Downloading operating system software through a broadcast channel

• US 5,666,293 A
• Filed: 07/03/1995
• Issued: 09/09/1997
• Est. Priority Date: 05/27/1994
• Status: Expired due to Term

• Current Assignee: Verizon Patent and Licensing Incorporated (Verizon Communications Inc.)
• Original Assignee: Bell Atlantic Network Services, Inc. (Verizon Communications Inc.)
• Inventors: Metz, Erik C., Darr, John W. Jr., Hudson, Henry G. Jr.
• Primary Examiner(s): Ramirez, Ellis B.
• Assistant Examiner(s): ASSOUAD, PATRICK J
• Application Number:
  US08/498,265
• Time in Patent Office: 799 Days
• Field of Search: 364/514 C, 380/10, 380/20, 370/112, 370/118, 348/7, 348/10, 348/12, 455/3.1, 455/4.1, 455/4.2, 455/5.1, 455/6.1
• US Class Current: 709/220
• CPC Class Codes: G06F 8/60 Software deployment
• CPC Class Codes: G06F 8/65 Updates security arrangements therefor G06F21/57
• CPC Class Codes: G06F 9/4401 Bootstrapping security arrangements therefor G06F21/57
• CPC Class Codes: H04L 2012/5616 Terminal equipment, e.g. codecs, synch.
• CPC Class Codes: H04L 2012/563 Signalling, e.g. protocols, reference model
• CPC Class Codes: H04L 2012/5642 Multicast/broadcast/point-multipoint, e.g. VOD
• CPC Class Codes: H04L 2012/5653 using the ATM adaptation layer [AAL]
• CPC Class Codes: H04L 2012/5658 using the AAL5
• CPC Class Codes: H04L 2012/567 Frame Relay over ATM
• CPC Class Codes: H04N 21/235 Processing of additional data, e.g. scrambling of additional data or processing content descriptors
• CPC Class Codes: H04N 21/23614 Multiplexing of additional data and video streams arrangements for simultaneous broadcast of plural pieces of information H04H20/28
• CPC Class Codes: H04N 21/23617 by inserting additional data into a data carousel, e.g. inserting software modules into a DVB carousel arrangements for broadcast or for distribution of identical information repeatedly in broadcast distribution systems H04H20/16
• CPC Class Codes: H04N 21/2381 Adapting the multiplex stream to a specific network, e.g. an Internet Protocol [IP] network transmission of MPEG streams over ATM H04L12/5601
• CPC Class Codes: H04N 21/42204 User interfaces specially adapted for controlling a client device through a remote control device; Remote control devices therefor constructive details of casings for the remote control device H01H9/0235; user interfaces for controlling a tuning device of a television receiver through a remote control H03J9/00; remote control of peripheral devices connected to a television receiver through the remote control device of the television receiver H04B1/205
• CPC Class Codes: H04N 21/426 Internal components of the client ; Characteristics thereof H04N5/44 takes precedence
• CPC Class Codes: H04N 21/42684 Client identification by a unique number or address, e.g. serial number, MAC address, socket ID network arrangements, protocols or services for addressing or naming H04L61/00
• CPC Class Codes: H04N 21/4316 for displaying supplemental content in a region of the screen, e.g. an advertisement in a separate window
• CPC Class Codes: H04N 21/434 Disassembling of a multiplex stream, e.g. demultiplexing audio and video streams, extraction of additional data from a video stream; Remultiplexing of multiplex streams; Extraction or processing of SI; Disassembling of packetised elementary stream demultiplexing of data packets for data networks, e.g. RTP/UDP H04L65/00
• CPC Class Codes: H04N 21/4348 Demultiplexing of additional data and video streams
• CPC Class Codes: H04N 21/435 Processing of additional data, e.g. decrypting of additional data, reconstructing software from modules extracted from the transport stream
• CPC Class Codes: H04N 21/4383 : Accessing a communication channel
• CPC Class Codes: H04N 21/443 : OS processes, e.g. booting an STB, implementing a Java virtual machine in an STB or power management in an STB
• CPC Class Codes: H04N 21/4431 : characterized by the use of Application Program Interface [API] libraries
• CPC Class Codes: H04N 21/4516 : involving client characteristics, e.g. Set-Top-Box type, software version or amount of memory available
• CPC Class Codes: H04N 21/454 : Content or additional data filtering, e.g. blocking advertisements
• CPC Class Codes: H04N 21/4586 : Content update operation triggered locally, e.g. by comparing the version of software modules in a DVB carousel to the version stored locally deployment, distribution, installation, update of software G06F8/65; error detection or correction of the data by redundancy during software upgrading G06F11/1433; arrangements for updating broadcast information or broadcast-related information H04H60/25
• CPC Class Codes: H04N 21/47 : End-user applications
• CPC Class Codes: H04N 21/64307 : ATM
• CPC Class Codes: H04N 21/6543 : for forcing some client operations, e.g. recording remote booting in general G06F9/4416
• CPC Class Codes: H04N 21/8166 : involving executable data, e.g. software arrangements for executing specific programs G06F9/44; broadcasting computer programmes in broadcast systems H04H20/91; involving the movement of software or configuration parameters H04L67/34
• CPC Class Codes: H04N 21/818 : OS software
• CPC Class Codes: H04N 7/17318 : Direct or substantially direct transmission and handling of requests
• CPC Class Codes: H04Q 11/0478 : Provisions for broadband connections

