JPH04953A - Test control circuit for subscriber line carrying device - Google Patents

Abstract

PURPOSE:To perform the channel test and the subscriber line system loop test by means of PGTC (pair gain test controller) by providing an extended remote terminal with a battery voltage detecting circuit and providing a remote terminal with a proceed signal control circuit and operating them. CONSTITUTION:A battery voltage detecting circuit 6B is provided, and a multiplexed digital signal is transmitted to this circuit 6B from a multiplexed digital signal interface 5C in a remote terminal 5 arranged remotely from a PGTC 1 and the circuit 6B sends a battery voltage detection signal indicating that a relay in a channel to be tested in a remote terminal extended in a remote place is switched, and a proceed signal control circuit 5B is provided which controls the return of a proceed signal, which is transmitted from the PGTC 1 to the remote terminal 5 through a central station terminal 3, based on the battery voltage detection signal transmitted from the extended remote terminal 6. Thus, the channel test and the subscriber line system loop test by means of the PGTC 1 are performed though the channel to be tested exists in the extended remote terminal 6.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a technique for testing subscriber line carrier equipment, and in particular to channel testing and subscriber line testing of North American pair-gain type subscriber line carrier equipment. This invention relates to a test control circuit for subscriber line carrier equipment related to system loop test technology.

[Conventional technology]

Bare Gain Test Controller (Pa
ir Ga1n Te5t Controller,
During the test conducted by the North American Pa1r Ga1n system subscriber line carrier (hereinafter referred to as PGTC), the test control circuit of this type of North American Pa1r Ga1n system subscriber line carrier (for example,
(described in the specification) does not return the PROCEED signal from the remote terminal to the central station terminal unless the battery voltage between the tip and ring (Tip-R4ng) of the channel under test is detected in the remote terminal. It has become a thing.

[Problem to be solved by the invention]

The test control circuit of the conventional North American Pa1r Ga1n subscriber line carrier described above does not transmit the PROCEED signal from the remote terminal to the central station terminal unless the battery voltage between Tip and R4ng of the channel under test is detected in the remote terminal. I am not supposed to reply to. Therefore, if the channel under test is in an extended remote terminal at a further remote location where a multiplexed digital signal is sent from a multiplexed digital signal interface in the remote terminal, the extended The battery voltage between Tip and R1ng of the channel under test in the remote terminal cannot be detected. Therefore, since the PROCRED signal cannot be returned from the remote terminal to the central office terminal, there is a problem in that channel tests and subscriber line system loop tests by PGTC cannot be performed.

It is an object of the present invention to eliminate such problems and to maintain PGT even when the channel under test is in an extended remote terminal.
An object of the present invention is to provide a test control circuit for a subscriber line carrier device capable of performing a channel test and a subscriber line system loop test using C.

[Means for Solving the Problems] The present invention provides a test control circuit for a subscriber line carrier using a North American pair gain method for channel testing and subscriber line system loop tests using a pair gain test controller, which includes the following steps: A multiplexed digital signal is sent from a multiplexed digital signal interface in a remote terminal located remotely from the controller, and a relay in the channel under test in an extended remote terminal at a remote location. a battery voltage detection circuit that sends out a battery voltage detection signal indicating that switching has occurred, and a battery voltage detection circuit that sends out a battery voltage detection signal indicating that switching has occurred; The device is characterized by comprising a procedure signal control circuit that performs control based on a battery voltage detection signal sent from the terminal.

In the present invention as described above, the battery voltage detection circuit in the extended remote terminal detects a tip-to-ring battery voltage indicating that the relay in the channel under test has switched, and Preferably, a battery voltage detection signal is sent to the signal control circuit.

〔Example〕

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

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

In FIG. 1, a PGTC channel test and a subscriber line system loop test are performed using the test control circuit of the North American Pa1rGain type subscriber line carrier according to the present invention.

In FIG. 1, l is the PGTC, 2 is the exchange, 3 is the central office terminal, 4 is the subscriber line loop tester, 5 is the remote terminal,
6 is an extended remote terminal, 11 is a test trunk (Te
12 is a communication path between the PGTC and the central office terminal, 13 is a communication path between the central office terminal and the remote terminal, 14 is a digital signal communication path between the remote terminal and the extended remote terminal, and 15 is a channel within the remote terminal. Subscriber line to which it belongs, 16
is a subscriber line belonging to an extended remote terminal channel,
17 is a DC bypass test pair (DCBypass T
e5t Pa1r), 18 is D to extended remote terminal
It is CBypass Te5t Pa1r.

