JPH01293046A - Packet protocol communication device - Google Patents

Abstract

PURPOSE:To easily switch systems when a packet protocol converter becomes detective by providing a multi-address communication means which delivers and receives call controlling packets between terminal equipment and plural packet protocol converters after putting the call controlling packets on frames of a multi-address fram in addition to a route connecting means. CONSTITUTION:This packet protocol communication device is constituted in such a way that a multi-address frame transmitting section 8 and multi-address frame receiving sections 9 are respectively provided to terminal equipment 3 connected with an LAN 2 and the packet protocol converters 4, and MAC (Media Access Control) frames of a multi-address form are used for CR(Call Request) packets which are partner connection controlling originating call (call controlling) packets for connecting communication partners. When the MAC frames of s multi-address form are adapted to the CR packets in such way, connection switching to the packet protocol converters 4 of a double-system constitution can be realized extremely easily with a simple constitution.

Description

[Detailed Description of the Invention] [Field of Industrial Application] The present invention relates to a packet protocol communication device equipped with a packet protocol conversion device that connects a local area network having a packet protocol and a wide area packet switching network. .

[Conventional technology]

FIG. 4 is a block diagram showing a state in which a conventional packet protocol conversion device is connected to a wide area packet switching network (hereinafter referred to as a packet network). In the figure, 1 is a packet network, 2 is a local area network
(hereinafter abbreviated as LAN), 3 is a packet terminal device connected to LAN2 (hereinafter abbreviated as PT), 4 is LAN
It is a packet protocol conversion device that connects C 2 and packet network I, and uses C as the communication protocol of packet network L.
CITT Recommendation x. The standard $25 packet protocol is applied. As the communication protocol for LAN2, the x.25 packet protocol is similarly applied to construct a so-called connection-oriented LAN.

Figure 5 shows the functions of the protocol conversion device 4.
Shown in reference model format. The network layer is the x.25 packet protocol for both LAN2 and packet network 1, and the data link layer is IS 08802 for LAN2.
．． 2L L C (Logical Link Cont.
rol), and HDLC (High Level Data Link Control) in the packet network 1. The physical layer is IS in LAN2.
Media Ac (Media Ac) such as 08802.3
cessControl), the packet 111 is CCITTv, 24 or X, 21, etc. M.E.
The DIA corresponds to the physical layer of the LAN 2 or the packet network 1, and is a cable type.

The functional operation of the bucket conversion device 4 is as follows. Communication messages transmitted over LANZ are called LAN.
Packet protocol converter 4 with protocol format
When the packet protocol converter 4 arrives at L A
Converts the packet format of the NX, 25 packet protocol to the bucket l-11X, 25 bucket format. Here, the target of packet format conversion is address conversion, and conversion of bucket type, data, etc. is not performed.

Thereafter, the communication message is transmitted to the packet network 1 according to the packet tmX, 25 packet format. On the other hand, the conversion from the packet network 1 to the LAN 2 is performed by a completely reverse process to that described above.

Next, the address conversion method of the packet protocol conversion device 4 will be explained. FIG. 6 shows an example of a packet communication sequence. Here, PT3 connected to LAN2 outputs packet y4D CE from packet protocol converter 4.
(Data Communication Circuit
An example of communicating with ting Equipment) 20 will be described.

CR (Ca
I I Request L) For packet IO, own DT
E (Data Terminal Equipment
) address, the D i' L near address of the other party (in this case, an address indicating a terminal device connected to the packet network), and the own logical channel to be selected for this communication. The packet protocol conversion device 4 checks whether the received CR bucket 1-10 has a registered DTE address based on the originating and receiving DTE address table, and if it is registered (this means that the unregistered packet is (This is to prevent the packet network from being charged), converts its own DTE address to the packet network joining DTE address of the packet protocol conversion device 4, and transmits the CR bucket) 11 to the packet network I. packet network DC
From E20, CC (Cal
l Confirm) When the packet 12 arrives, the packet protocol conversion device 4 compares the packet logical channel of the CC packet 12 with that of the previously transmitted CR packet 11, and if it is acceptable, transfers the destination DTE address to P. It converts to the LAN joining DTE address of T3 and sends CC buckets 1-13 to LAN2.

When the PT3 receives the CC packet 13, a network connection is established by establishing a logical channel. Thereafter, DT (Data) packet 14.15 and RR (Receive Realfy) packet 16
．． 17, data transfer is performed.

[Problem to be solved by the invention]

By the way, in order to install a plurality of packet protocol converters having the above-mentioned configuration and configure a dual system function that avoids failure of communication due to failure of one packet protocol converter, it is necessary to set up a LAN. D of connected PT
It is necessary to perform the functional operation of tabulating and address mapping TE addresses to multiple subscriber DTE addresses for each packet logical channel on a subscriber communication line basis. This is the packet network joining DTIE,
This is because one address is set for each subscriber communication line. Therefore, in conventional packet protocol communication equipment, even if one of the multiple packet protocol converters installed fails, switching the system becomes complicated, and the configuration to realize this switching also becomes complicated. There was a problem.

