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  1. STRUCTURE OF KA9Q NET (PE1CHL VERSION)
  2.  
  3. This picture clarifies the relation between the different protocol components
  4. present in the PE1CHL version of NET.
  5. Transfer of information is only possible crossing horizontal lines in this
  6. picture.  E.G: Information can be transferred from TELNET to TCP, but not from
  7. TELNET to NET/ROM level 7.
  8.  
  9. +----------------------------------------------------------------------------+
  10. |                                                                            |
  11. |                        U S E R   I N T E R F A C E                         |
  12. |                                                                            |
  13. +------------------+-------------------+--------+-----+------+------+--------+
  14. |                  |                   |        |     |      |      |        |
  15. | TNC, MHEARD,     |   NET/ROM level 7 | TELNET | FTP | SMTP | RCMD | REMOTE |
  16. |                  |                   |        |     |      |      |        |
  17. | NETDIGI, BRIDGE, | +-----------------+--------+-----+------+------+--------+
  18. |                  | |                 |                            |        |
  19. | TNC2 EMULATOR    | | NET/ROM level 4 |             TCP            |  UDP   |
  20. |                  | |                 |                            |        |
  21. |                  | +-----------------+----------------------------+--------+
  22. |                  | |                 |                                     |
  23. |                  | |                 |             IP / ICMP               |
  24. |                  | | NET/ROM level 3 |                                     |
  25. |                  | |                 +----+---------------------+          |
  26. |                  | |                      |                     |          |
  27. +------------------+-+----------------------+----+                |          |
  28. |                                                |      ARP       |          |
  29. |   AX.25 Level 2 Version 1 / 2  (LAPB / UI)     |                |          |
  30. |                                                |                |          |
  31. +--------------------------+---------------------+----------------+----------+
  32. |                          |                     |                |          |
  33. | Direct HDLC (SCC Driver) |  KISS (MBBIOS/X00)  |    Ethernet    |   SLIP   |
  34. |                          |                     |                |          |
  35. +--------------------------+---------------------+----------------+----------+
  36.          |                         |                      |           |
  37.          | /|                      | /|                   |           | /|
  38.          |/ |                      |/ |                   |           |/ |
  39.             |                         |                   |              |
  40.             v                         v                   |              v
  41.           MODEM                      TNC             //=======//    Other Sys
  42.  
  43.  
  44. TNC, MHEARD, NETDIGI, BRIDGE and TNC2 EMULATOR are the AX.25 servers.
  45. NET/ROM level 7 is the NET/ROM command interpreter.  It is both an AX.25 and
  46. a NET/ROM level 4 server.
  47. TELNET, FTP, SMTP, RCMD and FINGER (not shown) are the TCP/IP servers.
  48. REMOTE is a UDP/IP server.
  49.  
  50. NET/ROM level 4 is the transport protocol of the NET/ROM stack.  It manages
  51. connections between NET/ROM endnodes.
  52. TCP is the transport protocol of the Internet Suite.  It manages connections
  53. between endnodes in the TCP/IP world.
  54. UDP is the datagram protocol of the Internet Suite.  It is comparable to the UI
  55. frame transmissions of AX.25.
  56.  
  57. NET/ROM level 3 is the network protocol of the NET/ROM stack.  It manages the
  58. routing of packets between NET/ROM endnodes, relying on a table built from
  59. information received in NODES transmissions.
  60. IP/ICMP is the network protocol of the Internet Suite.  This implementation
  61. routes packets based on a fixed routing table.
  62.  
  63. ARP manages the mapping of Internet addresses to the addresses of the
  64. underlying network.  In the case of NET these can be amateur callsigns or
  65. Ethernet hardware addresses.
  66.  
  67. AX.25 Level 2 manages all packet traffic on the amateur packet radio network.
  68. it supports both virtual circuit (LAPB) and datagram (UI) modes.
  69. Virtual circuits can be used directly by AX.25 servers, by NET/ROM level 3, and
  70. by IP.  Datagrams are only used by IP.
  71.  
  72. The drivers for HDLC, KISS, Ethernet and SLIP manage the physical lines
  73. connected to the system.  The HDLC driver provides AX.25 packets directly,
  74. making only a MODEM necessary for amateur radio packet communication.
  75. The KISS driver provides the same information encoded in KISS frames, which
  76. will be sent to a TNC (in asynchronous form) for conversion to HDLC.
  77. The Ethernet and SLIP drivers provide ways to connect systems for IP traffic
  78. using either an Ethernet LAN or an asynchronous connection.
  79.  
  80.  
  81. Rob Janssen, PE1CHL
  82.