KR20010057332A - A unit to handle signaling functions for telephone sets of Public Switched Telephone Network - Google Patents

Abstract

PURPOSE: An apparatus for processing signaling for a PSTN telephone is provided to be used for a telephone subscriber unit of a transmission apparatus to effectively perform signaling process to the PSTN telephone. CONSTITUTION: A downward signaling processing unit(210) sets up the state of a subscriber line interface circuit(300) as one state in power interruption, stand-by, active, reverse polarity, and ring states according to the signaling bit received from a upward side through an E1 signal and a hook signal of a telephone(310). An upward signaling processing unit(220) generates signaling bit according to the hook signal and a make busy signal transmitted from a downward side through the subscriber line interface circuit and transmits unused signaling bit after fixing the signaling bit as fixed value.

Description

A unit to handle signaling functions for telephone sets of Public Switched Telephone Network

The present invention relates to a signaling processing apparatus, and more particularly, to a signaling processing apparatus for a public telephone network telephone for processing signaling for a telephone connected to a public switched telephone network (PSTN).

1 is a block diagram of an E1 signal, one frame 120 is composed of 32 channels (CH 0 to CH 31), one channel has a data rate of 64Kbps, one frame has a data rate of 2.048Mbps Have In addition, 16 frames are collected to form one multi-frame 110.

At this time, channel 16 of frame 0 is used for multi-frame synchronization, and channel 16 of the other frame is channel dedicated to signaling. That is, signaling bits for channels 1 and 17 are inserted into the upper four bits and the lower four bits in channel 16 of frame 1, and signaling bits for channels 2 and 18 in channel 16 of frame 2, respectively. In the same way, in the 16th channel of the 15th frame, the signaling bits for the 15th and 31st channels are inserted into the upper four bits and the lower four bits, respectively.

That is, the signaling bit is carried down in timeslot 16 of the E1 signal in the down direction, of which signaling is performed using the A and B bits. Even in the uplink, the current subscriber's state must be sent in the signaling bit.

On the other hand, an optical subscriber carrier (FLC System: Fiber Loop Carrier System) connected to a public telephone network (PSTN) often transmits data through an E1 signal. These transmission devices have a telephone subscriber unit for connection with a telephone subscriber in a subscriber transmission unit located at the subscriber side, and the telephones of the respective subscribers are connected to the telephone subscriber unit.

More specifically, each of the telephones is connected to a subscriber line interface circuit (SLIC) of the subscriber unit to receive signaling control, and the subscriber line interface device detects a hook state of the telephone connected to itself in addition to the signaling process. It also performs the function. In addition, the subscriber unit must perform a function of generating signaling bits to be transmitted to the upstream side according to the state of the telephone.

Therefore, the telephone subscriber unit of the transmitting apparatus controls the telephone line by controlling the subscriber line matching device according to the signaling signal of the E1 signal transmitted from the uplink side in case of the downlink, and generates the signaling signal according to the state of the telephone line in the uplink side. There is a need for a device that performs functions efficiently.

Accordingly, the present invention has been made to meet the above needs, and provides an apparatus for processing signaling of a public telephone telephone network by interworking with a subscriber line matching device which is used in a telephone subscriber unit of a transmission apparatus to control a telephone. Its purpose is to.

In order to achieve the above object, the signaling processing apparatus for a public telephone network telephone according to the present invention is configured to determine the state of the subscriber line matching device according to the signaling signal received through the E1 signal and the hook signal of the telephone. Down-signaling processing means for setting to one of a power-off, standby-by, active, reverse polarity, and ring states; And an uplink signaling that generates signaling bits according to a hook signal and a make busy signal, which are transmitted from the downlink through the subscriber line matching device, and transmits them upwards, while fixing unused signaling bits to a fixed value. Characterized in that it comprises a processing means.

1 is a configuration diagram of an E1 signal;

2 is a block diagram of a signaling processing apparatus according to the present invention.

* Explanation of symbols for main parts of the drawings

120: E1 frame 140: signaling bit

200: signaling apparatus 210: downlink signaling processing means

220: uplink signaling means 300: subscriber line matching device

310: telephone

Hereinafter, with reference to the accompanying drawings will be described in detail the present invention.

