JPS6253058A - Constitution method for digital pseudo terminal device - Google Patents

Abstract

PURPOSE:To relieve the load of processing by providing a microprocessor processing a level signal, a code signal, a status signal and an in-channel signal and each control section integratedly to a master station only so as to unify the control interface. CONSTITUTION:A pseudo terminal adaptor 16 transiting the state of a terminal device 1 in the call processing in a pseudo way based on the control of the microprocessor is installed in the master station. Then a pseudo terminal device adaptor 16 interfacing with a subscriber's termination device 2 is provided respectively to the master station and a remote line concentrator, the pseudo terminal main body 17 and a pseudo terminal adaptor 2 are connected by a digital talking line and a digital line to constitute a pseudo terminal device used for the test of the digital exchange and the digital subscriber. Thus, the part simulating the state transition of the terminal device in the call processing based on the microprocessor control is centralized and the common use by the master station and the remote station is attained.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention uses a pseudo It concerns how to configure the terminal.

(Prior art) Regarding maintenance tests for conventional digital exchanges,
For example, Shimakage, Sakai et al. [Maintenance test method for digital subscriber system] (Nippon Telegraph and Telephone Public Corporation Telecommunications Research New Edition,
Research practical application report, VOL.

32, No. 11, 1983. P2461-2
473) D is described. Hereinafter, a conventional maintenance test will be explained according to this.

At digital exchanges (exchanges where the network is digitalized!fi) that accommodates digital subscribers (subscribers who transmit digital signals on subscriber lines), the normality of the exchange is confirmed,
Test items for fault isolation between subscriber lines or terminals and exchanges include outgoing connection tests (making calls to the network and checking the network's operation in response), and in-office calling tests (making calls to the network and checking the network's operation in response). , Incoming calls from a terminal with a fixed method, confirming network operation and path continuity.), In-office incoming call test (initiating a call from a terminal with a fixed method, receiving the call via the network, and responding to it) ), digital outgoing line testing (by placing a call to the outgoing line under test to the network,
Check the operation of the network and the continuity of the path. ), digital incoming line test (a call from the incoming line under test is received via the network, a response is made, and the operation of the network and continuity of the path are confirmed in response), There are trunk tests (confirming network operation and path continuity by making and receiving calls via the trunk under test), and in these tests, terminal operations (state transitions during call processing) are checked. A function to simulate is required, and this F
! In order to realize this function, a pseudo terminal VL device is mounted on the monitoring test rack and the remote monitoring test rack of the remote station.

As shown in FIG. 2, the exchange and the terminals are a terminal 1 consisting of a main channel terminal M (here, a telephone) or a subchannel terminal S (here, a non-telephone), and a residential terminal (DSU) 2-.
Subscriber line 3 - Office side terminating unit (OCU) 4 - Line concentrator (L
C) Network (NW, ) via 5, i.e. exchange R6
It is connected to the. Subscriber line 3 is interfaced with digital number 15, but the digital path is DSU2.
This is the section between the terminal side of 0CU4 and the exchange side of CU4, and the specifications are the main point for the terminal interface. Therefore, when performing a test from 0CU4 to the in-office equipment side, use a test terminal terminal unit (TDSU) 2'' with the same configuration as the DSU 2 for general subscribers, and add a pseudo terminal (device) (DTIS) to it. 1- is connected by the one-point interface described above.

Since one point is the interface between the DSU 2 and the terminal 1, there is a limit of 1111 transmission distances. Therefore, when a remote station is repaired, it is necessary to install the pseudo terminal 1' on the monitoring test rack of the master station and the remote monitoring test rack of each remote station.

In FIG. 2, the latter part of the network 6 is connected via the network 6 to a signal 5A intermediary (SIG) 7 or a relay line 8 to a receiving station, but the signaling device 7 is connected to the former part of the network 6, Alternatively, it may be installed before the line concentration switch of the line concentrator 5, and the following explanation can be applied regardless of the position of the signal device 7.

FIG. 3 shows a test configuration using a conventional pseudo terminal, in which an in-office line concentrator 5 (one piece is shown as a representative).

), a configuration in which the remote station 10 (the case where two stations are accommodated is shown as an example) is accommodated in the master station exchange I16 will be explained.

The terminal capacity (main channel, sub-chitnel) of digital subscribers (each concentrator S!2i, one line being accommodated in the remote station is shown) is accommodated in the DSU2,
The interface during this time is the one-point interface. The DSU 2 is accommodated in the master station or remote station 0CtJ4 through the subscriber line 3. There are various forms of interface between DSU2 and OCUJ, such as two-wire time-division bidirectional transmission (bin-bong transmission), optical wavelength multiplexing transmission, etc.
If the DSU2.0CU4 is designed according to the transmission method, as mentioned above, it is sufficient to use the DSU2 as is by removing the TDSU2-, and to provide a pseudo terminal 1' suitable for the one-point interface, so the following explanation also applies. This is because it can be applied to any subscriber transmission system.

