JPH0323734A - Connection route establishing system - Google Patents

Abstract

PURPOSE:To correctly perform the connection/disconnection of a connection route by deciding the connection or the disconnection of a master station connection line temporarily with the control signal of a layer, and further, deciding the connection or the disconnection with the detected result of polling on the layer. CONSTITUTION:The presence/absence of a line set at an activated state is decided by monitoring the control signal 3 received at every line, and when activated lines exist, one of them is decided temporarily as the master station connection line and the polling from a main station 1 is awaited. The decision for the presence/absence of the polling is performed for prescribed time, and another line is assumed as a slave connection line,a nd an activated control signal 3 is sent out, then, the master station connection line is established. Meanwhile, the control signal 3 of the master station connection line is monitored, and the activation/inactivation of the signal is decided, and the judgement for the presence/absence of the polling is awaited when the signal is set at an inactivated state, and the inactivated control signal 3 is sent to the slave station connection line by assuming no polling as the disconnection of the master station connection line, then, the master station connection line is disconnected. Thereby, it is possible to maintain the stable setting of a route against the fault in the line or an error in a slave station.

Description

[Detailed Description of the Invention] [Field of Industrial Application] The present invention is used for route control of a multi-link network, and is particularly applicable to layer 1 and layer 2 according to the ISDN system.
This invention relates to a method for establishing a connection route in a multilink network having a communication procedure.

〔overview〕

The present invention provides a connection method in a multi-link network that includes a plurality of slave stations connected in a link form through lines and one main station that monitors and controls these slave stations, and has layer 1 and layer 2 communication procedures. In the route establishment method, the slave station tentatively determines whether to establish or disconnect the master station connection line depending on whether the control signal in layer 1 is in a significant state or in a non-significant state, and determines whether to establish or disconnect the master station connection line depending on whether there is polling in layer 2. By treating this as establishing or disconnecting a line, it is possible to easily and accurately establish or disconnect a connection route.

[Conventional technology]

Conventionally, this type of connection route establishment method has been realized by defining control signals for determining a master-slave relationship in layer 1 between adjacent slave stations (nodes).

For example, as shown in FIG. 1(a), a connection path establishment method in a multilink network comprising a master station 1 and a plurality of slave stations 2 is as follows.

In the steady state, each slave station 2 receives the control signal 3 in the "r on" state from the master station route and transmits the control signal 3 in the "off" state. Control signal 3 in “off” state in slave route
and transmits a control signal 3 in the "on" state. After this master-slave relationship is established between each slave station 2, layer 2 communication is started from the master station 1 using a polling/select method.

Strategy setting itself is a layer 3 function, but for simplicity and speed of establishment, the control signal 3 at the layer 1 level is
This is realized by

In the procedure of each slave station 2, the procedure for establishing a connection route is
The procedure for disconnecting the connection route is shown in Figure 3 (b).
).

According to FIG. 3(a), the procedure for establishing a connection route in the slave station 2 is to monitor the control signal 3 received on each line (step S21), and determine the presence or absence of a line in which the control signal 3 is "on" (step S21). (Step S22), r on'
If there is a line in the "on" state, one of them is determined to be the main station connection line (step S23), and a control signal 3 in the "on" state is sent to all lines other than the line in question (step S2).
5) to establish a connection route.

According to FIG. 3 (b), the procedure for disconnecting the connection route in the slave station 2 is to monitor the control signal 3 of the master station connection line (step 331), and turn the control signal 3 on or off.
If it is in the "off" state, the process returns to step 331; if it is in the "off" state, it is assumed that the master station connection line has been disconnected, and the slave station connection line is connected to the slave station connection line.
Send control signal 3 in "off" state (step S33)
This allows the connection route to be disconnected.

[Problem that the invention seeks to solve]

The conventional connection route establishment method described above is determined only by "on" or "off" of the control signal 3 in layer I, so if a line failure occurs or some slave stations fail, the control signal is If the signal regulations in Section 3 are not followed, a connection route based on an incorrect master-slave relationship will be established, and layer 2 polling and
There are drawbacks such as the inability to implement select communication and the repeated disconnection and establishment of settings due to the master-slave relationship of connection routes.

An object of the present invention is to provide a connection route establishment method that can correctly establish and disconnect a connection route by eliminating the above-mentioned drawbacks.

[Means for solving problems]

The present invention provides a connection route establishment method in a multilink network that includes a plurality of slave stations connected by lines and one main station that monitors and controls these slave stations, and has layer 1 and layer 2 communication procedures. In the slave station, the slave station tentatively determines whether to establish or disconnect the master station connection line depending on whether the control signal in layer 1 is in a significant state or in a non-significant state, and establishes or disconnects the master station connection line depending on whether polling is performed in layer 2. It is characterized by including a simple route establishment means that is regarded as a disconnection.

[Effect]

The simple route establishing means does not decide whether to establish or disconnect the main station connection line based on the control signal in layer 1, but makes a tentative decision, and then monitors the presence or absence of polling in layer 2 for a certain predetermined time, and based on the result. A decision is made as to whether to establish a route or disconnect the route.