Abstract

Set-top terminals utilized in broadband broadcast networks are becoming increasingly intelligent. Upgrading the operation of such terminals periodically requires upgrading the software, particularly the operating system, of the programmable processor which controls the terminal operation. To facilitate frequent upgrades, the network will carry a cyclic broadcast of a packetized data file containing the operating system. Periodically, a terminal will capture and store the broadcast operating system. In the preferred embodiment, the broadcast includes operating system files for a number of different terminal types and data identifying the current broadcast version of the operating system for each type of terminal. The terminal will check the broadcast version number for its terminal type operating system. If the broadcast version number differs from the version number for the operating system the terminal currently is running, then the terminal will capture only the file containing the operating system for the corresponding terminal type.

Claims

1. A set-top terminal device comprising:

a network interface module adapted to couple the terminal to a communication network for receiving at least selected ones of a plurality of broadcast digital broadband channels at least one of which carries audio/video program information in compressed, digital form in packets of a standardized format and at least one of which carries cyclically repetitive transmissions of operating system software in packets of the standardized format, wherein said network interface module receives an Asynchronous Transfer Mode (ATM) cell stream and extracts packets of the standardized format from payloads of ATM cells; and

a digital entertainment terminal comprising;

(a) an audio/video processor responsive to at least some of the packets extracted by the network interface module for processing the compressed, digital audio/video program information;

(b) a memory;

(c) means for receiving inputs from a user; and

(d) a control processor controlling operations of the set-top terminal;

wherein said control processor captures said operating system software from at least some of the packets extracted by the network interface module for one of the selected digital broadband channels within a transmission cycle, loads the captured operating system software into the memory and begins operation in accord with the operating system software loaded into the memory, said control processor controlling the network interface module and the audio/video processor in response to the user inputs in accord with the operating system software loaded in said memory.

2. A device as recited in claim 1, wherein said memory comprises a non-volatile random access memory.

3. A device as recited in claim 2, wherein said non-volatile random access memory comprises a flash memory.

4. A device as recited in claim 1, wherein said digital entertainment terminal further comprises a random access memory storing applications software for use by said control processor while running the operating system software.

5. A device as recited in claim 1, wherein said audio/video processor comprises:

an audio decoder for decoding compressed, digital audio information;

a video decoder for decoding compressed, digital video information; and

a packet demultiplexer for analyzing packet identifiers contained in the packets of the standardized format to identify packets containing compressed, digital audio information and to route information from those packets to the audio decoder, to identify packets containing compressed, digital video information and to route information from those packets to the video decoder, and to identify packets containing operating system software and route software from those packets to the control processor.

6. A device as recited in claim 5, wherein:

the audio decoder comprises an MPEG audio decoder;

the video decoder comprises an MPEG video decoder; and

the packet demultiplexer is an MPEG demultiplexer.

7. A device as recited in claim 5, wherein said network interface module supplies the extracted packets to the packet demultiplexer.

8. A device as recited in claim 1, wherein said digital entertainment terminal further comprises a memory storing a routine which the control processor executes to control capturing of the operating system software.

