JPH0730572A - Communication circuit for network monitor information - Google Patents

Abstract

PURPOSE:To report fault information by looping back fault information of a subordinate ring line at a tributary station, allowing a fault occurrence station to cut off an order wire line and allowing a master station to release the cut of order wire line. CONSTITUTION:An overhead byte inputted from a west side line WL is separated in a separate section 1W, in which a signal and monitor information of an order wire line are extracted. An overhead byte inputted from an east side line EL is separated in a separate section 1E, in which a signal and monitor information of an order wire line are extracted. The digital signal of the order line is D/A-converted by a D/A converter section 2W and sent to a host ring line L1 through an adder section A. On the other hand, the monitor information is looped back by a loopback section 3W and multiplexed on a digital signal of the order wire line at a multiplexer section 5W and sent to the west line WL. Thus, even when line fault takes place, the monitor information is reported to a master station of the lower rank ring line L2.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a communication circuit for monitoring information in a network. For example, a ring network is a system that communicates by connecting a plurality of distributed stations with a duplicated ring-shaped transmission path. Each node device constructs a highly reliable network by selecting and transmitting data sent from the normal transmission line in the duplicated clockwise and counterclockwise transmission lines. be able to.

In such a digital network, it is general that a part of the overhead byte is used to construct an order wire line for use by a network maintainer as a meeting line. The other part is used for sending and receiving supervisory signals.

FIG. 6 is a diagram for explaining an order wire line of a ring network. The figure is an example of a ring network composed of one master station M and three slave stations S1 to S3, and only the master station M is shown.

In the configuration shown in the figure, the one connected to the west side line WL is shown by W, and the one connected to the east side line EL is shown by E, and W and E have a symmetrical structure.
Further, here, only the circuit related to the overhead byte which is the object of the present invention is shown, and the line related to the main signal is omitted.

In the figure, 1W and 1E are separation parts (OHBD in the figure)
MUX), 2W, 2E are digital / analog (hereinafter referred to as D / A) conversion units, 4W, 4E are analog / digital (hereinafter referred to as A / D) conversion units, 5W, 5
E is a multiplexer (shown as OHBMUX in the figure), A1 to A3 are adders, H1 is a hybrid coil (shown as HYB in the figure), and Tel is a telephone.

The overhead byte input from the slave station S1 is taken out from the digital signal for the order wire line by the separation unit 1W, converted into an analog signal by the D / A conversion unit 2W, and the converted analog signal is added by the adder A1 to the master station. Audio signals from M's telephone Tel are added, and A / D
It is sent to the slave station S3 through the converter 4E and the multiplexer 5E.

A voice signal from the telephone Tel of the master station M is added to the reverse signal by the adder A2, and the signal is sent to the slave station S1. In addition, the digital signal of the order wire line input from the slave station S1 is converted into an analog signal.
A / D conversion of the A / D converted signal and the digital signal of the order wire line input from the slave station S3 into an analog signal
After the converted signals are added by the adder A3, the signals are sent to the telephone Tel through the hybrid coil H1.

Although the above description describes the transmission and reception of the voice signal of the order wire line in the master station M, the slave stations S1 to S3 perform the same processing, and the telephones Tel of the respective stations communicate with each other. ing.

[0009]

2. Description of the Related Art FIG. 7 is a block diagram illustrating a conventional ring network. In the configuration shown in the figure, the basic configuration described in FIG. 6 is provided with switches SW1 and SW2 for disconnecting the order wire line. This is because in the circuit of the basic configuration of FIG. 6, the order wire line forms a loop through the master station M and the slave stations S1 to S3, so that oscillation occurs when the loop gain becomes "1" or more. There are cases. In order to prevent such oscillation, the lines connected to the WEST side are cut by switches SW1 and SW2 to prevent the order wire lines from forming a loop. This is called a ring protection function.

Further, the amount of data to be processed has been increasing with the sophistication and widening of communication networks, and such ring networks have come to be used in a multiplex configuration.

FIG. 8 is a diagram for explaining a conventional multi-ring network. FIG. 8A is an example of a multi-ring composed of two rings. In FIG. 8, L1 is an upper ring line,
M is a master station, S1 and S2 are slave stations, L2 is a lower ring line, m is a master station, s1 and s2 are slave stations, T
Is a tributary station.