The 0CU 4 is accommodated in the network 6 via a line concentrator d5 (in the case of a remote station, via a remote line concentrator 5-, a transmission terminal device (not shown), and a relay line).

Further, the 0CU4 can be disconnected from the subscriber line 3 and connected to the test line ITL by a built-in lead-in switch. This is possible for any subscriber.

The drawn-in test line ITL is connected to the TDSU2- via the test space division concentrator switch 11 or 11-, and the TDSU2- is connected to the pseudo terminal 1- by a one-point interface. In addition, there is a test line DTL that is connected to TDSU2- without going through a space division concentrator switch for testing, which has the same form as one terminal of a subscriber from 6 fixed 0CU4-, and this is also a one-point interface. is connected to a pseudo-terminal code.

FIG. 4 is a block configuration diagram showing an example of a pseudo terminal,
TDStJ2' interface section TINF.

Level signal control unit LVL, code signal control unit COD,
In-channel signal control unit 1NC11, status control unit STS, microprocessor interface unit CPU
It is composed of INF and microprocessor CPU. All parts except the microprocessor CPU are TDSU
The same number of machines as 2- is installed.

Note that the frame structure, test sequence, etc. shown below, including the example of the block structure in FIG. 4, describe an example of a one-point interface (hereinafter referred to as the Y interface), but are limited to a specific interface. It can be applied to any interface.

The fifth factor shows the Y interface at one point, and is composed of an in-channel signal 81, an out-channel signal D1, and a multi-frame pattern F. The D bit has a multi-frame configuration and includes a level signal and a code signal, and the level signal is in a continuous state (
(call origination, response, recovery, recovery confirmation, etc.), code signals are used to send and receive non-persistent control signals (progress display, dialing signals, etc.) to and from the signaling device of the exchange.

In the Y interface, the level signal is Dl.

2 bits of Dll, the code signal is D3. D5. D7゜D
, D13. D15. D17. It is 8 bits of D19.

Note that one point is a CMI code (the value of "O" represents the first and second half of the time corresponding to 1 bit length as low level and high level, and the value of rlJ represents the time corresponding to 1 bit length as only high level or high level). The multi-frame information is interfaced with the CMI code's violation (the alternation of the "1" values is broken, and the violation is inserted at the point where the violation is inserted). , the value of ``1'' in the 13th digit can be inserted at the same level as the previous value of ``1''. In addition to the above, there are status signals such as the signal SV indicating synchronization establishment and the signal O8 indicating the stoppage of operation of the exchange. This bit is included in the F bit.

The above-mentioned signals, excluding multi-frame information, can be set/read by the I10 command etc. from the microprocessor CPU, and furthermore, the signal S that requests power supply to the TDSU 2', and the signal J that displays the power supply destination. P is also set/! a
It is possible to take it.

Note that the power supply request from the terminal to DStJ2 and the DS
Power is supplied from tJ2 to the terminal using the configuration shown in Figure 6, but TDSU2- is often used with 08U2 installed as is, and in that case, the power supply request, power supply (
The power supply display) will also be configured as shown in the same diagram as the terminal circuit.

With the above configuration, the exchange can be tested - for example, an incoming call test (calls are made from the test line DTL to the designated test line ITL) to check the normality of the incoming sequence control and the relationship between the test line DTL and the test line ITL. The operation when performing a test to confirm the normality of the conduction of the in-channel path between the two will be explained with reference to FIGS. 3 and 7.

When the test stand 14 sends a test command that specifies the test item (internal call test), the telephone number of the incoming subscriber station, and the type of communication (main/sub channels, signal speed, etc.), the test control device 13 or 13' drives the lead-in switch, connects the test space division concentrator switch 11 or 11', and connects the corresponding terminal in the station where test preparation subscribers are accommodated or in the pseudo terminal 1- of each remote station. The command is transferred to the target.

Commands to the pseudo terminal 1' in the station are sent to the test stand controller 15.
The commands to the pseudo terminal 1'' of the remote station 10 are transferred from the test stand control station B to the test control unit 13, which controls the maintenance test equipment mounted on the monitoring test rack. Via a control link provided for the control of the computer, the test fee m+ device 13'' of the remote station is connected via an add-drop circuit 12 and transferred via there.

