JPH0286357A - Test system - Google Patents

Abstract

PURPOSE:To eliminate the need for a test link between modules and to apply the system for a test system of a remote device by providing a test use telephone number, distinguishing a general subscriber telephone number and a test telephone number, sending a call processing message on a B-channel onto a D-channel and sending a call processing message on the D-channel onto the B-channel. CONSTITUTION:A special telephone number (telephone number assigned especially for test) assigned to a subscriber line concentrator 19 from a test board 18 connecting to a time division network 16 is dialed twice and a connection 2B is set to the special telephone number. A multiplex/demultiplex circuit 10 distinguishes the subscriber telephone number or the test telephone number and a signal is sent to a call processing circuit 9 in the case of the test telephone number. Then a sequence is implemented between a central processing unit 17 and the call processing circuit 9 and the connection of B1, B2 and the communication are implemented.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to a test method, and in particular, a test system that provides a telephone number for testing, has a call processing circuit for the telephone number, and
This article relates to a test method that uses NlliI to set up the line under test and perform call/receive tests.

Conventional technology As shown in the fourth factor, this kind of technology in the past includes the test bench 25 (test console Te5tConso).
A test link 27 is required between the line under test 26 and the line under test 26.
6 was withdrawn and a call test was performed.

Problems to be Solved by the Invention The conventional test method described above requires test links between modules, and the length of the test links is 2 to 5 km.
1. This method has disadvantages in that it has poor adaptability to remote devices, and it is difficult to test multiple lines at the same time in order to effectively utilize the test link.

The present invention has been made in view of the above-mentioned conventional situation,
Accordingly, an object of the present invention is to provide a new test method that makes it possible to overcome the above-mentioned drawbacks inherent in the conventional techniques.

Means for Solving the Problems In order to achieve the above object, the test method according to the present invention includes means for providing a special telephone number for the test and distinguishing between the general subscriber telephone number and the test telephone number; a call processing circuit for a telephone number; means for transmitting call processing messages on the B-channel onto the D-channel; and means for transmitting call processing messages on the D-channel onto the B-channel;
- means for performing test relay control from control messages on the channel.

Embodiment Next, a preferred embodiment of the present invention will be specifically explained with reference to the drawings.

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

Referring to FIG. 1, a time division network (Time Divj-
sion Network) 16 (Test console Te5t Con5ole) 18
, a normal circuit-switched call (Circuit 5w1tc
hed Ca1l) according to the connection procedure (CCITT
Enblock (enbl) is used in Q931 protocol.
ock), call the special telephone number assigned to the subscriber line concentrator 19 (telephone number specially assigned for testing) twice, and call the special telephone number 2 B ( 64kbpsX 2 : Each Bl.

connection (referred to as B2)
). Here, the setting method will be explained based on FIG.

The central processing unit 17 that detected the call from the test bench 18
The incoming call sequence for the special telephone number of the subscriber line concentrator 19 is activated via time division #116.

The LAPD protocol is adopted as a common line signaling system between the time division network 16 and the subscriber line concentrator 19, and the D-channel is physically LAPD (Link Acc
essProtocol for D-channel
) Sent to 12. The demultiplexing circuit 10 distinguishes whether it is a subscriber telephone number or a test telephone number, and if it is a test telephone number, a call processing circuit (Cal I Processo)
r) 9 is signaled. In addition, in the case of a subscriber's telephone number, it is sent via LAPD 5 to a line termination device (L
Ine Termination) 4 sends a signal onto the subscriber line, and then the network termination device
Termination ) 2 is sent to the 15DN terminal 1, and a normal incoming call sequence is performed.

Now, in the case of a test telephone number, the sequence shown in FIG.
tion) and communication becomes possible.

In FIG. 2, X indicates a test telephone number, which receives information for path control of the time division switch 11 along with a connect response message (CONNECT ACK) sent from the central processing unit 17, and performs demultiplexing. The circuit 10 performs path control of the time division switch 11.

Note that the telephone number and path control information are deleted by the demultiplexing circuit 10.

Next, a method for testing incoming and outgoing calls according to the present invention will be described.

Control orders are sent and received between the adrenal circuit 8 and the test stand 18 through the B2-channel. First, an order for test relay control is received by the control circuit 8. For example, if the test link relay of the line under test is 14, the test link relay 1
4 and 15 are turned ON, line terminal device 4 - test link relay 14 - test link 3 - test link relay 1
5 to form a link of line termination device 6.

[When the control circuit 8 receives an order with a calling (SETUP) message with the telephone number addressed to the test stand 18 on the outgoing test module B2 channel, the control circuit 8 sends the outgoing call message to the LAPD 7 and sets up the test link. 3, and is received by the line termination device 4 via LAPD 5 - demultiplexer circuit 10 - LAPD 1
2 to the inserter/dropper circuit 13, and after passing through the time division degeneracy 6, it is sent to the central processing unit 17.

When the central processing unit 17 detects the call, the call response is <5E.
TUP ACK) message is sent back, and it is sent back to the time division network 16 ~ inserter/dropper circuit 13 ~ LAPD 12 ~
Multiplex division circuit 10 ~ LAPD 5 ~ line termination device 4 ~ line termination device 4 ~ test link 3 ~ test link relay 15
The D-channel is converted into an 82-channel by the control circuit 8 via the time division network 16 and the LAPD 7, and transmitted to the test stand 18 on the B-channel. This is done according to the transmission test shown in FIG. However, before the test stand 18 outputs a tone, a B1-channel connection order is sent between the control circuit 8 and the line termination device 6. This confirms that a tone is sent from the test stand 18 onto the B1-channel and returns to the test stand 18 via the test link 3 and the 81-channel of the line under test.

[The incoming call test procedure can be considered similar to the above outgoing call test, so the explanation thereof will be omitted.

DETAILED DESCRIPTION OF THE INVENTION According to the present invention, a telephone number is provided for testing, a means for distinguishing between a general subscriber telephone number and a test telephone number, and a call processing circuit for the telephone number; means for transmitting call processing messages on the B-channel onto the D-channel; and means for transmitting call processing messages on the D-channel onto the B-channel;
By having means for transmitting on the channel and means for performing test relay control from control messages on the B-channel, there is no need for test links between modules, and the effect of adapting to remote equipment testing methods is achieved. .

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing one embodiment of the present invention. 1...l5DN terminal, 2...Network termination device (Netw
arkTermination), 3.-Test link, 4.6... Line termination device (Line Term)
ination), 5, 7, 12・=LAPD(
Link Access Protocol for
D-channel), 8...control circuit, 9...call processing circuit (Call Processor), lO...
・Demultiplexing circuit, 11...Time division switch (Time
Division 5w1tch), 13...Inserter/dropper circuit, 14.15...Test link relay, 16...Time division network (Time Dtvisi)
on Network), 17・”Central Processing Unit, 1
8-...Test stand (Test console Te5t Con5
ol), 19... Subscriber line concentrator FIGS. 2 and 3 are sequence diagrams of the present invention. FIG. 4 is a block diagram showing an example of the prior art.

Claims (1)

[Claims] A means for providing a telephone number for testing, a means for distinguishing between a general subscriber telephone number and a test telephone number, a call processing circuit for the test telephone number, and a call processing circuit for transmitting call processing messages on the B-channel to the D-channel. means for transmitting a call processing message on the D-channel onto the B-channel;
and means for performing test relay control from control messages on the B-channel.