JPS6051044A - Loop system transmission processing device - Google Patents

Abstract

PURPOSE:To perform loop back switching without depending on simultaneous processing of transmission and reception by fetching an input cut-off detection signal, a loop back input cut-off detection signal etc., giving circuit switching command and loop control switching command and providing a CPU that sends out transmission data. CONSTITUTION:When there is a signal input cut-off detection signal, the CPU of a primary station A1 gives command to a circuit switching circuit 6 to connect a loop back input line CIN and a loop control input line DIN. When there is no signal input cut-off detection signal but there is a loop back input cut-off detection signal, circuit is switched 6 to connect a loop control output line DOUT and a loop back output line COUT. When there is no input cut-off detection signal and loop back input cut-off detection signal, circuit is switched 6 to connect the input line CIN and output line COUT. The CPU of secondary stations A2, A3...AN make circuit switching 6 accordingly, and consequently, loop back switching can be performed even when simultaneous processing of transmission and reception is not performed.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a loop-type transmission processing device in which each station does not have a frame buffer.

In a conventional loop type transmission processing device, a station that detects a break in a signal line sends a loopback command to a station that detects a break in the signal line. 9? The occurrence of a line was notified by a signal.

The station that issues the loopback command receives the signal.

A loopback command was sent to all stations and a single line was switched.

However, in such a conventional example, each station must be able to transmit and receive signals at the same time, and there is a problem that processing cannot keep up with high-speed transmission.

Therefore, it is an object of the present invention to provide a loop-type transmission processing device that can perform loop bank switching without performing simultaneous transmission and reception processing.

The loop-type transmission processing device of the present invention connects a plurality of transmission stations in a loop shape in one direction by a signal line and in a loop shape in the other direction by a loopback line, and connects any one of the plurality of transmission stations in a loop shape in the other direction. This is a loop-type transmission processing device in which the primary station has transmission rights and supervisory rights for the line, and the remaining transmission stations serve as secondary agents.

The plurality of transmission stations each include a signal input cutoff detection circuit and a loopback input cutoff detection circuit that detect the cutoff of the signal line input and the loop bank line input, respectively, and generate a signal input cutoff detection signal and a loopback input cutoff detection signal. ,
A loop control circuit that connects and connects a loop control input line and a loop control output line.

Signal input line, signal output line, loopback input line.

a line switching circuit that switches connection states of a loopback output line, a loop control input line, and a loop control output line; a receiving unit that receives received data from the loop control input line;
a transmitting means for sending transmission data to the loop control output line; and a receiving means for taking in a signal input cutoff detection signal from the signal input cutoff detection means and a loop bank input cutoff detection signal from the loopback input cutoff detection means. and a central processing unit that receives received data from the transmitter and gives a line switching command to the line switching circuit, and also gives a loop control switching command to the loop control circuit and sends transmission data to the transmitting means.

- The central processing unit of the next station issues a loop control switching command to the loop control circuit so that the loop control input line and the loop control output line are initially disconnected, as shown in FIG. and the signal input line and the loop control input line are connected, the loop control output line and the signal output line are connected, and the signal input line and the loopback output line are connected. A line switching command is given to the line switching circuit so that after transmitting a data frame, a monitoring timer is started, an idle frame is then transmitted, and upon receiving this idle frame, the monitoring timer is stopped, The line switching means disconnects the signal input line and the loopback output line and connects the loopback input line and the loop control input line if the signal input cutoff detection signal is present when the monitoring timer times up. A line switching command is given to the line switching command, and if the signal input cutoff detection signal is not present but the loopback input cutoff detection signal is present, the signal input line and the loopback output line are disconnected, and the loop control output line and the loopback output line are disconnected. A line switching command is given to the line switching means to connect.

If there is no both the signal input cutoff detection signal and the loopback input cutoff detection signal, the signal input line and the loopback output line are disconnected, and the loopback input line and the loopback output line are connected. A line switching command is given to the line switching means, and after one line is switched, a loop command is sent to the transmitting means.

