JPH06112955A - Digital line connector - Google Patents

Abstract

PURPOSE:To attain the connection of plural terminal equipments by giving a signal distribution and multiplex transmission function with respect to a transmission reception bus to an interface of an ISDN line and a high speed digital line whose line speed is 1.5Mbps or over. CONSTITUTION:The connector is a device that connect a line side interface to plural terminal equipments with a high speed digital line having a line speed of 1.5Mbps or over, each terminal equipment is provided with a branch section 6 distributing a reception signal 1a from the line side to each terminal equipment 5 and connected to a reception bus 3, and a logic coupling section 7 transmitting a transmission signal 2b from each terminal equipment 5 to the line side and connected to a transmission bus 4, and the logic coupling section 7 is featured to operate AND/OR processing between the transmission signal 2b from the terminal equipment connected directly and the transmission signal 2b outputted from other adjacent logic coupling section 7 for multiplex transmission.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a digital line connection device for connecting an ISDN line or a digital leased line to a transmission device.

[0002]

2. Description of the Related Art In recent years, a method of replacing one large device with several small devices, which is called downsizing, has become popular in the computer world. This is because, due to the improvement in the performance of the small-sized device, the same effect can be obtained at a lower cost by using a combination of inexpensive small-sized devices than by using an expensive large-sized device. Similarly, in the field of communication, a downsizing wave from a large device to a small device is about to occur.

However, since the high-speed interface of ISDN or digital leased line is specified on the assumption that it is connected to a large-sized device, it is difficult to connect to a small-sized device. Therefore, an expensive large-sized device should be used. I was connected to a slower interface that would be more expensive.

[0004]

For example, the ISDN line has two interfaces of 192 kbps and 1.5 Mbps. 2 channels for 192kbps, 23 for 1.5Mbps
If you use as many channels as possible, which corresponds to a telephone line of channels, 1.5 Mbps is more advantageous in terms of basic charges and construction costs. However, the 192 kbps interface has a rule to connect terminals with 1 to n, but 1.5 Mbps
There is only a one-to-one connection with the interface of 1), and it was not possible to connect to an ordinary terminal or the like.

This is the same with an interface for a digital leased line, and a high-speed interface is more advantageous in terms of charges, but a transmission device (TDM, etc.) that connects one-to-one to an interface of 1.5 Mbps or more. It was necessary to use, and the equipment cost was expensive.

The present invention has been made in consideration of the above circumstances, and has a signal distribution and multiplex transmission function for a transmission / reception bus for an ISDN line or high-speed digital line interface having a line speed of 1.5 Mbps or more. By letting
The present invention provides a digital line connection device that enables connection of a plurality of terminals.

[0007]

FIG. 1 is a block diagram showing the basic configuration of the present invention. In FIG. 1, the present invention is an apparatus for connecting a line side interface and a plurality of terminals by a high-speed digital line having a line speed of 1.5 Mbps or more, and distributes a received signal 1a from the line side to each terminal 5. Each of the terminals is provided with a branching unit 6 connected to the reception bus 3 and a logical coupling unit 7 connected to the transmission bus 4 for transmitting the transmission signal 2b from each terminal 5 to the line side. Is a digital line connection device characterized by performing a logical product / logical addition processing of a transmission signal 2b from a directly connected terminal and a transmission signal 2b output from another adjacent logical coupling unit 7 and performing multiplex transmission. .

The logical combination unit 7 is provided with an AND circuit, and while a predetermined terminal is transmitting / receiving to / from the line side, all the other terminals stand by in a state of transmitting a positive logic signal to perform a logical product process and to the line side. It is preferably configured to multiplex.

The logical combination unit 7 is provided with an OR circuit, and while a predetermined terminal is transmitting / receiving to / from the line side, all the other terminals stand by in a state of transmitting a negative logic signal to perform OR processing and to the line side. It is preferably configured to multiplex.

In the present invention, the received signals 1a, 1b are
The transmission signals 2a and 2b are high-speed digital signals having a line speed of 1.5 Mbps or higher. High-speed digital lines are used for the reception bus 3 and the transmission bus 4. The branching unit 6 includes an output circuit that amplifies and outputs a signal, a connector that distributes the signal, and the like. The logic coupling unit 7 is configured by an AND logic circuit / OR logic circuit that logically processes a signal, an output circuit that amplifies and outputs the signal, a connector that is connected to the transmission bus 4, and the like. The terminal 5 includes a receiving unit that receives a signal on the line side, a transmitting unit that transmits a signal from the terminal side, and a control unit that controls each signal.

[0011]

According to the present invention, in FIG. 1, a device for connecting a line side interface and a plurality of terminals by a high speed digital line having a line speed of 1.5 Mbps or more, receives a received signal 1 from the line side. The branching unit 6 connected to each terminal on the bus 3 distributes it to each terminal 5, and the transmission signal 2b from each terminal 5 is transmitted to the line side by the logical coupling unit 7 connected to each terminal on the transmission bus 4. To be done. Also, the logical connection unit 7
Is the logical product of the transmission signal 2b from the directly connected terminal and the transmission signal 2b output from the other logical coupling unit 7 adjacent to
Performs OR processing and multiplexes.

