JPH04154327A - Automatic bandwidth contention method in TDM equipment - Google Patents

Abstract

PURPOSE:To effectively utilize a band by constituting this system so that all nodes on a network allocate dynamically the band independently by a trigger from a low-order device. CONSTITUTION:A trigger from a data terminal 1 is recognized by a line set 2, and it is informed to a device control part 4 that it is necessary to obtain a band. The device control part 4 which receives a request to obtain the band searches a network connection interface 7 connected to a ground node from a circuit table 5. Also, the device control part 4 confirms whether a free band in present on its network connection interface 3 or not by a network connection table 6, and issues a band scrambling command to the ground node, in the case the band is present thereon. The ground node which receives the band scrambling command enters into a connection sequence to a terminal to be connected.

Description

[Detailed Description of the Invention] [Summary] Regarding the method of allocating TDM bands in TDM (time division multiplexing) equipment, by dynamically allocating TDM bands, which were conventionally fixed, the efficiency of the line can be dramatically increased. For the purpose of measuring usage, T is used to connect the network between the calling node and the destination node.
In the DM device, the calling node includes a calling data terminal or PBX device, a line set connected to each data terminal or PBX device, a network connection interface that constitutes a network with the destination node, and the line set. and a network connection interface, and the device control unit is provided with a line table for storing line connection information and a network connection table, and is equipped with a line table for storing line connection information and a network connection table, and is used to control the connection from the calling data terminal or PBX device. The connected line set recognizes the trigger and notifies the equipment control unit of the necessity of bandwidth acquisition, and the equipment control unit that receives the bandwidth acquisition request stores the network connection interface connected to the destination node in the line table. It is configured to search based on priority and issue a bandwidth contention command to the ground node.

[Industrial application field]

The present invention provides TDM (time division multiplexing) in a TDM (time division multiplex) device.
Bandwidth allocation is related to the method.

A time division multiplexing device sends a time division multiplexed signal from a calling side to a receiving side time division multiplexing device via a network, and connects a line from a data terminal or PBX device on the sending side to a data terminal or PBX device on the receiving side. used. This time-division multiplexed signal consists of a high-speed signal with one band of 64 Kbits, and this band signal is assigned to each data terminal or PBX device, and data or audio signals are superimposed and transmitted using a dedicated band signal.

In recent years, with the expansion of the transmission range of time division multiplexing equipment, when connecting from the originating side to the terminating side, a relay station is installed in the middle to make effective use of the network, and the selection of the line to connect has become a priority. Now, the route to take for connection is determined each time by detecting the availability of the line.

FIG. 5 shows an example of a system configuration of a time division multiplexer. In the figure, 11 is a calling node, 12 is a relay node, 13 is a called node, and each node is a network connection interface 14.
is provided on the network side, and the data terminals 15 joining each node are connected to the time division multiplexing device by respective dedicated line sets 16. Therefore, which network connection interface 14 is selected by the line set 16 connected to the time division multiplexer is controlled by the time division multiplexer each time. Whether the calling node 11 is directly connected to the called node 13 is selected depending on the line condition at that time.

When transmitting a time division multiplexed signal to the line of this selected network, allocation of the TDM band to be transmitted has become extremely important in terms of network configuration.

[Conventional technology]

The conventional TDM band allocation method is shown in FIG. The figure shows the configuration of a TDM signal, one band consists of a 64Kbit high-speed band, and one terminal has four bands, that is, 6
Allocate a band of 4KbitX 4 = 256Kbit,
Bands of a+b+c+d=f are allocated to the TDM in a predetermined order by line setting in advance, and a fixed amount of band for each terminal is allocated for each connected line set, that is, for each circuit.

Therefore, even when voice communication is not occurring or actual data is not being generated (when the data terminal is not in use or the power is turned off), the bandwidth allocated to the terminal is fixedly secured. This results in a waste of bandwidth.

[Problem to be solved by the invention]

With the conventional TDM band allocation method, the band used by each terminal is fixed, so when the network expands,
There was a problem that the band could not be used effectively.

An object of the present invention is to achieve dramatically more effective use of lines by dynamically allocating TDM bands, which were conventionally fixed.

[Means to solve the problem]

The present invention changes the method for dynamically allocating bandwidth acquisition based on a trigger (activation) from a data terminal. FIG. 1 shows the principle configuration diagram of the present invention. In the figure, 1 is the calling data terminal or PBX device, 2 is the data terminal or P
A line set connected to each BX device, 3 a network connection interface that constitutes a network with the destination node, 4
indicates a device control unit that controls the connection between the line set and the network connection interface.

The device control unit 4 is provided with a line table 5 for storing line connection information and a network connection table 6, so that the connected line set 2 recognizes a trigger from a calling data terminal or PBX device l, and The equipment control unit 4 is notified of the need for bandwidth acquisition, and upon receiving the request for bandwidth acquisition, the equipment control unit 4 searches for a network connection interface 7 connected to the destination node based on the priority of the line table, and connects the network connection interface 7 to the destination node. Configure it to issue a bandwidth contention command to Note that 8 is a device control unit of the ground node, 9 is a line set, and IO is a data terminal.

[Effect]

Specifically, it captures the point in time when a user uses a data terminal (for example, in the case of data, the power of the data terminal is turned on, or in the case of voice, the trunk line goes off-hook) and uses that as a trigger. to secure bandwidth. This is a method of expanding the band utilization ratio, which was conventionally 1:1, to n:1 and effectively utilizing the band.

A sequence diagram of the present invention is shown in FIG.

(2) Line design has been completed in advance, and line connection information, that is, the connection relationship between line sets and network connection interfaces, is stored in the line table 5 and network connection table 6 of the device control unit 4.

