JPH0744707B2 - Subscriber line aggregation device - Google Patents

Description

The present invention relates to a subscriber line aggregating apparatus for accommodating a plurality of subscriber lines, aggregating the subscriber lines into a small number of lines, and outputting the aggregated lines to an exchange.

[Conventional technology]

Conventionally, as a device having this kind of aggregation function, a switchboard,
PBX and the like are known.

[Problems to be solved by the invention]

However, all of them are large-scale devices, and are small-scale subscriber line aggregating devices (for example, accommodating and aggregating a plurality of subscriber lines that are used only infrequently for some kind of meetings, etc.). The use of these devices, even when they are desired, was too expensive and unsuitable. Some conventional aggregation devices (switches, PBXs, etc.) send a busy tone to a new caller on the incoming line when all outgoing lines are blocked, but keep silent. However, there was also a lack of serviceability in that it did not positively inform that the outgoing line was blocked.

The object of the present invention is suitable as a small-scale subscriber line aggregating apparatus, that is, the cost is low because the configuration is simple, and a waiting sound is always emitted when the outgoing line is blocked. An object of the present invention is to provide a subscriber line aggregating apparatus having a high serviceability of transmitting to a caller.

[Means for solving problems]

To achieve the above object, in the present invention, in the subscriber line aggregation device, a line setting unit that scans each subscriber line while turning on and off a line setting switch provided in the middle of each subscriber line, When a caller of the subscriber line of No. 1 makes a loop off-hook to form a loop, a loop detection unit, a line control unit, a waiting sound sending unit, and a waiting sound sending control unit are provided.

[Action]

The line setting unit scans each line while turning on and off a line setting switch provided in the middle of each subscriber line. When the caller on any of the subscriber lines goes off-hook and the line setting switch of the line is turned on by the line setting unit, the loop detection unit detects that a loop is formed. The line control unit, to which the detection output from the loop detection unit is input, stops scanning of the line setting unit at that time, holds the line setting switch of the off-hooked subscriber line in the ON state, and connects to the exchange.

On the other hand, under the condition that the loop detection unit generates the detection output, the remaining lines except the line in off-hook are selected and the waiting sound transmission unit is connected, and if there is a call on the line, A waiting tone is sent to the caller.

In the conventional aggregation device (exchange, PBX, etc.), the loop detection circuit is required for the subscriber line, but in the aggregation device according to the present invention, if the loop detection circuit is provided in common by adopting the scanning method. The configuration is simpler because it is done. Regarding the scanning method, the line setting switch is frequently turned on and off, which causes a problem of wear, but if you use an optical switch such as a photo MOS switch rather than a mechanical relay switch as much as possible, wear will occur. The problem of can be solved advantageously.

〔Example〕

Next, an embodiment of the present invention will be described with reference to the drawings. FIG. 1 is a schematic configuration diagram showing a subscriber line aggregation device (N: 1 subscriber line aggregation device that aggregates N subscriber lines into one) as an embodiment of the present invention.

In the figure, 1 ₁ to 1 _N are line setting switches, that is, line setting switches for connecting the telephones 10 ₁ to 10 _N to subscriber terminals of the exchange 11 (preferably a photo MOS switch is used). Is. Reference numeral 2 denotes a loop detection unit that detects when _one of the telephones 10 ₁ to 10 _N goes off hook and a corresponding line setting switch is turned on to form a loop, 3 a line control unit, and 4 a clock. The generation unit 5 is a line setting unit.

The line setting unit 5 receives a scan command from the line control unit 3 and first turns on and off the line setting switch ₁₁ (channel CH-1), then the line setting switch 1 ₂ (channel
CH-2) ON, is turned off, the next turn on the switch 1 ₃ (channel CH-3), is turned off, also the switch Once this way finally turn on the switch 1 _N (channel CH-N), is turned off It functions to scan the line setting switches ₁₁ to 1 _N (channels CH-1 to N) sequentially by returning to ₁₁ (channel CH-1) and turning them on and off.

The line control unit 3 is composed of, for example, a counter, and counts the clock from the clock generation unit 4 to generate a binary code (channels CH-1 to N) consisting of a plurality of bits as an address for scanning the line setting unit 5. Is generated and output. Line setting section 5
Can also be said to be a decoder that receives and decodes this identification code.

