KR960004715B1 - Network termination unit of isdn - Google Patents

Abstract

The apparatus for combining telephone functions of network terminal equipment(NTE) and ISDN includes a NTE(3), a S-interface(5), and a power supply(6). The NTE includes an U-interface(31) and a S-interface(33) connected to the U-interface through a ISDN oriented module(IOM) bus. The S-interface(5) includes a codec(56) performing voice communication, and a processor(51) controlling ISDN level 3 and call. The power supply includes a normal power supply(62) providing +40 V to the S-interface, a network power supply providing +5 V to the NTE, and a switch(63) switching the normal power to the NTE in emergency.

Description

Integrated Information Network Terminal

1 is a general ISDN configuration diagram.

Figure 2 is an exemplary view of the CCITT specification for power dispatch during normal power supply.

3 is an exemplary view of the CCITT specification for limited power dispatch.

4 is a structural diagram of a general information network terminal according to the present invention;

* Explanation of symbols for main parts of the drawings

3: NTE 5: ISDN Phone

6: feeder 31: hybrid

32: U interface 33: S interface

51: processor 52: LCD

53: keypad 54: RS223C communication unit

55: LAPD 56: Cortec

57: S interface 58: LED

61: dispatcher 62: commercial feeder

63: feed switch 64: S feed section

The present invention relates to an ISDN terminal apparatus combining a NET (Network Terminal Equpment) and an Integrated Services Digital Network (ISDN) telephone function.

1 is a general ISDN configuration.

NTE is an indoor device for transmitting digital data in both directions with two wires. It provides an S interface for connecting up to eight ISDN terminals with a U interface. The ISDN terminal connects to the S interface to establish a call and exchange information by the ISDN User Network Interface (UN) protocol.

The ISDN terminal can be operated by means of power supply from the AC commercial power source, the battery, and the NTE in the subscriber's home as the power source, and the NTE can be powered from the AC commercial power source, the battery, and the network as the power source. ISDN phone is a representative ISDN handset with voice call as a basic function, but the power consumption is excessively small and functionally required compared to the existing analog phone by using processor and high-performance ISDN dedicated device to perform ISDN UNI protocol. . Since battery use in ISDN phones is limited in battery life, bulky, and above all possible in NTE, ISDN phones typically operate on power or fed from NTE. Among the existing analog terminals, wireless telephones, answering machines, and facsimile phones consume excessive power, so calls are made using commercial power. However, a phone that provides only basic voice calls can operate with low power of 100mW or less, so it can operate with power feeding in the network, and thus can receive service regardless of commercial power in the subscriber's house.

In case of abnormal power supply, ISDN telephones should receive power from the NTE. If the battery is used in the NTE, it must be powered for a long enough time, but it is also limited in time. In addition, when the battery is used in NTE, sealing current must flow to prevent corrosion and deterioration of transmission quality in the pressurized magnetic path from the network to the NTE. In the case of the existing analog telephone, the current flows through the line by -48V in each call, so there is no need to consider a separate current (Seal Current), but it becomes a necessity as it becomes an ISDN.

Accordingly, an object of the present invention is to provide an ISDN terminal apparatus that enables an ISDN subscriber to receive basic voice call service even when a commercial power supply in a subscriber's home is abnormal by operating the present invention even with limited power supply of a network.

In order to achieve the above object, the present invention, a 2BIQ ECM (Echo Cnacellation Method) with a code for the transmission of a 2B + D signal in both directions to the network via a two-wire line, a two-wire four-wire hybrid (Hybrid), and U An NTE including an U interface device provided as an interface element (PEB2093), and an S interface device connected to an U interface element through an IDN (ISDN Oriented Module) bus and connected to an S interface line; S interface unit (PEB2085) for connecting to the U interface of the NTE, LAPD control unit (PEB2085) to perform the ISDN layer 2 function, Cortec (PSB2165) having an AD / DA changer to enable voice calls, and called number A keypad for inputting a back light, a liquid crystal display for displaying subscriber number, billing information, and terminal status, an RS-232C connection for monitoring terminal operation status, and ISDN telephone functions. An S interface having a processor unit Inte187C252 for performing a (CALL) control function; When the commercial power is normal, input AC power in the range of 80V to 260V to provide + 40V power for feeding to S interface via AC / DC converter. Always receive power from the network to operate the NTE at + 5V, and the power supply unit used as a power source when the commercial power supply is abnormal, and the S power supply unit that supplies + 40V of polarity reversed to the non-designated terminal when the commercial power supply abnormality is connected to the grid power supply unit. And a power supply means connected to the power supply unit and the commercial power supply unit and configured as a relay so that the ISDN telephone function operates as a commercial power supply when the commercial power is normal, and operates a power supply switch when the commercial power is abnormal. It is characterized by including.

In the present invention, when the commercial power in the subscriber's home is abnormal, the NTE is supplied from the network and supplied to the ISDN telephone, and as in the CCITT recommendation, only one terminal is operated in the case of limited power supply, and in consideration of the technical power utilization efficiency of the power supply. It describes in detail the ISDN terminal that performs NTE and ISDN telephone functions together.