This invention was made to solve the above-mentioned problems, and it is possible to easily switch systems when one of the plurality of packet protocol converters installed breaks down. Packet Pro l-:!, which can be realized with a standard configuration and reduce costs. The purpose is to provide a wireless communication device.

[Means to solve the problem]

The packet protocol communication device according to the present invention installs a plurality of packet protocol conversion devices, and each converts the local area network joining address of the terminal device according to the call control packet I of the terminal device connected to the local area network. route connecting means for converting the packet protocol into a wide area packet switching network joining address of the packet protocol conversion device and connecting the logical channel of the terminal device to the logical channel of the communication line of the wide area packet switching network; The system is equipped with a broadcast communication means for transmitting and receiving call control packets in a broadcast format frame between a plurality of packet protocol converters and a plurality of packet protocol converters.

[Effect]

In this invention, a regular system among a plurality of installed packet protocol converters uses broadcast communication means to transmit call control packets in a broadcast format originating from a terminal device connected to a low power area network. In response to this, the path connecting means connects the logical channel of the terminal device to the logical channel of the communication line of the wide area packet switching network. If the active side fails, the standby packet protocol converter becomes operational, starts receiving call control packets in broadcast format, and operates in the same manner as described above.

〔Example〕

An embodiment of the present invention will be described below with reference to the drawings. 1st
The figure is a block diagram showing each functional module of a packet protocol communication device according to an embodiment of the present invention.

In FIG. 1, 3 is a packet terminal device connected to LAN2! (PT) , 4 is a packet protocol converter connected to the LAN 2 and the bucket machine Nfll, and although one unit is shown for each in the figure, a plurality of units are installed for each. 5 is a LAN connection interface unit corresponding to the data link layer and physical layer in FIG. 5, and is in charge of the LLC and MΔC protocols of the LAN protocol;
The functions of the PT3 and the packet protocol converter 4 are the same. 6 is the same (a packet network connection interface unit corresponding to the data link layer and the physical layer, and is in charge of HDLC and physical layer protocols with the packet network l. 7 is the D corresponding to the network layer)
The TE address converter converts the packet network joining DTE address of the packet protocol conversion device 4 and the LAN joining DTE address of the PT3. 8 is a broadcast frame transmitter provided in the PT3, which sends broadcast format frames to the LAN.
When sending the data to the LAN connection interface section 5, the data is sent to the LAN connection interface section 5. Reference numeral 9 denotes a broadcast frame detecting section provided in the packet protocol converting device 4, which analyzes the same amount code format frame received from the LAN connection interface section 5.

Here, the LAN connection interface section 5. Packet network connection interface section 6 and DTE address conversion section 7
corresponds to a route connecting means, and the broadcast frame transmitter 8 and the broadcast frame detector 9 correspond to a broadcast communication means.

FIG. 2 is a block diagram for explaining the data transfer operation of this embodiment. In Figure 2, 3a and 3b are LA
N-connected PT, LAN joining DTE address “A n
, II B II respectively. Reference numerals 41 and 42 denote packet protocol converters, each having a broadcast address ``M'' as the LAN joining DTE address, and a packet network joining DTE address ``C''.

Each has a “D”. PT3a, 3b are packet w
When communicating with a DTE existing in 41, if this DTE address is s P l'', II P +1 is the destination D
TE address, address “A1 or B” as source DTE
address, set its own logical channel, put these C and R packets on a broadcast format MAC frame of the MAC protocol function on the LAN protocol, and send the destination address using broadcast address "M". do. Broadcast format MA specified in the l5O8802,3 standard
The C frame sets the sending start bit of the MAC address field part to 1'', and when the sending start bit of the MAC address field part is "0", it becomes a normal individual address.

FIG. 3 is a transfer sequence diagram showing the data transfer operation of this embodiment. The coaxial frame transmitter 8 transmits the CR packet (
Destination DTE address “P”.

The own DTE address "A") 30 is sent to a customer using a MAC frame with broadcast address "M1". Both packet protocol converters 41 and 42 use the MAC frame with broadcast address "M".
Can receive frames. A dual system functional configuration generally includes a regular system and a standby system, and here, the packet protocol conversion device 41 is the regular system and 42 is the standby system.

The standby system starts operating immediately when the regular system suffers an abnormal failure, but becomes inactive and on standby when the regular system is repaired and becomes normal. The switching means that detects an abnormality in the regular system and puts the standby system into an operating state may be automatic switching using a mutual status monitoring method, or manual switching.