2 is a block diagram of a signaling processing apparatus 200 according to the present invention, which is used in a subscriber unit of a subscriber-side transmission apparatus. In this case, the signaling processing apparatus 200 includes a downlink signaling processor 210 and an uplink signaling processor 220.

The downlink signaling processing unit 210 receives subscribers according to the signaling bits (A bits, B bits) received through the E1 signal from the upstream and the hook signal of the telephone 310 received through the subscriber line matching device 300. The state of the line matching device 300 is set to one of power off, standby-by, active, reverse polarity, and ring states.

There are four bits of A, B, C, and D signaling bits. In Korea, C bits and D bits are fixed to '0' and '1', respectively, and signaling is performed using only A and B bits.

The functions according to the signaling bits received by the downlink signaling processor 210 in the downlink (direction from the transmitter to the telephone) are shown in Table 1 below.

In addition, the control signal (D0, D1, GST) output by the downlink signal processing means 210 to control the subscriber line matching device 300 according to the state of each signaling bit and the subscriber line matching device according to the control signal ( The operation of 300) is shown in Table 2.

Signaling bits Contents A B One 0 Hook On, Busy Status (Hook Off) 0 0 Ring 0 One Polarity Inversion One One Make Busy

D0 D1 GST Status of Subscriber Line Matching Device 0 0 0 Power down One One 0 Stand by One 0 0 Active One 0 One Reverse polarity 0 One 0 Ring

That is, when the A bit is 1 and the B bit is 0, the downlink signaling processing unit 210 outputs a control signal of "110" when the hook state of the phone 310 is '1' (ON). Make the standby state (Stand-By) 300, and if the hook state of the phone 310 is '0' (OFF) outputs a control signal of "100" to activate the subscriber line matching device 300 (Active) ) The activated state means a "Busy" state and means that the handset of the telephone 310 is lifted.

If the A bit is '0' and the B bit is '0', the control signal of "010" is output to make the subscriber line matching device 300 in a ring state, and the A bit is '0'. If the B bit is '1' and outputs a control signal of " 101 " to make the subscriber line matching device 300 in reverse polarity.

In addition, when the A bit is '1' and the B bit is '1', and when the "Make Busy" signal is '1', a control signal of "000" is outputted to the subscriber line matching device 300. Make it Busy.

On the other hand, the uplink signaling processing unit 220 generates a signaling bit according to the hook signal and the local circuit closed signal (Make Busy) transmitted from the phone 310 through the subscriber line matching device 300 and transmits to the uplink side.

At this time, the functions of the signaling bits to be generated by the uplink signaling means 220 in the uplink (from the telephone to the transmitter) are shown in Table 3 below.

Signaling bits Contents A B 0 0 Hook Off One 0 Hook on One One Local line closure

In other words, if the local circuit closed signal (Make Busy) is '1', the state should be informed to the power station, so the A bit is set to '1' and the B bit is set to '1'.

In addition, if the hook state of the phone 310 is '1', the hook-on state should be informed to the powerhouse, so the A bit is set to '1' and the B bit is set to '0', and the hook state of the phone 310 is set to '0'. ', The hook-off state should be informed to the player, so set the A bit to' 0 'and the B bit to' 0 '.

The A, B, C, and D bits thus set are inserted into the E1 signal and transmitted to the power station.

On the other hand, since the C bit and the D bit are not currently used in Korea, it is fixed to an arbitrary value.

When the present invention is used in the subscriber side unit of the transmission apparatus, it is possible to effectively perform signaling processing for the public telephone network telephone.

Claims (1)

An apparatus for processing a signaling signal for a telephone in cooperation with a subscriber line matching device for controlling a signaling state of a public telephone network telephone, According to the signaling bit received through the E1 signal from the upstream side and the hook signal of the telephone, the state of the subscriber line matching device is turned off, standby-by, active, and reverse polarity. And downlink signaling means for setting to one of a ring state; And An uplink signaling process for generating signaling bits according to a hook signal and a make busy signal transmitted from the downlink through the subscriber line matching device and transmitting them upwards, while fixing unused signaling bits to a fixed value. Signaling processing device for a public telephone network telephone, characterized in that it comprises a means.