(2) Each line has a priority, and this information is also stored in the line table 5 of the device control section 4.

(2) The line set 2 recognizes the trigger from the data terminal 1 and notifies the device control unit 4 that band acquisition is necessary.

(2) Upon receiving the request for band acquisition, the device control unit 4 searches the line table 5 for the network connection interface 7 connected to the destination node.

(2) The device control unit 4 further checks whether there is free bandwidth on the network connection interface 3 using the network connection table 6, and if there is free bandwidth, issues a bandwidth contention command to the destination node.

■ The destination node that receives the bandwidth contention command enters a connection sequence for the terminal to be connected.

(2) Furthermore, a connection enable signal (ACK command) is sent back to the calling node, and the calling node enters a connection sequence to the calling terminal 1.

(2) In (2) above, if there is no free bandwidth, a busy signal (NAK command) is returned to the calling node, and the calling node notifies the bandwidth acquisition requesting terminal 1 of the busy state.

〔Example〕

FIG. 3 shows an example of a sequence diagram of a TDM device consisting of a calling node, a relay node, and a called node. Further, FIG. 4 shows an example of tables provided in the device control section. In FIG. 4, (a) shows an example of a line table, (b) a network connection table, (C) a bandwidth contention command, and (d) a bandwidth contention bump-out command.

The present invention will be explained in detail with reference to FIGS. 3 and 4.

(Prerequisite) In line design, set the line table and network connection table in the device control unit.

(a) The line table includes the circuit floor, priority, bandwidth,
It consists of items such as calling node ID, called node ID, line status, etc., and the bandwidth and priority of the circuit to be triggered, the ID numbers of the calling node and called node are set in advance, and the line is being used. Set the status of whether or not there is “l” or “0”
``This is expressed in many ways.

(b) The network connection table contains the ID of the network connection interface.
The time/slot usage status of the band for each ID number is represented by either "l" or "0".

(C) Bandwidth contention command consists of items such as node ID, circuit storm, priority, band, address, etc., and also displays node IDs of adjacent nodes on the calling side and the called side.

(d) Bandwidth contention bumpout command is a so-called humpout command in which when a higher priority circuit floor enters, a lower priority one is kicked out. A circuit block is specified.

(Sequence) The case where there is no bump out and the case where there is bump out will be explained separately.

-When there is no bump-out- ■' LS (LS) trigger from DTE (data terminal)
line set) and notifies the device control unit that bandwidth acquisition is necessary.

(2) Upon receiving the request for band acquisition, the device control unit searches the line table (a) for an NP (network connection interface) connected to the destination node.

(2)"The device control unit further checks whether there is free bandwidth on the NP table (b). If there is free bandwidth, it issues a bandwidth contention command (C) to the destination node.

⑛The relay node that receives the bandwidth contention command similarly checks the free status of the connected NP. The command is transferred to the adjacent relay node using the same procedure as the calling node.

■'If there is no free band, a NAK command is returned to the calling node. The calling node notifies the bandwidth acquisition requesting terminal of the busy state.

■'The called node that receives the bandwidth contention command enters a connection sequence for the terminal to be connected.

■'Furthermore, send an ACK command back to the calling node,
The calling node enters a connection sequence to the calling terminal.

When there is a bump-out - (1) The LS recognizes the trigger from the DTE and notifies the device control unit that band acquisition is necessary.

(2) Upon receiving the request for band acquisition, the device control unit searches the line table (a) for an NP connected to the destination node.

The device control unit C' further checks whether there is any free space for the band on the NP child table b). If there is no bandwidth, search the line table (a) for a line with a low priority that is already in use and connected to the same called node.

0' If there is no corresponding line, notify the terminal of the busy state.

0' If there is a line with a low priority, a band contention bumpout command (d) is issued to the adjacent node with its Ckt # added.

The relay node that received the 0゛ command confirms the bump-out Ckt and issues the same command to the called node.

The called node that receives the 0° band contention bumpout command (d) performs a line connection operation.

[Phase]' Furthermore, an ACK is sent back to the calling node. The relay node and the calling node perform line connection processing.

〔Effect of the invention〕

According to the present invention, all nodes on the network can autonomously allocate bandwidth dynamically based on requests from lower-level devices, expanding the bandwidth utilization rate from l:l to n:1,
It becomes possible to use the band effectively.

[Brief explanation of drawings]

Figure 1 is a diagram of the principle configuration of the present invention, Figure 2 is a sequence diagram of the present invention, Figure 3 is a sequence diagram of an embodiment, Figure 4 is an embodiment of tables, and Figure 5 is a time division multiplexing device system. A configuration example, FIG. 6, shows a conventional band allocation method. In the figure, l, 10.15 is a data terminal or PBX
Equipment, 2, 9.16 is a line set, 3. 7.14 is a network connection interface, 4 and 8 are device control units, 5 is a line table, 6 is a network connection table, 11 is a calling node, 12 is a relay node, and 13 is a called node.

Claims (1)

[Claims] T connecting a network between a calling node and a destination node
In a DM (time division multiplexing) device, a calling node connects a calling data terminal or PBX device (1), a line set (2) connected to each data terminal or PBX device, and a network with a destination node. It has a network connection interface (3) that constitutes the line set and a device control unit (4) that controls the connection between the line set and the network connection interface, and the device control unit (4) has a line that stores line connection information. A table (5) and a network connection table (6) are provided, and the connected line set (2) recognizes the trigger from the calling data terminal or PBX device (1) and sends the trigger to the device control unit (4). The device control unit (4), which has received the request for bandwidth acquisition, transfers the network connection interface (3) connected to the destination node to the line table (5).
An automatic bandwidth contention method in a TDM device, which is characterized in that a bandwidth contention command is issued to a ground node based on priority.