CN113472755B - PCM equipment supporting SIP access - Google Patents

PCM equipment supporting SIP access Download PDF

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Publication number
CN113472755B
CN113472755B CN202110675889.3A CN202110675889A CN113472755B CN 113472755 B CN113472755 B CN 113472755B CN 202110675889 A CN202110675889 A CN 202110675889A CN 113472755 B CN113472755 B CN 113472755B
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module
unit
power supply
telephone
network
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CN113472755A (en
Inventor
吴益伟
余清华
陈宣林
李统孝
郑晓
凌秋立
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Zhejiang Hengjie Communication Technology Co ltd
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Zhejiang Hengjie Communication Technology Co ltd
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L65/00—Network arrangements, protocols or services for supporting real-time applications in data packet communication
    • H04L65/1066—Session management
    • H04L65/1101—Session protocols
    • H04L65/1104—Session initiation protocol [SIP]
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M1/00—Details of apparatus for conversion
    • H02M1/36—Means for starting or stopping converters
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B14/00—Transmission systems not characterised by the medium used for transmission
    • H04B14/02—Transmission systems not characterised by the medium used for transmission characterised by the use of pulse modulation
    • H04B14/04—Transmission systems not characterised by the medium used for transmission characterised by the use of pulse modulation using pulse code modulation
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L63/00—Network architectures or network communication protocols for network security
    • H04L63/02—Network architectures or network communication protocols for network security for separating internal from external traffic, e.g. firewalls
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L63/00—Network architectures or network communication protocols for network security
    • H04L63/14—Network architectures or network communication protocols for network security for detecting or protecting against malicious traffic
    • H04L63/1441—Countermeasures against malicious traffic
    • H04L63/145—Countermeasures against malicious traffic the attack involving the propagation of malware through the network, e.g. viruses, trojans or worms
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L69/00—Network arrangements, protocols or services independent of the application payload and not provided for in the other groups of this subclass
    • H04L69/18—Multiprotocol handlers, e.g. single devices capable of handling multiple protocols
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02D—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE
    • Y02D30/00—Reducing energy consumption in communication networks
    • Y02D30/70—Reducing energy consumption in communication networks in wireless communication networks

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  • Engineering & Computer Science (AREA)
  • Computer Security & Cryptography (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Computer Hardware Design (AREA)
  • General Engineering & Computer Science (AREA)
  • Computing Systems (AREA)
  • Multimedia (AREA)
  • General Health & Medical Sciences (AREA)
  • Virology (AREA)
  • Health & Medical Sciences (AREA)
  • Business, Economics & Management (AREA)
  • General Business, Economics & Management (AREA)
  • Power Engineering (AREA)
  • Telephonic Communication Services (AREA)

Abstract

The invention requests to protect PCM equipment supporting SIP access, which comprises a network telephone unit, an external exchange unit and a power supply unit. The external switching unit is connected to the network telephone unit for converting the analog signal into a digital signal and transmitting the digital signal through the IP network. The power supply unit comprises a voltage generation module and a power supply slow start module, the power supply slow start module is connected to the voltage generation module and the network telephone unit, and the voltage generation module is respectively connected to the network telephone unit and the external exchange unit. To sum up, the technical scheme has the following beneficial effects: the PCM equipment is low in power consumption and high in integration level, a power supply slow start module adopts a communication power supply with smaller ripples and higher quality, protection such as surge and power line tower overlapping is supported, output is stable, and the PCM equipment has carrier-grade reliability; the network telephone unit and the external exchange unit of the device have firewall functions, so that various network virus attacks can be effectively prevented, and the data security is improved.