When the pseudo terminal 1' receives a command, it is analyzed by the built-in program and controls the transmission sequence for the test line DTI-, that is, the operation of the calling side pseudo terminal as shown in FIG. 7, and the control for the test line IT+. On the other hand, the incoming call sequence ^11
1@, that is, the operation of the called-side pseudo terminal shown in the figure is performed. In the case of an in-office call test, the receiving side is the test target, and the calling (Δ) side is used as a test tool.

In addition, the meaning of the symbol shown in 0 in Fig. 7 is L.
. . . level signal, C . . . code signal, S . . . status signal, I . . . inch P channel signal. The built-in microprocessor +1 CPU transmits/reads these signals according to the program and compares them with the correct pattern.At the same time, it also monitors the time, and if the state does not change to a predetermined state within a predetermined time, the network If the control from the command line is not being performed normally, the command will be disconnected and the result will be returned as an answer to the command.

(Problems to be Solved by the Invention) As mentioned above, pseudo-terminals are used to control the state of terminals in call processing.
In order to simulate one transfer, a built-in microprocessor is large and expensive, so installing it in each of the master station and each remote station will affect the economic efficiency of the entire system. There was a problem in that it made the image look worse.

In addition, in the case of remote stations, especially those housed in portable boxes, installing large pseudo-terminals poses problems in terms of implementation, and in terms of control, test commands are sent separately from the test control I device to each pseudo-terminal. The problem is that it is complicated and requires a large processing load.

The purpose of the present invention is to solve the above-mentioned problems, have excellent economic efficiency, and
The object of the present invention is to provide a method for configuring a pseudo terminal that is easy to implement and can reduce the burden on a test control device.

(Means for Solving the Problems) In order to solve the above problems, the present invention provides a method for configuring a pseudo terminal used for testing digital exchanges and digital subscriber lines. A pseudo-terminal body that simulates the state transition of the terminal is installed in the master station, and a pseudo-terminal adapter that interfaces with the in-home terminal 8tlf is installed between the master station and the remote terminal.
8a, and the pseudo terminal main body and the pseudo terminal adapter were connected through a digital communication path and a digital line to transmit and receive signals under test and control information.

(Function) According to the present invention, the part that simulates the state transition of a terminal in call processing is centralized under microprocessor control, and can be shared by a master station and a remote station.

(Actual Example) FIG. 1 is a block diagram showing an example of a test configuration using a pseudo terminal (device) of the present invention, and the configuration of the exchanger is used for explaining the conventional configuration in FIG. It's the same as it was. 0C
The part from U4 to the connection to TDSU2- is the same as that used in the description of the conventional configuration.

rD is connected near TDSU2- by a single point interface.
Pseudo-terminal adapter 16 interfacing with sU2'
(second block) is FiQf5f, and the pseudo terminal (equipment) main body 17 (first block) is installed centrally on the master station monitoring test rack (the pseudo terminal equipped with the number of circuits required from the traffic conditions is installed). (You only need to install one unit.)

FIG. 8 is a block diagram showing one embodiment of the pseudo terminal of the present invention, in which the interface section 1'I with the TDSU2-
Separate NF as pseudo terminal adapter 16 and connect TDSU2
- installed near the level signal control unit LVL, code signal control unit COD, and inch channel signal control unit INcI.
+, a status control section STS, a microprocessor interface section CPUINF, and a microprocessor CPU are installed in the pseudo terminal 17.

The same number of pseudo terminal adapters 16 as TDSUs 2' are provided, but each part of the pseudo terminal main body 17 (excluding the microprocessor) only needs to have as many circuits as required by the test traffic, and a large number of remote line concentrators are accommodated. If there are, the number of units flowing will be considerably smaller than the number of TDSUs 2'.

Further, regardless of the number of remote line concentrators, only one microprocessor CPU is required. The pseudo terminal adapter 16 has an interface section DTISINF with the pseudo terminal main body 17, and the pseudo terminal main body 17 has an interface section APINF with the pseudo terminal adapter 16.

Point B in Figure 8 is connected only through a test time division concentrator switch in the case of a station, but in the case of a remote east line device, it is connected to the master station pseudo terminal, so A The point is placed on one or several time slots of the digital line between the remote concentrator and the master station by the add/drop circuit 12', and after passing through the transmission end station equipment and through the master exchange network, the time-division concentrator for testing is It comes to be connected to the pseudo terminal main body 17 after the switch 18.

Incidentally, even in the case of the conventional configuration, the test time division switch is already provided for switching various other digital signals of the monitoring test rack, and is not newly required for the embodiment of the present invention.

Further, the add/drop circuit 12' can be realized by only slight modification of the circuit provided as a control link for controlling a remote station in the conventional configuration, and thus does not impair economic efficiency.

