JPS58702B2 - Cross line ground disturbance test method - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention provides a Fagse Connection and Ground Test (Fagse Connection and Ground Test) conducted for each connection in order to ensure the normality of a switch network in an electronic exchange.
(hereinafter referred to as FCG test).

In electronic exchanges and crossbar exchanges, when link selection is complete and the switch communication path is set up, the switch network is tested for ground faults and crosstalk with other paths to ensure that the switch intersection is closed. Confirm that the call route is set.

In this case, in a crossbar exchange, the control device draws in the A, B, and C lines of the call trunk, and in an electronic exchange equipped with a ring signal trunk, a ring tone trunk, etc. in addition to the call ranks 1 to 1, these ring signals, By drawing in from the ringer trunk, we conduct tests for crosstalk, ground noise, disconnection, and double connections.

FIG. 1 is an explanatory diagram of crosstalk and ground fault.

Now, subscribers 5UBO and 5UB1 form a path within the switch network NW via the internal trunk IOT, while subscriber 5UB2 and a subscriber of another station form another path via the outgoing trunk OGT. In this case, for some reason, a ground fault may occur at the mermaid in the network NW, or crosstalk between both paths may occur at 8 points.

These problems are caused by wire scraps adhering to the switch or bent terminals of the switch, and most of them are caused by human causes.

FIGS. 2 and 3 are connection diagrams of the FCG test method in a conventional electronic exchange, respectively.

As shown in Fig. 2, the first place in forming a path is a switch frame, and multiple switch frames FO~
A network is constructed by overlapping FNs.

In conventional electronic exchanges, FCG tests are performed by providing one lead-in line from the ringer 1-rank RBT connected to each frame FO to FN, and connecting them multiple to the FCG detection circuit FCG/D. .

That is, since the ring trunk RBT is connected to the calling subscriber and the contact r is switched and connected to the FCG detection circuit FCG-D before the ring tone is sent out, a connection delay occurs.

The FCG detection circuit FCG-D determines that there is a ground fault by detecting earth air, and determines that there is crosstalk by detecting the potential of the battery (DC).

In the normal case, no potential is detected.

In FIG. 3, a drop-in line is provided from the ringing signal trunk RGT as well as the ringing tone 1-rank RBT.

The ringing trunk RBT is connected to the calling subscriber 5UBO, and before the ringing tone is sent out, contact r is switched to connect it to the FCG detection circuit FCG-D, while the called subscriber 5UB1 is connected to the ringing trunk 1 (GT is connected, and before the calling signal is sent out, contact r is switched and the FCG detection circuit FCG/D is activated.
Connect to.

However, in this case as well, there is a problem that a connection delay occurs due to a delay in sending out a call signal to the caller, and the actual communication path is a path ( A problem arises in that what is tested is the transmission path of the ringing tone and ringing signal, even though the path shown by the dotted line is the path shown by the dotted line.

The purpose of the present invention is to solve these problems by using FC of the path where the actual call is made without causing any connection delay.
The purpose of this invention is to provide a test method for conducting G tests.

Embodiments of the present invention will be described below with reference to the drawings.

Figures 4 and 5 show the internal trunk IOT, respectively.
FIG. 3 is a connection diagram of the FCG test method when the device is equipped with a ringing tone sending function.

In Fig. 4, a rank IOT is connected to the calling subscriber 5UBO in its own station 1, and before the ejection sound is sent from the trunk IOT in its own station, the contact r is switched and the FCG test circuit F
Connect to CG/D and perform the test.

In this case as well, the transmission of the ringing tone is slightly delayed, but the connection delay can be ignored since there is no need to change the connection of the trunk after the transmission of the ringing tone.

Also, the calling signal trunk R is sent to the called subscriber 5UB1.
, GT sends a paging signal, and when the called subscriber 5UB1 goes off-hook, the called subscriber 5UB1 is immediately reconnected to the local trunk IOT.

In this way, in FIG. 4, the route between the local trunk 10T and the calling subscriber 5UBO, that is, the path itself where the call is actually made, can be subjected to the FCG test.

Note that the internal trunk IOT is equipped with a two-winding relay, and since the relay itself has the function of a transformer, by adding one more winding, the ringing tone can be easily guided to the line.

In addition, in FIG. 4, although it is not possible to perform an FCG test on the path between the called subscriber 5UB1 and the trunk IOT within the own station, considering that the called subscriber 5UB1 becomes the calling subscriber, switching in the frame It is possible to test all paths centered on the receiving terminal of contact r.

Next, in FIG. 5, the called subscriber 5UBI is connected to the ringing signal trunk RGT, and during the period when the ringing signal is being sent, the called subscriber 5UB1 and the local trunk TOT
Since the primary switch in the path between
During this time, contact r is switched and connected to the FCC detection circuit FCG-D, and an FCC test is performed between the local trunk IOT and the occupied subscriber 5UB1 (up to the primary switch).

In Fig. 5, the operation of sending a paging signal to the called subscriber SUB is performed in parallel with the internal trunk IOT and the called subscriber SUB.
Since the actual communication path between UBs is tested, there is no connection delay at all, making it an ideal FCG test method.

In addition, as shown in Fig. 2, at least one ring trunk RBT and one switching contact r are provided in each of a plurality of frames, so that multiple connections are made in the horizontal direction of the exchange, and the FCG detection circuit FCG-D is connected. is easy to apply to large exchanges, but difficult to apply to small exchanges that require only one frame.

On the other hand, in the method shown in FIG. 4 or 5, the internal trunk I
Since the OT and the switching contact r can be arranged, it is convenient to apply it to a small exchange.

As explained above, according to the present invention, since the FCG test is performed on a completely idle path in parallel with the calling signal sending operation, there is no connection delay at all, and the path on which a call is actually made can be tested, and it is extremely effective when applied to small switching equipment.

[Brief explanation of drawings]

Fig. 1 is an explanatory diagram of crosstalk and ground fault, Figs. 2 and 3 are connection diagrams of the FCG test method in a conventional electronic exchange, and Figs. 4 and 5 each show an embodiment of the present invention. It is a connection diagram of the FCG test method. IOT: Internal trunk, r: Switching contact, RGT: Call month/1~rank, FCG-D: FCG detection circuit, NW
: Switch network, 5 UBO: Calling subscriber, 5
UB1: Called subscriber.

Claims (1)

[Claims] 1. In an electronic exchange that accommodates a call trunk equipped with a ring tone sending function and a ring signal trunk in a network, when setting a call path, and when sending a ring tone from the call trunk to the calling subscriber, While a calling signal is being sent from the calling signal trunk to the calling subscriber, the called subscriber side bus of the calling trunk is connected to a test circuit, and the connection between the calling trunk and the called subscriber is A crosstalk ground fault test method characterized by testing path crosstalk and ground faults.