JP2000270044A - Communication controller - Google Patents

Abstract

PROBLEM TO BE SOLVED: To make it easy to demarcate a fault occurrence section and to transfer fault information to an opposite device. SOLUTION: A terminal-side fault detecting circuit 12 of this communication controller generates a fault signal from elements of a fault signal detected by a terminal-side line drive circuit 10 and a fault signal detected by a terminal- side line format circuit 11 and sends it out to a fault converting circuit 15. A repeating-side fault detecting circuit 18 generates a fault signal from elements of a fault signal detected by a repeating-side line drive circuit 16 and a fault signal detected by a repeating-side line format circuit 17 and sends it out to the fault converting circuit 15. The fault converting circuit 15 converts the fault signals to the transmission format of fault signals of an opposite line and transfers them as fault information to the opposite side.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a communication control device for controlling communication between lines having different interfaces, and more particularly to a communication control device having a function of displaying a fault alarm on a line and monitoring transfer.

[0002]

2. Description of the Related Art In a communication control device such as a terminal adapter for performing communication by connecting different lines, information on a line failure is generally displayed on display means provided in the communication control device.

[0003]

However, in the conventional method as described above, when a failure occurs in a line, it is difficult to isolate the location where the failure has occurred, and the failure is reported to an opposing device. There was a problem of difficulty.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-described problems, and has as its object to provide a communication control device which facilitates isolation of a failure occurrence location and enables transfer of fault information to an opposite device. Aim.

[0005]

In order to solve the above-mentioned problems, the invention according to claim 1 of the present invention provides a method for performing data communication between terminal devices connected to lines having different interfaces. In a communication control device that performs interface conversion, a failure detection circuit that detects a failure occurring in the line, and a failure signal conversion circuit that converts a failure signal detected by the failure detection circuit into a transmission format of a failure signal of a partner line. It is characterized by having.

According to a second aspect of the present invention, the fault detecting circuit detects a fault occurring on a line on the terminal device side, and detects a fault occurring on a relay line with a network. And a relay-side fault detection circuit.

According to a third aspect of the present invention, there is provided a terminal line drive circuit for level-converting a signal transmitted / received to / from the terminal device and detecting whether or not the signal level is normal, and data received from the terminal device. A terminal-side line format circuit for detecting a CRC error in the normality of a column, detecting a failure from an alternating sequence of frame synchronization bits, and data continuity, and generating a format of a terminal device interface when transmitting data from the terminal device; CRC error detection of the normality of the data stream received from the line on the side, failure detection from the alternation order of the frame synchronization bits, data continuity, and data from the terminal side line format circuit to the data format of the network side line. The terminal side fault detection circuit includes a terminal side line drive circuit and a relay side line drive circuit. A fault signal is generated from the fault signal detected by the terminal-side line format circuit and an element of the fault signal and sent to the fault detection circuit. The relay-side fault detection circuit includes the relay-side line drive circuit and the relay-side line format circuit. A fault signal is generated from the fault signal detected in step (1) and the elements of the fault signal and sent to the fault detection circuit.

Therefore, according to the present invention, not only interface matching (signal format conversion, data format conversion) between lines having different interfaces but also the detected fault signal to the interface of the partner line by the fault signal conversion circuit 15. Since the signal is converted into a signal having a matching form and transmitted to the partner line, the trouble information can be transferred to the opposite side, and the trouble can be easily identified. Further, fault information between the communication control device and the office line can be transmitted to the opposing communication device in the same manner as in the above-described case, so that fault detection of the terminal device becomes easy.

[0009]

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

FIG. 1 is a configuration diagram of a communication system configured using the communication control device of the present invention, and FIG. 2 is a block diagram showing an internal configuration of the communication control device according to the embodiment of the present invention.

In FIG. 1, reference numerals 1 and 9 denote terminal devices to be communicated with each other. These terminal devices 1 and 9 are connected to respective communication control devices 3 and 7 via line cables 2 and 8, respectively. The communication control devices 3 and 7 are connected to a line 5 via line cables 4 and 6.