For example, the upper ring line L1 is 1.5 MH
With a configuration of z × 4 lines, and connecting 1.5 MHz × 1 line among them to the lower ring line L2, each station communicates in the upper ring line L1 and the lower ring line L2, and between the stations. However, it is configured to be able to communicate.

[0013]

FIG. 8B is a diagram for explaining a problem when a failure occurs in the configuration of FIG. 8A.

For example, slave station s1 and slave station s2
It is assumed that a line failure occurs at the point P of the lower ring line L2 between them. At this time, the west side line of the ring line L2 of the master station m is cut off from the order wire line. Further, the slave station s1 detects a failure and cuts the east side line EL of the slave station s1. Calls on the order wire line between stations are disabled.

Further, since the fault information is terminated at the tributary west station TW, it is interrupted at the tributary west station TW, and it becomes impossible to notify the fault information. The present invention is intended to realize a network monitoring information communication circuit capable of notifying failure information even when a line failure occurs in a communication network, and capable of making a call through an order wire line.

[0016]

FIG. 1 is a block diagram for explaining the principle of the present invention. In the figure, L1 is an upper ring line, L2 is a lower ring line, A is an addition unit for sending information of the lower ring line L2 to the upper ring line L1, a
Is an adder for sending the information of the upper ring line L1 to the lower ring line L2.

Further, T is a tributary station connecting the upper ring line L1 and the lower ring line L2, and the tributary station T is a tributary west station TW connected to the west side line WL of the lower ring line L2 and a tributary west station TW. The tributary east station TE has a symmetrical structure and is connected to the east side line EL of the lower ring line L2.

Further, 1W and 1E in the tributary west station TW and the tributary east station TE are separation units for separating the overhead byte input from the west side line WL and the east side line EL into a signal of the order wire line for voice and a monitor signal. Yes, 2W and 2E are D / A conversion units (shown as D / A units in the figure) that perform D / A conversion on the audio order wire line signals separated by the separation units 1W and 1E, and 3W and 3E are separated. This is a loopback section that loops back the monitoring signals separated by the sections 1W and 1E.

4W and 4E are A / D converters (A / D in the figure) for A / D converting signals on the order wire line for voice.
(Shown as part D), and 5W and 5E are folded parts 3W and 3E.
The supervisory signal returned at E and the outputs of the A / D converters 4W and 4E are multiplexed and used as an overhead byte on the west side line W.
L, which is a multiplexing unit for outputting to the east side line EL, enables the supervisory signal to be communicated even when a failure occurs by folding back the supervisory signal in the return units 3W and 3E.

[0020]

The signal input from the west side line WL is composed of the main signal + overhead byte, and this is separated into the main signal and the overhead byte by a separating device (not shown).
Since the subject of the invention is in the processing of overhead bytes, the main signal will not be described.

The overhead byte is separated by the separation unit 1W, and the signal of the order wire line and the monitoring information are extracted. The overhead byte input from the east side line EL is separated by the separating unit 1E, and the signal and monitoring information of the order wire line are extracted. Since the processing of the signal input from the west side line WL and the processing of the signal input from the east side line EL are completely symmetrical below, the input from the west side line WL will be representatively described.

The digital signal on the order wire line is D /
The signal is D / A converted by the A converter 2W and is sent to the upper ring line L1 through the adder A. On the other hand, the monitoring information is returned by the return unit 3W, multiplexed with the digital signal of the order wire line by the multiplexing unit 5W, and sent to the west side line WL, so that the monitoring information of the lower ring line L2 is transmitted even if a line failure occurs. The master station m can be notified.

[0023]

FIG. 2 is a block diagram (1) for explaining an embodiment of the present invention. In the figure, T is a tributary station, TW in the tributary station T is a tributary west station connected to the west side line WL, and TE is a tributary east station connected to the east side line EL with a configuration symmetrical to the tributary west station TW. .
The tributary east station TE has a symmetric configuration with the tributary west station TW, and therefore the configuration is omitted in the figure.

