JPH03169148A - Test control circuit for subscriber line carrier equipment - Google Patents

Abstract

PURPOSE:To attain the channel test and the loop test by identifying a terminal equipment belonging to a tested channel, detecting the changeover of a relay in the tested channel and controlling a PROCEED signal with an identification signal and a detection signal. CONSTITUTION:A tested channel identification circuit 11 identifies whether a tested channel exists in a remote terminal equipment 5 or a extended remote terminal equipment 6 and a battery voltage representing it that a relay in the tested channel is changed over is detected by a battery voltage detection circuit 20. A PROCEED signal control circuit 12 based on a tested channel identification signal returns a PROCEED signal to a central terminal equipment 3 when the tested channel exists in a channel in the remote terminal equipment 5. On the other hand, when the tested channel is within an extended remote terminal equipment 6, the PROCEED signal control circuit 12 returns the PROCEED signal to the central station terminal equipment 3. Thus, the channel test and the subscriber line system loop test are implemented by the PGTC (Pair Gain Test Controller).

Description

Detailed Description of the Invention [Field of Industrial Application] The present invention relates to a test circuit for subscriber line carrier equipment, and particularly to a test circuit for subscriber line carrier equipment for channel testing and subscriber line system loop testing. Concerning test circuits for equipment.

[Conventional technology]

Conventionally, PGT○ (Pair Gain
During a test conducted by a test controller, a test control circuit of a subscriber line carrier (for example, Japanese Patent Application Laid-open No. 56-98065) detects the battery voltage between Tip and Ring of the channel under test in a remote terminal. Otherwise, the PROCRED signal would not be returned from the remote terminal to the central station terminal. [Problems to be Solved by the Invention] The test control circuit of the conventional subscriber line carrier device described above is capable of controlling the T i p -Rin of the channel under test in a remote terminal.
PROCEED if the battery voltage between g is not detected.
Since signals are not sent back from the remote terminal to the central office terminal, the channel under test is sent as a multiplexed digital signal from a multiplexed digital signal interface in the remote terminal. Furthermore, if the extended remote terminal is located at a remote location, the battery voltage between the tip and ring of the channel under test cannot be detected within the extended remote terminal, so the PROCEED signal is returned from the extended remote terminal to the central station terminal. Therefore, there was a problem in that channel tests and subscriber line system loop tests using PGTC could not be performed.

[Means to solve the problem]

The test control circuit of the subscriber line carrier of the present invention includes identification means for identifying a terminal to which a channel under test belongs and transmitting an identification signal, and detecting switching of a relay in the channel under test and transmitting a detection signal. and control means for controlling a return PROCEED signal to be transmitted to a central terminal connected to the channel test and subscriber line loop test means based on the identification signal and the detection signal. [Example] Next, 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 subscriber line system loop tester 4 is Pair GainT.
est Controller RGT C ) 1, the exchange 2, the central office terminal 3, and the communication path 7 between the central office terminal 3 and the remote terminal 5 to send a test start signal to the channel under test. If the channel under test is a channel within the remote terminal 5, the remote terminal channel 9 sends a signal to the test control circuit 10 indicating that a test start signal has been sent to the remote terminal channel 9. In addition, if the channel under test is a channel within the extended remote terminal 6, the digital signal interface 8 with the extended remote terminal 6 indicates that a test start signal has been sent to the extended channel within the remote terminal 6. Test signal control circuit 1
Send to 0. The channel under test identification circuit l1 in the test control circuit 10 identifies whether the channel under test is within the remote terminal 5 or the extended remote terminal 6, and sends the channel under test identification signal to the PROCEED signal control circuit 11. send. PGTCl then sends the PROCEED signal to the test control circuit 10 through the central office terminal 3. PROCEED
Upon receiving the signal, the test control circuit 10 switches the relay in the channel under test and connects the subscriber line to a bypass line (Bypass line).
s Pair) 1 6 or an extended remote terminal Sends a signal to the remote terminal 5 or extended remote terminal 6 indicating that it is to be connected to the Bypass Pair 1 7. When the battery voltage detection circuit 20 detects the battery voltage between T i p and R i g indicating that the relay in the channel under test has switched, the battery voltage detection circuit 20 detects the PROCEED signal control circuit 12. Sends a battery voltage detection signal to PRO
If the channel under test is a channel within the remote terminal 5 based on the channel under test identification signal, the CRED signal control circuit 12 checks the battery voltage detection signal and then starts PRO.
The CEED signal is sent back to the central terminal 3. On the other hand, in the case of the channel in the remote terminal 6 where the channel under test is extended, the PROC
The EED signal control circuit 12 returns the PROCEED signal to the central office terminal 3.

〔Effect of the invention〕

As explained above, the present invention includes an identification means for identifying a terminal to which a channel under test belongs and transmitting an identification signal, and a detection means for detecting switching of a relay in the channel under test and transmitting a detection signal. , comprising a channel test and subscriber line loop test means and a control means for controlling a return PROCRED signal to be transmitted to a central terminal of the connection based on the identification signal and the detection signal, so that the channel under test is a remote terminal. PGTC, both within the network and within extended remote terminals.
This has the effect of making it possible to perform channel tests and subscriber system loop tests.

[Brief explanation of the drawing]

FIG. 1 is a block diagram of one embodiment of the present invention. 1...PGTC, 2...exchange machine, 3...Central office terminal, 4...Loop testing machine, 5...Remote terminal, 6...extended remote terminal.

Claims (1)

[Scope of Claims] 1. Identification means for identifying a terminal to which a channel under test belongs and transmitting an identification signal; detection means for detecting switching of a relay in the channel under test and transmitting a detection signal; A subscriber line carrier device comprising channel test and subscriber line loop test means and control means for controlling a return PROCEED signal to be transmitted to a central terminal of connection based on the identification signal and the detection signal. test control circuit. 2. The test control circuit for subscriber line carrier equipment according to claim 1, wherein the detection signal is transmitted when a relay in the channel under test switches and detects a battery voltage between Tip and Ring.