The OR packet received by the broadcast frame detection unit 9 as part of the LAN connection connection interface of the regular packet protocol conversion device 41 is converted into the packet network by the DTE address conversion unit 7 from the own DTE address to the LAN joining DTE address “A”. Convert it to the subscribed DTE address “C” and send it to the packet network 1 via the packet network connection interface unit 6.
R packet (destination DTE address "P', own DTE
address 1C") 31. From packet w41 to CC packet (destination D T E "7' address "C"
.

When the own DTE address 1P''') 32 arrives, the destination DTE address is set to the packet network joining DTE address ``C''.
to the LAN joining DTE address "A", and transmits a CC packet (destination DTE address "A", own DTE address "P") 33 onto the LAN 2 toward the PT 3a. Similar network connection settings occur when PTab sends a CR packet.

Next, a case where the packet protocol conversion device 41 fails will be explained.

1) T3a sends a CR packet (
Destination DTE address “P”, own DTE address “A”
) 30, the packet protocol converter 42
is in operation, so here we will use this broadcast format M.
The packet protocol converter 42 receives the AC frame. The communication operations after address conversion of the CR packet (destination DTE address @P”, own DTE address “D”) 31 transmitted to the packet network 1 are the same as those of the protocol conversion device 41, and the network connection settings are Even if the packet protocol conversion device is switched, the PT3a does not need to change parameters, addresses, etc. at all.

As described above, the packet protocol communication device of this embodiment includes the terminal device 3 connected to the LAN 2 equipped with the broadcast frame transmitter 8, the packet protocol converter 4 equipped with the broadcast frame receiver 9, and performs communication. A broadcast format MAC frame is used in a CR packet, which is a call control packet for connecting to a partner.

By applying the broadcast format MAC frame to the CR packet in this manner, connection switching with the packet protocol conversion device 4 having a dual system configuration can be realized with a simple configuration and extremely easily.

Note that in the above embodiment, the broadcast format MAC frame is uniquely described, but the broadcast format includes a broadcast address format and a group broadcast address format, which are defined in international standards such as 15O8802, 3, etc. This can be achieved using either of these formats.

〔Effect of the invention〕

As described above, according to the present invention, a plurality of packet protocol conversion devices are installed, and each device converts the local area network joining address of the terminal device to the local area network according to the call control packet of the terminal device connected to the local area network. route connecting means for converting into a wide area packet switching network joining address of the device and connecting the logical channel of the terminal device to the logical channel of the communication line of the wide area packet switching network; Since it is equipped with a broadcast communication means that sends and receives call control packets in broadcast format frames between devices, it is possible to realize a duplex system that allows easy system switching in the event of a packet protocol conversion device failure. Since it can be realized by the configuration, it has the effect of reducing costs.

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing the configuration of a packet protocol communication device according to an embodiment of the present invention, FIG. 2 is a block diagram showing the system configuration for explaining the packet protocol communication device of this embodiment, and FIG. is a sequence diagram for explaining the operation of this embodiment, FIG. 4 is a block diagram showing a state in which a conventional packet protocol conversion device is connected to a packet switching network, and FIG. 5 is a diagram of the packet protocol conversion device. FIG. 6 is a sequence diagram for explaining the operation of a conventional packet protocol communication device. l...Packet network (wide area packet switching network)
, 2...LAN (local area network),
3.3a, 3b...PT (packet terminal device), 4
, 41.42...Packet protocol conversion device, 5.
...LAN connection interface section (route connection means), 6
... Packet network connection interface section (route connection means), 7... DTE address conversion section (route connection means),
8...Broadcast frame transmission unit (broadcast communication means), 9...
-Broadcast frame detection unit (broadcast communication means). In addition, in the figures, the same reference numerals indicate the same or equivalent parts. Agent: Masuo Oiwa (and 2 others) Punishment P. 50 LAN Bug/Ten Signs Procedure Amendment (Method) % Formula %: 1. Indication of the incident Patent Application No. 123076/1988 3.
Person making the amendment Representative Moriya Shiki 4, Agent 5 Date of amendment order August 30, 1988G Number of inventions increased by amendment 7, column of drawings subject to amendment. a Contents of amendment (1) The drawing and all figures will be amended as shown in the attached sheet. Above Figure 3

Claims (1)

[Claims] In a packet protocol communication device equipped with a packet protocol conversion device that connects a local area network having a packet protocol and a wide area packet switching network, a plurality of the packet protocol conversion devices are installed and each is connected to the local area network. converting the local area network joining address of the terminal device into the wide area packet switching network joining address of the packet protocol conversion device according to the call control packet of the terminal device, and converting the logical channel of the terminal device into a logical channel of the communication line of the wide area packet switching network. Packet protocol communication characterized by comprising a route connection means for making a route connection, and a broadcast communication means for transmitting and receiving a call control packet in a broadcast format frame between the terminal device and a plurality of packet protocol conversion devices. Device.