SU1555903A1 - Method of transmission and reception of linear signals through two signal channels on connection between telephone exchanges automatic - Google Patents

Abstract

The invention relates to telephony. The purpose of the invention is to increase throughput by reducing the connection establishment time. To do this, in this method of transmitting and receiving linear signals over two signal channels, when a connection between the PBXs is established, the transmission of the initial state control signal to the first PBX is stopped after the decade dialing pulses are connected to the second PBX to the first signal channel of the receiver. Then, the termination of transmission from the second PBX of this control signal is fixed on the first PBX. After fixing on the first exchange, this termination of transmission is generated and ten-day dialing pulses or a disconnect signal are generated and transmitted. Given il. device that implements this method. 2 Il.

Description

The invention relates to telephony and can be used on urban and rural telephone networks on connecting lines between telephone exchanges compacted with pulse code modulation (PCM) or frequency division multiplexing (FRC) equipment.

The purpose of the invention is to increase throughput by reducing the time to establish a connection and reducing the amount of equipment

FIG. Figure 1 shows a structural electrical circuit diagram of a device that implements a method for transmitting and receiving linear signals over two signal channels when establishing a connection between PBXs located on the first PBX; in fig. 2 is a structural electrical circuit of the device implementing the method found by the HP of the second PBX.

A device that implements the method located on the first PBX contains a matching unit 1, a block 2 Fixing the absence of a control signal of the initial state, a block 3 monitoring the signal of the initial state, a block 4 receiving a signal of occupation, a block 5 determining pulse dialing, block 6 issuing dialing pulses, block 7 for monitoring the transmission of a signal for a signal, block 8 for fixing a signal for issuing a signal to busy, block 9 for issuing a signal for a busy and disconnecting signal.

The device located at the second PBX contains (FIG. 2) the matching unit 10, the receiver 11 decade dialing pulses, the unit 12 receiving signal control, the block 13 controlling the switching equipment

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vania, block 14, the output signal to remove the control of the initial state.

The device works as follows.

In the initial state, the output of block 13 receives a signal indicating the initial state (readiness) of the switching equipment of the incoming side. This signal, together with the logical signal from block 12, is allowed to give block 14 a source state control signal on the first signal channel to the outgoing PBX. Block 2 has a signal output that controls the operation of block 5 when receiving dialing pulses from the PBX. Work blocks

I and 2 is controlled by a signal received on the first signal channel from the incoming side, and block 8 is controlled by the output signals of blocks 4

and 7.

The busy signal comes from the PBX via wire d to block 4, where the signal from block 3 simultaneously arrives, indicating that the second PBX is ready to receive the busy signal. From the output of block 4, the busy signal goes to blocks 7 and 8. The latter captures and remembers the arrival of the busy signal from the exchange. This busy signal is then outputted by block 9 into the transmission path through the second signal channel to the oncoming (second) PBX. An incoming set after receiving and latching a busy signal stops transmitting the control signal to the initial state on the first signal channel not immediately after latching the busy signal, but only after connecting the receiver

I1 decade dialing pulses (register). The signal indicating the connection of the receiver 11 is a signal from the PBX to the second input of the block 12. If the signals to the block 12 match, the signals on the second signal channel from the outgoing side and the signal from the exchange to connect the receiver to 11 decadal dialing pulses block 12 generates a signal that, when it enters the input of block 14, ensures the response of the latter. As a result, block 14 stops the transmission of the baseline control signal over the first signal channel.

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The outgoing set, after transmitting the occupancy signal by block 7, waits for the termination of the arrival on the first signal channel of the receive path from the incoming set of the initial state control signal, which is a busy acknowledgment signal. The arrival of this signal is detected by block 2, which produces a signal that permits the issuance of ten dialing pulses to block 5.

In the event that the caller hangs up the handset before dialing, the disconnect signal generated by the outgoing PBX can be transmitted over the second signal channel only if there is a busy confirmation signal, i.e. in the absence of the control signal of the initial state on the first signal channel. To fulfill this condition, block 7 is established in the outgoing kit.

Claims (1)

Claims The method of transmitting and receiving linear signals over two signal channels when establishing a connection between automatic telephone exchanges (PBX), consists in that the signal of the control of the initial state transmitted from the second PBX is sequentially recorded on the first PBX busy signal, fix it on the second PBX, stop transmitting the control signal of the initial state, form the first PBX and transmit the ten-day dialing pulses or the disconnect signal to the second PBX characterized in that, in order to increase the bandwidth of the connection establishment time reduction, the transmission of the initial state control signal to the first exchange is carried out after ten dialing pulses are fixed at the first exchange to the first signal channel of the receiver from the second PBX of this control signal, the formation and transmission of decadal dialing pulses or a disconnect signal is carried out after fixing and. 1 t gsk | tn From PBX signal