Description

PCM equipment supporting SIP access
Technical Field
The present invention relates to an encoding apparatus, and more particularly, to a PCM apparatus supporting SIP access.
Background
The PCM equipment is used for pulse code modulation of various communication modes and is suitable for telephone sets, the PCM equipment is widely used in troops, public security and banks, the provided communication service function is very powerful, and the universal places have very high requirements on the stability of communication, so that the PCM equipment is particularly suitable for users who have high requirements on data transmission rate and need higher bandwidth. The power supply circuit part of the traditional PCM equipment uses more components and parts, the circuit structure is complex, the hardware cost is higher, and the maintenance is inconvenient. In addition, the power supply circuit part of the traditional PCM equipment lacks a corresponding circuit protection function, so that the safety and reliability of the circuit are poor, the communication effect is unstable, and the communication quality is caused to be problematic.
Disclosure of Invention
Aiming at the defects in the prior art, on one hand, the PCM equipment supporting the SIP access is provided, and has better safety and reliability.
In order to achieve the above object, on one hand, the following technical solutions are provided:
a PCM device supporting SIP access includes a network telephone unit, an external switching unit and a power supply unit.
The network telephone unit is used for connecting a telephone and receiving analog signals.
The external exchange unit is connected to the network telephone unit and is used for converting the analog signal received by the network telephone unit into a digital signal and transmitting the digital signal through an IP network.
The power supply unit comprises a voltage generation module and a power supply slow start module, the power supply slow start module is connected to the voltage generation module and the network telephone unit, the voltage generation module is respectively connected to the network telephone unit and the external exchange unit, the power supply slow start module is connected to the power supply input interface and is started in a delayed mode on a power supply inlet wire, a device on the protection device is achieved, and the voltage generation module is used for generating working voltage.
To sum up, the technical scheme has the following beneficial effects: the PCM equipment is low in power consumption and high in integration level, a power supply slow start module adopts a communication power supply with smaller ripples and higher quality, protection such as surge and power line tower overlapping is supported, output is stable, and the PCM equipment has carrier-grade reliability; the network telephone unit and the external exchange unit of the equipment are provided with firewall functions, so that various network virus attacks can be effectively prevented, and the safety of data is improved.
Drawings
Fig. 1 is a schematic block diagram of a PCM device supporting SIP access;
FIG. 2 is a schematic circuit diagram of a power supply slow-start module of a PCM device supporting SIP access;
FIG. 3 is a schematic circuit diagram of a telephone user interface module of a PCM device supporting SIP access;
fig. 4 is a circuit schematic diagram of a telephone interface power module of a PCM device supporting SIP access.
Reference numerals are as follows: 10. a network telephone unit; 11. a first FPGA; 12. a telephone user interface module; 13. a telephone interface power module; 14. a signal switching module; 15. a telephone interface protection module; 16. a drive module; 17. an indicator light module; 20. an external exchange unit; 21. a second FPGA; 22. a VOIP control module; 23. a USB interface module; 24. an Ethernet RJ45 interface module; 25. an MCU module; 30. a power supply unit; 31. a voltage generation module; 32. and a power supply slow start module.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings and examples. In which like parts are designated by like reference numerals. It should be noted that the terms "front," "back," "left," "right," "upper" and "lower" used in the following description refer to directions in the drawings, and the terms "bottom" and "top," "inner" and "outer" refer to directions toward and away from, respectively, the geometric center of a particular component.