As shown in FIG. 14, the central processing unit of the secondary station issues a loop control switching command to the loop control circuit so that the loop control input line and the loop control output line are initially connected. and the signal input line and the loop control input line are connected, the loop control output line and the signal output line are connected, and the loop check input line and the loopback output line are connected. A line switching command is given to the line switching circuit so that the line switching circuit becomes A loop control switching command is given to the loop control circuit to disconnect the control input line and the loop control output line, and the loop disconnect input line and the loopback output line are disconnected, and the loopback input line is disconnected. and giving a line switching command to the line switching circuit to connect the line and the loop control input line,
After that, sending a flag to the sending means, and then stopping sending the flag in response to receiving the loop command;
and a loop control switching command is given to the loop control circuit to connect the loop control input line and the loop control output line, and at least one of a signal input cutoff detection signal and a loopback input cutoff detection signal is present. In this case, a line switching command is given to the line switching circuit to connect the loop control output line and the loopback output line in the absence of a signal input cutoff detection signal.

An embodiment of the present invention will be described based on the drawings.

As shown in FIG. 1, this loop-type transmission processing device connects a plurality of transmission stations Al-AN through a signal line B and a loopback line C in a loop. Signal line B is connected to the signal output terminal of each transmission station A~AN and adjacent transmission stations A2~AN, A
Connect the signal input terminals of □ and loop back mC.
connects the loopback output terminals of each transmission station A□ to AN and the loopback input terminals of adjacent transmission stations AN and A to AH-□, respectively.

Among the multiple transmission stations A□ to AM, the station that has the right to transmit and supervise the line (it is located at I'i80 in the figure, but any station can become the next station) is called the -next station; stations (A2-A
N) is called a secondary station.In order to synchronize one line in this loop-type transmission processing device, the -next station's transmitting clock and receiving clock are not the same, but the transmitting clock is unique to its own station, and the receiving clock is extracted from the received signal. On the other hand, in the secondary mode, the transmitting clock and the receiving clock are the same, and both are extracted from the received signal. Furthermore, as for the secondary signal, the received signal is sent out as a transmitted signal with almost no delay (if any, a few bits) (at the time of reception).

In the primary station, under normal conditions, the signal input end and signal output end are disconnected, the loopback input end and loop pack output end are disconnected, and the signal input end and loopback output end are connected. Ru. Further, in the secondary state, the signal input end and the signal output end are connected, and the loopback input end and the loopback output end are connected during normal operation.

FIG. 2 is a block diagram showing a specific configuration of the transmission devices A to AN. In FIG. 2, 1 is a central processing unit (hereinafter referred to as CPU), and 2 is an input cutoff detection circuit that detects that there is no longer a signal change in the signal input a BIN and provides a signal input cutoff detection signal to the CPU 1.

Reference numeral 3 denotes an input cutoff detection circuit that detects that there is no longer a change in the signal on the loop bank input line CIH and provides a loopback input cutoff detection signal to the CPU. 4 is CPU 1
The loop control input lineman responds to the loop control switching command given by the loop control input lineman, and performs waveform shaping on the signal to generate the loop control output lineman. Output from UT (loop mode set) Loop control input line and loop control output line. A loop control circuit that switches between disconnecting from the UT (loop mode release), a waveform shaping circuit that shapes the signal of the five waveform shaping input lines E and N and outputs it as a waveform shaping output 1liIEoUT;
6 is a signal input line BIN, a signal output line B()UT, an A/-F/(tsuku input line C, a loopback output line C8U, and a loop control input line D) in response to a line switching command from the CPU 1. 8. Loop control output line. UTI waveform shaping input line "IN" and waveform shaping output line E. This is a line switching circuit that switches the connection state with UT.

7ij is a DPLL circuit that extracts signals from the loop control input #DI, and 8 is a reception register that stores received data from the loop control input line DxN based on the clock extracted by the DPLL circuit 7.