In FIG. 2, the communication control devices 3 and 7 include a terminal-side line drive circuit 10, a terminal-side line format circuit 11, a terminal-side failure detection circuit 12, a terminal / relay conversion circuit 14, a failure signal conversion circuit 15, a relay A side line format circuit 16, a relay side line drive circuit 17, and a relay side fault detection circuit 18 are provided.

The terminal-side line drive circuit 10 converts a signal received from the terminal device 1 (or the terminal device 9) into a signal level used in the communication control device, and converts the received signal from a signal used in the communication control device. The signal level is converted into a signal level to be transmitted to the terminal device 1 (or the terminal device 9), and whether or not the signal reception level is normal is detected.

The terminal-side line format circuit 11 comprises:
The normality of the data string received from the terminal device 1 (or the terminal device 9) is detected by a CRC error detection, a fault detection based on an alternating sequence of frame synchronization bits, and data continuity. Further, it has a function of extracting only data and sending it to the relay side line format circuit 16, and also generates a format of the terminal device interface when the terminal device 1 (or the terminal device 9) transmits data.

The terminal side fault detection circuit 12 includes a terminal side line drive circuit 10, a terminal side line format circuit 11
In addition to generating the fault signal by detecting the fault signal and the component signal of the fault signal detected in step 1, the terminal device 1
(Or a terminal device 9).

The terminal / relay conversion circuit 14 transmits and receives data between the terminal-side line format circuit 11 and the relay-side line format circuit 16. Data transmission and reception at this time are performed through a memory circuit that absorbs temporal fluctuations of internal data.

The fault signal conversion circuit 15 converts a fault signal of the line connected to the terminal line drive circuit 10 and a fault signal of the line connected to the relay line drive circuit 17 into a signal corresponding to both fault signals. It is something to convert.

The relay side line format circuit 16 comprises:
The normality of the data string received from the line 5 is detected by a CRC error detection, a fault detection is performed by an alternating sequence of frame synchronization bits, and data continuity. In addition, it has a function of extracting only data and sending it to the terminal-side line format circuit 11, and a mechanism for converting data from the terminal-side line format circuit 11 into the data format of the line 5 and sending it to the relay-side line drive circuit 17. Having.

The relay line drive circuit 17 converts a signal received from the line 5 into a signal level used in the communication control device, and converts the signal used in the communication control device into a signal level transmitted to the line 5. It is something to convert.

The relay side fault detecting circuit 18 includes a relay side line drive circuit 17, a relay side line format circuit 16
In addition to generating the fault signal by detecting the fault signal and the component signal of the fault signal detected in (1), it has a function of mounting the fault detection signal on the connected line.

Next, the operation of the present embodiment configured as described above will be described.

First, the case where a failure (no signal level) is detected on the terminal side line drive circuit will be described. In this case, when the terminal-side line drive circuit 10 detects a state where there is no signal level, a signal indicating “no reception level” is sent to the terminal-side fault detection circuit 12. Upon receiving this signal, the terminal-side fault detection circuit 12 displays "no reception level" and generates a fault signal. And this fault signal,
It is sent to the terminal device 1 via the terminal-side line format circuit 11 and the terminal-side line drive circuit 10 to notify that the transmission side of the terminal device 1 is abnormal. Further, the fault signal is sent to the fault signal conversion circuit 15. In response to the failure signal, the failure signal conversion circuit 15 converts the failure signal into a signal conforming to the interface of the line 5 and sends the signal to the relay failure detection circuit 18.

Relay side fault detecting circuit 18 receiving fault signal
Then, the fault signal is transmitted to the relay side line format circuit 1
6. The relay side line drive circuit 17 sends the signal to the terminal device on the opposite side via the line 5 to notify that the transmission side of the terminal device 1 is abnormal.

