents of the down-link directed data packets, wherein the switch is configurable for supporting frame relay based protocols.

105. A method for use in a system having first, second, and third earth stations, the method comprising relaying frame relay data packets from the first earth station directly to the second and third earth stations and from the second earth station directly to the first and third earth station and from the third earth station directly to the first and second earth station, wherein relaying includes forming connectivity between terminal devices coupled to the first, second, and third earth stations, and wherein relaying includes using the contents of the frame relay packets to determine routing and filtering at each earth station.

106. The satellite of claim 105 wherein the system has less than sixteen earth stations.

107. A first earth station for use in a system having at least two other earth stations interconnected via a satellite wherein data from each earth stations is broadcast to the other earth stations, the first earth station comprising a data link, and a switch configured for packetizing data from data circuits into data packets, and filtering and routing down-link directed data packets based on the content of the data packets, wherein the switch packetizes the data packets using elementary error detection and is configurable to support frame relay based protocols.

108. The system of claim 107 wherein the switch is a frame-relay protocol based switch.

109. The system of claim 108 wherein the data packets are arranged based on a frame relay standard.

110. The system of claim 109 wherein the data packets are configured according to CCITT frame relay standards.

111. The earth station of claim 107 wherein the system has less than sixteen earth stations.

112. The system of claim 107 wherein the earth stations are configured to communicate using a single carrier per channel.

113. The system of claim 107 wherein the earth stations are configured to communicate using a time division multiple access protocol.

114. The system of claim 107 wherein the switch is configured to provide priority for data packets containing video data over data packets containing data from the data circuits.

115. A method comprising:

packetizing data from a data circuit into data packets, the data packets having frame relay based elementary error detection and being assembled at each of three earth stations;

using a satellite network to broadcast the data packets from each earth station directly to each of at least two other earth stations; and

filtering and routing down-link directed data packets at each earth station based upon the contents of the data packets using a switch supporting frame relay based protocols.

116. The method of claim 115 wherein packetizing data includes packetizing data using a frame-relay protocol based switch.

117. The method of claim 116 wherein packetizing data includes packetizing data based on a frame relay standard.

118. The method of claim 117 wherein packetizing data includes packetizing data in accordance with CCITT frame relay standards.

119. The method of claim 115 wherein there are less than sixteen earth stations.

120. The method of claim 115 including communicating between the earth stations using a single carrier per channel protocol.

121. The method of claim 115 including communicating between the earth stations using a time division multiple access protocol.

122. The method of claim 115 including providing priority within the switch for video data packets over data packets associated with the data circuit.

123. A method comprising:

sending frame relay protocol based data packets from a first earth station to both second and third earth stations;

sending frame relay protocol based data packets from the second earth station to both the first and third earth stations;

sending frame relay protocol based data packets from the third earth station to both the first and second earth station;

assembling the frame relay protocol based data packets from data links; and

filtering and routing data packets received from a satellite based on contents of down link directed data packets.

124. The method of claim 123 wherein filtering includes discarding frames using a frame-relay protocol based switch.

125. The method of claim 123 wherein assembling includes assembling data packets based on a frame relay standard.

126. The method of claim 125 wherein assembling includes assembling data packets in accordance with CCITT frame relay standards.

127. The method of claim 123 including using connectivity control software in a switch to dynamically configure the switch to provide multilayer addressing and filtering.

128. The method of claim 123 including communicating between the earth stations using a single carrier per channel protocol.

129. The method of claim 123 including communicating between the earth stations using a time division multiple access protocol.

130. The method of claim 123 including providing priority for video data packets over data packets associated with the data circuit.

131. A method comprising:

receiving at a first earth station data packets from at least two other earth stations via a satellite network;

assembling data packets at the first earth station from data received from data circuits;

filtering and routing down link directed data packets based on the contents of the data packets; and

configuring the data packets with elementary error detection using frame-relay based protocols.

132. The method of claim 131 wherein filtering and routing includes using a frame-relay protocol based switch.

133. The method of claim 131 wherein configuring the data packets includes configuring the data packets based on a frame relay standard.

134. The method of claim 133 wherein configuring the data packets includes configuring the data packets in accordance with CCITT frame relay standards.

135. The method of claim 131 including using connectivity control software in a switch to dynamically configure the switch to provide multilayer addressing and filtering.

136. The method of claim 131 wherein there are less than sixteen earth stations.

137. The method of claim 131 including communicating between the earth stations using a single carrier per channel protocol.

138. The method of claim 131 including communicating between the earth stations using a time division multiple access protocol.

139. The method of claim 131 including providing priority within the switch for video data packets over data packets associated with the data circuits.

140. In a first earth station, a method comprising:

receiving at a first earth station data packets broadcast from at least two other earth stations via a single hop mesh satellite network;

using a switch to filter and route down link directed data packets based on the contents of data packets; and

sending to a satellite frame relay protocol based data packets for broadcast to at least two other earth stations via the single hop mesh satellite network.

141. The method of claim 140 wherein the mesh satellite network has less than sixteen earth stations.

142. A first earth station for use in a system having at least two other earth stations interconnected via a satellite wherein data from each earth station is broadcast to the other earth stations, the first earth station comprising:

means for receiving and transmitting signals to and from a satellite;

means for inputting the data from data circuits, packetizing the data into data packets having a boundary flag, an address field, a data field, and a frame check sequence, and for discarding and routing down link directed data packets based on contents of the data packets.