As shown in fig. 1, a PCM device supporting SIP access includes a network phone unit 10, an external switching unit 20, and a power supply unit 30; the network telephone unit 10 is used for connecting a telephone and receiving analog signals; the external switching unit 20 is connected to the network telephone unit 10, and is configured to convert an analog signal received by the network telephone unit 10 into a digital signal and transmit the digital signal through an IP network; the power supply unit 30 includes a voltage generation module 31 and a power supply slow start module 32, the power supply slow start module 32 is connected to the voltage generation module 31 and the network telephone unit 10, the voltage generation module 31 is respectively connected to the network telephone unit 10 and the external exchange unit 20, the power supply slow start module 32 is used for being connected to a power supply input interface, the power supply input line is delayed to be started, the device on the equipment is protected, and the voltage generation module 31 is used for generating working voltage. The PCM equipment is low in power consumption and high in integration level, the power supply slow start module 32 adopts a communication power supply with smaller ripples and higher quality, protection such as surge and power line tower overlapping is supported, output is stable, and the PCM equipment has carrier-grade reliability; the network telephone unit 10 and the external exchange unit 20 of the device have firewall functions, can effectively prevent various network virus attacks, and improve the safety of data.
As shown in fig. 2, the power supply slow start module 32 includes a field effect transistor U2, a drain of the field effect transistor U2 is connected to a VCC power supply terminal, a gate of the field effect transistor U2 is connected to a source thereof through a resistor R24, the gate of the field effect transistor U2 is further connected to a collector of a transistor Q3 through a resistor R25, a base of the transistor Q3 is connected to an anode of a diode D3, a cathode of the diode D3 is connected to an anode of an electrolytic capacitor EC3, a cathode of the electrolytic capacitor EC3 and an emitter of the transistor Q3 are commonly grounded, a cathode of the diode D3 is further connected to one end of a resistor R18 and one end of a resistor R22, the other end of the resistor R22 is connected to an emitter of a transistor Q5, a base of the transistor Q5 is respectively connected to the other end of the resistor R18 and one end of the resistor R23, a collector of the transistor Q5 and the other end of the resistor R23 are commonly grounded, a base of the transistor Q5 is further connected to a source of the field effect transistor U2, an anode of the electrolytic capacitor EC5 and a cathode of the diode D2 are commonly grounded; the network telephone unit 10 is connected to the base of the triode Q5 for receiving +5V voltage, and the voltage generating module 31 is connected to the base of the triode Q5 for converting the +5V voltage into 2.5V voltage and 3.3V voltage.
The network telephone unit 10 comprises a first FPGA11, a telephone user interface module 12, a telephone interface power module 13, a signal switching module 14 and a driving module 16; the first FPGA11 is connected to the external switching unit 20, the voltage generation module 31, the telephone user interface module 12 and the driving module 16, respectively; the phone user interface module 12 is connected to the voltage generation module 31, the phone interface power module 13 and the signal switching module 14, respectively, and the phone user interface module 12 is used for calling and detecting a phone line state.
As shown in fig. 3, the phone user interface module 12 includes a phone user interface chip 6U1, an RTV1 pin of the phone user interface chip 6U1 is connected to one end of a resistor 6R20, an RSN1 pin is connected to the other end of the resistor 6R20, an IHL1 pin is connected to one end of a capacitor 6C20, an IHL2 pin is connected to one end of a capacitor 6C45, a VREF pin, the other end of the capacitor 6C20 and the other end of the capacitor 6C45 are commonly connected to one end of a capacitor 6C21, the other end of the capacitor 6C21 is grounded, an LFC1 pin and an LFC2 pin are respectively connected to one end of a capacitor 6C44 and one end of a capacitor 6C18, the other end of the capacitor 6C44 and the other end of the capacitor 6C18 are commonly grounded, an RTV2 pin and an RSN2 pin are connected through a resistor 6R2, an IREF pin is grounded through a resistor 6R33, a DVDD pin and an AVDD pin are commonly connected to the voltage generating module 31; the TIPD1 pin of telephone user interface chip 6U1 is connected to K2 pin of overvoltage protector 6U5 and one end of thermistor 6RT3, the other end of thermistor 6RT3 is connected to signal switching module 14, RINGD1 pin of telephone user interface chip 6U1 is connected to K1 pin of overvoltage protector 6U5 and one end of thermistor 6RT4, the other end of thermistor 6RT4 is connected to signal