Fig. 9 does not show an example of the transmission format between point B and in-channel signal B, out-channel signal,
In addition to the multi-frame pattern FP, the power supply request signal S, and the power supply detection result P, there is also a pseudo terminal device adapter return designation RT for confirming and testing the normality of transmission between points and one point B, and an out-of-synchronization display signal HE. , parity PY, parity error display PE, parity pseudo-normal specification DG, main a1
Channel switching designation CH etc. are accommodated. Note that the one-point interface is a CMI code, and the frame pattern can be inserted as a violation, but since one or several time slots of a digital line are used between points and points B, insertion as a violation is not possible. Therefore, the multi-frame pattern FP is separately provided as an independent fixed pattern, and F bits are separately provided for the signals F2 to F2o.

The operation when testing a switch according to this embodiment will be explained in the first part, taking as an example the incoming call test explained in the conventional configuration.
This will be explained with reference to the drawings and FIG.

The test system riJ device 13 is activated by a command from the test stand 14.
Or 13- drives the lead-in switch and connects the test space division concentration switch 11 or 11' as in the case of the conventional configuration, and at the same time connects the test time division switch 18, and also connects the pseudo terminal main body 17 (main In the invention, commands are transferred to the main station (which is centrally installed in the master station).

Since the command transfer destination is a centrally installed pseudo terminal, there is no need to divide the routes as in the case of the conventional configuration.

The operation of the pseudo terminal body 17 that receives the command is the same as in the conventional configuration. That is, the built-in program analyzes the command and controls the outgoing sequence for the test line DTL, that is, the operation of the outgoing pseudo terminal in the same way as shown in FIG. 7, and the incoming sequence for the test 1i11TL. The control, that is, the operation of the receiving side pseudo terminal is performed in the same manner as shown in the figure. Here, all the circuits controlled by the microprocessor as I10 commands are concentrated in the pseudo terminal body 17, so the level signals, code signals, status signals, in-channel signals, etc. are the same as in the conventional configuration. In addition to transmitting/reading according to the program and comparing with the correct pattern, time monitoring is also performed to determine normality/abnormality. In addition, since the standard value (timeout value) for time monitoring (timeout value) is on the order of several seconds to several tens of seconds, the pseudo terminal main body 17 and the pseudo terminal adapter 16 are separated, and the digital communication path and digital Time delays due to line insertion are not a problem.

(Effects of the Invention) As described above in detail, according to the present invention, an expensive microprocessor, microprocessor interface section, level signal, code signal, status signal, in-channel signal, and each control section are centralized and integrated into a master station. Since it is placed only in the test control system, it is expected to improve economic efficiency, and the remote station, especially when it is housed in a portable box, can be made smaller. By centralizing the control interface, the test control equipment can be easily This has the effect of reducing the processing load.

[Brief explanation of the drawing]

The drawings serve to explain the present invention, and FIG. 1 shows an example of a test configuration using a pseudo terminal of the present invention, and FIG. 2 shows a section showing a connection between an exchange and a terminal. 3 shows a test configuration using a conventional pseudo terminal; FIG. 4 is a block diagram showing an example of a conventional pseudo terminal; FIG. Diagram showing the interface,
FIG. 6 is a diagram showing the relationship between power supply requests and power supply between the terminal and the home terminal equipment, FIG. 7 is a diagram showing the originating and receiving terminal sequence in the test, and FIG. 8 is an implementation of the pseudo terminal of the present invention. FIG. 9, a block diagram showing an example, is an explanatory diagram of the format between the pseudo terminal adapter and the pseudo terminal main body. 1...Terminal (M...Main channel, S...Subchannel), 2...Home route ga device (DSU>, 3...Subscription groove line, 4...Station side terminal device ( OCU), 5... Line concentrator (LC), 6... Network (exchange), 7
...Signal equipment ff1 (SIG), 8...Relay line, 2
-...Test home termination \A location (TDSU), 16...
・Pseudo terminal adapter, 17...Pseudo terminal body, 18・
...Time-division concentrator switch for testing, 12-...branch/insertion circuit. TINF ---- One room 11 with DLIS> ヲ 2 Ace Q1 ゛ Slow trunk T5 (Beyond Song) 097 Lei Ward Fig. 4

Claims (1)

[Claims] In a method for configuring a pseudo terminal used for testing digital exchanges and digital subscriber lines, a pseudo terminal body that simulates the state transition of a terminal during call processing based on the control of a microprocessor is used as a master station. A pseudo-terminal adapter that interfaces with the in-home terminal device is installed in each of the master station and remote concentrator, and the pseudo-terminal itself and the pseudo-terminal adapter are connected by a digital communication path and a digital circuit. A method for configuring a digital pseudo terminal, characterized in that the digital pseudo terminal is configured to transmit and receive a signal under test and control information.