JPH04364651A - Isdn backup adaptor for management modem - Google Patents

Abstract

PURPOSE:To back up a fault through the use of an ISDN when the fault takes place in an analog telephone line or a management MODEM. CONSTITUTION:An ISDN backup adaptor 100 of a MODEM management side uses a management protocol transmission section 111 and a management protocol reception section 109 to send/receive management information with the MODEM management device connecting to a terminal 118. The ISDN backup adaptor 100 of a terminal equipment side uses the management protocol transmission section 111 and the management protocol reception section 109 to send/ receive management information with the MODEM management device via an FSK transmission section 113 and an FSK reception section 107 corresponding to a secondary channel. Then according to a command of the MODEM management device, a CCU 3 or a DTE 2 is selected from the side of the management MODEM NA1A (1B) to an ISDN terminal adaptor TA 120.

Description

[Detailed description of the invention]

0001

[Industrial Application Field] The present invention provides an integrated ISDN (ISDN)
d Services Digital Net
This article relates to an ISDN backup additional device for a management modem that automatically backs up the management modem.

0002

2. Description of the Related Art FIG. 2 is an explanatory diagram of a backup of a network system in which a large number of terminal devices are connected to a host computer through analog telephone lines and data is exchanged, processed, etc. In Figure 2, 1A and 1B are management modems (NM) that add management functions to conventional modem functions.
) and are connected to both ends of the analog telephone line. 2 is a terminal device such as a personal computer or various input/output devices (
DTE) and is connected to NM1B. 4 is a host computer (CPU), and 3 is a communication control unit (CCU) that connects the CPU 4 and each NM1A. 5 is a modem management device (NMP) for centrally monitoring a large number of management modems 1A and 1B;
B and analog telephone line failures can be recognized instantly. 6A and 6B are terminal adapters (TA) connected to ISDN, and constitute a backup line to be used when a failure occurs in the analog telephone line.

In the network system shown in FIG. 2, if a failure occurs in the analog telephone line connecting NM1A, 1B or NM1A and NM1B, the NMP
5 immediately detects that a failure has occurred and displays this. Based on this display, the system operator can, for example, change the connections marked with an x to connect TA1A to CCU3.
Connect TA1B to DTE2, and TA6A,
Start TA6B. Note that when the faulty analog telephone line or the like is restored, the operator restores the connection and stops the operation of TA6A and TA6B.

0004

[Problems to be Solved by the Invention] However, since the above data systems rely on operators to perform backup operations in the event of a failure, backup takes time, and the number of operators required is particularly high when the network becomes large. There was a problem in that the amount of time required for network operation increased. Furthermore, depending on the technical level of the operator, there are problems such as secondary failures such as system failure due to operational errors.

The present invention has been made to solve the above problem, and when a failure occurs in the management modem or analog telephone line, the terminal device connected to it is connected to the terminal adapter side by instructions from the modem management device. The purpose of the present invention is to provide an excellent ISDN backup addition device for a management modem that realizes automatic ISDN backup by switching to the ISDN backup modem.

[0006]

SUMMARY OF THE INVENTION In order to achieve the above object, the present invention provides means for transmitting and receiving management information using an ISDN terminal adapter connected to an ISDN and a secondary channel on an analog telephone line connected to a management modem. , switching means for connecting a terminal device or the like to the management modem or ISDN terminal adapter based on the management information received by the means.

[0007] The present invention also provides an ISD connected to an ISDN.
means for connecting an N-terminal adapter, a modem management device that centrally monitors a plurality of management modems, and a management modem that connects to an analog telephone line;
The modem management device includes means for transmitting and receiving management information to and from the modem management device, and switching means for connecting a terminal device, etc. to either the management modem or the ISDN terminal adapter based on the management information received by the means. be.

[0008]

[Operation] The ISDN backup additional device attached to the management modem on the modem management device side sends management information from the modem management device to the management modem and branches part of it, and also sends management information from the management modem to the modem. Management information is exchanged with the modem management device by sending it to the management device and inserting its own management information therein. When receiving a switching instruction from the modem management device, the communication control device, etc. connected to the management modem side is switched to the ISDN terminal adapter side.

On the other hand, an ISDN backup additional device attached to a management modem on the side of a terminal device connects to the modem management device by branching and inserting management information to the secondary channel on the analog telephone line connected to the management modem. Exchange management information. Then, when receiving a switching instruction from the modem management device, the terminal device, etc. connected to the management modem side is switched to the ISDN terminal adapter side.

