JPH02143767A - Line concentrator for telephone line - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial Field of Application) The present invention relates to an east line where meeting telephone lines used during telephone line construction are concentrated within a telephone office.

(Prior Art) Conventionally, for example, a single meeting telephone line for 600 subscribers per cable was accommodated as is, or
Either 5 to 10 pairs of meeting telephone lines are connected in parallel and accommodated in the exchange, or an east line machine is used that selectively connects meeting telephone lines with DC blockage to the exchange immediately after DC blockage. Ta.

(Problem to be Solved by the Invention) However, in the system in which the meeting telephone lines are accommodated as they are in the exchange, the number of accommodation terminals for the exchange is equal to the number of meeting telephone lines, and there is no problem if there are only a few meeting telephone lines. ,
As the number of telephone lines increases to several tens or hundreds, the utilization rate of the telephone line decreases, which is uneconomical.Also, the method of connecting multiple telephone lines in parallel and then connecting them to an exchange is
There are problems such as a decline in call quality due to an increase in capacitance.
In addition, a concentrator that selectively connects a DC-blocked meeting telephone line to an exchange immediately after the DC blockage can solve the above problem, but it is difficult for the caller to distinguish between the meeting telephone line and the normal subscriber's telephone line. The drawback was that it was not possible.

The purpose of the present invention is to reduce the number of lines on the exchange side compared to the number of lines on the meeting telephone line, thereby increasing economic efficiency, and at the same time, reducing the deterioration of call quality by connecting the meeting telephone line with DC blockage to the exchange on a one-to-one basis. It is an object of the present invention to provide a line concentrator that sends out an identification signal before connecting to an exchange so that the caller can confirm that the caller is connected to the line concentrator.

(Means for Solving the Problems) The present invention provides a system for detecting direct current blockage of individual meeting telephone lines when connecting a plurality of meeting telephone lines to exchange side lines whose number is smaller than the plurality of meeting telephone lines. and a monitoring circuit that receives a meeting telephone line blockage signal from the monitoring circuit to detect the connection state between the meeting telephone line and the exchange side line, and detects whether all of the exchange side lines are connected to any of the meeting telephone lines. If all of the lines on the exchange side are not connected to any of the meeting telephone lines, a busy signal tone is output to the blocking signal generating meeting telephone line. and a line connection control circuit for connecting the blockage signal generating meeting telephone line to the exchange side line after transmitting an identification signal to inform that the telephone line will be connected to the exchange side line. It's on Shusen-sama.

(Function) In the meeting telephone line concentrator configured as described above, when any meeting telephone line is blocked by direct current, the monitoring circuit sends a meeting telephone line blockage signal to the line connection control circuit, and the line The connection control circuit detects the connection status between the meeting telephone line and the exchange side line, and when all of the exchange side lines are already connected to any of the meeting telephone lines, a busy signal tone is generated to generate a blockage signal on the meeting telephone line. A blockage signal is generated when any of the lines on the exchange side is not connected to any of the line on the exchange side.After an identification signal is sent to notify that the line on the exchange side is connected to the line on the exchange side, a blockage signal is generated. The signal generation meeting telephone line is connected to the exchange side line.

(Effects of the Invention) As described above, the present invention transmits an identification signal to the meeting telephone line that generates the blocking signal before connecting to the exchange, and allows the calling party to confirm the connection of the meeting telephone line. By connecting the telephone line to the line on the exchange side, the number of lines on the exchange side is reduced compared to the number of lines on the meeting telephone line, and the number of lines on the exchange side is reduced to improve economic efficiency, without affecting the line connection or call characteristics. This has the advantage that the meeting telephone line can be connected to the exchange on a one-to-one basis.

(Example) Next, the configuration of an example of the present invention will be described with reference to the drawings.

Each meeting telephone line T11 to TL4 is connected via an input terminal 1 and a monitoring circuit 2 in which photocoupler PCI to PC4 is connected in series with each line in order to detect DC blockage of each meeting telephone line TLI to TL4. Switch 3, in this case relay contacts RL10, R[11, R[20, R[21
~R[41] connected to the communication path switch 3,
The output of the communication path switch 3 is relay contact RL50, RL
51 to the terminal 5 of the exchange side line TLO and the identification signal tone generator 6 for sending out the identification signal.
It is connected to two systems: an identification signal generator 6 for sending an identification signal to inform the blocking signal generation meeting telephone lines TLI to TL4 that they are connected to the exchange side line TLO, and the exchange side line. Ding LO is meeting telephone line T
If the telephone line is already connected to one of L1 to TL4, the closing signal does not occur. Meeting telephone line T L 1
It is connected to a signal tone generator 7 for sending a waiting signal to be outputted to the terminal L4.