9 is a comparator that compares the own station address set by the CPU] with the destination address in the received data stored in the receive register 8; This is a sign testing circuit that tests the sign of signal data. Reference numeral 11 denotes a receiving register to which the received data of the receiving register 8 is transferred when a coincidence output is generated from the comparator 9, and the data is taken in by the CPUIK at a predetermined timing. ]2 is a transmission register that stores transmission data output from the CPU 1. 13 is a DPLL based on the loop control switching signal input via the loop control circuit 4.
A clock switching circuit that switches and outputs the clock extracted by the circuit 7 and the unique clock.If it is a -next station, the unique clock is selected as the transmitting link, and if it is between the two stations, it is extracted by the DPLL circuit 7. The selected clock is selected as the transmit clock. 14t'i In response to the loop control switching signal inputted through the loop control circuit 4, the transmission data of the transmission register 12 is loaded, and the transmission data is read based on the transmission clock from the relay switching circuit 13. This is a transmit register that sends data to the loop control output line DoUT. This is a test code adding circuit that adds a test code to the transmission data output from the 1st'i transmission register.

Next, the operation of this loop type transmission processing device will be explained based on FIGS. 3 to 12.

First, the transmission and reception processing of the primary station will be described.

- As shown in Figure 3, the next station transmits a data frame, then determines whether all data frames have been transmitted, and if NO, that is, if there are still data frames left to transmit, the next station transmits the data frame. If the answer is YES, that is, if the transmission of all data frames has been completed, a flag is subsequently transmitted and a monitoring timer is started. Then, it is determined whether the transmission data has completed one cycle, and if NO, the above determination is continued.

If the monitoring timer times up during this period.

It is regarded as a failure and moves to failure processing. If the determination result of the above transmission data cycle is YES, then an idle frame is transmitted, then data is received from the secondary agent, and then it is determined whether or not an idle frame has been received.
In this case, data reception from the secondary agent is repeated again. When signal line disconnection a occurs.

An idle frame cannot be received and the watchdog timer generates a time amplifier. When this time-up occurs, it is assumed that a signal line disconnection has occurred, and disconnection processing (loop bank switching processing) is performed. If an idle frame is received before the monitoring timer times up, the disconnection process that stops the monitoring timer and ends the program is performed in response to the monitoring timer's time-up. Depending on the presence or absence of the signal input cutoff detection signal from the detection circuit 2, the signal input iB engineer determines whether or not a signal cutoff has occurred in the previous section.If YES, the fifth cause is determined from the state shown in Figure 5. If the answer is No, the signal is interrupted at the front part of the loopback input line C depending on the presence or absence of the loopback input interruption detection signal from the input interruption detection circuit 3. Determine whether it has occurred. If this judgment result is YES, the state of the prisoner shown in Fig. 5 (
The line is switched to the state of pattern (2) in C), and if the above judgment M is NO, the line is switched from the state of the prisoner in Figure 5 to the state of pattern (3) in Figure 5 (seasonal pattern). .and,
After this line switching, a loop command (loopback switching finger 4) is transmitted to all secondary agents in the same way as data frame transmission. Note that the loop mode determined by the loop control switching command remains canceled.

FIG. 5(4) shows the initial line connection state at the -next station, where the loop control circuit 4 is connected to the loop control input line DIN and the loop control output line. 1 circuit switching circuit 6 connects the signal input line B, the loop control input line D, and the loop control output aDo, T to the signal output line B. UT, signal input line B, and waveform shaping input #E
xN is connected to the waveform shaping output 1lJEoUT and the loopback output line C3UT, respectively.

