JPS6313547A - Packet exchange - Google Patents

Abstract

PURPOSE:To input PVC setting and PVC release requests from a packet terminal by predetermining a format of a packet sending a PVC (Permanent virtual circuit) setting and PVC release request signal between a packet exchange and the packet terminal. CONSTITUTION:A PVC setting request code or a PVC release request code is given to the head of a facility column. When a PVC where a packet terminal 5a is set as a caller terminal and a packet terminal 5b is set as a called terminal, the packet terminal equipment 5a sends the packet having the format to a packet exchange 1a. The packet exchange 1a detects the PVC setting request code to assure a call control memory 2a with respect to the said logic channel, in which required information such as an opposite terminal address and an opposite terminal logic channel is stored. Further, a packet A exclusive for inter-network is sent. Thus, the PVC communication using the packet terminal 5a as the caller terminal and using the packet terminal 5b as the called terminal is attained.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a packet switch that constitutes a packet switch network and accommodates packet-type terminals. In a packet-switched system that uses a packet-switched network, the exchange receives information sent from a calling terminal, stores it in memory, transfers it at high speed within the network, and sends it to the called terminal.

In addition, in the connection class between the originating terminal and the terminating terminal in the packet switching method, the communication partner is not fixed, and the communication partner can be selected and communicated with an arbitrary partner (virtual party selection class).
l call VC) and fixed party class (permanent VC) in which the communication party is always fixed to one specific party.
(hereinafter abbreviated as PVC). This invention relates specifically to PVC.

[Conventional technology]

FIG. 3 is a block diagram showing a conventional device, and in the figure (
Ia), (lb), and (In) are packet switches, respectively; (2a), (2b), (2c), and (2d) are call control memories configured for each logical channel; and (3a) are respectively call control memories configured for each logical channel.
), (3b) are trunk lines that connect packet switches to each other,
(4a) and (4b) are connection lines connecting the terminal and the exchange, respectively, and (5a).

(5b) is a packet type terminal (hereinafter abbreviated as packet terminal), and (6a) and (6b) are operator consoles of packet exchangers (la) and (lb), respectively.

The packet terminals (5a) and (5b) shown in FIG. A plurality of general terminals (that is, non-packet terminals) that do not have an assembly/disassembly function are also connected to the packet switch via the packet assembly/disassembly function section, but the explanation of this invention will be omitted except for the parts that are essential to the explanation of this invention. Not shown in Figure 3.

In the conventional device shown in FIG. 3, a PVC setting request for setting up a PVC from one packet terminal to another packet terminal is transmitted to the administrator of the packet switching network in a document or written form, and according to this setting request, the associated packets are This was done by the switch operator from the operator console of the packet switch. For example, a packet switch (1a
), the calling terminal is (5a) and the receiving terminal is (5b
) to try to set up a PVC with terminal (5a)
[i.e., the source address, hereinafter abbreviated as SA], the address of the terminal (5b) (i.e., the destination address, hereinafter abbreviated as DA), the logical channel number (the logical channel number from the terminal (5a) to the terminal (5b) (number assigned to a specific transmission path) etc. from the operator console (6a). Assuming that the call control memory for this logical channel is (2a), the information input from the operator console (6a) is the call control memo! J (2a), and at the same time, it is packetized into an intra-network dedicated packet (indicated by A in FIG. 3) and sent to the packet switch (1b) accommodating the packet terminal (5b).

If the call control memory for the logical channel of the number in the packet switch (1b) is (2c),
The packet switch (1b) stores the contents of packet A in the call control memory (2c). In addition, call control memo IJ (2c
) The information necessary to notify the packet switch (1a) that the storage in
Return it to a). Through the above processing, the packet switch (
la) and (lb) have recognized the PVC between the packet terminals (5a) and (5b), and the packet switch (1a) has recognized the PVC between the packet terminals (5a) and (5b).
) notifies the operator console (6a) of this fact. Thereafter, the packet terminals (5a) and (5b) can communicate using PVC. That is, when a packet with the packet terminal (5a) as the originating terminal and the packet terminal (5b) as the receiving terminal is input from the packet terminal (5a) to the packet switch (1a) via the connection line (4a), the packet switch (la) is the call control memo corresponding to the case where the packet terminal (5a) becomes the originating terminal.) The contents of (2a) are checked and the packet is processed by PVC according to the contents stored in memo IJ (2a). to transmit.

When dividing the PVC between the packet terminals (5a) and (5b) by M, a similar method as when setting the PVC is used.
By inputting from the operator console (6a), invalidating the contents of the call control memo IJ (2a), and invalidating the contents of the control memo 9 (2c) by sending the network-specific packet A, the packet terminal The PVC between (5a) and (5b) was removed.

[Problem that the invention seeks to solve]

With conventional packet switching equipment, when setting up a PVC or canceling a set PVC, the necessary information must be entered from the operator console, whereas the packet terminal itself is not involved in this process. Ta.

However, since the terminal can most accurately predict temporal changes in the packet communication situation (communication volume for each partner terminal, etc.) in which the own terminal is the originating terminal, the terminal can communicate with any other terminal according to this prediction. It is desired to be able to set PVCs or cancel already set PVCs freely and at an appropriate timing.

This invention was made in view of these demands, and the purpose is to provide a packet switching device that allows a packet terminal serving as a transmitting terminal to set and release a PVC to a terminal arbitrarily selected by a receiving terminal at an arbitrary timer. shall be.

[Means for solving problems]

In the packet switch of the present invention, the format of the packet that sends the PVC setting and PVC cancellation request signals is determined in advance between the packet switch and the packet terminal to be accommodated, and the PV
We decided to input the C setting and PVC cancellation request from the packet terminal to the packet switch.