0010

DESCRIPTION OF THE PREFERRED EMBODIMENTS The ISDN backup addition device according to the present invention is used in conjunction with NM1A and NM1B in FIG. 2, respectively.

FIG. 1 shows an ISDN backup addition device with N
This is a configuration diagram when installed alongside M1B, and 100 is this I
A block diagram showing an embodiment of the SDN backup additional device, 1B is a management modem NM, 2 is a terminal device DTE
It is. Terminal 1 of ISDN backup additional device 100
05 is connected to an analog telephone line, and terminal 121 is connected to ISDN. Terminals 101, 103, and 104 are connected to the analog telephone line of NM1B, the management channel connection terminal, and the terminal device, respectively, and terminal 102 is connected to DTE2. Note that the terminal 118 is a connection terminal to the modem management device, and is not used in this case.

First, the ISDN backup addition device 10
The operation in the case where 0 uses an analog telephone line according to instructions from the modem management device will be described below.

Signals from the analog telephone line are input to terminal 105 of ISDN backup add-on device 100. As shown in FIG. 3, this signal is composed of a main channel 201 such as QAM modulation and a secondary channel 202 of FSK modulation for transmitting management information. This signal is input to NM1B through switch & insert SW & INS114 and terminal 101, and a part of it is branched at SW & INS114, and filter FIL1
06 is input. The input signal is this FIL106
Only the secondary channel is extracted in FSK demodulator 1
07 and demodulated. The demodulated signal is input to the management protocol receiving section 109 via the switch SW108. The protocol receiving unit 109 decodes the input signal to determine whether there is a command or information related to the ISDN backup additional device or whether it has been sent from the NMP5 or NM1A shown in FIG. 2, and controls the result. 110. The control unit 110 issues operation instructions to each unit based on the results, and also performs the above-mentioned N
When a response or information to MP5 or NM1A is required, the management protocol transmitter 111 is instructed to that effect. The management protocol transmitter 111 switches and switches the management protocol according to the instructions.
It is sent to the FSK transmitter 113 via the insert SW & INS 112. The FSK transmitter 113 converts the input signal into an FSK signal of the secondary channel 202 shown in FIG. 3, and sends it to the SW&INS 114. SW&INS11
4 drops the secondary channel input from NM1B through the terminal 101, inserts the FSK signal of the secondary channel output from the FSK transmitter 113, and sends it from the terminal 105 to the analog telephone line. Note that the secondary channel FS is transmitted from the FSK transmitter 113.
If the K signal is not output, the FSK signal of the secondary channel from NM1B is directly sent to SW&INS114.
from terminal 105 to the analog telephone line.

In this way, the control section 110 and the NM1B of the ISDN backup addition device 100 share the secondary channel on the analog telephone line, while
It exchanges commands, responses, information, etc. with the MP5 or NM1A. The ISDN backup additional device 100 is used to exchange data between the NM1B and the DTE2.
S in the interface signal from NM1B is carried out via terminal 103, switch SW116, and terminal
Q (signal quality), CD (carrier detection)
is sent to the control unit 110 via the SW 116.

Next, the above-mentioned ISDN backup addition device 100 performs ISDN backup according to instructions from the NMP 5 shown in FIG.
The operation when using a network will be explained below. In this case, the management protocol processing unit 115 is a general
It is connected to ISDN through the SDN terminal adapter TA120 and terminal 121, and exchanges commands, responses, and information with the NMP 5 shown in FIG. 2 via this ISDN. That is, the management protocol processing unit 115
sends the processed results to the control unit 110, and the control unit 1
When there is a request to send a management protocol from TA 10, the management protocol is sent to ISDN via TA 120 and terminal 121. On the other hand, switch SW11
6 connects the DTE 2 to the TA 120 based on instructions from the control unit 110.
Terminal device interface DTEI/F117 connected to
Connect to.

[0016] The LCD & switch 119 is composed of an LCD and a setting switch, and is used to issue various setting instructions. Protocol information, NM1B
The operation mode of the entire ISDN backup addition device 100 is determined based on the SQ, CD, etc. from SW10.
8, 116 and SW&INS 112, 114 to control their operations.

