JPS61228750A - Management system of loop network - Google Patents

Abstract

PURPOSE:To recognize easily the relation of mutual position of each station by allowing each node station to make immediate response to a report request of the operating state from a trigger station so as to grasp quickly the state of each station. CONSTITUTION:The loop network consists of one trigger station 20 and plural node stations 21-23, the stations 21-23 are connected by a transmission line 24 in a loop, the trigger station 20 sends a polling signal to the transmission line 24 to apply transmission control to the node stations 21-23. As the management system of he loop network as above, the trigger station 20 sends a signal commanding the transmission of the operating state of the own to the node stations 21-23 through the transmission line 24, and after the node stations 21-23 receive the said signal and acquires the right of transmission, the stations sends the signal notifying the own operating state to the transmission line 24 and receives the signal notifying the operating state in the stations 21-23 sent succeedingly to the said signal.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a management method for grasping the operating status of trigger stations and node stations connected to a loop network.

(Prior art and its problems) In addition to the integration of voice communication and data communication, the 1988 IEICE exchange research study, There is a loop network described in ``A Study of High-Speed Synchronous Packet Loose'' in Conference Material 5E83-107.

This loop network constitutes a network as shown in FIG. 1, trigger station TS20 transmits a polling signal on transmission line 24 to node stations N521, N522, . N523
Performs polling control for.

Also, node stations N521, N522. N5
23 sends and receives packets via the transmission line 24 according to the polling control. These stations are loosely connected by a transmission path 24 as shown in the figure. (In this specification, a trigger station is abbreviated as TS, and a node station is abbreviated as NS, and TS and NS are collectively referred to as a station.) In Jin's loop network, as shown in FIG. Polling signal (pi or p2)
Each NS monitors the polling signal passing on the transmission path 24, prepares to transmit a packet, acquires the right to transmit the packet, and then transmits the packet. For example, in the example shown in FIG. 7, N521 receives the polling signal pi transmitted by TS20, acquires the transmission right after passing the polling signal pi, and transmits packet a1. After receiving the polling signal p1, N522 acquires the transmission right after passing the bucket)al and transmits the bucket)bl. Similarly, shite, N523
also transmits packet c1.

The TS 20 indicates with an umbrella the signal that is removed at each station in the polling signal that it transmitted. )
, and after passing the buckets) al, bl, cl sent by KNS21, N522, and N523, it acquires the transmission right and transmits the next polling signal p2, and N521
bucket) starts sending a2. In addition, each NS also removes the packet it transmitted from the transmission path 24 when it returns after going around the transmission path 24 . In this way, the transmitted signal is removed at the transmission source station after making one circuit around the transmission path 24.

As described above, in a loop network in which stations are distributed, it is important that one station, for example, the trigger station TS20 shown in FIG. 6, or all stations grasp the situation of the entire network. For example, the arrangement of node stations such as N521 adjacent to the downstream side of TS20 and N522 adjacent to the downstream side of N521, or frequency information of transmission errors on the transmission path 24 monitored by each NS,
In addition, the operating status of each NSK-accommodated terminal can be grasped (
4) You need to grasp it.

(Objective of the Present Invention) An object of the present invention is to provide a loop network management method that allows each station constituting the loop network to quickly grasp the status of the monitored transmission path or the status of the station itself.

(Structure of the Invention) According to the present invention, each of these stations is composed of one trigger station and a plurality of node stations, and each of these stations is connected in a loop through a transmission path, and the trigger station transmits a polling signal to the transmission path. A loop network management method for controlling transmission to the node station, wherein the trigger station transmits a signal to the transmission path instructing the node station to transmit its own operating state, and the trigger station After receiving the signal and acquiring the transmission right, the station transmits a signal on the transmission path notifying its own operating state, and receives a signal notifying the operating state within each of the stations transmitted following the signal. A loop network management method is obtained which is characterized by the following.

(Detailed description of the configuration) FIG. 1 is a block diagram showing the configuration of the TS 20 shown in FIG. 6, and FIG. 2 is a block diagram showing the configuration of the TS 20 shown in FIG.
FIG. 2 is a block diagram showing the configuration of N523.

