JPH04241530A - Terminal switching device - Google Patents

Abstract

PURPOSE:To automatically switch a terminal equipment corresponding to a fault by providing a circuit to monitor the control signal of the terminal equipment in a switch card for switching and detecting abnormality at a monitor channel. CONSTITUTION:In the case of a fault on a terminal interface card 9 or an active bus 71 because of the fault of an active high-speed digital line 12 or a TDM 10, etc., the fault is transmitted through a terminal interface card 91 for monitor channel to a remote card 45. Thus, a monitor data detection circuit 47 simultaneously analyzes the fault bus or the state information of a relay 6 of each switch card 5 between the own station and the counter station as well, and a switching instruction is transmitted from a switch control part 43 to all the switch cards 5. Then, the remote control card itself is automatically switched as well, and data for real operation from respective terminal equipments 15 are inputted through a spare bus 8 to a terminal interface 9 of a spare TDM 11, multiplexed and developed from a spare high-speed digital line 13 to an existent spare system network having no fault.

Description

[Detailed description of the invention]

0001

[Industrial Application Field] This invention enables switching of a plurality of terminal devices connected to a redundant network.
The present invention relates to a terminal switching device that backs up data communications.

0002

2. Description of the Related Art FIG. 2 is a block diagram showing the configuration of a conventional terminal switching device called, for example, a Melmax switcher. 3 is a network monitoring device that visually displays a failure part; 3 is a switching state monitoring device that monitors the switching state of a switch; 4 is a terminal switching device; 41 is a switching state display unit that displays the switching state of the terminal switching device 4. , 42 in the terminal switching device 4,
43 is a switch control unit that controls the terminal switching relay 6 of the terminal switching device 4; 44 is a display control unit that displays the switching status of the active and standby switches (relays); 5 is a switch card mounted and added to each terminal device 15 in the terminal switching device 4; 6 is a relay on the switch card 5;
7 is the terminal switching device 4 and the current time division multiplexing device 10.
8 is a working route (line) set between the terminal interface cards 9 in the TDM (hereinafter referred to as TDM), and 8 is a backup route set between the terminal switching device 4 and the terminal interface card 9 in the spare TDM 11. (line) and 9 are terminal interface cards in the active and backup TDMs 10 and 11. Further, 10 is a working TDM, 11 is a backup TDM, 12 is a working high-speed digital line, and 13 is a backup high-speed digital line, forming a duplex network. 14 is a terminal switching device management line, and 15 is a terminal device connected to the current TDM 10.

Next, the operation will be explained. If there is a failure on the redundant network (for example, a failure in the current high-speed digital line 12 or a failure in the current TDM 10), the data on the terminal interface card 9 and the current path 7 will be destroyed. When a fault occurs, the network monitoring device 2 displays the occurrence status of the fault.

[0004] Therefore, when the operator presses a switching button on the control console 1 according to the fault area displayed on the network monitoring device 2, the command is sent from the switching status monitoring device 3 via the terminal switching device management line 14. The information is transmitted to the terminal switching device 4.

[0005] In the terminal switching device 4, the switching operation of the relay 6 on the switch card 5 is executed via the switch control section 43, so that the data of the terminal device 15 is passed through the backup path 8 to the backup path. It enters the terminal interface card 9 in the TDM 11, passes through the backup TDM 11, and is extended from the backup high-speed digital line 13 to the current network that was not affected by the failure.

[0006] In this terminal switching device 4, it is possible to switch the relay 6 by manual operation from the manual switching section 42 of the switching state display section 41, and the switching state is displayed from the display control section 44 on the switching state display section. Transmitted to 4 and LED
At the same time, the switching result is displayed from the switching status monitoring device 3 to the control console 1 via the terminal switching device management line 14.

[0007]

[Problem to be Solved by the Invention] Since the conventional terminal switching device is configured as described above, each station making up the network requires a separate switch switching status monitoring device and a terminal switching device management line that connects it. However, the network cannot be centrally monitored by a network monitoring device, and appropriate switching cannot be performed unless the operator fully understands the network and the devices that make up the network, and is also aware of the technical details.

[0008] Furthermore, as the network configuration becomes more complex, there have been problems such as an increase in the number of button operations on the control console.

[0009] This invention was made to solve the above-mentioned problems, and by detecting switching status monitoring information from an actual operational network monitored by a network monitoring device, it is possible to centrally monitor the network. It is an object of the present invention to provide a terminal switching device that enables automatic switching of terminal devices according to the content of a failure.

0010

[Means for Solving the Problems] A terminal switching device according to the present invention provides a monitoring channel for monitoring each of the working and standby high-speed digital lines on a duplex network, and also provides a monitoring channel for each terminal device. A control signal monitoring circuit that monitors the control signal of the terminal device is installed in the switch card for switching the terminal device, and by detecting an abnormality in the monitoring channel, the terminal device group connected to the active TDM is switched to the backup TDM. The corresponding terminal equipment can be automatically switched to the standby TDM, or by detecting an abnormality in the control signal monitoring circuit installed in each switch card.
It is designed to automatically switch individually to

[0011]

[Operation] The terminal switching device of the present invention receives the information necessary for switching by a control signal monitoring circuit provided in each switch card in the case of one terminal device, or from the actual operation network in the case of a group of terminal devices. It is collected by the monitoring channel provided above and input to the switch control section.

0012

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is a block diagram showing the configuration of a terminal switching device according to an embodiment of the present invention, and the same or corresponding parts as those in the conventional terminal switching device (FIG. 2) are given the same reference numerals and the explanation thereof will be omitted.

