JP2953896B2 - Key telephone equipment - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a T1 digital line (2
The signal of 4 communication paths is converted to a digital signal by PCM modulation and time division multiplexed at the same time, and 1.544 Mbit / s
Multiplexed on the line that produces the digital primary group signal)
Arbitrary channels required by four channels
Collision on PCM highway shared with analog line
The present invention relates to a key telephone device that can be efficiently accommodated without using a key telephone device.

[0002]

BACKGROUND ART FIG. 6 is a conventional T1 digital lines and A
1 shows a configuration of a key telephone apparatus accommodating a analog line . In FIG. 6, 1 is a key telephone main unit, 2 is a control unit for controlling the entire main unit, 3 is an analog line interface for connecting the main unit 1 to an analog line network, and 4 is a unit for connecting the main unit 1 and a digital line network. T1 digital line interface, 5 is a telephone interface for connecting the main unit 1 and the telephone 7, and 6 is a digital communication path switch unit.

Next, the operation of the above conventional example will be described.
In FIG. 6, 24 multiplexed on a T1 digital line
The PCM signal of the channel is transmitted to the P
A digital communication path switch unit which is directly connected to a CM highway (hereinafter, referred to as “PCM-HW”) and is provided with a PCM signal provided via the analog line interface 3 and a PCM signal provided via the telephone interface 5. 6 and the call is established.

On the other hand, PCM-HW silence data is provided via a digital communication path switch section 6 to a channel on a T1 digital line which is not used for communication in order to secure synchronization of the digital line. As a result, a signal always exists on an unused channel, and loss of synchronization of the T1 digital line can be prevented.

[0005]

However, in the above conventional example, the multiplexed PCM signal of 24 channels on the T1 digital line is directly transmitted to the P
Since it is connected to the CM-HW, if a T1 digital line is accommodated in a key telephone device, 24 PCM-HW time slots in the key telephone main device 1 are occupied irrespective of the number of required channels. I do. On the other hand,
The interface has an interface for 8 lines
PCM-HW time slot on T1 digital line
The T1 digital even though it is not actually used
Since it is occupied by the line interface,
Network line cannot be accommodated. (For example, T1
Digital line has 3 slots for PCM-HW time slot
If you want to use only the flannel, the remaining 21 (24-3 =
The time slot of 21) is related to not actually using
Occupied by the T1 line interface,
The analog line cannot be accommodated. ) Thus, T1
Only the necessary channels on the digital line cannot be accommodated in the key telephone device, and the key telephone device 1
The limited PCM-HW of the above could not be used effectively. Therefore, there is a problem that a small-capacity key telephone apparatus having no PCM-HW cannot accommodate a T1 digital line.

The present invention thus solves the problems of the prior art, and provides a method for multiplexing arbitrary data on a T1 digital line.
Time slot of the efficiency of the channel well PCM-HW
If there are remaining time slots, the remaining
Analog slots by assigning
It is an object of the present invention to provide a key telephone device that can also accommodate a telephone line .

[0007] The invention of claim 1 in order to achieve the above object, the analog line interface and T1 PCM-HW digital line <br/> interface and buttons within the telephone main device
Between the PCM signal selection unit and the code generation unit, thereby separating the PCM signal of the analog line and the PCM signal multiplexed on the T1 digital line from the PCM-HW in the key telephone main unit, The required channels are individually set in PCM-HW time slots so that they can be used.

According to a second aspect of the present invention, a digital communication path switch capable of handling a plurality of PCM highways is provided in place of the PCM signal selector.

According to a third aspect of the present invention, a three-state gate IC circuit is provided in place of the PCM signal selector.

[0010]

Therefore, according to the configuration of the first aspect, the PCM signal of the multiplexed 24 channels on the T1 digital line is converted by the PCM signal selector into the PM in the key telephone main unit.
Only the channels on the required T1 digital line are connected to the CM-HW and connected to the PCM-HW. And
A signal for securing synchronization is transmitted from the code generator to a channel not connected to the PCW-HW to prevent loss of synchronization. In addition, the time slot with excess PCM-HW in the main unit
PCM signal from analog line interface
Connected.

Thus, only the necessary channels on the T1 digital line can be accommodated in the key telephone device.

According to the second aspect of the present invention, any channel can be freely connected to a time slot on any PCM highway even in a large-capacity key telephone apparatus having several PCM highways.

According to the third aspect of the present invention, a small-capacity key telephone apparatus can be realized at low cost.

[0014]

Embodiment (First Embodiment) FIG. 1 shows the configuration of a first embodiment of the present invention. In FIG. 1, reference numeral 11 denotes a key telephone main unit. The key telephone main unit 11 includes a control unit 2 for controlling the entire main unit, an analog line interface 3 for connecting the main unit 11 to an analog line network, as in FIG. T1 digital line interface 4 for connecting main unit 11 to digital line network and multiplexing PCM signals on digital lines, telephone interface 5 for connecting main unit 11 and telephone line 7, and between telephone lines 7 or between telephone line 7 and analog line network Alternatively, a digital communication path switch unit 6 for converting and connecting digital line networks is provided. Further, the key telephone main unit 11 includes a PCM signal selection unit 12 connected between the T1 digital line interface 4 and the PCM-HW of the digital communication line switch unit 6 and a code generation unit 13 for ensuring synchronization of the T1 digital line. Prepare new.

Next, the operation of the above embodiment will be described. T1 digital lines is connected to a T1 digital line interface 4 is taken at 24-channel PCM signal sequence, likewise from the analog line interface
Is also guided to the PCM signal selection unit 12. The PCM signal selection unit 12 selects an arbitrary channel that is required, and sets the PCM-HW
Connect to any time slot.