6 melody tone generator for generating a melody of a meeting sound, namely when a plurality of telephones of the telephone 10 ₁ to 10 _N is in the off-hook state at the same time, since the phone is connected to the exchange is one and the remaining It is a melody sound (waiting sound) generation unit for notifying the telephone of the waiting time. 7 _{1 to} 7 _N are waiting sound sending switches that are closed when sending waiting sound to each telephone.
Are provided corresponding to N. Reference numeral 8 is a power supply unit that supplies power necessary to operate the subscriber line aggregation device, 9
Is a display section that indicates which of the line setting switches 1 ₁ to 1 _N is in the ON state (which line is in use), and 10 ₁ to 10 _N are connected to the subscriber line aggregation device ( A telephone set 11 is accommodated), and 11 is an exchange.

FIG. 2 is a timing chart showing the operating state of each part in FIG.

The circuit operation of the embodiment shown in FIG. 1 will be described with reference to FIGS. First, when power is supplied from the power supply unit 8, the clock (FIG. 2 (a)) generated by the clock generation unit 4 is supplied to the line control unit 3, whereby the line control unit 3 operates as already described. work, an instruction to turn on and off to scan in accordance with channel setting switch 1 ₁ to 1 _N to the timing of the clock to the line setting unit 5.

Scan state started in this way (Fig. 2 (b))
(G)) continues until any of the telephones 10 ₁ to 10 _N accommodated in the subscriber line aggregation device goes off-hook.

Then the example telephone 10 ₁ trying the call is to have off-hook (FIG. 2 (h)), the loop detecting unit 2 performs loop detection at the timing line setting switch 1 ₁ is turned on corresponding to the telephone 10 ₁ (FIG. 2 (i)) Since this is notified to the line control unit 3, the line control unit 3 instructs the line setting unit 5 to stop scanning the line setting switch. This way, the line setting scan switch 1 ₁ is in the ON state is stopped, switch 11 dial tone to the telephone 10 ₁ is returned from the possible call.

Also, when other phones other than telephone 10 ₁ at this time is off-hook, for delivering waiting tone to the phone,
When the loop detection unit 2 detects a loop, the melody sound generation unit 6 is turned on, and in response to a command from the line setting unit 5, a waiting sound transmission switch (in this case, 7) that belongs to the channel in which the line setting switch is off. By turning on the waiting sound sending switches other than ₁ , the desired waiting sounds can be sent (Fig. 2 (k)-
(N)). The line use display unit 9 also has a line setting unit 5
By sending a signal indicating which line setting switch remains in the ON state, the channel of the telephone in communication can be lit and displayed.

Turning next to hook the telephone 10 ₁ for call termination, this will inform detects this loop detection unit 2 to the line control unit 3, to either again telephone 10 ₁ to 10 _N is off-hook, line setting unit 5 Scan state continues due to.

FIG. 3 is a schematic configuration diagram showing a subscriber line aggregating apparatus (N: 2 subscriber line aggregating apparatus that aggregates N subscriber lines into two) as another embodiment of the present invention. Compared to the embodiment shown in FIG. 1, this embodiment has twice the number of line setting switches, loop detectors, and line setting units, and additionally, waiting sound transmission control units 13 _{1 to} 13 _N and AND. Gate 12
Is required.

Since the circuit operation is basically the same as that of the embodiment shown in FIG. 1, the different points will be described below.

Scan the line setting switch 1 _1-1 to 1 _{N- 1} by the line setting unit 5 ₁ and the line setting switch 1 _1-2 to 1 by the line setting unit 5 _2.
The scan of _N-2 is executed at different timing. Also when both of the loop detection unit 2 ₁ and 2 ₂ has generated the detection output to turn on state melody sound generating unit 6 detects that the at AND gate 12.

Waiting sound transmission control unit For example, 13 ₁ (channel CH-
1), the output of AND gate 12, when both of the loop detection unit 2 ₁ and 2 ₂ is generated a detection output (i.e., when all egress line leading to the exchange 11 is blocked), know that It becomes operational. And channel CH-
Monitors the two line setting switch 1 _1-1 1 _1-2 belonging to 1, when either one is on, so as not to turn on the waiting sound delivery switch _71, two line setting switch only 1 _1-1 1 _1-2 when both off together, and performs a control operation to turn on the waiting sound delivery switch _71. The other waiting sound transmission control units function similarly.