Here, the operation is the same as the tributary west station TW and the tributary east station TE, so that the tributary west station TW will be described as an example. At Tributary West Station TW,
The overhead byte is separated by the separation unit 1W, and the signal of the order wire line and the monitoring information are taken out. After returning this monitoring information, it is sent to the west side line WL through the multiplexing unit 5W. At this time, the folding section 3W described in the principle diagram is configured by an OR circuit (hereinafter referred to as an OR circuit) 31W.

The tributary west station TW is equipped with a line controller and a monitor controller 6W for monitoring its own device. When the monitor controller 6W detects a failure, the failure detection information is set to O.
The R circuit 31W can send back the information as information added to the input monitoring information. In this case, the monitoring information is polarized so as to detect the "high" level in the failure detection.

With this configuration, the line fault occurring at P in FIG. 8B is detected by the slave station s1, the fault detection information is returned by the tributary west station TW, and the slave station s1 is transmitted. It becomes possible to notify the master station m through.

FIG. 3 is a block diagram (2) for explaining an embodiment of the present invention. Since the slave stations s1 to sn have the same configuration, the slave station s1 will be representatively described.
When the line failure occurs at P in FIG. 8B, the master station m cuts the order wire line in the west side by the ring protection function, and the call between the master station m and the slave station s1 becomes impossible. . Therefore, in the master station m that has detected from the supervisory signal that a line failure has occurred, the switches SW1 and SW2 are turned on to connect the order wire line. On the contrary, in the station where the line failure is detected, here, the slave station s1, the switch is turned off to cut the order wire line. With such a configuration, the order wire line is connected through the tributary east station TE, and even if a failure occurs, the order wire communication between the master station m and the slave station s1 becomes possible.

FIG. 4 is a block diagram (3) for explaining the embodiment of the present invention. The illustration shows a plurality of network lines L11 ...
Connection station 10 including connection units 11 to 1n for connecting L1n
A communication circuit for network monitoring information in 0,
11-1n are connection parts, D1-Dn are extraction parts, R1-Rn
Is a folded portion, and I1 to In are insertion portions.

A master station (not shown) and a plurality of slave stations are connected to the network lines L11 to L1n. In this connection, the monitoring information is extracted by the extraction units D1 to Dn, folded back by the folding units R1 to Rn, inserted in the overhead bytes by the insertion units I1 to In, and output to the connected network lines L11 to L1n. Even when it occurs, it is possible to communicate the monitoring information.

FIG. 5 is a block diagram (4) explaining an embodiment of the present invention. The figure shows one master station M and a plurality of relay stations r1 to rn accommodated in one network line L10.
And a network for monitoring information of the network consisting of terminal stations T1 and T2 connected to both ends of the network line L10. The terminal stations T1 and T2 are the extraction sections D1 and D2, the folding sections R1 and R2, and the insertion section I1. , I2.

With this connection, the monitoring information is extracted by the extraction units D1 and D2, folded back by the folding units R1 and R2, and inserted into the insertion units I1 and I2.
Since it is inserted into the overhead byte at 2 and output to the connected network line L10, even when a line failure occurs,
It becomes possible to communicate monitoring information.

[0032]

According to the present invention, in the multiple ring network, the fault information of the lower ring line is returned at the tributary station to cut the order wire line at the faulty station and release the cut of the order wire line at the master station. As a result, even if a failure occurs, it is possible to notify the failure information, and it is also possible to make a call via the order wire line.

[Brief description of drawings]

FIG. 1 is a block diagram illustrating the principle of the present invention.

FIG. 2 is a block diagram (1) illustrating an embodiment of the present invention.

FIG. 3 is a block diagram (2) illustrating an embodiment of the present invention.

FIG. 4 is a block diagram (3) illustrating an embodiment of the present invention.

FIG. 5 is a block diagram (4) illustrating an embodiment of the present invention.

FIG. 6 is a diagram illustrating an order wire line of a ring network.

FIG. 7 is a block diagram illustrating a conventional example.

FIG. 8 shows an example of a network having a conventional multiple ring configuration.

