JPH03181293A - In-home communication method for I interface - 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] [Field of Industrial Application] The present invention relates to an in-home communication system for an I interface, and more specifically, it relates to the configuration of an in-home terminal system in accordance with the international standard I interface. This relates to the communication (F) method that enables connection to an external network during communication between terminals.

[Prior Art] As shown in Figure 2, in the configuration of a home terminal system in the conventional international standard 'IIJJ I interface, a bus is formed in which a plurality of terminals 'rE1 to '1'En are connected to a common medium in multiple ways. In this system, there is a known mutual communication system for a bus connection system that enables mutual communication between two channels on ■ channels by variably controlling the transmission information rate allocation ratio of two opposing terminals using a terminal controller TEC. There is.

As this drag type, for example, Japanese Patent Application Laid-Open No. 61-245697
Examples include those described in the publication No.

[The problem to be solved by the invention] The above-mentioned conventional technology has the following problems: ■ When an activation request is received from an external network during communication between terminals connected to a bus on the same premises line at the interface, or There was a problem in that the case where a call was initiated to the network was not considered, and communication with an external network was not possible while the terminals were communicating with each other.

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, the present invention aims to provide (1) an in-home communication system for an interface that can simultaneously perform mutual communication between terminals and communication with an external network.

[Means for solving the problem] The above purpose is to control the connection between the network side and the terminal side so that information data for mutual communication between terminals uses the B1 channel, and data for network side communication uses the B2 channel. control,
The phases of mutual communication between terminals and communication on the network side can be made distantly related by synchronizing the phases using PLL means.

[Function] The in-home communication system for interface of the present invention is such that when there is an incoming call activation request from the network side to another terminal on standby connected to the same in-home line via bus during mutual communication between the terminals, the inter-terminal communication The phase of the communication is synchronized with the communication phase on the network side using a phase synchronization circuit, and the mutual communication information between terminals is transferred to the B1 channel.
By inputting communication information with the network side into the two channels, mutual communication between terminals and communication with the network side according to a well-known sequence can be performed simultaneously.

Furthermore, if another terminal on standby connected to the same private line via bus makes a call activation request to the network side during mutual communication between terminals,
A call request is transmitted to the terminal control device using D channel bits. As in the case of incoming call activation described above, the terminal control device synchronizes the communication phase between the network side and the terminal, and enables simultaneous communication using two B channels.

[Example code] An embodiment of the configuration of the present invention will be described based on FIG.

As an example, in the known bus connection system shown in FIG. 2, when an incoming call is activated from the network side to the terminal 'rE3 while mutual communication is being carried out between the end device and the TE2. A case will be described in which a call is initiated from the terminal TE3 to the network side.

In Fig. 1, 1 is a receive circuit that receives signals from the terminal, and 2 is a separation circuit 3 that separates information for mutual communication between terminals and information for network communication sent to the station side. a multiplexing circuit that multiplexes information on mutual communication between terminals and information on network side communication received from the station side; 4 a transmission driver that sends a signal to the terminal; 5 a first clock extraction circuit for mutual communication between terminals; 6 is a second clock extraction circuit for network side communication, and 7 is a phase synchronization circuit for the clocks extracted by the I-th and second clock extraction circuits 5 and 6.

8 in FIG. 2 is the terminal control device shown in FIG.

First, while the end device and the terminal TE2 are communicating with each other, the terminal TE3
A case will be explained in which there is an incoming call activation request from the network side. In FIG. 1, terminal-to-terminal mutual communication is received by a receive circuit 1, transmitted by a separation circuit 2 to a multiplexing circuit 3 of only 81 channels, and transmitted by a driver circuit 4 to a terminal TE2. At this time, it operates with the phase extracted by the first clock extraction circuit 5. When an incoming call activation request is generated from the network side to the terminal TE3, the inter-terminal communication phases extracted by the first and second clock extraction circuits 5.6.

The network side communication phase is phase synchronized by the phase synchronization circuit 7 using PLL means, and the network side information is transferred to the B2 channel by the multiplexing circuit 3.
multiplex it with the B1 channel and send it to the end device and TE2 side, and the information received by the receive circuit 2 is sent to the demultiplexing circuit 2, where the B1 channel is sent to the multiplexing circuit 3 and the B2 channel is sent to the network side. This allows communication between the end devices, I'E2, and communication between the terminal TE3 and the network side to be performed simultaneously.

Next, a case will be described in which the terminal TE3 initiates a call on the network side while the end device and the terminal TE2 are communicating with each other. The operation of mutual communication between terminals is as described above. So the terminal TE
3 transmits a call activation request to the network side to the terminal control device 8 using the bits of the D channel, and the separation circuit 2 detects the call activation request and transmits it to the network side. By following the same incoming call sequence, mutual communication between terminals and communication on the network side can be performed simultaneously.

Therefore, communication with the network side is possible even during communication between terminals, and channels can be used effectively.

[Effects of the Invention] In the (1) interface home communication system according to claims 1 and 2, communication can be switched to the network side during a call between terminals, so there is an effect of reducing the number of busy states.

Furthermore, since mutual communication between terminals and communication with the network side can be performed simultaneously, there are also effects such as effective use of channels.

[Brief explanation of drawings]

FIG. 1 is a block diagram of a terminal control device showing an embodiment of the present invention, and FIG. 2 is a block diagram of a bus connection of a plurality of terminals in a conventional I interface. DESCRIPTION OF SYMBOLS 1... Receive circuit, 2... Separation circuit, 3... Multiplexing circuit, 4... Transmission driver, 5... First clock extraction circuit, 6... Second clock extraction circuit ,7・
...Phase synchronization circuit, 8...Terminal control device.

Claims (1)

[Claims] 1. In the I interface internationally standardized by CCITT's I.430, when controlling the connection between the network side and the terminal side, information data for mutual communication between the terminals uses the B1 channel, Data for external communication is controlled to use the B2 channel, and by synchronizing the phase of mutual communication between terminals and communication on the network side, it is possible to communicate with the external network at the same time as mutual communication between terminals. An in-home communication system for I-interface characterized by: 2. In the I interface internationally standardized by CCITT's I.430, when controlling the connection between the network side and the terminal side, there is a receive circuit that receives signals from the terminal, and an output from the receive circuit is transmitted between the terminals. a separation circuit that separates mutual communication information and network side communication information to be sent to the station side;
a multiplexing circuit that multiplexes information on mutual communication between terminals separated by the separation circuit and information on network side communication received from the station side; a transmission driver that sends the output of the multiplexing circuit to the terminal; and a terminal. a first clock extraction circuit that extracts a clock signal from information on communication between networks; a second clock extraction circuit that extracts a clock signal from information on communication on the network side; A terminal control device is equipped with a phase synchronization circuit that synchronizes the phase of the clock that is input to the demultiplexing circuit and the multiplexing circuit, and uses the B1 channel for mutual communication information between the terminals, and for out-of-network communication. Data is controlled to use the B2 channel and the phases of mutual communication between terminals and communication on the network side are synchronized, so that communication with an external network can be performed simultaneously during mutual communication between terminals. In-home communication system for I interface.