JP2765034B2 - Overload test method for signaling equipment - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an overload test method for a signal device, and particularly to an ISDN
The present invention relates to an overload test method for a signaling device that processes a data link layer of a user network interface.

[Conventional technology]

A conventional overload test method for a signal device is performed with a configuration as shown in FIG. That is, the line corresponding units 62, 63, 64, 65,
The signaling device 6 comprising the common control unit 66 and the common control unit 61 includes the host device 2 and the line corresponding units 42, 43, 44, 4 included in the pseudo terminal device 4.
Connected to 5,46. In addition, the test system control unit 5 is connected to the host device 2 and the common control unit 41 included in the pseudo terminal group device 4. Further, prior to the test, the common control unit 61 of the signaling device 6 performs an initial setting so that the line corresponding units 62, 63, 64, 65, and 66 operate collectively in the network mode.

 Next, the operation will be described.

FIG. 5 is a signal sequence diagram of a conventional overload test method for a signal device.

First, when the device 2 activates a command for instructing frame transmission of the line corresponding unit 62 of the signal device 6, the common control unit 61 reads this command and instructs the line corresponding unit 62 to perform frame transmission. At this time, since the line corresponding unit 62 is initially set to operate in the network mode, if the frame to be transmitted is a command frame, the bit of the command response field (hereinafter referred to as C / R) in the frame is set to “ If the frame to be transmitted is a response frame, set the C / R bit in the frame to “0”.
And send it out on the line. The frame transmitted in this manner is received by the line corresponding unit 42 of the pseudo terminal group device 4. At this time, since the line corresponding unit 42 is initially set to operate in the user-side mode, if the C / R bit of the received frame is “1”, it is processed as a command frame, and if the C / R bit is “0”, it is processed as a response frame. Is performed. Conversely, when the line corresponding unit 42 of the pseudo terminal group device 4 transmits a frame, if the frame to be transmitted is a command frame, the C / R bit in the frame is set to “0”, and the transmission is performed. If the frame is a response frame, the C / R bit in the frame is set to "1" and transmitted on the line.

The frame transmitted in this manner is received by the line corresponding unit 62 of the signaling device 6. At this time, the line correspondence unit 62
Is initially set to operate in the network mode, so that if the C / R bit of the received frame is "0", processing is performed as a command frame, and if "1", processing is performed as a response frame. If a status report of the result of processing in a normal command frame or response frame is required, the status is reported to the higher-level device 2 via the common control unit 61 as a status.

Conventionally, the operation described above is performed by the line corresponding units 62, 63, 64, 6
The overload test of the signal device 6 was performed by repeating between 5,66 and the line corresponding units 42,43,44,45,46.

[Problems to be solved by the invention]

The above-described conventional overload test method for a signaling device has a configuration in which the operation modes of all the line corresponding units of the signaling device to be tested must be determined and set to either the network side or the terminal side (this description). In the pseudo terminal group device, the same number of line-corresponding units as the line-corresponding units of the signal device to be tested must be prepared in the pseudo terminal group device, which increases the amount of hardware used for the test. There is a point.

An object of the present invention is to replace two pseudo line group devices with two different line-corresponding units in a signaling device facing each other, and to change the usage of C / R bits in a layer 2 frame from a network side to a user side value. By providing a loopback circuit that changes and also changes the frame check sequence, it provides a signal device overload test method that makes it easy to set up the line corresponding part of the signal device and reduces the amount of hardware used for testing. Is to do.

[Means for solving the problem]

An overload test method for a signal device according to the present invention comprises a plurality of line-corresponding units which are provided for subscribers and operate in accordance with designation of whether to operate in a network side or a user side at the time of initial setting and the line during test operation. A signaling device for processing a data link layer of an ISDN user network interface comprising a common device for initially setting a corresponding part to operate in a network mode and controlling the same; and a data link layer for an ISDN user network interface. The upper device also has a function of performing the processing of the upper layer and controlling the signal device by command start and status report and continuously performing the command start and status report processing at the time of the test operation, and the upper device at the time of test operation. A test system control unit for performing control and two different line corresponding units in the signal device are opposed to each other, and the How to use the C / R bit change from the network side to the value of the user-side is a configuration in which the folding circuit to change both the frame check sequence associated therewith in the frame.

〔Example〕

Next, embodiments of the present invention will be described with reference to the drawings.

 FIG. 1 is a block diagram of one embodiment of the present invention.

The signal device 1 composed of the line corresponding units 12, 13, 14, 15, 16 and the common control unit 11 is composed of a higher-level device 2 and the line corresponding units 12, 13, 14,.
... A wrap-around circuit that changes the usage of C / R bits in the layer 2 frame from the network side to the user side value, and also changes the frame check sequence accordingly, with 15, 16 pairs facing each other. 3 is connected. Line corresponding part 12,1
The combinations of 3,14, ... 15,16 are 12 and 16,13,15,14 and ... The test system control unit 5 is connected to the host device 2 and the loopback circuit 3. The test system control unit 5 instructs the signal device 1 to perform a test operation mode via the host device 2. Upon receiving the instruction, the common control unit 11 of the signal device 1
2, 13, 14, ..., 15 and 16 are initialized so as to operate in the network mode.

