JPS617795A - Pb dial transmission system - Google Patents

Abstract

PURPOSE:To attain mute transmission to a subscriber by designating a PCM channel of a PB signal at PB disl transmission to a PCM codec while not controlling a TS time sharing switch circuit. CONSTITUTION:When an outgoing register RG receives a code of an abbreviated dial, it is informed to a central controller CC via a control line CL, the controller CC cuts off a channel between a line circuit LO and a register RG, closes the trunk circuit TO to connect the channel between the circuits LO and TO. The controller CC decodes an abbreviated dial after a prescribed time is elapsed and a PB dial transmission request is transmitted to the circuit TO via a line CL. When a trunk control circuit TPO in the circuit TO receives a transmission request, a PCM codec TAO to the standby mode to transmit a mute signal to the subscriber circuit thereby transmitting the mute PCM signal to the circuit LO.

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field of the Invention] The present invention relates to a PBB dialing system in a time division exchange.

[Technical background of the invention and its problems]

In the conventional PB dial transmission method f2, when transmitting a PB dial, the time division switch was disconnected to prevent the PBB dial from being encircled from the trunk circuit to the subscriber, and silence was transmitted to the subscriber. .

Furthermore, in order to monitor the PE dial, the above-mentioned processing was necessary to prevent the PBB dial from being enclosed. In the above method I, the communication path cannot be controlled when the MF dial is sent (and the control is complicated).

In particular, in a switch with a distributed function system that has a dial sending processor, a call path control processor, etc., control information must be transferred between the dial sending processor and the call path control processor when sending a PB dial, making the control complex and processing This led to a decrease in ability.

[Purpose of the invention]

The present invention eliminates the above drawbacks, does not reduce processing capacity, and
To provide a PBB dialing system which effectively transmits a PBB dial to a ζ two-station line and transmits silence to a subscriber at the time of transmitting the PB dial, with a small increase in cost.

[Summary of the invention]

This invention provides a PBB dial transmission system C2.
In an electronic exchange that has a dial output function, a time division switch function, and a silent transmission function, the PB double signal PCM channel to be transmitted to the PB dial transmission side and the central office line) v (
Cllanne! ) to the PCM codec, and the PCM codec (Codec) generates a silent PCM signal to the subscriber.
B-dial transmission, which is characterized by transmitting silence to the subscriber.

[Embodiments of the invention]

Figure 1 is a schematic diagram of the time division switch. CC is the central control unit, TS is the time division switch circuit, CL is the control line, HR is the PCM reception highway, HT is the PCM transmission highway, and PB is the PCM push button. dial generator,
HP is not allowed to send PCMPB. P B P
The CM push button dial generator may be provided within the line circuit (or may be provided commonly within the HTPCM transmission highway, but in this embodiment, it is provided separately from the T8 time division switch circuit). .

LO is a line circuit, its configuration is LCO telephone interface, LHO hybrid circuit, LAN P
CM: Consists of a codec, an LPO line control circuit, and an LSOPCM highway selector circuit. Press PB for the telephone (if there is no need to send a 7 button signal, press T S OP in the line circuit)
CM High Uniise 92 circuit is very necessary.

TO has one giant trunk, and its configuration is a TCO office line interface circuit, a THO hybrid circuit, and a T A
OP CM cococ, TPO) rank control circuit, T
It is composed of 92 SOP CM High Uniform circuits.

Referring to FIG. 1, an embodiment will be described in which a subscriber performs abbreviated dialing service on a central office line and sends a PBB dial to the central office line. When the subscriber picks up the handset, the LCO telephone interface 1 and 2 are activated and call information is transmitted to the CC central control circuit via the CL control line.

The CC central controller knows that the LO line circuit is calling, and the JTli from the LO line circuit to the G call register.
The dial tone signal F1ζ is connected, and a dial tone is sent from the T8 time division switch circuit to the LO line circuit. R/G transmission 1
/ When you receive the speed dial code on the register, the CL
The speed dial information is communicated to the CC central controller via the control line. The CC central control unit disconnects the communication path between the LO line circuit and the R/G transmission register, protects the TO) rank circuit, and connects the communication path between the LO line circuit and the To) rank circuit.

The CC central control unit connects the To) rank circuit and the LO line circuit, and after a certain period of time has elapsed, translates the speed dial and sends a PB dial sending request to the TO human 9f circuit via the C side control line.

'l' Q) TPO in the rank circuit) When the rank control circuit receives a PBB dialing request from the CC central + hq control circuit, it sends silence from the TOH9F circuit to the subscriber circuit. By putting the PCM codec into standby mode, a silent PCM signal is sent to the LO line circuit.

Here, standby mode refers to a mode in which the codec does not operate (normal output signals are not output). The simplest means of achieving this is to reduce the supply voltage to the codec. There is no particular limitation on the method for realizing this.

Also, since the TPO) rank control circuit sends a PBB dial to the office line, y) the TSO P CM highway selector circuit sends the H from the HTPCM transmission highway
In addition to sending out a switching signal to the PPCMPB transmission highway, the PCM channel /l/ (cha
nael) PB for all central lines by specifying all
B dial number is sent. When PBB dialing is completed, the TPO) rank control circuit moves the PCM codec, which sends audible tones from the central office line to the subscriber, from standby mode to active mode. Return from the transmission highway to the HTPCM transmission highway and change the original PC to the TAOPCM codec.
Specify M channel.

In this case, while the PB dial is being sent out, silence is sent to the subscriber from the PCM codec, and after the dial pulse is sent out, the subscriber can hear audible sound from the central office line. When sending a dial, it is possible to easily prevent the PB dial from being encircled by the subscriber.

〔Effect of the invention〕

In the above system, since the TS time division switch circuit is not controlled when sending out the PB dial, the processing capacity of the CC central control unit is increased, and the PB dial is sent out to the central office line in a simple manner. Can you send it out? In addition, the CC central control device
It is no longer necessary to control the S time division switch circuit, and effective functional distribution can be achieved by simply issuing a dial transmission request to the TO trunk circuit.

Furthermore, the present invention is not limited to the above embodiments. For example, the standby mode and active mode may be set not only by power control but also by circuitry.

Further, this mode setting is not limited to only the codec. In short, all that is required is to generate a silent PCM signal to the subscriber.

[Brief explanation of drawings]

FIG. 1 is a diagram showing the configuration of an embodiment of the present invention. LO, L1 Ni-line circuit LCO: Telephone interface circuit LHO: Hybrid circuit LAO: PCM codec LPO Ni-line control circuit I, LO: Telephone line LSO: PCM highway selector circuit To, T+:
Trunk circuit TCO: Office line interface circuit THO': Hybrid circuit TAO: PCM codec TPO Ni-line control circuit TTO: Office line TSO: P CM highway selector circuit CC: Central control unit TS: Time division switch circuit CL: Control line FIR: PCM Receiver Highway HT: PCM Transmission Highway HP: PCMPB Transmission No. 1 Transmission Top 1 Iway PB Push Button Dial Generator ILG: Transmission Register Agent Patent Attorney Kensuke Norichika (and 1 other person) Figure 1

Claims (1)

[Claims] (1) In an electronic exchange that has a PB dial sending function, a time division switch function, and a silent sending function, when sending a PB dial, the PCM channel of the PB signal to be sent to the central office line is specified to the PCM codec, and the subscriber A PB dial transmission method is characterized in that a PCM codec generates a silent PCM signal to transmit a PB dial to the central office line and transmit silence to the subscriber.