The logical connection unit 7 is composed of an AND circuit (AND logic circuit), and while a predetermined terminal is transmitting and receiving to the line side, all other terminals transmit a positive logic signal (all "1"). Since the logical product processing is performed by waiting at, the line can be multiplexed.

The logical connection unit 7 is composed of an OR circuit (OR logic circuit), and while a predetermined terminal is transmitting and receiving to the line side, all the other terminals transmit a negative logic signal (all "0"). Since the logical sum processing is performed by waiting at, it is possible to perform multiplex transmission to the line side.

[0014]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described in detail below with reference to two embodiments shown in the drawings. The present invention is not limited to this.

FIG. 2 is a block diagram showing a first embodiment of the digital line connecting apparatus of the present invention. In FIG. 2, a terminal-side interface 8 connected to a line (bus) for each terminal
And a line side interface 9 for making these terminal side interfaces 8 look as if they were directly connected to a line, and the receiving bus 3 and the transmitting bus 4 are configured by connecting these interfaces 8 and 9 in series. To do.
Further, the receiving bus 3 and the transmitting bus 4 of the line side interface 9n at the final stage to which the terminal 5 is not connected are terminated by a terminating resistor 10.

The reception signal 1a coming from the line side is the reception bus 3
The transmission signal 2b from each terminal 5 is distributed to the reception section of each terminal 5 by each terminal side interface 8 connected to the transmission signal 2b transmitted from another adjacent AND logic 7a.
Is multiplexed on the line side by the connected AND logic 7a on the transmission bus 4.

FIG. 3 is a time chart showing the timing of the multiplex transmission processing of the present invention. In FIG. 3, the reception signal 1a coming from the line side is distributed to the receiving section of each terminal 5 by the reception bus 3, and each terminal 5 receives only the reception signal 1b corresponding thereto from among them. Also, during transmission of such terminals, the signal of the transmission unit of other terminals is all "1".
And output to the transmission bus 4. The transmission bus 4 has an AND logic 7a, and all "1" is ignored and each terminal 5
Only the transmission signal 2b transmitted from the transmission unit of the above is multiplexed and becomes the transmission signal 2a to the line side.

FIG. 4 is a block diagram showing a second embodiment of the digital line connection device of the present invention. In FIG. 4, the terminal side interface 8 is set to only one of the first stages, and the buses of the subsequent stages are set to the TTL level by the bus driver 11 and the bus receiver 12. From the second stage, the bus receiver 12 receives the signal, and the open collector buffer 1
3 forms an AND logic by a signal transmission and a wired logic. Further, the time chart showing the timing of the multiplex transmission processing of the second embodiment is the same as that of the first embodiment, and therefore its explanation is omitted.

Although the first and second embodiments in which the AND logic circuit 7a is provided as a means for logically processing the transmission signal 2b from each terminal 5 have been described above, the same applies to multiplex transmission by an OR logic circuit (not shown). Is processed.
That is, during transmission of such a terminal, if the signal of the transmission unit of another terminal is set to all "0" and output to the transmission bus 4, the portion of all "0" is ignored and the transmission unit of each terminal 5 Only the transmitted transmission signal 2b is multiplexed and becomes the transmission signal 2a to the line side.

[0020]

According to the present invention, it becomes possible to connect inexpensive devices in combination to a high-speed digital line, and it is possible to reduce the cost of equipment.

[Brief description of drawings]

FIG. 1 is a block diagram showing the basic configuration of the present invention.

FIG. 2 is a block diagram showing a first embodiment of a digital line connection device of the present invention.

FIG. 3 is a time chart showing the timing of the multiplex transmission processing of the present invention.

FIG. 4 is a block diagram showing a second embodiment of the digital line connection device of the present invention.

[Explanation of symbols]

 1 reception signal (line side) 2 transmission signal (line side) 1a reception signal (terminal side) 2a transmission signal (terminal side) 3 reception bus 4 transmission bus 5 terminal 6 branching unit 7 logical connection unit 7a AND logic, 8 terminal side Interface 9 Line side interface 9n Line side interface 10 Termination resistor 11 Bus driver 12 Bus receiver 13 Open collector buffer

Claims (3)

[Claims] 1. A device for connecting a line side interface and a plurality of terminals by a high speed digital line having a line speed of 1.5 Mbps or more, and distributing a received signal (1a) from the line side to each terminal (5). Branch (6) connected to the receiving bus (3)
And a logical coupling unit (7) connected on the transmission bus (4) for transmitting the transmission signal (2b) from each terminal (5) to the line side for each terminal, and the logical coupling unit (7) Is characterized in that the transmission signal (2b) from the directly connected terminal and the transmission signal (2) output from the other adjacent logical combination unit (7) are subjected to logical product / OR processing and multiplexed. Digital line connection device. 2. The logical combination unit (7) is provided with an AND circuit, and while a predetermined terminal is transmitting / receiving to / from the line side, all other terminals wait in a state of transmitting a positive logic signal, thereby performing a logical product process. 2. The digital line connection device according to claim 1, wherein multiplex transmission is performed on the line side. 3. The logical combination unit (7) includes an OR circuit, and while a predetermined terminal is transmitting / receiving to / from the line side, all other terminals are in a state of transmitting a negative logic signal and waiting for OR processing. 2. The digital line connection device according to claim 1, wherein multiplex transmission is performed on the line side.