When a fault (no signal level) is detected on the relay line drive circuit side, when the relay line drive circuit 17 detects a state where there is no signal level, the relay side fault detection circuit 18 sends a "no reception level" signal. Send a signal.
Upon receiving this signal, the relay-side fault detection circuit 18 displays "no reception level" and generates a fault signal. Then, this failure signal is sent to the terminal equipment on the opposite side via the relay line format circuit 16, the relay line drive circuit 17, and the line 5 to notify that the line 5 is abnormal. Further, the fault signal is sent to the fault signal conversion circuit 15. Fault signal conversion circuit 1 receiving this fault signal
In 5, the failure signal is converted into a signal in a form that matches the interface of the terminal device 1 and sent to the terminal-side failure detection circuit 12.

The terminal-side fault detection circuit 12 that has received the fault signal
Then, this failure signal is sent to the terminal side line format circuit 1
1. Send to the terminal equipment 1 via the terminal side line drive circuit 10 to notify that the line 5 side is abnormal.

According to the communication control apparatus of the present embodiment as described above, not only interface matching (signal format conversion, data format conversion) between lines having different interfaces, but also a detected fault signal is converted into a fault signal. The circuit 15 converts the signal into a signal conforming to the interface of the partner line and transmits the signal to the partner line, so that the failure information can be transferred to the partner side, and the failure can be easily identified. In addition, since the failure information between the communication control device and the office line can be transmitted to the opposite communication device in the same manner as described above,
Failure detection of terminal equipment becomes easy.

Next, an embodiment in which the communication control apparatus of the present invention is applied to a general line will be described with reference to FIG. FIG. 3 is a fault signal transfer diagram showing how a fault signal is transferred.

In FIG. 3, a terminal device 30 having a Y interface is connected to a communication control device 31 of the present invention.
Further, the communication control device 31 converts the Y interface into the I interface and is connected to the line terminating device 32. Then, the line terminating device 32 is connected to the line terminating device 33 via a line facility 44. The line terminating device 33 is connected to the opposite communication control device 34 via an I interface. Further, the communication control device 34 converts the I interface to the Y interface and is connected to the terminal device 35.

A case where a failure occurs between the terminal device 30 and the communication control device 31 in the above configuration will be described.

In FIG. 3, when a failure occurs between the terminal device 30 and the communication control device 31, if a signal from the terminal device 30 to the communication control device 31 is interrupted at the failure location 36 (or loss of synchronization occurs), Communication control device 31
The terminal side line drive circuit 10 shown in FIG. 2 detects "no signal", and the terminal side fault detection circuit 12 performs a fault detection display "REC" 37. Then, the terminal side fault detection circuit 1
2 detects the REC 37, generates a “SEND” (signal notifying the disconnection or loss of synchronization of the transmission signal between the local terminal device and the line terminating device) 38, and generates the terminal line format circuit 11 shown in FIG. The information is sent to the terminal device 30 via the terminal-side line drive circuit 10 to notify that the transmission side of the terminal device 30 is abnormal.

Further, the fault signal conversion circuit 15 shown in FIG.
Is the same signal "UNR" (the other terminal equipment-
A signal for notifying the transmission signal loss or loss of synchronization between the line terminating devices) is converted into all the main signals 1 (40) in the I interface and sent to the relay side fault detection circuit 18 shown in FIG. Then, the relay side fault detection circuit 18
Are sent to the opposing communication control device 34 via the relay line format circuit 16 and the relay line drive circuit 17 shown in FIG. In the opposite communication control device 34, all the main signals 1 (4
0) is detected as the main signal all 1 (41) by the function of the opposite side relay line format circuit 16 shown in FIG.

When all the main signals 1 (41) are detected by the opposite-side relay-side line format circuit 16, the opposite-side relay-side fault detection circuit 18 sends the same signal to the opposite-side fault signal conversion circuit 15. The opposite-side fault signal conversion circuit 15 outputs all main signals.
(41) is sent to the opposing terminal device 35 as “UNR” 42 to notify the opposing terminal device 35 that a failure has occurred in the own station.