FIG. 2 shows two channels of the T1 digital line .
The telephone line in a key telephone device and collect one analog line.
Shows the allocation conceptual diagram of a PCM-HW connecting a channel selected at any time slot of the PCM-HW with PCM signal selector 12 using the example shows the case of volume, T1 digital lines of the PCM signal .. Are assigned to the time slots TS1, TS2,... Of the PCM-HW. Also, among the PCM signals of each analog line, C
024 is allocated to the time slot TS24 of the PCM-HW. As a result, a telephone call with the telephone 7 can be made via the digital telephone line switch unit 6 in the same manner as a conventional telephone call with an analog line.

On the other hand, a code for securing synchronization is generated from a code generator 13 via a PCM signal selector 12 to a channel on a T1 digital line not connected to the PCM-HW. PCM on digital line
By transmitting the signal in the same manner as the signal, synchronization of the digital line is ensured.

FIG. 3 is a conceptual diagram showing an example of PCM-HW allocation, in which a code for securing synchronization is transmitted to a channel CH24 not connected to the PCM-HW.

As described above, according to the first embodiment,
The PCM signal selection unit 12 can arbitrarily interconnect a channel on the T1 digital line with a time slot on the PCM-HW in the key telephone main unit 11, and
There is an effect that synchronization of the T1 digital line can be easily ensured.

(Second Embodiment) FIG. 4 shows a configuration of a second embodiment of the present invention. 4 differs from FIG. 1 in that a digital communication path switch (matrix, switch) 14 is used instead of the PCM signal selection unit 12 in FIG.
Provided by the digital communication path switch 14.

In the second embodiment, several Ps
In the case of a large-capacity key telephone having CM-HW1 and HW2,
It is necessary to allocate channels to be used on the T1 digital line to several PCM-HWs. By using the digital communication path switch 14, any channel can be assigned to any time slot on any PCM-HW1 and HW2. Can be freely connected.

(Third Embodiment) FIG. 5 shows the configuration of a third embodiment of the present invention. 1 differs from FIG. 1 in that a three-state gate IC circuit 15 is provided instead of the PCM signal selection unit 12 shown in FIG.

In the third embodiment, the PCM-HW is set to 1
It can be implemented for a small-capacity key phone with a single PC, and the target for connecting the channel on the T1 digital line is one PC
M-HW.

In the third embodiment, the connection between the PCM-HW and the multiplexed PCM signal sequence on the T1 digital line is controlled by IC1, IC2, and IC3, so that the PC
Select the M signal. Then, at the timing of the required channel, IC1 and IC2 are turned ON and IC3 is turned OFF, and the channel on the T1 digital line can be connected to the PCM-HW. On the other hand, at the timing of unnecessary channels, IC1 and IC2 are turned off and IC3 is turned on, and a code for securing synchronization can be transmitted on the T1 digital line.

[0025]

As is apparent from the above embodiment, according to the first aspect of the present invention, a PC from an analog line is connected.
M signal and PCM multiplexed on T1 digital line
The signal sequence can be selected and controlled by the PCM signal selection unit on a channel basis, so that any channel multiplexed on the T1 digital line can be switched to the PC in the key telephone main unit.
Only the number of lines required for the time slots on the M-HW can be freely connected.

According to the first aspect of the present invention, the PCM-H
To a channel that is not connected to W, a code for securing synchronization is sent from the code generation unit via the PCM signal selection unit and is sent out on the T1 digital line, thereby preventing loss of synchronization. .

Therefore, only the desired channel on the T1 digital line is accommodated in the key telephone device.
Then, an analog line can be accommodated in the remaining PCM-HW.
Thus, the PCM-HW can be effectively used.

According to the second aspect of the present invention, the use of the digital communication path switch in the PCM signal selection section makes it possible to easily realize a large-capacity key telephone apparatus having several PCM-HWs.

According to the third aspect of the present invention, a small-capacity key telephone apparatus can be easily realized at low cost by using a three-state gate IC for the PCM signal selector.

[Brief description of the drawings]

FIG. 1 is a configuration diagram of a key telephone apparatus according to a first embodiment of the present invention.

FIG. 2 is a conceptual diagram of PCM-HW allocation in the first embodiment of the present invention (received PCM signal);

FIG. 3 is a conceptual diagram of PCM-HW allocation according to the first embodiment of the present invention (transmitted PCM signal);

FIG. 4 is a configuration diagram of a key telephone apparatus according to a second embodiment of the present invention.

FIG. 5 is a configuration diagram of a key telephone apparatus according to a third embodiment of the present invention.

FIG. 6 is a configuration diagram of a conventional key telephone device.

[Explanation of symbols]

 2 control section 3 analog line interface 4 T1 digital line interface 5 telephone interface 6 digital communication path switch section 7 telephone 11 main telephone apparatus 12 PCM signal selection section 13 code generation section 14 digital communication path switch section 15 3-state gate IC circuit

Claims (3)

(57) [Claims] 1. A key telephone apparatus for accommodating a digital line and an analog line in a mixed manner, wherein a digital line is connected to a key telephone main unit and a PCM signal on the digital line is transmitted.
A digital line interface unit for connecting, provided an analog line interface unit for converting the analog signal to a PCM signal, between the PCM Haiue b of both interface portions <br/> the said button in the telephone main unit the by selecting one of the PCM signals of both the interface unit, the PCM Haiue a function to connect allocated to time slots i, the digital line became not connected to the key telephone system inside the PCM Haiue Lee A key telephone apparatus provided with a PCM signal selection means having a function of transmitting a code for securing synchronization to a channel of the key telephone. 2. A preceding claim 1, key telephone system characterized by having a PCM highway multiple. 3. The method according to claim 1, wherein the PCM signal is selected.
Means key telephone system characterized by having a 3-state gate IC circuit.