Protocol conversion system

• US 5,182,748 A
• Filed: 10/18/1990
• Issued: 01/26/1993
• Est. Priority Date: 10/20/1989
• Status: Expired due to Term

• Current Assignee: KDDI Corporation
• Original Assignee: Kokusai Denshi Denwa Company Limited (KDDI Corporation)
• Inventors: Yamagata, Hisao, Ochiai, Kunio, Ito, Yasuo, Sakata, Shigekazu
• Primary Examiner(s): Olms, Douglas W.
• Assistant Examiner(s): BLUM, RUSSELL
• Application Number:
  US07/599,786
• Time in Patent Office: 831 Days
• Field of Search: 370/94.1, 370/79, 370/60
• US Class Current: 370/466
• CPC Class Codes: H04L 9/40 Network security protocols

Abstract

An X.25 protocol apparatus can communicate with another X.25 apparatus or a X.32 apparatus through a telephone network, an ISDN network, or a PBX network, by attaching protocol conversion system to the X.25 apparatus. The conversion system has a pair of signal identification portions (1, 6) for separating a receive packet to a data packet and a control packet, a call process portion (3, 12) for dial signal process, and an address table (4) and a packet edition portion (5) for address conversion of a control packet. A data packet is forwarded from one signal identification portion to another signal identification portion through direct path (53). A control packet is forwarded to a control packet identification portion (2) for control process which includes dial signal process, address conversion, and protocol sequences. This system is applicable to couple a data communication network which has a X.32 correspondence portion to another data communication network.

Claims

1. A protocol conversion system (FIGS. 1, 2, 3, 4 and 8) coupled with an X.25 apparatus and one of networks including a telephone network, an ISDN network and a PBX network for allowing said X.25 apparatus to couple with another X.25 apparatus through one of said networks, comprising;

a first signal identification portion (1) coupled with said X.25 apparatus,

a second signal identification portion (6) coupled with one of said networks,

a control packet identification portion (2) coupled between said signal identification portions (1,

     6),

a call process portion (3) coupled with said control packet identification portion (2) and said second signal identification portion (6),

an address table (4) and a packet edition portion (5) coupled with said control packet identification portion (2) and said signal identification portions (1,

     6),

a common control (10) and a keypad (11) for common control and initialization of each of said elements, and

a direct path (53) coupling said signal identification portions (1,

     6), wherein

each of said signal identification portions (1,

     6) separates received packets into data packets and control packets, said data packets being forwarded to another signal identification portion (6,

     1) through said direct path (53), and said control packets being forwarded to said control packet identification portion (2),

said call process portion (3) processes a dial signal for connection and disconnection, and

said address table (4) and said packet edition portion process address conversion of a control packet, and wherein

connection operation is carried out by control packets CR, CC, CN and CA between the present conversion system and said X.25 apparatus, and the packets for X.32 protocol between the present conversion system and one of said networks including address conversion of a packet,

data transfer is carried out by transferring a data packet through said direct path (53), and

disconnect operation is carried out by control packets CQ, CF, and CI between the X.25 apparatus and the present conversion system, and the packets for X.32 protocol between the present conversion system and one of said networks.

3. A protocol conversion system (FIG. 8) according to claim 1, wherein a pair of present conversion systems are coupled with a corresponding pair of X.25 apparatuses, and one network selected from a group of networks consisting of a telephone network, an ISDN network, and a PBX network is connected between said present conversion systems.

4. A protocol conversion system according to claim 1, wherein a data packet (DT) has a specific format which operates as a CQ packet.

2. A protocol conversion system (FIGS. 5, 6, and 7) coupled between a pair of networks selected from a telephone network, an ISDN network and a PBX network, comprising;

a first signal identification portion (1) coupled with one of said networks,

a second signal identification portion (6) coupled with the other network,

a control packet identification portion (2) coupled between said signal identification portions (1,6),

a pair of call process portions (12,

     3) coupled with said control packet identification portion (2), and related signal identification portion (1,

     6),

an address table (4) and a packet edition portion (5) coupled with said control packet identification portion (2) and said signal identification portions (1,

     6),

an address table (4) and a packet edition portion (5) coupled with said control packet identification portion (2) and said signal identification portions (1,

     6), and

a common control (10) and a keypad (11) for common control and initialization of each of said elements,

a direct path (53) coupling said signal identification portions (1,

     6), wherein

each of said signal identification portions (1,

     6) separates received packets into data packets and control packets, said data packets being forwarded to another signal identification portion (6,

     1) through said direct path (53), and said control packets being forwarded to said control packet identification portion (2),

said call process portions (3,

     12) process a dial signal for connection and disconnection, and

said address table (4) and said packet edition portion process address conversion, and wherein

connect operation is carried out by connecting one of said networks to the present conversion system, and next connecting the present invention system to the other network,

data transfer is carried out by transferring a data packet between said signal identification portions (1,

     6) through said direct path (53), and

disconnect operation is carried out by disconnecting one of said networks from the present conversion system, and next disconnecting the present conversion system from the other network.