Relay contacts RL10, R[11, RL20, RL21 to RL41 of these communication path switch 3 and changeover switch 4
, RL50, and R[51 input the meeting telephone line blockage signal from the monitoring circuit 2, and connect the I10 port 9 and CPU10゜I connected to each other via the data bus 8.
+OMI 1 , each relay contact R[10 connected to RAM 12 and I10 boat 9 via relay driver 13
, RLll, R[20, R[21~RL41, RL50
, RL51, respectively, are controlled on/off by a line connection control circuit 14 of a microcomputer, which is comprised of relays RL1 to ItL5 corresponding to RL51.

In addition, in the figure, B is a DC power supply battery, R1-R8 are resistors inserted in the telephone line, etc., ZDI-ZD4 are Zener diodes connected in parallel with each photocoupler PC1-PC4, D1, 2 indicates a transformer for each signal tone generator 6.7.

Next, the operation of this embodiment will be explained according to the flow chart of FIG.

In the case of the meeting telephone line concentrator 15 configured in this way, it is reset when the power is turned on, and R is set in step 101.
By clearing AM12 and initializing the I10 port 9 in step 102, the relays RL1 to RL5 are in the off state shown in FIG. In addition to monitoring, each meeting phone call @ TLI ~
Each input terminal 1 is used to control the connection between Tl-4 and the line on the exchange side, and to connect a handset for line testing on the meeting line side.
, the transformer ■2 of the signal tone generator 7 each resistor R1
~The voltage of battery B is applied via R4, and when a DC loop is formed by connecting the line test handset on the meeting line side, battery B (+) - → transformer ■ 2 → each rail Contacts RLIO to RL40 → Each resistor R1 to R4 → Each input terminal 1 → Each meeting V Telephone line T[1・~■1.4 → Each input terminal 1 → Each Zener diode ZD1 to ZD4 → Each relay contact RLII to R [41 → Battery B (-) circuit is formed and current flows, and this current generates voltage across Zener diodes 701 to 704, turns on transistors TRI to TR4 of photocoupler PCI to PC4, and turns on the monitoring circuit. The output of 2 changes from H to L, and the formation of the loop is transmitted to the l/~O boat 9.

Further, the CPU 10 synchronously monitors the I10 boat 9, and when a loop is detected and there is no other line in use or waiting, the CPU 10 records the line where the loop has occurred and turns on the line switch 3. After transmitting the identification tone from the identification signal tone generator 6 for a certain period of time, the changeover switch 4 is turned on and the looped line is connected to the central office line via the output terminal 7, that is, the terminal of the line TLO on the exchange side. Connect to 5.

If the line for which a call path has been formed as described above remains open for a certain period of time, the call path switch 3 and changeover switch 4 are turned off to terminate the call, the call registration is deleted, and at this point If there is a line that is currently being held, a series of connection operations such as sending out an identification tone and connecting to a central office line is performed on the line, and at the same time, the holding registration of the line is canceled and a call is registered.

In this case, the order of registration is in the order of registration, that is, in the order of loop formation, and call registration is performed from the line with which the loop was formed first, and registration registration is the line that is transferred to call registration. Calls that are abandoned while waiting are deleted, and when a loop is created on a new line, or when there is a line that is currently being called or is being held, it is registered.

The above control is performed as follows according to the flowchart of FIG.

That is, in step 103, n=i is set, and in step 104, it is determined whether or not there is a blockage (hereinafter also referred to as a loop) of this first meeting tli talk number and 1TLI, and a state in which no loop is formed is determined. In step 105, it is determined whether the first meeting telephone line 1 is registered for a call or not, and if the call is registered, a subroutine of step 106 checks to see if the call is in an end state.

That is, in step 107 it is determined whether or not the end call flag is 1, and when the end call flag is 0, the end call flag is set to 1 in step 108, and then in step 109 a timer is started and the process returns to set the end call flag. When is 1, step 11
If the timer is set to 0, it is determined whether or not the set period of time has elapsed, and if the time has not elapsed, it returns as is.
When the timer passes the set tiz, step 111
The call registration for the first meeting telephone line L1 is deleted, the call end flag is cleared in step 112, relays R1 and R5 are turned off in step 113, and the identification tone flag is cleared in step 104. Thereafter, in the subroutine of step 115, it is checked whether or not there is a waiting state.

That is, in step 116, it is determined whether or not there is a cross-holding registration;
If there is no meeting registration, the process returns as is, and if there is a meeting registration, the first place in the meeting order is registered as a call in step 117, and the first place in the meeting order is registered in step 118.
In step 119, the waiting order is determined, and in the subroutine of step 120, a communication path is established.