9. A communication system comprising:

a source system comprising;

(a) a program source supplying a broadband program signal,

(b) a software server cyclically outputting a data file containing an operating system, and

(c) an encoder system for packetizing the broadband program signal and the data file in digital packets of a standard format, wherein said encoder system comprises an encoder for digitizing and compressing the broadband program signal into program data and encapsulating the program data in a sequence of packets of the standard format, a data module for encapsulating the data file containing an operating system in a sequence of packets of the standard format, and an Asynchronous Transfer Mode (ATM) multiplexer for combining the packets containing the broadband program information and the packets containing the data file into a single stream for broadcast through the network on a single one of the channels;

a digital network broadcasting a plurality of digital broadband channels, said digital network receiving and broadcasting the digital packets from the encoder system on at least one of the channels; and

a plurality of set-top terminal devices, each set-top terminal device comprising;

(1) an interface coupled to the digital network for receiving at least a selected one of the channels, selectively including at least one channel carrying packets containing the broadband program information, and at least one channel carrying packets containing the operating system data file;

(2) a program signal processor for processing the packets containing the broadband program information;

(3) a memory;

(4) means for receiving inputs from a user; and

(5) a control processor controlling operations of the set-top terminal;

wherein said control processor captures said operating system data file from a selected one of the digital broadband channels, loads the captured operating system into the memory and begins operation in accord with the operating system loaded into the memory, said control processor controlling the interface and the program signal processor in response to the user inputs in accord with the operating system loaded in said memory.

10. A communication system as recited in claim 9, wherein said encoder for digitizing and compressing the broadband program signal comprises a real time encoder for digitizing and compressing an audio/video program signal.

11. A communication system as recited in claim 10, wherein said real time encoder comprises an MPEG encoder.

12. A communication system as recited in claim 9, wherein said digital network comprises:

a first optical fiber receiving the digital packets from the encoder system;

a second optical fiber receiving packets containing broadband program information from another source system;

a system of optical fibers for broadcasting the digital packets from the encoder system on at least a first one of the channels and for broadcasting the packets containing the broadband program information from another source on at least a second one of the channels; and

a plurality of host digital terminals each coupled between the system of optical fibers and a group of the set-top terminals for routing selected ones of the channels to set-top terminals in each group.

13. In a digital network broadcasting packetized audio/video program information through a plurality of digital broadband channels to a plurality of digital terminals connected to the network, a method comprising the steps of:

cyclically broadcasting an operating system together with predetermined identification data relating to the operating system on one digital broadband channel;

selectively receiving the one digital broadband channel and capturing the predetermined identification data;

comparing the captured predetermined identification data to identification data stored in one of the digital terminals;

based on the results of the comparison, capturing a copy of the operating system from the cyclical broadcast;

initiating operating of the one digital terminal in accord with the captured copy of the operating system;

receiving and storing application software in the one digital terminal via a digital communication link through the network; and

executing the application software under control of the captured copy of the operating system.

14. A method as recited in claim 13, wherein the predetermined identification data identifies a terminal type, and the operating system is stored if the terminal type identified by the predetermined identification data matches terminal type identification data stored in the one terminal.

15. A method as recited in claim 13, wherein the predetermined identification data identifies a version number of the operating system being broadcast, and the operating system is stored if the version number identified by the predetermined identification data is different from a version number of an operating system previously stored in the one terminal.

16. A method as recited in claim 13, wherein the operating system comprises:

a microprocessor operating system;

at least one driver routine used by a microprocessor to control components of a terminal; and

a resident application controlling at least selection of channels through the network in response to user inputs.

17. A method as recited in claim 13, wherein the digital communication link comprises one of the digital broadband channels.

18. A method as recited in claim 13, wherein the digital communication link comprises a broadband point-to-point link.

19. A method comprising:

encoding a plurality of broadband program information signals as digitized, compressed data in packet streams of a standard format;

cyclically generating a first data file containing an operating system comprising code executable by a first type of terminal and a data file containing an operating system comprising code executable by a second type of terminal different in type from the first type of terminal;

forming a sequence of packets in the standard format including;

packets containing the first data file and a first identifier, packets containing the second data file and a second identifier, and at least one packet containing data associating the first and second identifiers with the first and second types of terminal, respectively;

broadcasting the packet streams and the sequence of packets on a plurality of multiplexed channels;

in a receiving terminal of a predetermined type;

(a) selectively receiving a channel carrying the sequence of packets;

(b) capturing said at least one packet;

(c) identifying the first type of terminal or the second type of terminal as corresponding to the predetermined type of the receiving terminal;

(d) recognizing the first or second identifier as associated with the identified terminal type;

(e) using the recognized identifier to capture a copy of the operating system for the identified terminal type from the sequence of packets; and

(f) executing at least a portion of the code from the captured copy of the operating system for the identified terminal type to initiate operation of the receiving terminal, the operation of the receiving terminal including reception of a user selected channel carrying a packet stream and processing digitized, compressed data from that packet stream to present broadband program information to a user in humanly perceptible form.