In the line connection state of FIG. 5(B), the loop IJli! 1
1 circuit 4 connects the loop fjU input aD, the loop control output line DOIJT and the signal output l5BOUT, and the loop back input #CIN and the loop control input line D, respectively. In the line connection state, the loop control circuit 4 connects the loop control input line DIN and the loop control output line DOU.
1 line switching circuit 6 connects the signal line BIN and the loop control input line DIN to the loop control output line DOUT.
and signal output line B. U, and loop control output line Dol]
T and the loopback output line C3UT are respectively connected.

Fifth factor (in the line connection state of D, the loop control circuit 4 connects the loop control input M DIIJ and the loop control output line DoUT
and signal output line B. Loop back human power line CIN with UT
and the waveform shaping input line EIN, and the waveform shaping output line E. U.T.
and loopback output line C6UT are connected to each other.

Next, processing for disconnection of the secondary agent will be described. The secondary agent disconnection process is started in response to the occurrence of either a signal input cutoff or a loop bank input cutoff, and as shown in FIG. It is determined whether a signal interruption has occurred in the part before the signal line BIN, and if YES, the line is switched and the loop mode is canceled, and the state from the prisoner state in Figure 8 to the state in Figure 8 (Oil state) is determined. The line connection state is changed, and the flag is transmitted using the own station's own clock switched by the clock switching circuit 13 as the transmission clock.

Next, it is determined whether the signal input cutoff has been restored (signal change occurs again on signal input line B), and the first determination result is NO.
If the loop command is received, it is determined whether or not, and if the determination result is No, the above two types of determination are repeated,
If the result of the signal input cutoff recovery determination is YES, one line switching recovery is performed, flag transmission is stopped, and the loop mode is set.

Further, when the result of the loop command reception determination is YES, flag transmission is stopped and the loop mode is set. As a result, the line connection state changes from the state shown in FIG. 8 (8) to the state shown in FIG. 8 (Q). If the result of the signal input cutoff determination is No (loopback input cutoff)
The line is switched from the state shown in FIG. 9 to the state shown in FIG. 9 (CB).

As shown in FIG. 7, the secondary side performs line switching and recovery when the loopback input is interrupted and recovered (a signal change occurs again on the loopback input line C).

Note that if a signal input cutoff and a loopback input cutoff occur at the same time, priority is given to the processing for the signal input cutoff.

Figures 8(a) and 9(a) show the initial line connection state of the secondary plane, in which the loop control circuit 4 connects the loop control input line D and the loop control output HDoUT (loop mode), line switching. The circuit 6 connects the signal input line B and the loop control input DIN, the loop control output line DOUT and the signal output line B.UT, the loopback input line C and the waveform shaping input line EIN, and the waveform The shaping output lines E. and T are connected to the loopback output line C6U, respectively.

In the line connection state of FIG. 8(B), the loop control circuit 4 disconnects the loop control input line DIR and the loop control output line DOUT to release the loop mode) 1) The line switching circuit 6 disconnects the signal input line BIN and the loop control input line Connect the line DIN to the loopback input line, CIN and the loop control input line DIN to the loop control output line. Connect UT and the signal output line BOUT, respectively, and set the loopback output line CoUT to no potential to eliminate the signal. .

FIG. 8 (In the line connection state of Q, the loop control circuit 4 connects the loop control input line D and the loop control output line DOUT.
If the line switching circuit 6 is connected to the loop mode center), the line switching circuit 6 is in the same state as in FIG. 8(B).

In the line connection state of () in Fig. 9, the loop control circuit 4 connects the loop control input line D and the loop control output line DoUT. Input line D 1, and.

Loop control output #jDoUT and signal output line B. UT and loop control output line. UT and loopback output line C6
Connect 7 and t respectively.

Next, the disconnection processing operation of the primary station and the secondary plane in this loop type transmission processing device will be explained chronologically with reference to FIGS. 10 to 12. However, in the following explanation, it is assumed that four transmission stations A, ~A, constitute a loop type transmission processing device, and the transmission stations 〇 is the primary station, and the transmission stations A2 ~A are the primary stations.
Assume that 4 is a quadratic surface.