That is, after the call end flag is cleared in step 121,
Step 122'C - Call registration corresponding line relay In this case, the relay RLI is turned on, and in step 123 it is determined whether the identification tone flag is -1, and the identification tone flag is set to O.
After setting the identification sound flag -1 in step 124, the timer is started and returned in step 125, and when the identification sound flag is 1 in step 123, it is determined in step 126 whether or not the timer is longer than the set time r. If it is smaller than ■, return as is, and if it is larger than -, turn on relay R5 and set the communication path of the first meeting telephone line TLI, then step 12
In step 8, it is determined whether or not the meeting has been registered, and if the meeting has been registered, the meeting registration is canceled in the subroutine of step 129.

That is, in step 130, the first meeting telephone line TL
1 is deleted, and step 131
After the holding order is moved up in step 132, monitoring is performed on the n+1 meeting telephone lines TL1 to TL4, in this case,
The second meeting telephone line TL2 is set, and if r)>4 is not set in step 133, the entire meeting telephone line TL1 is set.
~ Since the monitoring of TL4 has not been completed, the process returns to step 104, and if n>4, all meeting telephone lines T11 to TL4 are
Since the monitoring of the telephone lines TLI to TL-4 has been completed, the process returns to step 103, and the meeting starts from the beginning of the monitoring of the telephone lines TLI to TL-4.

On the other hand, in step 104, the first meeting telephone line T
When it is determined that a loop has formed in L1, it is determined in step 134 whether there is a call registration for the first meeting telephone line TLI, and if it is not registered, it is determined in step 135 whether or not there is a call registration, and the waiting registration is completed. If yes, it is determined in step 136 whether or not the first meeting telephone line TL1 has been registered as a meeting, and if it has not been registered as a meeting, the first meeting telephone line TL1 is registered as a meeting in step 137. In step 138, the first telephone call in the order of availability is registered, and in step 136, the first meeting telephone line TL? Even when the meeting has already been registered, the call with the first place in the meeting order is registered in step 138, the meeting registration with the first place in the meeting order is canceled in step 13, and the meeting order is moved up in step 140. After that, in step 141, the call path setting subroutine
In addition to setting the communication path by steps 21 to 127, step 1
Even if there is no meeting registration at step 35, a call route is set by the call route setting subroutine at step 141.

Also, in step 134, the first meeting telephone line [1
When the call is registered, it is determined in step 142 whether the call registration is n, in this case, the first call, and if it is the first, a call path is set in the subroutine of step 141, and if it is not the first, it is determined. In step 143, it is determined whether or not the first meeting telephone line L1 is registered as a stock.
If the meeting has been registered, the process returns to step 103, and monitoring of the meeting telephone lines TL1 to TL4 is started from the beginning.If the meeting has not been registered, the process proceeds to step 144, where the first meeting telephone line TL? After the meeting is registered, step 1
Returning to step 03, monitoring of the meeting telephone lines T11 to T4 is started from the beginning.

In this way, in the case of this concentrator for meeting telephone lines, a blockage signal is generated for meeting telephone lines L1 to TL4 before connection to the exchange.
Send an identification signal to the caller and contact the telephone line TL1~
By connecting the blockage signal generation meeting telephone line T11 to 7L4 to the exchange side line TLO- while confirming the connection of TL4, the meeting telephone line T11 to 7L4 can be connected without causing any trouble to the line connection or call characteristics. By reducing the number of lines on the exchange side compared to the number of lines in the exchange and increasing economic efficiency, the DC-blocked meeting telephone line TLI to L4 can be connected to the exchange.
A one-to-one connection is possible.

In this example, the case where there is 1 output for 4 inputs is shown, but as shown in FIG. By selectively connecting at 3', it is possible to easily increase the scale of the meeting telephone line frame i.

[Brief explanation of the drawing]

Figure 1 is an electrical circuit diagram of one embodiment of the present invention, Figures 2 and 3 are
The figure is a flowchart, and FIG. 4 is an electrical block diagram of another embodiment of the present invention. 1... Input terminal 2... Monitoring circuit 3...
Call path switch 4... Selector switch 5... Terminal 6... Identification signal generator 7... Waiting signal tone generator 15... Line concentrator for meeting telephone line

Claims (1)

[Claims] a monitoring circuit for detecting direct current blockage of each meeting telephone line when connecting a plurality of meeting telephone lines to a number of exchange side lines smaller than the plurality of meeting telephone lines;
Upon receiving a meeting telephone line blockage signal from the monitoring circuit, a connection state between the meeting telephone line and the exchange side line is detected, and all of the exchange side lines are already connected to any of the meeting telephone lines. When a busy signal tone is output to the blocking signal generating meeting telephone line, and when all of the lines on the exchange side are not connected to any of the meeting telephone lines, a busy signal tone is output to the blocking signal generating meeting telephone line. and a line connection control circuit that connects the blockage signal generation meeting telephone line to the exchange side line after transmitting an identification signal to notify that the line is connected. Machine.