switching module 14, G pin of overvoltage protector 6U5 is connected to telephone interface power supply module 13, A pin of overvoltage protector 6U5 is connected with K2 pin through capacitor 6C3, A pin of overvoltage protector 6U5 is also connected with K1 pin through capacitor 6C4, A pin of overvoltage protector 6U5 is also grounded, TDC1 pin of telephone user interface chip 6U1 is connected with TIPD1 pin through resistor 6R6 and resistor 6R5, TAC1 pin of telephone user interface chip 6U1 is connected with TIPD1 pin through capacitor 6C31 and 6R30, RAC1 pin of telephone user interface chip 6U1 is connected to RINGD1 pin of telephone user interface chip 6U1 through capacitor 6C31 and resistor 6R30, RAC 6R6 pin 29 and RINGD 6R6 pin are connected to RINGD1 pin of telephone user interface chip 6U 6, and RINGD 6R 6; the TIPD2 pin of telephone user interface chip 6U1 is connected to the K2 pin of overvoltage protector 6U4 and one end of thermistor 6RT1, the other end of thermistor 6RT1 is connected to signal switching module 14, the RINGD2 pin of telephone user interface chip 6U1 is connected to the K1 pin of overvoltage protector 6U4 and one end of thermistor 6RT2, the other end of thermistor 6RT2 is connected to signal switching module 14, the G pin of overvoltage protector 6U4 is connected to telephone interface power supply module 13, the a pin of overvoltage protector 6U4 is connected to the K2 pin through capacitor 6C2, the a pin of overvoltage protector 6U4 is also connected to the K1 pin through capacitor 6C1, the a pin of overvoltage protector 6U4 is also grounded, the TDC2 pin of telephone user interface chip 6U1 is connected to the TIPD2 pin through resistor 6R25 and resistor 6R24, the TAC2 pin of telephone user interface chip 6U1 is connected to the TIPD2 pin through capacitor 6C1 and resistor 6R27, the RAC2 pin of telephone user interface chip 6U1 is connected to the rdr 2 pin of telephone user interface chip 6U1 through capacitor 6C2 and resistor 6R26, and rdr 2 pin 23 are connected to the RDC 6R2 pin of telephone interface chip 23; the XB pin of the telephone user interface chip 6U1 is connected to a-48V power supply end through a resistor 6R32, the SWVSY pin is connected to the telephone interface power supply module 13 through a resistor 6R34, the SWVSZ pin is connected to the telephone interface power supply module 13 through a resistor 6R34, the VBH pin is connected to the anode of a diode 6D1, the cathode of the diode 6D1 is connected to the telephone interface power supply module 13, the VBH pin is also connected to the ground through an elevator 6C19 and a capacitor 6C41, the VBM1 pin and the VBM2 pin are connected to a-48V power supply, one end of a capacitor 6C47 and one end of a capacitor 6C42, the other end of the capacitor 6C47 and the other end of the capacitor 6C42 are connected to the ground, the VBL1 pin and the VBL2 pin are connected to the cathode of an electrolytic capacitor 6C56 and one end of the capacitor 6C46, the anode of the electrolytic capacitor 6C56 and the other end of the capacitor 6C46 are connected to the ground, and the ePAD pin is connected to the ground. The above connection mode ensures the safe and reliable operation of the equipment.
As shown in fig. 4, the phone interface power module 13 includes a transformer 6T1, and a first pin, a seventh pin, a ninth pin and a tenth pin of the transformer 6T1 are grounded; the second pin of the transformer 6T1 is connected to the cathode of the diode 6D6, the anode of the diode 6D6 is connected to the base of the triode 6Q1 through the resistor 6R8, and the second pin of the transformer 6T1 is also connected to a-48V power supply through the capacitor 6C7 and the resistor 6R35 of the resistor 6R36, respectively; a fourth pin of the transformer 6T1 is connected to an anode of a diode 6D4 through a resistor 6R7, a cathode of the diode 6D4 is connected to a gate of the field-effect tube 6U3 and a collector of the triode 6Q1, respectively, and the diode 6D4 is further connected in parallel with a capacitor 6C6; a fifth pin of the transformer 6T1 is connected to a drain electrode of the field effect tube 6U 3; the source electrode of the field effect tube 6U3 is connected to the base electrode of the triode 6Q1 through a capacitor 6C8, the capacitor 6C8 is connected with a resistor 6R12 in parallel, and the source electrode of the field effect tube 6U3 is also connected to a-48V power supply through a resistor 6R10 and a resistor 6R11 respectively; a sixth pin of the transformer 6T1 is connected to a cathode of the diode 6D8, an anode of the diode 6D8 is connected to the telephone user interface module 12, and an anode of the diode 6D8 is further grounded through a capacitor 6C9, a resistor 6R14, a capacitor 6C10, a capacitor 6C37, a capacitor 6C36 and a capacitor 