First, a case will be described in which a signal line disconnection occurs at a location other than on both sides of the -next station.

As shown by the X mark in FIG. 10 (4), transmission station A3
If a disconnection occurs in the middle of signal line B from to transmission station A4, the signal input to transmission station A4 is cut off, and transmission station A
The line connection state of A4 changes as shown in FIG. 10 (6), and transmission station A4 transmits a flag. As a result, the loopback input to the transmission station A3 is cut off, and the line connection state of the transmission station A3 changes as shown in FIG. 10 CB). As a result, the input cutoff detection circuit 2.3 of transmission station A does not operate, but since idle frames are no longer sent to transmission station A, the monitoring timer at transmission station A times up. As a result, transmission station A□ starts disconnection processing, but since neither input cutoff detection circuit 2.3 is outputting an input cutoff detection circuit, the line connection state of transmission station A0 is 10th.
The process changes as shown in Figure (C), and a loop command is sent to and from all stations. As a result, this loop command is received by transmission station A4, and the line connection status of transmission station A4 is changed as shown in FIG.
It changes like the season and the loopback is completed.

Next, a case will be described in which a signal line disconnection occurs on both sides of the -next station.

As shown by the X mark in FIG. 11(a), transmission station A4
If a disconnection occurs on the signal line B from the transmission station to the transmission station ○, the signal input to the transmission station ○ is cut off, and therefore the loopback input to the transmission station A4 is cut off. As a result, the line connection state of transmission station A4 changes as shown in ) in FIG. Also, since no idle frame is input to transmission station A□, after transmission station A4 switches as shown in Figure 11), the monitoring timer of transmission station A times up, and transmission station A1 starts disconnection processing. do. In this case, since the signal input is cut off, the line connection status of transmission station A is
The loop bank is completed by changing as shown in Figure 1 (Q).Although the loop command is also sent, it will be received by itself.

As shown by an changes as shown in Figure 2 (6),
Transmission station A2 transmits 7 lags. As a result, the input cutoff detection circuit 2.3 of the transmission station A does not operate, but since the idle frame -/JE is not sent to the transmission station for 0, the monitoring timer performs time amplification for the transmission station 0. From this K, transmission station A□ starts disconnection processing. At this time, the loopback input to ○ is cut off to the transmission station, so the line connection status of transmission station A changes as shown in Figure 12 (Q), and the loop command is sent to all stations.As a result .

Transmission station A receives this loop command, and
The line connection state changes as shown in FIG. 12 (6), and loopback is completed.

As a result of this configuration, loopback switching can be performed without performing simultaneous transmission and reception processing.

As described above, the loop-type transmission processing device of the present invention has the advantage that loopback switching processing can be performed even if simultaneous transmission and reception processing cannot be performed.

[Brief explanation of drawings]

FIG. 1 is a block diagram of a loop-type transmission processing device according to an embodiment of the present invention. FIG. 2 is a detailed block diagram of each transmission station, FIG. 3 is a flowchart showing primary side transmission and reception processing,
The figure is a flowchart showing the primary side disconnection process, Figure 5 is an explanatory diagram of the primary side line switching, Figure 6 is a flowchart showing the secondary agent disconnection process, and Figure 7 is the secondary agent disconnection recovery process. The flowchart shown in FIG. 8 and FIG. 9 is an explanatory diagram of the secondary agent line switching, respectively, and FIGS. 10, 11, and 12 are explanatory diagrams showing the flow of the loopback switching process, and FIGS. FIG. 14 is a functional block diagram of each central processing unit. A□~AN...Transmission station, B...Signal line, C...Loopback line, 1...Central processing unit, 2, 31 Input cutoff detection circuit, 4...Loop control circuit, 5... Waveform shaping circuit. 6... Line switching circuit, 7... DPLL circuit, 8...
・Reception register, 9...Comparator, 1o...Sign verification circuit, 1]...Reception register, 12...Transmission register, ]3...Cronk switching circuit, 14 River transmission register,
15... Verification code addition circuit, B engineering N... Signal Kuga line,
BooT river signal high signal output line,...loop bank incoming line, coU,...loopback output line, D,...loop control output line, DoUT...loop control output line -E
IIIJ River waveform shaping input line, EOTJ'1...Waveform shaping output line 3 Figure 1 Figure 8 Figure °9 Figure CA1 (B) Figure 10 Figure 11 A3 (C) Figure (A) Figure 121 (C ) 1 (D) Figure