When the access control unit 5 in the TS 20 shown in FIG. 1 receives an instruction to start transmitting a boring signal from the T8 control unit 7, it stores the polling signal in the transmission register 6 via the output 5-2 of the same unit. At the same time, the switch 1 is connected to the transmission register 6 side via the output 5-1 of the same section, and a polling signal is transmitted onto the transmission line 24. Once the TS 20 transmits the polling signal in this way, the FD detection unit 2 detects an end delimiter ED indicating the end of the signal passing through the transmission path 24.
Immediately after detecting the idle state of the transmission line 24, the idle state detection unit 3 detects the idle state of the transmission line 24, acquires the transmission right, and repeatedly transmits a polling signal. In addition, the reception control unit 4 receives the TS2 as described later.
It has the function of detecting and receiving signals sent to 0.

FIG. 3 shows a frame structure of a bowling signal transmitted by the TS 20 and each NS, or a signal between each NS.

These signals start with a signal start delimiter SD), a control field CF in which a bit string is written to identify whether it is a boring signal or a signal between each NS,
Destination address DA, source address SA, message part INFO.

It consists of an end delimiter ED indicating the end of the signal.

For the bowling signal sent by TS20, write the TS20's own address in SA, give a bit string to DA that would normally not be received by any NS, and prevent each NS from receiving the bowling signal into its own station. I'll make it like that.

The TS 20 sends this boring signal to the transmission path 24 every time it acquires the transmission right to start communication between each NS, but when you want to understand the operating status of each NS, a loop sense signal is used instead of the boring signal. The signal LS is set in the transmission register 6 and sent out. Boring signal or loop sense signal L
Identification as to whether the signal is S or not is made by the bit string of the control field CF of the signal frame shown in FIG. Also, the signal frame sent by each node station NS,
Alternatively, discrimination between the boring signal and the loop sense signal LS is also performed by the bit string of the control field CF.

In each NS shown in FIG. 2, when the polling signal detection unit 10 detects the boring signal transmitted from the TS 20, it starts controlling the transmission of transmission data stored in the transmission memory 12. That is, the NS control unit 8 notifies the access control unit 5' that the transmission data has already been stored in the transmission memory 12, and after the access control unit 5' receives the polling signal detection output from the boring signal 10, When the idle state detection section 3 detects the idle state of the transmission path 24 immediately after the signal passing through the transmission path 24 passes the end delimiter ED, it acquires the transmission right and transmits the transmission data in the transmission memory 12 via the selector 14. The data are sequentially stored in the register 6 and transmitted onto the transmission line 24. Also, the reception control section 4
has a function of detecting and receiving signals addressed to its own NS.

Each NS is further provided with an LS signal detection section 11, and the TS2
When detecting the loop sense signal LS from 0, the access control unit 5' controls the selector 14 based on this and stores the data in the status register 13 in the transmission register 6.

The status register 13 contains information indicating the operating status of the NS itself by the NS control unit 8, such as information indicating whether the NS itself can perform communication between NSs, information indicating whether the terminal it accommodates is capable of sending and receiving, or Frequency information of transmission errors on the transmission path 24 monitored by the reception control unit 4 is set.

(Example) Next, regarding an example of communication for configuring the loop network shown in FIG. 6 and for each station to identify the address of the adjacent stage section when starting the operation of this loop network, we will explain the signal shown in FIG. 4. This will be explained using the following flow.

TS20 is initially connected to the transmission line 24 (0'
X Sends a loop sense signal LS to the transmission line 24 instructing all NSs to transmit the address and operating status of each NS.

This LS signal is transmitted to NS2 adjacent to the downstream side of TS20.
1 is reached first. When the LS signal detection unit 11 shown in FIG. 2 inside the N521 detects the passage of this LS signal, it transmits this to the access control unit 5', and based on this, the access control unit 5' inside the N521 detects the passage of the LS signal after the passage of the LS signal. That is, the contents of the status register 13 are stored in the transmission register 6 via the selector 14. The frame structure of the signal in the transmission register 6 is the message part I NFO of the frame structure shown in FIG.
The contents of the status register 13 are stored in the CF.
A bit string indicating that the signal is transmitted by NS in response to the loop sense signal LS is written in DA, and TS2 is written in DA.
0 address, and the address of N521 itself is designated as SA. And when N521 acquires the transmission right,
The signal STI in the transmission register 6 is sent out.

