JPH02134943A - X.25 gateway device - Google Patents

Abstract

PURPOSE:To reduce the number of calls to be managed and to simplify the processing of call connection and disconnection by collectively managing X.15 packet calls to another same region LAN. CONSTITUTION:X.25 gateway devices 1 and 2 include X.25 packet interface parts 3 having the function based on CCITT recommendation X.25, LAN interface parts 4 having the function for connection to a bus type LAN where a variable length frame is handled in the datagram system, and control parts 5 which control them, and control parts 5 include a connected LAN address storage tables 6 to manage call connection and call state storage tables 7. A LAN storage host 10 is stored in a bus type LAN 8 connected to the X.25 gateway device 1, and a LAN storage host 12 is stored in a bus type LAN 8 connected to the X.25 gateway device 2 and X.25 packet interface parts 3 are connected to a public packet network 9. Thus, X.25 packet calls to another same region LAN are collectively managed to reduce the number of calls to be managed, and the processing of call connection and disconnection is simplified.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to an X,25 gateway device, and particularly to an
The present invention relates to a gateway device.

[Conventional technology]

FIG. 3 is an explanatory diagram illustrating conventional call connection. The conventional X, 25 gateway device 21 manages packet calls on a LAN accommodating host 23 or LAN accommodating terminal 24 unit.

In this case, X, 25 connects the local bus type LAN 22 to the other district bus type LAN 22 via the public packet network.
Packet calls are connected by always keeping in mind the internal addresses of the bus-type LAN 22, and are completely end-to-end connections, that is, connections that are completed between the LAN accommodation hosts 23 or the I-AN accommodation terminals 24. was in control. The connection routes are shown in Figure 3 as connection routes A, B, and C.
Shown as

[Problem to be solved by the invention]

The conventional X,25 gateway device described above has one L
An AN accommodation host or one LAN accommodation terminal has an end-to-end connection with one LAN accommodation host or one LAN accommodation terminal in another area via the public packet network. It is necessary to set up a new call in response to a new data transfer request, and call disconnection is also managed for each call, so the number of calls to be managed is limited to the number of calls that can be accommodated in the LAN. There is a set number of LAN accommodation hosts and LAN accommodation terminals, and there are problems in that an increase in the amount of processing becomes a bottleneck as well as management constraints regarding the number of accommodation.

It is an object of the present invention to transmit X, 25 packet calls to
By managing everything for the AN in one place, the number of calls to be managed is reduced, and call connection and call disconnection processes are simplified, resulting in a simpler and more economical X,25 gateway device. It is about providing.

[Means to solve the problem]

The x,25 gateway device of the present invention includes a packet interface unit having functions based on CCITT recommendations
A LAN interface section that has the function of connecting to an AN;
Controls the packet interface unit and the LAN interface unit, receives data transfer requests from the local LAN to which the local area is connected to other area LANs connected via the public packet network, and performs call setup and multiple call settings. The configuration includes a control unit including a connection LAN address storage table and a call state storage table for collectively managing the local area LAN and other local LANs.

〔Example〕

Next, embodiments of the present invention will be described with reference to the drawings.

FIG. 1 is a block diagram of one embodiment of the present invention.

X, 25 gateway devices 1 and 2 comply with CCITT recommendation
, 25 packet interface unit 3 having a function based on , 25, a LAN interface unit 4 having a function of connecting to a bus type LAN that handles variable length frames using the data crumb method, and the packet interface unit 3 and the LAN interface unit. 4 and a control section 5 for controlling the same. The control unit 5 includes a connection LAN address storage table 6 and a call state storage table 7 for managing call connections. The LAN interface section 4 is connected to a bus type LAN 8. A bus-type LAN 8 connected to the x, 25 gateway device 1 accommodates a LAN accommodation host 10,
, 25, a bus-type LAN 8 connected to the gateway device 2 accommodates a LAN accommodation host 12 . x, 25
The packet interface section 3 is connected to a public packet network.

Next, the operation will be explained.