Claims (1)

[Claims] A plurality of transmission stations are connected in a loop in one direction by a signal line and connected in a loop in the other direction by a loopback line, and any one of the plurality of transmission stations is given the transmission right of the line. This is a loop-type transmission processing device in which a primary station has supervisory authority over 1 and η, and the remaining transmission stations are secondary stations. The plurality of transmission stations each include a signal input cutoff detection circuit and a loopback input cutoff detection circuit that detect the cutoff of a signal line input and a loopback line input, respectively, and generate a signal input cutoff detection signal and a loopback input RM detection signal. ,
A loop control circuit, a signal input line, a signal output line, and a loopback input line that connect the loop control input line and the loop control output line. a line switching circuit that switches connection states of a loopback output line, a loop control input line, and a loop control output line; a receiving unit that receives received data from the loop control input line;
a transmitting means for transmitting transmission data to the loop control output line; and a receiving means for taking in a signal input cutoff detection signal from the signal input cutoff detection means and a loopback input cutoff detection signal from the loopback input cutoff detection means. and a central processing unit that receives received data from the transmitter and provides a line switching command to the line switching circuit, and also provides a loop control switching command to the loop control circuit and transmits transmission data to the transmitting means. - The central processing unit of the next station gives a loop control switching command to the loop control circuit so that the loop control input line and the loop control output line are initially disconnected, and the signal input line and the loop control input line are connected, the loop control output line and the signal output line are connected, and the signal input line and the loopback output line are connected. A line switching command is given to the switching circuit, a monitoring timer is started after transmitting a data frame, an idle frame is then transmitted, the idle frame is received, and the monitoring timer is stopped, and when the monitoring timer times up, If the signal input cutoff detection signal is present, a line switching command is given to the line switching means to disconnect the signal input line and the loopback output line and connect the loop bank input line and the loop control input line. , when the signal input cutoff detection signal is not present and the loopback input cutoff detection signal is present, the signal input line and the loop bank output line are disconnected, and the loop control output line and the loop bank output line are connected to the line. A line switching command is given to the switching means, and if both the signal input cutoff detection signal and the loopback input cutoff detection signal are not present, the signal input line and the loopback output line are disconnected, and the loopback input line and the loopback output are disconnected. A line switching command is given to the line switching means to connect the line to the line, and after one line switching, a loop command is sent to the transmitting means. A loop control switching command is given to the loop control circuit so that the control input line and the loop control output line are connected, and the signal input line and the loop control input line are connected and the loop control circuit is connected. A line switching command is given to the line switching circuit so that the control output line and the signal output line are connected and the loopback input line and the loopback output line are connected, and the signal input cutoff detection signal and When there is at least one of the loopback input cutoff detection signals, if there is a signal input cutoff detection signal, the loop control circuit is controlled to disconnect the loop control input line and the loop control output line. giving a switching command to the line switching circuit to disconnect the loopback input line and the loopback output line and connect the loopback input line and the loop control input line; Thereafter, the loop control circuit sends a flag to the transmitting means, and then stops transmitting the flag in response to reception of the loop command, and connects the loop control input line and the loop control output line. When a loop control switching command is given to , and at least one of the signal input cutoff detection signal and the loopback input cutoff detection signal is present at t5, if there is no signal input cutoff detection signal, the loop control output line and the loopback output line A loop type transmission processing device configured to give a line switching command to the line switching circuit to connect the line switching circuit.