20. A method as recited in claim 19, wherein:

the step of using the recognized identifier to capture a copy of the operating system comprises storing payload data from packets containing the recognized identifier in random access memory; and

the step of initiating operation comprises transferring the payload data from the random access memory to a non-volatile memory, and booting up the receiving terminal from the payload data in the nonvolatile memory.

21. A method as recited in claim 19, further comprising encoding another broadband program information signal as digitized, compressed data in another packet stream of a standard format,

wherein the step of broadcasting comprises:

multiplexing the sequence of packets and said another packet stream into one channel stream, and

broadcasting the one channel stream through one of the multiplexed channels.

22. A method comprising:

encoding a plurality of broadband program information signals as digitized, compressed data in packet streams of a standard format;

cyclically generating a first data file containing an operating system for a first type of terminal and a data file containing an operating system for a second type of terminal;

forming a sequence of packets in the standard format including;

packets containing the first data file and a first identifier, packets containing the second data file and a second identifier, and at least one packet containing data associating the first and second identifiers with the first and second types of terminal, respectively;

broadcasting the packet streams and the sequence of packets on a plurality of multiplexed channels,

wherein the multiplexed channels comprise Asynchronous Transfer Mode (ATM) virtual circuits, each virtual circuit being identified by a different virtual path identifier/virtual circuit identifier (VPI/VCI) value;

in a receiving terminal of a predetermined type;

(a) selectively receiving a channel carrying the sequence of packets;

(b) capturing said at least one packet;

(c) identifying the first type of terminal or the second type of terminal as corresponding to the predetermined type of receiving terminal;

(d) recognizing the first or second identifier as associated with the identified terminal type;

(e) using the recognized identifier to capture a copy of the operating system for the identified terminal type from the sequence of packets; and

(f) initiating operation of the receiving terminal in accord with the captured copy of the operating system for the identified terminal type, operation of the receiving terminal including reception of a user selected channel carrying a packet stream and processing digitized, compressed data from that packet stream to present broadband program information to a user in humanly perceptible form.

23. A method as recited in claim 22, wherein the step of selectively receiving a channel comprises receiving and processing ATM cells containing a VPI/VCI value assigned to the selectively received channel.

24. A method comprising:

encoding a plurality of broadband program information signals as digitized, compressed data in packet streams of a standard format;

cyclically generating a first data file containing an operating system comprising code executable by a first type of terminal and a data file containing an operating system comprising code executable by a second type of terminal different in type from the first type of terminal;

forming a sequence of packets in the standard format including;

packets containing the first data file and a first identifier, packets containing the second data file and a second identifier, and at least one packet containing data associating the first and second identifiers with the first and second type of terminal and first and second operating system version numbers, respectively;

broadcasting the packet streams and the sequence of packets on a plurality of multiplexed channels;

in a receiving terminal of a predetermined type;

selectively receiving a channel carrying the sequence of packets;

capturing said at least one packet;

from the data in said at least one packet, identifying the first type of terminal or the second type of terminal as corresponding to the predetermined type of the receiving terminal;

from the data in said at least one packet, identifying the version number for the identified terminal type;

if the identified version number differs from a version number of an operating system previously stored in the receiving terminal, recognizing the first or second identifier as associated with the identified terminal type and using the recognized identifier to capture a copy of the operating system for the identified terminal type from the sequence of packets; and

executing at least a portion of the code from the captured copy of the operating system for the identified terminal type to initiate operation of the receiving terminal, the operation of the receiving terminal including reception of a user selected channel carrying a packet stream and processing digitized, compressed data from that packet stream to present broadband program information to a user in humanly perceptible form.

25. A method as recited in claim 24, wherein:

the step of using the recognized identifier to capture a copy of the operating system comprises storing payload data from packets containing the recognized identifier in random access memory; and

the step of initiating operation comprises transferring the payload data from the random access memory to a non-volatile memory, and booting up the receiving terminal from the payload data in the non-volatile memory.