Now, bus type LA connected to X,25 gateway device 1
Assume that the first call is a data transfer request from the LAN host 10 accommodated in N8 to the LAN host 11 accommodated in the bus type LAN 8 connected to the X,25 gateway device 2. In the x, 25 gateway device 1, the LAN interface section 4 sends the received data transfer request to the control section 5. The control unit 5 analyzes the data transfer request information and learns the address of the X, 25 gateway device 2 connected to the bus type LAN 8 as the transfer destination. Next, the control section 5 controls the X, 25 packet interface section 3.
From there, an address is assigned to the data packet and sent to the x,25 gateway device 2 via the public packet network 9. At the same time, the control unit 5 stores in the connected LAN address storage table 6 the address of the bus-type LAN 8 to be connected for each logical channel (hereinafter referred to as LC) for each X, 25 packet call. Next, the call status "connected" is written in the call status storage table 7 that stores the set call status. When the next data transfer request is received from the LAN accommodating host of the bus type LAN 8 connected to the Check whether it is already registered. If the data transfer request is of bus type L connected to X,25 gateway device 2,
If it is for the LAN accommodation post A, N8, it has already been registered, so it is sent as a public packet N49 as data transfer in progress for the corresponding LC call.

The X, 25 gateway device 2, which has received the data packet via the public packet network 9, uses the control unit 5 to obtain the address of the bus-type LAN 8 to which it is connected from C, and sends it to the bus-type LAN 8.
The received data is added to a data packet for the AN8 and sent out.

FIG. 2 is an explanatory diagram illustrating connection of a call via a public packet network.

X, 25 Bus type LA connected to gateway device 1
At N8, 10.1-2 and LA to LAN accommodation host 1
N accommodation terminal 14 is transferring data, and the bus type LA N8 connected to the X25 gateway device 2 is
It is assumed that N accommodating hosts 1 to 11 are transferring data, and in a bus type LAN 8 connected to X and 25 gateway devices] 6, a LAN accommodating host 13 and a LAN accommodating terminal] 5 are transferring data.

In this state, each X, 25 case 1 to way device 12.16
may connect the call to the destination X.25 gateway device. In other words, the connection with the LAN accommodation host 23 and the connection with the LAN accommodation terminal 45 are treated as one connection, and the connection with the LAN accommodation host 45 is treated as one connection.
To specify the connection between the N host and the LAN host,
It's all in a data packet. Like this X.

Since the 25 Gateway device does not manage calls between the LAN host and the LAN accommodating terminal, in the event of a failure such as data loss on the local LAN, processing cannot be performed on the 25 Gateway device and the LAN accommodating terminal is This will be done on the host and LAN accommodation terminal side.

〔Effect of the invention〕

As explained above, the present invention reduces the number of calls to be managed and simplifies call connection and call disconnection processes by collectively managing X and 25 packet calls to the same LAN in other areas. This has the effect of simplifying the device and being economically superior.

[Brief explanation of the drawing]

FIG. 1 is a block diagram of an embodiment of the present invention, FIG. 2 is an explanatory diagram illustrating connection of a call via a public packet network, and FIG.
The figure is an explanatory diagram illustrating conventional call connection. 1.2, 16.21...X425 gateway device, 3...x, 25 packet interface section, 4...LAN interface section, 5...
...Control unit, 6...Connection LAN address storage table, 7...Call status storage table, 8.22...
...Bus type LAN, 9...Public packet network,
10,11,12,13゜23...LAN accommodation host, 14,15.24...LAN accommodation terminal. Agent Patent Attorney Susumu Uchihara=297-

Claims (1)

[Claims] CCITT Recommendation X. a packet interface section having a function based on 25, a LAN interface section having a function of connecting to a bus-type LAN that handles variable length frames using a datagram method, and a LAN interface section that controls the packet interface section and the LAN interface section and that controls the LAN interface section from itself. Receives data transfer requests from the connected local LAN to other local LANs connected via the public packet network, sets up calls, and collectively manages multiple call settings for the same other local LAN. The X. 25 gateway device.