 FIG. 2 is a block diagram of the folding circuit 3.

The loopback circuit 3 includes a flag detection circuit 31 that detects a flag when a frame is received from the line corresponding unit, a C / R bit position timing generation circuit 33 that generates a pulse when a C / R bit in the frame is received, / R Receives the output of the bit position timing generation circuit 33 and receives the output of the exclusive OR circuit 32, which inverts the logical value of the C / R bit of the frame received by the flag detection circuit 31, and the output of the exclusive OR circuit 32 Shift register 35, an FCS position timing generating circuit 34 which receives the output of the flag detecting circuit 31 and generates a 16-bit wide frame check sequence (hereinafter referred to as FCS) position timing signal, and an exclusive logic through the shift register 35. Sum circuit 32
Generates FCS by receiving C / R bit of frame inverted by
It comprises an FCS generation circuit 36 and a selector 37 that receives the output of the FCS position timing generation circuit 34 so as to insert the output data of the FCS generation circuit 36 at the position of the FCS in the frame.

 Next, the operation will be described.

FIG. 3 is a signal sequence diagram of one embodiment of the present invention. The reference numerals in the figure are the same as those in FIG.

Here, when the higher-level device 2 activates a command to instruct frame transmission of the line corresponding unit 12 of the signal device 1, the common control unit
11 reads this command and instructs the line corresponding unit 12 to transmit a frame. At this time, since the line corresponding unit 12 operates in the network mode, if the frame to be transmitted is a command frame, the C / R bit in the frame is set to “1”,
If the frame to be transmitted is a response frame,
The C / R bit is set to "0" and transmitted on the line.

The frame transmitted in this manner is supplied to the folding circuit 3
The signal is received by the line corresponding unit 16 of the signal device 1. At this time, since the usage of the C / R bit in the frame has been changed from the network side to the user side, the line corresponding unit 16 normally receives the frame. Therefore, the command frame transmitted from the line corresponding unit 12 is correctly processed as a command frame by the line corresponding unit 16, and the same applies to the response frame. If a status report is required as a result of the processing, the status is reported as a status to the host device 2 via the common control unit 11.

The sequence as described above, the line corresponding unit 12, 13, 14,
.., 15 and 16, the overload test of the signal device 1 can be performed.

In the above-described operation, the turning-back circuit 3 sets the C / R in the frame.
If the value of the bit is not changed,
3, 14,..., 15 and 16 are processed as a command frame if the C / R bit of the received frame is “0”, and as a response frame if the C / R bit is “1”.
The command frames transmitted from 2, 13, and 14 are regarded as response frames by the line corresponding units 16, 15,..., And correct processing is not performed. The same applies to the response frame, in which case no correct processing is performed.

〔The invention's effect〕

As described above, according to the present invention, two different line-corresponding units in a signaling device are opposed to each other in place of a pseudo terminal group device, and a method of using C / R bits in a layer 2 frame is determined by a user from the network side. By providing a loopback circuit that changes the value on the side and also changes the frame check sequence accordingly, the setting of the line corresponding part of the signal device is simplified, and the amount of hardware used for the test is reduced.

[Brief description of the drawings]

FIG. 1 is a block diagram of one embodiment of the present invention, FIG. 2 is a block diagram of a folding circuit 3, FIG. 3 is a signal sequence diagram of one embodiment of the present invention, and FIG. FIG. 5 is a block diagram of a load test system, and FIG. 5 is a signal sequence diagram of an overload test system of a conventional signal device. 1,6 ... signal device, 2 ... host device, 3 ... return circuit, 4 ... pseudo terminal group device, 5 ... test system control unit, 11 ...
... Common control unit, 12,13,14, ... 15,16 ... Line corresponding unit included in signal device 1, 31 ... Flag detection circuit, 32 ... Exclusive OR circuit, 33 ... Command response field ( C /
R) Bit position timing generator, 34 ... Frame check sequence (FCS) position timing generator, 35
... shift register, 36 ... FCS generation circuit, 37 ... selector, 42, 43, 44, 45, 46 ... line corresponding unit included in pseudo terminal device 4, 62, 63, 64, 65, 66 ... A line corresponding unit included in the signal device 6.

Claims (1)

(57) [Claims] 1. A plurality of line-corresponding units which are provided for subscribers and operate according to designation of a mode on a network side or a user side at the time of initial setting, and the line corresponding unit is operated in a network-side mode during a test operation. A signaling device for processing a data link layer of an ISDN user network interface including a common device that is initially set to operate and controls the signal processing, and performs processing of a layer higher than the data link layer of the ISDN user network interface. A higher-level device having a function of controlling the signal device by command activation and status reporting and continuously performing command activation and status reporting processing during a test operation; and a test system control unit for controlling the higher-level device during a test operation. And a commandless signal in a layer 2 frame by making two different line corresponding portions in the signal device face each other. Overload test method signaling devices, characterized in that to change the use of Nsu field bits from the network side the value of the user side provided with a folding circuit to change both the frame check sequence associated therewith.