26. A method as recited in claim 24, further comprising encoding another broadband program information signal as digitized, compressed data in another packet stream of a standard format,

wherein the step of broadcasting comprises:

multiplexing the sequence of packets and said another packet stream into one channel stream, and

broadcasting the one channel stream through one of the multiplexed channels.

27. A method comprising:

encoding a plurality of broadband program information signals as digitized, compressed data in packet streams of a standard format;

cyclically generating a first data file containing an operating system for a first type of terminal and a data file containing an operating system for a second type of terminal;

forming a sequence of packets in the standard format including;

packets containing the first data file and a first identifier, packets containing the second data file and a second identifier, and at least one packet containing data associating the first and second identifiers with the first and second type of terminal and first and second operating system version numbers, respectively;

broadcasting the packet streams and the sequence of packets on a plurality of multiplexed channels,

wherein the multiplexed channels comprise Asynchronous Transfer Mode (ATM) virtual circuits, each virtual circuit being identified by a different virtual path identifier/virtual circuit identifier (VPI/VCI) value;

in a receiving terminal of a predetermined type;

selectively receiving a channel carrying the sequence of packets;

capturing said at least one packet;

from the data in said at least one packet, identifying the first type of terminal or the second type of terminal as corresponding to the predetermined type of receiving terminal;

from the data in said at least one packet, identifying the version number for the identified terminal type;

if the identified version number differs from a version number of an operating system previously stored in the receiving terminal, recognizing the first or second identifier as associated with the identified terminal type and using the recognized identifier to capture a copy of the operating system for the identified terminal type from the sequence of packets; and

initiating operation of the receiving terminal in accord with the captured copy of the operating system for the identified terminal type, operation of the receiving terminal including reception of a user selected channel carrying a packet stream and processing digitized, compressed data from that packet stream to present broadband program information to a user in humanly perceptible form.

28. A method as recited in claim 27, wherein the step of selectively receiving a channel comprises receiving and processing ATM cells containing a VPI/VCI value assigned to the selectively received channel.

29. A method comprising:

selectively receiving in a terminal an Asynchronous Transfer Mode (ATM) digital broadcast channel identified by a virtual path identifier/virtual circuit identifier (VPI/VCI) value and carrying a digital transport stream of packets;

capturing at least one packet of data from the digital transport stream;

from the data in said at least one packet, identifying a version number for an operating system carried in the digital transport stream;

if the identified version number differs from a version number of an operating system previously stored in the terminal, capturing the operating system from the transport stream; and

initiating operation of the terminal in accord with the captured copy of the operating system, operation of the terminal including reception of a user selected ATM channel and processing digitized, compressed data from the user selected ATM channel to present broadband program information to a user in humanly perceptible form.

30. A method as recited in claim 29 further comprising the step of initiating the method in response to a predetermined user input.

31. A method as recited in claim 29, further comprising the step of automatically initiating the method in response to a predetermined event.

32. A method as received, in claim 31, wherein the predetermined event is passage of a specified time period.

33. A method as received in claim 31, wherein the predetermined event comprises turn-off of the terminal.

34. A method as recited in claim 29, further comprising the steps of:

counting each occurrence of an `off` instruction input to the terminal from a user; and

when the count reaches a predetermined value, initiating the method.

35. A communication system comprising:

a source system supplying a broadband program signal, and a cyclically repeating data file containing an operating system, said broadband program signal and the data file being encoded in digital packets of a standard format;

an Asynchronous Transfer Mode (ATM) digital network broadcasting a plurality of digital broadband channels in virtual circuits, each virtual circuit being identified by a different virtual path identifier/virtual circuit identifier (VPI/VCI) value, said digital network receiving and broadcasting the digital packets from the source system on at least one of the channels; and

a plurality of set-top terminal devices, each set-top terminal device comprising;

(1) an interface coupled to the digital network for receiving at least a selected one of the channels, selectively including at least one channel carrying packets containing the broadband program information, and at least one channel carrying packets containing the operating system data file;

(2) a program signal processor for processing the packets containing the broadband program information;

(3) a memory;

(4) means for receiving inputs from a user; and

(5) a control processor controlling operations of the set-top terminal;

wherein said control processor captures said operating system data file from a selected one of the digital broadband channels, loads the captured operating system into the memory and begins operation in accord with the operating system loaded into the memory, said control processor controlling the interface and the program signal processor in response to the user inputs in accord with the operating system loaded in said memory.