Further, 5A is a battery voltage detection circuit for a channel in a remote terminal, 5B is a PROCEED signal control circuit, 5C is a digital signal interface to an extended remote terminal, and 5D is a channel in a remote terminal.

Additionally, 6A is an extended remote terminal channel, 6B
is an extended remote terminal channel battery voltage detection circuit.

Next, the operation of this embodiment will be explained.

At the start of the test, the subscriber line system loop tester 4
and exchange 2, an extended remote terminal channel 6 for channel testing and subscriber line loop testing.
Send a test start signal to A. This extended remote terminal channel 6A sends a 5EIZE signal to PGTC1 indicating that it has received the test start signal. This 5
Upon receiving the EIZE signal, the PGTC1 transmits the P in the remote terminal 5.
A PROCEED signal is sent to the ROCEED signal control circuit 5B. PROCEED signal control circuit 5B provides a digital signal interface 5C to an extended remote terminal.
and the remote terminal-extended remote terminal channel 6 via the extended remote terminal digital signal communication path 14.
Sends the NGATE signal to A to switch the relay inside the channel. 20 NGATE signal received,
The extended remote terminal channel 6A switches the internal relay to connect the subscriber line 16 belonging to the extended remote terminal channel to the extended remote terminal via DCBypas.
Connect to sTest Pa1r18. The battery voltage detection circuit 6B of the extended remote terminal channel detects the battery voltage indicating that the relay of the extended remote terminal channel 6A has switched, and sends a battery voltage detection signal to the PROCRHD signal control circuit 5B. and send it. PROCE receives this battery voltage detection signal.
The ED signal control circuit 5B returns the PROCRED signal to the PGTC 1 via the central office terminal 3.

In this way, this embodiment is applicable to North American Pa1r for channel testing and subscriber line system loop testing by PGTC.
In a test control circuit of a Ga1n subscriber line carrier, a multiplexed digital signal is sent from a multiplexed digital signal interface in a remote terminal, and the test target in an extended remote terminal at a remote location is Tip-R indicating that the relay in the channel has switched
Detects the battery voltage between PRO in the remote terminal.
A battery voltage detection circuit sends a battery voltage detection signal to the CEED signal control circuit, and a battery voltage detection circuit sends a battery voltage detection signal from the extended remote terminal to the PROCRED signal sent from the PGTC to the remote terminal via the central office terminal. It has a PROCEED signal control circuit that performs control based on a voltage detection signal.

As a result, this embodiment can detect the battery voltage between the tip and ring of the channel under test in the extended remote terminal, and can return the PROCEED signal from the remote terminal to the central station terminal. Performs line system loop tests.

〔Effect of the invention〕

As explained above, according to the present invention, even if there is a channel under test in an extended remote terminal, channel tests and subscriber line system loop tests can be performed using a pair gain test controller. be.

[Brief explanation of drawings]

FIG. 1 is a block diagram showing one embodiment of the present invention. 1... Pair gain controller (PGTC) 2.
... Switchboard 3 ... Central office terminal 4 ... Subscriber line loop tester 5 ... Remote terminal 6 ... Extended remote terminal agent Patent attorney Yoshiyuki Iwasa

Claims (2)

[Claims] (1) In a test control circuit of a North American pair gain system subscriber line carrier equipment for channel testing and subscriber line system loop tests using a pair gain test controller, a remote terminal located remotely from the pair gain test controller. A battery voltage detection signal indicating that a relay in the channel under test in an extended remote terminal has switched, from which a multiplexed digital signal interface is sent from a multiplexed digital signal interface within the a battery voltage detection circuit that sends out a battery voltage detection circuit that sends out a battery voltage detection signal sent from the extended remote terminal; 1. A test control circuit for a subscriber line carrier, comprising: a procedure signal control circuit that performs control based on. (2) a battery voltage detection circuit in the extended remote terminal detects a tip-to-ring battery voltage indicating that a relay in the channel under test has switched;
2. A test control circuit for a subscriber line carrier according to claim 1, wherein said test control circuit sends a battery voltage detection signal to a procedure signal control circuit in said remote terminal.