Next, a case where the ISDN backup addition device according to the present invention is installed alongside the NM1A in FIG. 2 will be described. In this case, the configuration shown in Figure 1 is to replace NM1B with NM1A.
In this configuration, the DTE 2 is replaced with a CCU 3, and the NMP 5 is connected to the terminal 118 of the ISDN backup addition device 100. Hereinafter, the operation will be described using FIG. 1 assuming that FIG. 1 has been modified to the above configuration.

First, the ISDN backup addition device 10
0 uses an analog telephone line, commands and information output from the NMP 5 are input to the terminal 118 of the ISDN backup addition device 100. Input commands and information are sent to NM1A via SW108 and terminal 104.
At the same time, a part of it is branched at SW 108 and input to management protocol receiving section 109 . Conversely, responses and information outputted from the management channel terminal of NM1A and inputted to terminal 104 are sent to NMP5 via SW&INS 112 and terminal 118. The management protocol receiving section 109 decodes the commands and information from the SW 108 and sends the results to the control section 110. Control part 1
10 is the management protocol transmitter 1 if it is necessary to send a response and information to the NMP 5 based on this result.
11 to control the SW&INS 112. SW&
The INS 112 drops the above response and information from the NM 1A, inserts the response and information output from the management protocol transmitter 111, and sends the response to the terminal 11.
8 to NMP5. Also, NM1A and the analog telephone line are the ISDN backup additional device 10.
NM1A and CCU3 are connected through terminal 101, SW & INS114, and terminal 105 of 0, and NM1A and CCU3 are connected through terminal 103, SW
116, connected via the terminal 102.

Next, when the ISDN backup addition device 100 described above uses an ISDN line, the NM of FIG.
The management protocol processing unit 115 exchanges commands, responses, and information with the ISDN backup additional device attached to the 1B via the terminal 121 and TA 120 connected to the ISDN. Also, NMP5
Terminal 11 is used for sending and receiving commands, responses, and information between
8, SW 108, and SW&INS 112, the management protocol receiving section 109 and the management protocol transmitting section 111 perform the processing. Here, the management protocol processing unit 115, the management protocol receiving unit 109, and the management protocol transmitting unit 111
is connected to the control section 110. CCU3 is terminal 10
2. Connected to the ISDN line via SW 116, DTEI/F 117, TA 120, and terminal 121.

[0020] Furthermore, the ISDN backup addition device 10
0 is attached to NM1A shown in Figure 2, FIL10
6, FSK receiving section 107, FSK transmitting section 113 and S
W&INS 114 may be omitted.

[0021]

As described above in detail, according to the present invention, management information can be sent and received using the secondary channel on the analog telephone line connected to the management modem, or management information can be transmitted and received directly with the modem management device. Since it is possible to send and receive information and switch a terminal device connected to the management modem to an ISDN terminal adapter connected to the ISDN based on management information from the modem management device, the ISDN backup additional device according to the present invention can be switched to an ISDN terminal adapter connected to the ISDN based on the management information from the modem management device. By attaching it to a management modem, you can easily configure a network system that incorporates an ISDN automatic backup function.

[Brief explanation of the drawing]

FIG. 1 is a configuration diagram of an embodiment of the present invention.

FIG. 2 is an explanatory diagram of backup in the network system.

FIG. 3 is a diagram showing the structure of signals on an analog telephone line.

[Explanation of symbols]

100 ISDN backup additional device 106
Filter 107 FSK receiving section 109 Management protocol receiving section 110
Control unit 111 Management protocol transmission unit 113
FSK transmitter

Claims (2)

[Claims] 1. An ISDN terminal adapter connected to an ISDN, means for transmitting and receiving management information using a secondary channel on an analog telephone line connected to a management modem, and a terminal device, etc. based on the management information received by the means. 1. An ISDN backup addition device for a management modem, comprising switching means for connecting the management modem or the ISDN terminal adapter to the management modem or the ISDN terminal adapter. 2. Means for connecting an ISDN terminal adapter that connects to an ISDN, a modem management device that centrally monitors a plurality of management modems, and a management modem that connects to an analog telephone line, and a means for connecting an ISDN terminal adapter that connects to an ISDN, a modem management device that centrally monitors a plurality of management modems, and a management modem that connects to an analog telephone line; a means for transmitting and receiving information, and a means for transmitting and receiving a terminal device, etc., to the management modem or IS based on the management information received by the means.
An ISDN backup addition device for a management modem, characterized in that it is equipped with a switching means for connecting to a DN terminal adapter.