Therefore, route establishment or disconnection is confirmed based on the presence or absence of polling in layer 2, and it becomes possible to accurately establish or disconnect a route. Moreover, since the route setting is completed at the layer 2 stage, it can be carried out more easily than by regular procedures.

〔Example〕

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

FIGS. 1(a) and 1(b) are block diagrams showing one embodiment of the present invention; FIG. 1(a) shows the system structure, and FIG. 1(a) shows the structure of the slave station.

This embodiment is a multi-link link that includes a plurality of slave stations 2 connected in a link form by lines and one main station 1 that monitors and controls these slave stations 2, and has layer 1 and layer 2 communication procedures. In the connection route establishment method in the network, the slave station 2, which is a feature of the present invention,
Control signal 3 in layer 1 is “on” or “off”
It includes a simple route establishing means 2a which tentatively determines establishment or disconnection of the main station connection line depending on the state, and considers the establishment or disconnection of the main station connection line depending on whether there is polling in layer 2.

Next, the operation of this embodiment will be explained with reference to the flowcharts shown in FIGS. 2(a) and 2(b). Here, Figure 2 (
A) shows the state when the main station connection line is established, and FIG. 2(b) shows the state when it is disconnected.

According to FIG. 2(a), the establishment of the main station connection line in this embodiment is performed as follows. First, the control signal 3 received on each line is monitored (step S1), and it is determined whether there is a line for which the control signal 3 is in the "on" state (step S2). If there is no line in the "on" state, return to step 1, and if there is a line in the "on" state, that one line is tentatively determined as the main station connection line and polling from the main station 1 is performed. Wait (step 33). Then, the presence or absence of polling is determined (step 34). The time taken for this polling detection is regulated to a predetermined time by, for example, a timer. In addition, if there is no polling,
The presence or absence of the other control signal 3 in the "on" state is determined (step S8), and if it is absent, the process returns to step S2, and if it is present, it is tentatively determined to be the main station connection line (step S9>, and the process returns to step S4). If it is determined in step S4 that there is polling, it is determined that the line is the master station connection line, and in step S5, the other line is regarded as the slave connection line, and is turned on.
By sending the state control signal 3 (step 36),
The main station connection line is established.

According to FIG. 2(b), the disconnection of the main station connection line in this embodiment is performed as follows. First, the control signal 3 of the main station connection line is monitored (step 311), and it is determined whether the control signal 3 is "on" or "off" (step S12), and if it is in the "on" state, step Sl
Return to l, wait for polling if in "off" state,
The presence or absence of polling is determined (step S13). Also in this case, the time spent on polling detection is regulated by a timer.

If there is polling, the process returns to step 311, and if there is no polling, it is assumed that the main station connection line has been disconnected, and a control signal 3 in the "off" state is sent to the slave station connection line (step S14). Line disconnection is complete.

That is, in this embodiment, a line receiving the control signal 3 in the "on" state is searched for and tentatively determined to be the main station connection line. In the conventional method, this procedure is considered as establishment, but in the case of this method, the establishment of layer 2 communication with or without polling is considered as route establishment.

Also, regarding the main station connection line, it monitors whether the control signal 3 is in the "off" state, and if it is in the "off" state, it is assumed that there is a fault in the main station connection line, and polling is further monitored, and if the control signal 3 is in the "off" state, it is assumed that the main station connection line has failed. If the main station connection line is disconnected,
The slave connection line is notified by leaving the control signal 3 in the "off" state.

〔Effect of the invention〕

As described above, the present invention includes not only the layer 1 procedure but also the layer 2 procedure in the route establishment and disconnection procedure, thereby providing protection for the strategy setting establishment and disconnection operation. This has the effect of maintaining stable route settings in the event of line failures on the network or slave station (node) failures.

[Brief explanation of drawings]

1 is a block diagram showing an embodiment of the present invention shown in FIGS. 1(a) and 1(b); FIG. FIGS. 2(a) and 2(b) are flowcharts showing the operation. FIGS. 3(a) and 3(b) are flowcharts showing the operation of the conventional example. DESCRIPTION OF SYMBOLS 1... Main station, 2... Slave station, 2a... Simple route establishment means, 3... Control signal, S1-39, Sll-S15
, S21=S25, S31-S34...step. Patent Extraction NEC Corporation

Claims (1)

[Claims] 1. Connection in a multilink network that includes a plurality of slave stations connected by lines and one main station that monitors and controls these slave stations, and has layer 1 and layer 2 communication procedures. In the route establishment method, the slave station tentatively determines whether to establish or disconnect the master station connection line depending on whether the control signal in layer 1 is in a significant state or in a non-significant state, and the slave station tentatively determines whether to establish or disconnect the master station connection line depending on whether the control signal in layer 1 is in a significant state or not. A connection route establishment method characterized by including a simple route establishment means that is regarded as establishing or disconnecting a connection line.