N522 and 23 also show their own operating status etc. in the same way:
(to)'7 Signal ST2. Send ST3. At this time, TS2
0. FIG. 4 shows the flow of signal frames at the output end on the transmission path 24 of N521, 22.23. The blocks indicated by umbrella marks in this figure indicate the positions of the respective signal frames that are removed from the transmission line 24 at the transmitting station after going around the loop-shaped transmission line 24.

TS20 transmits the loop sense signal LS to the transmission line 2.
In this case, when the transmission right is acquired after removing 4 and 4, the polling signal P is transmitted after the signal ST3 transmitted by the most downstream N523 has passed. Normal inter-NS communication is started from Nire K, and the communication state returns to the state shown in FIG.

Loop sense signal LS and signal STI, ST2°Sr3
Since the address of the TS 20 is fixed in the destination address DA of the TS 20, the reception control unit 4 of the TS 20 has
These signal frames are received as shown in a). This allows the TS 20 to know the positional relationship and operating status of each NS.

The method for the TS20 to grasp the status of each NS has been described above, but the loop sense signal LS and the signals STI, S
T2. If a broadcast address is used as the destination address DA of ST3, all stations will be able to receive
K signal frame sequences can be received. Then, each station learns the addresses of the stations adjacent to its own upstream and downstream sides by checking the SA parts of the signals before and after the signal with its own SA among the signals received by the reception control unit 4. Can be done.

For example, N522 identifies a signal having an SA part equal to its own address from among the received signals, that is, Sr1, and then extracts the SA part of the received signal STI, that is, the address of N521. From this, it can be known that N521 is adjacent to the upstream side of the self, and by extracting the SA part of the signal ST3 received after the signal ST2, that is, the address of N523, there is N523 on the downstream side of the self. We can know that and are adjacent to each other.

(Effects of the Invention) Since each node station immediately responds to a request to report its operating status from the node, the status of each station can be quickly grasped. Furthermore, by recognizing the order of response signal frames sent by each node station, it is possible to know the mutual positional relationship of each station.

[Brief explanation of drawings]

FIG. 1 is a diagram showing the configuration of trigger stations that make up the loop network, FIG. 2 is a diagram showing the configuration of the node stations that make up the loop network, and FIG.
The figure shows the frame structure of the signals transmitted by the trigger station and the node station, FIG. 4 shows the flow of signals when the present invention is implemented, and FIG. 5(a)
, (b) is a diagram showing signals received by each station when the present invention is implemented, FIG. 6 is a diagram showing the configuration of a loop network, and FIG. 7 is a diagram showing the flow of signals. In the figure, 1 is a switch, 2 is an ED detection section, 3 is an idle state detection section, 4 is a reception control section, 5.5' is an access control section, and 5-
1, 5'-1, 5-2, 5'-2 are the outputs of the circuit,
6 is a transmission register, 7 is a TS control section, 8 is a NS control section,
10 is a polling signal detection section, 11 is an LS signal detection section,
12 is a transmission memory, 13 is a status register, 14 is a selector, 20 is a trigger station, 21, 22, 23
denotes a node station, and 24 denotes a transmission path.

Claims (1)

[Claims] A loop network consisting of one trigger station and a plurality of node stations, each of which is connected in a loop through a transmission line, and the trigger station transmits a polling signal to the transmission line to control transmission for the node station. In the management method, the trigger station transmits a signal to the transmission path instructing the node station to transmit its own operating state, and the node station acquires the transmission right after receiving the signal. A loop network management method characterized in that a signal notifying the operating state of each station is transmitted on the transmission path, and a signal notifying the operating state within each of the stations transmitted subsequent to the signal is received.