Figure 2 is an illustration of the CCITT White Book recommendation for a power interruption when home commercial power is normal. CCITT defines NTE power supply as normal power supply when home's commercial power is normal. Normal power supply network feeds 500mW to NTE (600mW is allowed by the end of 1994), and NTE maintains synchronization with network even when commercial power is abnormal. It operates by network feed so that it can be maintained, and the feed to S interface in NET is made with commercial power.

FIG. 3 is a diagram illustrating CCITT White Book recommendation for power interruption when the home commercial power supply is abnormal. CCITT defines NTE power supply as the limited power supply when the home's commercial power is abnormal, the limited power supply network feeds 1100mW (Allow 1300mW by the end of 1994) to the NTE, and NTE continuously maintains the synchronization with the power supply. Since no power source is available, feeding on the S interface is done at power-on at NTE, inverting the feed electrode to feed at least 420mW. In addition, CCITT Recommendation I.430 designates one ISDN terminal for limited dispatch to enable basic voice calls with 380mW of power consumption, and its non-diameter ISDN terminal detects a reverse polarity and prevents it from operating in power dispatch. Restrict.

In order to enable power dispatch, a terminal capable of operating in power dispatch must first exist. However, there is a big difference from CCITT's power consumption of 380mW, and there are no technical investigations on power supply system, power supply voltage and current value, and subscriber line characteristics. In the case of Japan, the U-power transmission is different, but the U-interface transmission method is different from EBI-based 2BIQ and Japan-based TCH method, so the power failure detection of subscribers is different. It does not carry out dispatch at all, and it detects and supplies power in the limited feeding state. In case of 2BIQ of ECH, the NTE should operate as a dispatch in normal feeding state.

4 is a configuration diagram of an ISDN terminal according to the present invention, in which 3 is NTE, 5 is an ISDN telephone, 6 is a power supply unit, 31 is a hybrid, 32 is a U interface, 33 is an S interface, 51 is a processor, and 52 is a LCD, 53 for keypad, 54 for RS232C communication, 55 for LAPD, 56 for codec, 57 for S interface, 58 for LED, 61 for power feed, 62 for commercial feed, 63 for power switch, 64 for S feed Represent each.

As shown in the figure, it consists of an external interface of the present invention, a U interface line connection for connecting to a network, an S interface line connection for connecting ISDN terminals, and a terminal for using a commercial power source. The features completely separate the NTE and ISDN phone functions and are connected by the S interface and operate on the same power supply.

First, the NTE function is divided into the U interface 32 and the S interface unit 33, and the U interface line unit uses a 2BIQ ECM (Echo Cnacellation Method) line code as a transformer for transmitting 2B + D signals to the network in both directions, It consists of a 2-wire to 4-wire hybrid, and a U interface element (PEB2093), which wakes up to be activated in A / D and D / A conversion and power down. Wake-up, Echo Cancellation, Equalization, Gain Control, Scrambling, Descrambling, CRC Calculation, Timing Recovery, 2BIQ Frame Transmission It has IOM (ISDN Oriented Module) interface function and processor interface function. In addition, the U interface element reports the status of the feeder to the network using the PS1 (Power Status 1) and PS2 (Power Status 2) bits of the 2BIQ Super Frame, and immediately from the It performs the function of getting more power.

The S interface unit 33 is connected to the U interface element through the IOM bus, and is composed of an S interface element (PEB2080) and a transformer. The S interface element has an S / T interface transmission function according to CCITT I.430, an IOM bus and S It has functions such as frame change between / T interface, timing recovery, D channel access control, and activation / deactivation procedure.

The ISDN telephone function includes an S interface unit (PEB2085) 57 that connects to an NTE, a LAPD control unit (PEB2085) 55 that performs ISDN layer 2 functions, and a Cotec (PSB2165) that has an AD / DA converter and enables voice calls. 56, the keypad 53 for inputting the called number, the LCD 52 for outputting the calling party number and the charging information and the terminal status, the RS-232C connection function for monitoring the terminal operation status, and the ISDN telephone It is divided into a processor unit (Intel 87C252) which performs overall control of functions and performs ISDN layer 3 and call control functions. The LAPD controller 55 has multiple data link setup and division, HDLC framing, and buffer functions.

The codec 56 has functions such as CCITT G.711 and G.714 compatibility, handset and speaker phone connection, DTMF transmission, tone and ring generation, and the like.

The processor unit 51 uses a device including RAM and ROM as well as a timer and SIO to reduce power consumption as much as possible. In addition, since the processor unit 51 can monitor the functions of all parts of the present invention, it monitors the functions of the NTE and displays the LEDs.

The LED display unit 58 displays the result of detecting the S interface activation state from the S interface element (PEB2085) of the ISDN telephone, which is a result of the power state and the processor control unit detecting the U interface activation state from the U interface element PEB2093. It displays according to control of 51.

The power supply-related function includes a commercial power supply unit 62, a net power supply unit 61, an S power supply unit 64, and a feed switch unit 63.