In FIG. 3, the fault signal transfer path 4
3 shows a case where a failure has occurred between the terminal device 35 and the communication control device 34.

As described above, even if the line interface of the terminal device is different from the line connected by the Y interface, the information of the fault signal can be notified to the partner terminal, which is effective for fault search.

FIG. 4 is a failure signal transfer diagram when the communication control device of the present invention is applied to a communication system connected by a basic speed I interface and a primary rate interface.

In FIG. 4, terminal devices 50 and 59
Has terminal adapters 51 and 58, and the terminal adapter 51 is connected to the communication control device 52 of the present invention by the basic speed I interface. Further, the communication control device 52 is connected to the line terminating device 53. The line terminating device 53 is connected to a line terminating device 56 via a line facility 55. The line terminating device 56 is connected to the opposing communication control device 57 via the basic speed I interface. Further, the communication control device 52 and the communication control device 57 are connected by a primary group speed interface for converting a basic speed into a primary group speed.

[0037]

As described above, according to the present invention, not only interface matching between lines having different interfaces but also a detected fault signal is converted by the fault signal conversion circuit 15 into a signal having a form matching the interface of the partner line. Thus, the failure information can be transferred to the opposite side, and the failure can be easily identified. Further, since fault information between the communication control device and the office line can be transmitted to the opposing communication device in the same manner as in the above case, there is an effect that fault detection of the terminal device can be easily performed.

[Brief description of the drawings]

FIG. 1 is a configuration diagram of a communication system configured using a communication control device of the present invention.

FIG. 2 is a block diagram showing an internal configuration of a communication control device according to the embodiment of the present invention.

FIG. 3 is a fault signal transfer diagram showing how a fault signal is transferred in an embodiment in which the communication control device of the present invention is applied to a general line.

FIG. 4 is a failure signal transfer diagram when the communication control device of the present invention is applied to a communication system connected by a basic rate I interface and a primary rate interface.

[Description of Signs] 1, 9 Terminal equipment 2, 4, 6, 8 Line cable 3, 7 Communication control device 5 Line 10 Terminal side line drive circuit 11 Terminal side line format circuit 12 Terminal side fault detection circuit 14 Terminal / relay conversion Circuit 15 Fault signal conversion circuit 16 Relay line format circuit 17 Relay line drive circuit 18 Relay side fault detection circuit

Claims (3)

[Claims] 1. A communication control device for performing interface conversion between a terminal device and a line when performing data communication between terminal devices connected to lines having different interfaces, comprising: a failure detection circuit for detecting a failure occurring on the line; And a fault signal conversion circuit for converting the fault signal detected by the fault detection circuit into a transmission format of a fault signal of a partner line. 2. The terminal failure detection circuit, wherein the failure detection circuit detects a failure occurring in a line on the terminal device side;
2. The communication control device according to claim 1, further comprising: a relay-side fault detection circuit that detects a fault occurring in a relay-side line with the network. 3. A terminal side line drive circuit for level-converting a signal transmitted / received to / from the terminal device and detecting whether or not the signal level is normal, and a CRC error check for a data string received from the terminal device. A terminal-side line format circuit that detects a failure from the detection, alternation order of frame synchronization bits, and continuity of data, and generates a terminal device interface format when transmitting data from the terminal device; and data received from the network-side line. A relay line format for detecting a CRC error in the normality of a column, detecting a failure from an alternating sequence of frame synchronization bits, and data continuity, and converting data from the terminal line format circuit into a data format of a network line. A terminal side line drive circuit and a terminal side line format. A fault signal generated from the fault signal detected by the circuit and a fault signal element is generated and sent to the fault detection circuit, and the fault detection circuit detects the fault detected by the relay line drive circuit and the relay line format circuit. 2. The communication control device according to claim 1, wherein a fault signal is generated from elements of the signal and the fault signal and sent to the fault detection circuit.