143. The first earth station of claim 142 wherein the system has less than sixteen earth stations.

144. A system comprising a satellite, and first, second, and third earth stations interconnected via the satellite and configured for broadcasting uplink directed data to the other earth stations, each earth station including means for inputting data from a plurality of terminal devices, packetizing the data into frame relay protocol based data packets having an address field for filtering and routing down-link directed data packets based on the contents of the address field of the data packets.

145. A system comprising a satellite and first, second, and third earth stations interconnected via the satellite, wherein the first earth station sends data packets to the second and third earth stations, the second earth station sends data packets to the first and third earth station, and the third earth station sends data packets to the first and second earth station, each earth station including at least two voice circuits each generating a dial code, a data circuit, and a switch configured for inputting data from the voice circuits, packetizing the data into data packets having a frame boundary flag, an address field, a data field, and a frame check sequence, and discarding frames received from the satellite based on the contents of the down-link directed data packets, wherein the switch is configurable for supporting frame relay based protocols.

146. A method comprising:

relaying a first group of frames containing digital voice and a second group of frames containing digital data from a first earth station to second and third earth stations through a satellite;

relaying a third group of frames containing digital voice and a fourth group of frames containing digital data from the second earth station to the first and third earth stations through the satellite;

relaying a fifth group of frames containing digital voice and a sixth group of frames containing digital data from the third earth station to the first and second earth stations through the satellite;

determining, at the first earth station, first frames of the third and fourth groups of frames that are addressed to end terminal devices of the third earth station, and discarding the first frames;

determining, at the first earth station, second frames of the fifth and sixth groups of frames that are addressed to end terminal devices of the second earth station, and discarding the second frames;

determining, at the second earth station, third frames of the first and second groups of frames that are addressed to the end terminal devices of the third earth station, and discarding the third frames;

determining, at the second earth station, fourth frames of the fifth and sixth groups of frames that are addressed to end terminal devices of the first earth station, and discarding the fourth frames;

determining, at the third earth station, fifth frames of the first and second groups of frames that are addressed to the end terminal devices of the second earth station, and discarding the fifth frames; and

determining, at the third earth station, sixth frames of the third and fourth groups of frames that are addressed to the end terminal devices of the first earth station, and discarding the sixth frames,

whereby processing load is reduced and routing efficiency is increased so that bidirectional voice and data signaling capability is achieved between the end terminal devices of the first, second, and third earth stations.

147. A method for an earth station configured to communicate with at least two other earth stations via a satellite, to provide conditional access by a terminal coupled to the earth station to input frames each having an address, the method comprising the steps of:

receiving a frame relay based frame from the satellite;

determining the address from the frame;

comparing at least a portion of the address with predetermined data; and

either discarding the frame, or processing and transmitting the frame to the terminal through an interface, depending upon a result of the step of comparing,

thereby creating an efficient satellite network.

148. The method of claim 147, wherein the step of receiving includes receiving the frame having a format based on a frame relay format.

149. The method of claim 147, wherein the step of comparing includes comparing the at least a portion of the address with the predetermined data comprising a bit mask.

150. The method of claim 147, wherein the step of comparing includes comparing a portion of the address less than an entirety of the address with the predetermined data.

151. The method of claim 147, wherein the step of transmitting includes transmitting the frame through the interface comprising a virtual port of a frame relay switch.

152. A method for an earth station configured to communicate with at least two other earth stations via a satellite, to provide conditional access by a terminal coupled to the earth station to input data, and to process the input data, the method comprising the steps of:

receiving a frame from the satellite;

if the input data contains frames, for each frame;

determining an address of the frame,

comparing at least a portion of the address with predetermined data, and

either discarding the frame or processing the frame into output data depending upon a result of the step of comparing; and

if the input data contains computer data;

processing the computer data into output data, and

transmitting the output data to the terminal via an interface, thereby creating an efficient satellite network.

153. The method of claim 152, wherein the step of receiving includes receiving the frame having a format based on a frame relay format.

154. The method of claim 152, wherein the step of comparing includes comparing the at least a portion of the address with the predetermined data comprising a bit mask.

155. The method of claim 152, wherein the step of comparing includes comparing a portion of the address less than an entirety of the address:

with the predetermined data.

156. The method of claim 152, wherein the step of transmitting includes transmitting the frame through the interface comprising a virtual port of a frame relay switch.

157. An earth station configured to communicate with at least two other earth stations via a satellite, for providing conditional access by a terminal coupled to the earth station to input frames each having an address, the earth station comprising:

a receiver for receiving a frame from the satellite;

a switch for determining the address of the received frame, comparing at least a portion of the address with predetermined data, and either discarding the frame or processing the frame into output data depending upon a result of the step of comparing; and

an interface for transmitting the output data to the terminal,

thereby creating an efficient satellite network.

158. The method of claim 157, wherein the frame has a format based on a frame relay format.

159. The method of claim 157, wherein the predetermined data comprises a bit mask.

160. The method of claim 157, wherein the portion of the address is less than an entirety of the address.

161. The method of claim 157, wherein the interface comprises a virtual port of the switch.

162. A method of transmitting data in the form of packets in a satellite communication system, the method comprising the steps of:

transmitting a packet having a destination address from a first earth station to a satellite;

transmitting the packet from the satellite to a second earth station that includes a packet switch coupled to a first terminal device having a first device address;

transmitting the packet from the satellite to a third earth station;

comparing at the second earth station at least a portion of the destination address to at least a portion of the first device address; and

processing the packet with the packet switch when the at least portion of the destination address corresponds to at least a portion of the first device address.

163. The method of claim 162, wherein the third earth station includes a packet switch coupled to a plurality of second terminal devices having device addresses and further including the steps of:

determining at the third earth station that the at least portion of the destination address does not correspond to any portions of the second device addresses; and

discarding the packet.