[Explanation of symbols]

 M, m master station S1 to Sn, s1 to sn slave station T tributary station TW tributary west station TE tributary east station 1W, 1E separation section 2W, 2E D / A conversion section 3W, 3E, R1 to Rn folding section 31W, 31E OR circuit 4W, 4E A / D converter 5W, 5E Multiplexer 6W, 6E Supervisory controller SW1, SW2 Switch L1 Upper ring line L2 Lower ring line L10-L1n Network line WL West side line EL East side line A, a adder A1 -A3 adder H1 hybrid coil Tel telephone 100 connection station r1 to rn relay station T1, T2 terminal station 11 to 1n connection unit D1 to Dn extraction unit I1 to In insertion unit

Claims (4)

[Claims] 1. A 1 accommodated in an upper ring line (L1)
One master station (M) and multiple slave stations (S1 to Sn)
, One master station (m) and a plurality of slave stations (s1 to sn) accommodated in the lower ring line (L2), and a tributary station () connecting the upper ring line (L1) and the lower ring line (L2). A communication circuit for monitoring information of a network consisting of T), wherein the tributary station (T) is connected to the west side line (WL) of the lower ring line (L2), and the tributary west station (TW).
And a tributary east station (TE) having a configuration symmetrical to the tributary west station (TW) and connected to the east side line (EL) of the lower ring line (L2), the tributary west station (TW), tributary east station Station (T
E) is a separation unit (1W, 1E) that separates the overhead byte input from the west side line (WL) and the east side line (EL) into a signal of the order wire line for voice and a monitoring signal, and the separation unit (1W, 1E). ), A digital / analog conversion unit (2W, 2E) for converting a signal on the order wire line for voice, which is digital-to-analog, and a return unit (3W, 3E) for returning the supervisory signal separated by the separation unit (1W, 1E). ), And an analog / digital conversion unit (4W, 4E) for analog / digital converting a signal on the order wire line for voice
And a monitoring signal returned by the return section (3W, 3E) and the output of the analog / digital conversion section (4W, 4E) are multiplexed to form an overhead byte on the west side line (WL),
A communication circuit for monitoring information of a network, comprising: a multiplexing unit (5W, 5E) for outputting to an east side line (EL), wherein a monitoring signal is returned by the returning unit (3W, 3E). 2. The communication circuit for monitoring information of a network according to the preceding paragraph, wherein the folding section (3W, 3E) is provided with an OR circuit (31W, 31E).
E), the OR circuit (31W, 31E), the monitoring control unit (6
2. The result of monitoring the line and its own device by W, 6E) is added to the monitoring signal separated by the separating unit (1W, 1E) and is sent back by the OR circuit (31W, 31E). Communication circuit for monitoring information of the described network. 3. A plurality of network lines (L11 to L1)
n) and a connection station (100) including a connection unit (11 to 1n) for connecting a plurality of the network lines (L11 to L1n), the communication circuit for network monitoring information, comprising: 1n) is an extracting unit (D1 to Dn) that extracts a monitoring signal from the overhead bytes input from the connected network lines (L11 to L1n), and a monitoring extracted by the extracting unit (D1 to Dn). A loopback section (R1 to Rn) for looping back a signal, and an insertion section (I1) for inserting the monitoring signal looped back by the loopback section (R1 to Rn) into the overhead byte and outputting it to the connected network line (L11 to L1n). ~ I
n), and a network monitoring information communication circuit, characterized in that the network monitoring signal is looped back by the loopback section (R1 to Rn). 4. A master station (M) and a plurality of relay stations (r1 to rn) accommodated in a network line (L10).
And a communication circuit for network monitoring information comprising terminal stations (T1, T2) connected to both ends of the network circuit (L10), wherein the terminal stations (T1 to T2) are connected to the network circuit (L1). An extraction unit (D1, D2) for extracting a monitoring signal from the overhead bytes input from (L10); a folding unit (R1, R2) for folding back the monitoring signal extracted by the extraction unit (D1, D2); An insertion unit (I1, I2) for inserting the supervisory signal returned by the return unit (R1, R2) into the overhead byte and outputting it to the connected network line (L10) is provided, and the network supervisory signal is provided by the return unit. A communication circuit for monitoring information of a network, which is folded back at (R1 to Rn).