The commercial power supply unit 62 inputs AC power in the range of 80V to 260V when the commercial power supply is normal, and provides + 5V power supply for operating the ISDN telephone function of the present invention through the AC / DC converter, and + 40V power supply for feeding to the S interface. It performs the function of providing a feed switch unit 63 and the S feed unit 64 is connected. The network feeder 61, which receives power from the network, is composed of a DC / DC converter (PSB2121), connected to the U interface line, and always receives power from 8 to 70V from the network to operate the NTE function at + 5V. The feed switch 63 allows the ISDN telephone function to operate in a power dispatch. Further, the feeder 61 connects with the S feeder 64 to supply + 40V of polarity inversion to the non-designated terminal via the S feeder 64 when the commercial power supply is abnormal to know that the power supply is in a limited power supply state. There are two methods of feeding the network from the NTE: the constant voltage feeding method and the constant current feeding method. S feed unit 64 is composed of a relay (Relay) and DC / DC converter (PSB2121) is connected to the network feeder 61 and the commercial feeder 62 and input 32 to 70V to input + 40V of constant voltage to the S interface It has the function of feeding power in Phantom Mode. When commercial power is normal, other terminals connected to S interface by the power of commercial power supply are used when + 5V of network feeder 61 and commercial power feeder 62 are used as control signals. When the commercial power supply is abnormal, the relay operates to reverse the polarity to the power supply of the network feeder and feeds about 40mW so that each terminal of the S interface can detect the limited power supply state. The power supply switch 63 is connected to the power feeding unit 61 and the commercial power feeding unit 62 and is configured as a relay so that the ISDN telephone visual function operates as the commercial power when the commercial power is normal, and operates by the power feeding when the commercial power is abnormal. do.

Looking at the power consumption of the present invention, the maximum power consumption in the IDLE (Power Down) and active (ACTIVE) state of the main elements are as follows.

According to the DC / DC efficiency when the inputs are 1100 and 1300mW, the power that can be consumed by the present invention is as follows, and it can be seen that the power consumption can be sufficiently satisfied.

The features of the present invention are summarized as follows.

First, in the present invention, in order to reduce the power consumption of the ISDN telephone function block in limited power supply, the ROM (ROM) and RAM (RAM) outside the processor are not used, and only the ROM included in the processor is used.

Second, the combination of the NTE and the designated terminal does not require the use of a DC / DC converter in the designated terminal as compared to when implemented separately, which leads to a significant increase in the efficiency of power feeding from the network to the terminal. In other words, if the DC / DC conversion efficiency is n (0 <n <1), it is n × n when the NTE is separated from the designated terminal, and 0.64 when it is separated considering that n has a value of about 0.8 to 0.9. It is about 0.81, which can be seen that to increase the power utilization efficiency to make a one-piece compared to 0.8, 0.9 for the one-piece. Therefore, the amount of power reduced by the DC / DC converter of the NTE and the designated terminal operating in the power supply is reduced, making it easier to implement the NTE and the designated terminal that conforms to the CCITT power specification.

Third, the use of the present invention limits physically to only one designated terminal connection on the S interface in the subscriber's home. When two or more designated terminals are connected on the S interface, several designated terminals require power supply, and thus all designated terminals cannot operate.

Therefore, according to the present invention, the NTE and the designated terminal can be provided, and all other ISDN terminals connected to the S interface can be restricted to the non-designated terminal.

Claims (1)

U interface with 2BIQ ECM (Echo Cnacellation Method) code, transformer for transmitting 2B + D signal in both directions to network through 2-wire line, 2-wire-4 wire hybrid, and U interface element (PEB2093) A network terminal equipment (NTE) having a device 31 and an S interface device 33 connected to an U interface element via an UOM device 31 and an IOM (ISDN Oriented Module) bus and connected to an S interface line ( 3); S interface part (PEB2085) 57 connected to the U interface 32 of the NTE 3, LAPD control part (PEB2085) 55 performing the ISDN layer 2 function, and AD / DA converter and voice call Modem (PEB2165) 56 to enable the, the keypad 53 for inputting the called number, etc., the liquid crystal display 52 for outputting the calling party number and billing information and the terminal status, and the terminal operating status monitoring An S-interface 5 having an RS-232C connection unit 54 capable of performing an RS-232C connection, and a processor unit (Intel87C252) 5 which performs general control over ISDN telephone function and performs ISDN layer 3 and call control functions; When the commercial power supply is normal, the AC power supply in the range of 80V to 260V is supplied to provide + 40V power for supplying power to the S interface through the AC / DC converter. It is always connected to the power supply to operate the NTE (3) at + 5V, and is connected to the network feeder 61 used as a power supply when the commercial power supply is abnormal, and the polarity in the event of a commercial power supply abnormality by connecting to the network feeder 61. IS feeder is connected to commercial feeder 62 and S feeder 64 for supplying reversed + 40V to non-designated terminal. And a feeding means (6) having a feeding switch (63) for operating in a power feeding when the commercial power supply is abnormal.