JPS58121840A - Monitor system for communication line between devices - Google Patents

Abstract

PURPOSE:To monitor incoming and outgoing communication lines at a master device, by providing a monitor function of pilot reception from a slave device to the master device, and providing a function transmitting an incoming pilot representing the state of the outgoing communication line from the master device to the slave device. CONSTITUTION:If the outgoing communication line is failed, a pilot is distinguished at 6. When timeout of a timer T1 takes place at 7, since no outgoing pilot is received from the slave device within the time T1, a pilot B representing the failure of the outgoing communication line is transmitted and the master device discriminates the outgoing communication line failure at 8. When the incoming communication line is failed, the incoming pilot is distinguished at 9. The master device monitors the incoming pilot at a timer T2, and when a timer T2(T1<T2) has timeout at 10, it is discriminated as the failure of the incoming communication failure.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention enables one device to collect the monitoring results of communication lines in both directions in a device having an inter-device communication line, and applies a threshold to a device threshold amortization monitoring method.

Conventionally, in this type of monitoring system, the devices connected to each other periodically send pilots to each other, and the receiver monitors the communication sewing status on the other side. Shut up.

If one of the devices is unmanned, there is a drawback that the manned side cannot obtain monitoring results for communication lines in both directions.

The present invention uses a low-speed pilot as a single pilot to send monitoring results from a device that does not require monitoring results (hereinafter referred to as a child device) to a device that requires monitoring results (hereinafter referred to as a parent device). To provide a method that solves the above-mentioned drawbacks and allows a parent device to obtain monitoring results of communication lines in both directions (by having two types of uplink pilots that indicate whether or not a communication line has been received). The purpose is to

The gist of the present invention is that in nine opposing devices having inter-device communication lines, the parent device receives the upper > pilot from the slave device, transmits the lower pilot to the slave device during flight, and the slave device transmits the lower pilot within a certain period of time. (Whether or not the pilot has been received)
, two types of top-up pilots are generated and sent to the parent device at fixed time intervals. This allows the parent device to monitor communication lines in both directions.

Next, let's talk about the method of the present invention and examples! This will be explained with reference to page i11.

The drawing shows a conceptual diagram of the inter-device communication line monitoring system, where t+ and tz indicate the time axes of the parent device and child device, respectively, and A and II are the time axes for monitoring. Show timer. In the figure, at 1, the child device applies the next timer TI due to the timeout of the periodic transmission timer T1, and sends out the upper) pilot.The parent device, which has received this at 2, sends the lower pilot, and this
received at Timer T started at 1! When the timeout occurs at 4, the child device sends a pilot message on the top indicating that the communication line is normal, since the child device has received the lower number pi fourt at 3 within T1 hours from the time 40, and sends this to the parent. 5 devices
By receiving this signal, it is determined that both the upper and lower communication lines are normal.

Next, if the lower communication line is in danger of failure, the lower pilot will disappear at 6. 7 and tie Y-Tl is time 1
If you do, the child device may be 7 (because it has not received the pilot within T1 time), then the sub-device is 7 o! i) Sends an upper pilot B indicating a failure, and at step 8, the parent device determines a downlink communication line failure. If the llK or communication line becomes a failure, the upper pilot disappears at 9. The parent device monitors the upper slot with a timer T2), and when the timer Tx (Ts < T2) times out at 10, it is determined that there is a slight failure in the upper slot.

Through the above operations, the *device can monitor both the upper and lower communication lines. In addition, in the figure, the X mark indicates Communication 1IIK.
This indicates that a failure occurred and the pilot disappeared.

As explained above, the present invention provides the parent device with the function of monitoring pilot reception from the child device, and the i-Maruboshi device with the function of sending out the top pilot indicating the status of the communication line from the parent device. This has the effect of making it possible for the parent device to monitor both the upper and lower communication lines without having a separate communication line for monitoring.

[Brief explanation of drawings]

The drawing is a conceptual diagram showing transmission and reception of pilots between parent and child devices on a relationship axis according to the method of the present invention. t+, tz... Time axis between parent and child devices, A, B...
・Pilot, Tl * T2... Monitoring timer. Agent Patent Attorney Toshiyoshi Somekawa

Claims (1)

[Claims] When one of the nine opposing devices with a communication line is set as a parent device and the other as a slave device, the parent device has a function to monitor the reception of communication line No. 188 (hereinafter referred to as upper pilot) from the slave device. The slave device is also provided with a function of periodically transmitting an uplink pilot indicating whether a communication line monitoring signal (hereinafter referred to as a downlink pilot) t-received from the parent device is round or not. An inter-device communication line monitoring method.