In FIG. 1, reference numeral 45 is connected to a monitoring channel on a duplex network, and is connected to a current high-speed digital line 12, a current line termination device, and a current TDM 1.
It is equipped with a monitoring data detection circuit 47 that collects fault information such as 0, and switches the working route (line) 71 to the backup route 72 for each terminal device group connected to the working TDM 10, and also switches the working route (line) 71 to the backup route 72 for each terminal device group connected to the working TDM10. A remote control card that switches to the backup path 72; 46, a relay that switches the card itself to the backup path 72 within the remote control card 45; 47, a monitoring data detection circuit; and 51, prepared corresponding to each terminal device 15. The current TDM 10 is installed on the switch card 5.
71 is a control signal monitoring circuit for detecting failure of the terminal interface card 9 in the terminal interface card 9, disconnection of the interface cable connected to this terminal interface card 9, etc.; 71 is a current high-speed digital line 12; a current line termination device; A monitoring channel active route (line) for transmitting information such as failures, 72 a backup high-speed digital line 13, a backup line termination device, and a backup monitoring channel route (line) for transmitting information such as failures of the backup TDM 11. route (line)
, 91 are monitoring channel terminal interface cards installed in the active and standby TDMs 10 and 11.

[0014] In this embodiment, the network monitoring device 2 visually displays the failure location, but it is only used by the operator for reference when isolating and tracking the failure location after an accident, and is not used as a means of avoiding failures. do not.

Next, the operation of the automatic switching means of the present invention will be explained. First, in the event of a large-scale failure in which the data on the terminal interface card 9 or the current path 71 is destroyed and becomes unusable due to a failure in the current high-speed digital line 12 or the current TDM 10, the monitoring channel terminal interface card 91 and the remote control card 4 in the terminal switching device 4 via the monitoring channel active route.
5, the monitoring data detection circuit 47 simultaneously analyzes the fault route and the state information of the relays 6 of each switch card 5 of the own station and the opposite station (not shown), and then transmits the fault information to the switch control unit 43. A switching command is transmitted to all switch cards 5 from the switch card 5. With that command, all the relays 6 are automatically switched, and the remote control card 45 itself is also automatically switched, and the actual operation data from each terminal device 15 enters the terminal interface 9 in the spare TDM 11 via the backup path 8. ,
It is multiplexed and expanded from the backup high-speed digital line 13 to a backup network that is not affected by existing failures.

The remote control card 45 used here is constantly cyclically connected to the remote control card 45 of the opposing station to monitor various conditions such as line failures, device failures, and SW switching states.

On the other hand, 9 units of terminal interface cards,
In other words, if a hardware malfunction occurs in the terminal interface card 9, which is a small-scale failure in one terminal unit, the change in the control signal passing through the current route 7 is reflected in the switch card 5. The control signal monitoring circuit 51 detects this information, transmits this information to the switch control section 43, and switches the relay 6 in the corresponding switch card 5 to the standby system according to a switching instruction from the switch control section 43. The result of the automatic switching means is transmitted from the display control section 44 to the switching state display section 41 and displayed on the LED.

[0018] Also, during testing or forced reverting, this can be done by operating a switch in the manual switching section 42.

In the above embodiment, the terminal interface card 9 is not particularly specified, but specifically, operating characteristics V24, X21, electrical characteristics V35, etc. are possible.
In addition to the voice interface, any data terminal interface that allows the user to know the usage status of the terminal may be used.

Further, in the above embodiment, manual operation of the terminal switching device 4 may be performed only from the main body, but may be performed remotely via a MODEM, a personal computer, or the like.

[0021] In the above embodiment, there are two systems, a working system and a backup system, and this backup system is completely a backup system and is not in operation. can be operated as a working system. This is similar to the case where the active system is switched to the backup system in the event of a failure, as shown in the embodiment, and multiple terminal equipment groups (groups) to be connected in the terminal switching device 4 can be specified, and the active system and the backup system can be specified. It is now possible to set which direction it is.

[0022]

[Effects of the Invention] As described above, according to the present invention, a monitoring channel for monitoring each of the working and standby high-speed digital lines is provided on a duplex network, and a monitoring channel is provided for each terminal device. A control signal monitoring circuit that monitors the control signal of the terminal device is provided in the switching switch card, and by detecting an abnormality in the monitoring channel, the terminal device group connected to the active TDM is switched to the spare TDM.
The network is configured to automatically switch to DM all at once, or to automatically switch individual terminal devices to a standby TDM by detecting an abnormality in the control signal monitoring circuit provided in each switch card. This has the effect of providing a terminal switching device that enables unified monitoring of the terminals and automatic switching of terminal devices depending on the content of the failure.

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing the configuration of a terminal switching device according to an embodiment of the present invention.

FIG. 2 is a block diagram showing the configuration of a conventional terminal switching device.

[Explanation of symbols]

4 The terminal switching device 5 Switch cards 10, 11 Current and backup TDMs 12, 13
Working and backup high-speed digital lines 45
Remote control card 47 Monitoring data detection circuit 51 Control signal monitoring circuits 71, 72 Monitoring channels Working and backup routes Note that in the drawings, the same reference numerals indicate the same or equivalent parts.

Claims (1)

[Claims] 1. A terminal switching device for switching a plurality of terminal devices connected to a duplex network formed by a current or backup high-speed digital line via a current or backup time division multiplexer, In addition to providing a monitoring channel to monitor each of the working and standby high-speed digital lines on the duplex network,
A control signal monitoring circuit that monitors the control signal of the terminal device is installed in the switching switch card prepared for each terminal device, and by detecting an abnormality in the monitoring channel, it is connected to the current time division multiplexing device. Either the group of terminal devices that are currently being used can be switched to a backup time division multiplexing device at once, or the terminal devices can be switched to a backup time division multiplexing device by detecting an abnormality in the control signal monitoring circuit provided in each switch card. A terminal switching device characterized by comprising automatic switching means for individually switching devices.