36. A communication system as recited in claim 35, wherein said source system comprises:

an encoder for digitizing and compressing the broadband program signal into program data and encapsulating the program data in a sequence of packets of the standard format; and

a data module for encapsulating the data file containing an operating system in a sequence of packets of the standard format.

37. A communication system as recited in claim 36, wherein said source system further comprises a multiplexer for combining the packets containing the broadband program information and the packets containing the data file into a single stream for broadcast through the network on a single one of the channels.

38. A set-top terminal device comprising:

a network interface module adapted to couple the terminal to a communication network for receiving at least selected ones of a plurality of broadcast digital broadband channels at least one of which carries audio/video program information in compressed, digital form in packets of a standardized format and at least one of which carries cyclically repetitive transmissions of operating system software in packets of the standardized format; and

a digital entertainment terminal comprising;

(a) an audio/video processor for processing the compressed, digital audio/video program information;

(b) an operating system memory;

(c) a random access memory;

(d) means for receiving inputs from a user; and

(e) a control processor controlling operations of the set-top terminal, wherein

said control processor captures said operating system software from one of the selected digital broadband channels within a transmission cycle, loads the captured operating system software into the operating system memory and begins operation in accord with the operating system software loaded into the operating system memory,

said control processor captures application software received through the network interface module, stores captured application software in the random access memory and executes the stored application software under control of the captured copy of the operating system, and

said control processor controls the network interface module and the audio/video processor in accord with the operating system software loaded in said operating system memory, and controls at least some responses to the user inputs with the application software.

39. A device as recited in claim 38 wherein said audio/video processor comprises:

an audio decoder for decoding compressed, digital audio information;

a video decoder for decoding compressed, digital video information; and

a packet demultiplexer for analyzing packet identifiers contained in the packets of the standardized format to identify packets containing compressed, digital audio information and to route information from those packets to the audio decoder, to identify packets containing compressed, digital video information and to route information from those packets to the video decoder, and to identify packets containing operating system software and application software and route software from those packets to the control processor.

40. A device as recited in claim 39, wherein:

the audio decoder comprises an MPEG audio decoder;

the video decoder comprises an MPEG video decoder; and

the packet demultiplexer is an MPEG demultiplexer.

41. A device as recited in claim 39, wherein said network interface module receives an Asynchronous Transfer Mode (ATM) cell stream, extracts packets of the standardized format from payloads of ATM cells and supplies the extracted packets to the packet demultiplexer.

42. A communication system comprising:

a source'"'"'system comprising;

(a) a program source supplying a broadband program signal,

(b) a software server cyclically outputting a data file containing an operating system, and

(c) an encoder system for packetizing the broadband program signal and the data file in digital packets of a standard format;

a digital network broadcasting a plurality of digital broadband channels, said digital network receiving and broadcasting the digital packets from the encoder system on at least one of the channels and transporting an application program through at least one digital broadband channel; and

a plurality of set-top terminal devices, each set-top terminal device comprising;

(1) an interface coupled to the digital network for receiving at least a selected one of the channels,

(2) a program signal processor for processing packets containing the broadband program information received through the interface,

(3) an operating system memory,

(4) a random access memory for storing the application program when received through the interface,

(5) means for receiving inputs from a user, and

(5) a control processor controlling operations of the set-top terminal,

wherein said control processor captures said operating system data file from a selected one of the digital broadband channels, loads the captured operating system into the memory and begins operation in accord with the operating system loaded into the memory, said control processor executing the application program from the random access memory and controlling the interface and the program signal processor in accord with the operating system loaded in said memory and controlling at least some responses to user inputs in accord with the application program.

43. A communication system as recited in claim 42, wherein said encoder system further comprises a multiplexer for combining the packets containing the broadband program information and the packets containing the data file into a single stream for broadcast through the network on a single one of the channels.

44. A communication system as recited in claim 43, wherein said multiplexer is an Asynchronous Transfer Mode (ATM) multiplexer.

45. A communication system as recited in claim 44, wherein said digital network comprises:

a first optical fiber receiving the digital packets from the encoder system;

a second optical fiber receiving packets containing broadband program information from another source system;

a system of optical fibers for broadcasting the digital packets from the encoder system on at least a first one of the channels and for broadcasting the packets containing the broadband program information from another source on at least a second one of the channels; and

a plurality of host digital terminals each coupled between the system of optical fibers and a group of the set-top terminals for routing selected ones of the channels to set-top terminals in each group.