[Effect]

Since the packet switch can receive requests for PVC setup and cancellation directly from the packet terminals, it is not necessary to set up and cancel packets through input from the operator console of the packet switch. Furthermore, in order to receive PVC services in conventional devices, packet terminal users were required to make a contract to that effect when joining a packet switching network, but with the device of the present invention, such a contract is no longer necessary.

〔Example〕

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 is a block diagram showing an embodiment of the present invention, in which the same reference numerals as in FIG. 3 indicate the same or corresponding parts, and the operator console (6a) shown in FIG. 3.

(6b) is not shown in FIG. 1 because it is no longer relevant to this invention. FIG. 2 is a format diagram showing an example of the format of a packet sent from the packet terminal of the present invention together with data necessary for PVC setting, such as a request signal requesting PVC setting and PVC cancellation to the packet switch. Any format can be used as long as it is agreed upon in advance between the packet terminal and the packet switch. This is an example used as a format for a PVC release request. As shown in Figure 2, the PVC setting request code or PVC is displayed at the beginning of the facility column.
A cancellation request code is entered. The bit patterns of these codes are determined in advance between the packet terminal and the packet switch.

In Figure 2, GFI is a general format identifier;
LCGN is logical channel group number, LCN is logical channel number, CLL is calling DTE (data terminal equipment)
Address length, CDL is called DTE address length, DA is called DTE address, SA is calling DTE address, P
L is the facility length, and the bit pattern of the third octet indicates that it is a facility request packet. Also, in the example shown in the figure, both DA and SA are 7 digits, 16.
Since it is expressed as a base number and stored in a 4-byte area (corresponding to an 8-digit hexadecimal number), the lowest 4 bits are r 0000 J as shown in the figure.

For example, when a packet terminal (5a) sets up a PVC in which its own terminal is the originating terminal and the packet terminal (5b) is the receiving terminal, the packet terminal (5a) sends a packet in the format shown in FIG. 2 to the packet switch (1a). Send to. The packet switch (LA) detects the PVC setup request code and stores the call control memory (LA) regarding the corresponding logical channel.
Secure the memory (2a)) and enter the other party's terminal address (
DA), stores necessary information such as the logical channel of the other terminal. First, the intra-network dedicated packet A is sent out in the same way as explained with reference to FIG. The subsequent operation is similar to that of the conventional device, but in the case of FIG. 1, the intra-network exclusive packet B becomes a facility confirmation packet.

In this way, the packet terminal (5a) is set as a transmitting terminal,
PVC communication with the packet terminal (5b) as the receiving terminal becomes possible.

When attempting to release a PVC that has already been set, the packet terminal (5a) sends a packet whose beginning in the facility column in FIG. 2 is a PVC release request code to the packet switch (1a), and the packet switch (1a) In response to this, it invalidates the contents of the call control memory (2a), and sends an intra-network dedicated packet A corresponding to the packet release request to the packet switch (1b).
b) thereby invalidates the contents of the call control memo IJ (2e) and sends an intra-network dedicated packet B, which is a facility confirmation packet, to the packet switch (1a).

In the above example, a facility request packet is used for the PVC setting and PVC # removal requests, but the packet terminal is not limited to the facility request packet, and arrangements may be made to use other packets between the packet terminal and the packet switch. For example, the format of the calling packet differs from the format of the facility request packet only in the bit slam in the third octet, so the PVC setting request code or PVC release request code is inserted at the beginning of the 7 ability column of the calling packet. It can be a packet for PVC setup and release.

〔Effect of the invention〕

As described above, according to the present invention, a new code is negotiated between the packet switch and the packet terminal, and it becomes possible to directly receive PVC setting request and cancellation request from the packet terminal, so that the packet switch operator This eliminates the need for PVC setting and cancellation processing from the console, and also eliminates the need for packet terminal users to perform contract procedures regarding PVC settings.

[Brief explanation of drawings]

FIG. 1 is a block diagram showing an embodiment of the present invention, FIG. 2 is a format diagram showing an example of the format of a PVC setting (cancellation) request packet sent from a packet terminal to a packet switch according to the present invention, and FIG. is a block diagram showing a conventional device. (la), (lb), (in) --- Packet switch, (2a), (2b), (2c), (2d)
) ----- Call control memory, (5a), (5
b) --- Packet format terminals, A, B, etc.
・Each packet is exclusive to the network. Note that the same reference numerals in each figure indicate the same or corresponding parts.

Claims (1)

[Scope of Claims] In a packet switch that accommodates packet terminals, a PVC (penetration network) is used between a calling terminal and an arbitrary receiving terminal.
A packet terminal that wishes to set up a PVC setting request code and information necessary for PVC setting is sent to a packet in a format predetermined with the packet switch to which the terminal belongs (hereinafter referred to as the originating switch). means for transmitting the received PVC setting request packet to the originating exchange; the originating exchange that receives the PVC configuration request packet stores the information necessary for PVC in a call control memory, and sends it to the originating exchange as a PVC configuration request packet; A means for sending a PVC setting intra-network dedicated packet containing information necessary for PVC setting to the terminating side exchange (referred to as a terminating side exchange); A means for storing in memory, a packet terminal that attempts to release a PVC for which the terminal is set as an originating terminal sends a PVC release request code and a PVC release request code necessary for PVC release to a packet in a format predetermined with the originating exchange. The originating exchange receives the PVC release request packet, invalidates the contents of the call control memory corresponding to the PVC, and sends the PVC release request packet to the terminating exchange. means for transmitting a PVC cancellation intra-network dedicated packet containing information necessary for cancellation; means for the destination exchange receiving the PVC cancellation intra-network dedicated packet to invalidate the contents of the call control memory corresponding to the PVC; A packet switching device characterized by being equipped with.