As the line control unit 3, the control becomes complicated when the number of line setting units, loop detection units, and line setting switches increases in this way. In such a case, a counter is used instead.
CPU (central processing unit) is used. Line control unit 3 in that case
An outline of the flow of operations executed by the CPU is shown in FIG.

In FIG. 4, the step (b) is the function of the AND gate 12 in FIG. 3. However, since the AND gate 12 is included in the ordinary line control unit 3, it is convincing if such a consideration is made. Ah The other steps may not need to be explained again.

FIG. 5 is a block diagram showing an embodiment of the present invention when n lines are aggregated into m channels, and it is also a block diagram showing a configuration corresponding to the operation flow of FIG.

〔The invention's effect〕

As described above, the subscriber line aggregating apparatus according to the present invention makes it possible to detect an off-hook from any of a plurality of subscriber lines with a loop detecting unit having a much smaller number than that. Therefore, there is an advantage that the circuit configuration becomes simple and contributes to downsizing, weight reduction, price reduction, and high reliability.

Further, the subscriber line aggregating apparatus according to the present invention can be used in a conventional exchange or PBX as long as it is used in a low frequency as a subscriber line.
There is an advantage in terms of cost and installation space when used instead of the above, and when the line is blocked, a waiting tone is always sent to the caller, so there is no lack of serviceability.

[Brief description of drawings]

FIG. 1 is a schematic configuration diagram showing a subscriber line aggregation device (N: 1 subscriber line aggregation device that aggregates N subscriber lines into one) as an embodiment of the present invention, and FIG. FIG. 1 is a timing chart showing the operating state of each part, and FIG. 3 is a subscriber line aggregating apparatus (an N: 2 subscriber who aggregates N subscriber lines into two) as another embodiment of the present invention. FIG. 4 is a schematic block diagram showing a line aggregation device), and FIG. 4 is a chart showing an outline of a flow of operations executed by the CPU as the line control unit 3 in FIG.
FIG. 5 is a configuration diagram showing an embodiment of the present invention when n lines are aggregated into m channels. Explanation of symbols 1 ₁ to 1 _N ...... Line setting switch, 2 ... Loop detector, 3
...... Line control unit, 4 ... Clock generation unit, 5 ... Line setting unit, 6 ... Melody sound generation unit, 7 _{1 to} 7 _N ... Meeting sound sending switch, 8 ... Power supply unit, 9 ... Line Usage display, 10 ₁ to 10 _N …… Telephone, 11 …… Exchange

Claims (1)

[Claims] 1. A subscriber line aggregating device for accommodating a plurality of subscriber lines (n lines), aggregating into m channels smaller than n lines, and outputting to a switching system (where n and m are integers). (A) A line setting switch that accommodates n switches for each channel, and connects between each of the subscriber lines and the exchange.
A total of m × n line setting switches for enabling connection through any of the m channels, and (b) each of the n line setting switches accommodated in each channel, A line setting unit for endlessly repeating the operation of turning on the state for a certain period of time and then returning to the off state, in total of m line setting units, and (c) the n number of the line setting units accommodated for each channel. Of each line setting switch, that is, a loop detection unit provided for each channel, and when any of the line setting switches belonging to the same channel is turned on by the line setting unit, the subscriber line is looped. A loop detection unit for detecting whether or not the state is present, wherein a total of m loop detection units, (d) a waiting sound generation unit, and (e) are provided in association with each of the n lines, A waiting-sound-sending control unit for connecting the waiting-sound-generating unit to a line, wherein one of a total of n waiting-sound sending control units, and (f) the m loop detection units, or When a plurality of loop detection units detect a loop state, the detection output is received, and with this as an opportunity, the line setting unit belonging to the channel to which the loop detection unit belongs is instructed,
The waiting sound transmission control that belongs to the subscriber line corresponding to the other line setting switch that is not in the ON state by keeping the line setting switch in the ON state as it is at the timing when the loop detection unit detects the loop state And a line control unit for instructing the subscriber line to connect to the waiting sound generation unit, and (g) when all of the m loop detection units detect a loop state, the detection output is received. A means for activating the waiting sound generating section to output a waiting sound, the subscriber line aggregating apparatus.