6EC5, respectively; the eighth pin of the transformer 6T1 is connected to the cathode of the diode 6D9, the anode of the diode 6D9 is connected to the telephone user interface module 12, and the anode of the diode 6D9 is also grounded through the capacitor 6C12, the capacitor 6C11, and the resistor 6R13, respectively; the anode of the diode 6D9 is further connected to the anode of the diode 6D7 through a resistor 6R51, the cathode of the diode 6D7 is connected to the third pin of the optocoupler 60C1, the first pin of the optocoupler 60C1 is grounded, the sixth pin of the optocoupler 60C1 is connected to the cathode of the diode 6D5, the anode of the diode 6D5 is connected to a +48V power supply, and the fourth pin of the optocoupler 60C1 is connected to the base of the triode 6Q1 through a resistor 6R 37; the collector of transistor 6Q1 is connected to the cathode of diode 6D3 and one end of resistor 6R9, the other end of resistor 6R9 is connected to one end of capacitor 6C5 and ground, and the emitter of transistor 6Q1 is connected to the anode of diode 6D3, the other end of capacitor 6C5 and-48V power supply.
The telephone user interface chip 6U1 can access two pairs of telephone lines, and the telephone user interface chip 6U1 judges the state of each pair of telephone lines by combining the resistance and the capacitance on the internal dsp calculation line.
The telephone user interface modules 12 are provided in plurality, each telephone user interface module 12 is respectively connected with the voltage generation module 31, the first FPGA11 and the signal switching module 14, and the telephone interface power supply module 13 is provided in plurality and is connected with each telephone user interface module 12 in a one-to-one correspondence manner.
The network telephony unit 10 further comprises a telephony interface protection module 15 connected to the signal switching module 14 for protecting the telephony user interface module 12.
The network telephony unit 10 also includes an indicator light module 17 connected to the first FPGA11. The indicator light module 17 is used for displaying the current working state.
The external exchange unit 20 comprises a second FPGA21, a VOIP control module 22 and an MCU module 25, wherein the second FPGA21 is connected to the network telephone unit 10 and used for converting analog signals received by the network telephone unit 10 into digital signals and transmitting the digital signals through an IP network, the second FPGA21 is also connected to a voltage generation module 31, the VOIP control module 22 is connected to the second FPGA21 and used for processing sip protocols, and the MCU module 25 is connected to the second FPGA21 and used for collecting and controlling signals.
More specifically, the second FPGA21 is connected to the first FPGA11.
The external switching unit 20 also includes a USB interface module 23 connected to the VOIP control module 22. The external switching unit 20 also includes an ethernet RJ45 interface module 24 connected to the VOIP control module 22.
The Ethernet RJ45 interface module 24 is provided with a plurality of interfaces respectively connected to the VOIP control module 22, and the USB interface module 23 is provided with a plurality of interfaces respectively connected to the VOIP control module 22. The USB interface module 23 and the ethernet RJ45 interface module 24 are both provided with a plurality of options for users.
The above is only a preferred embodiment of the present invention, and the protection scope of the present invention is not limited to the above-mentioned embodiments, and all technical solutions belonging to the idea of the present invention belong to the protection scope of the present invention. It should be noted that modifications and embellishments within the scope of the invention may occur to those skilled in the art without departing from the principle of the invention, and are considered to be within the scope of the invention.

Claims (9)

1. A PCM device supporting SIP access, comprising a network telephone unit (10), an external switching unit (20) and a power supply unit (30);
the network telephone unit (10) is used for connecting a telephone and receiving analog signals;
the external exchange unit (20) is connected to the network telephone unit (10) and is used for converting the analog signals received by the network telephone unit (10) into digital signals and transmitting the digital signals through an IP network;
the power supply unit (30) comprises a voltage generation module (31) and a power supply slow start module (32), the power supply slow start module (32) is connected to the voltage generation module (31) and the network telephone unit (10), the voltage generation module (31) is respectively connected to the network telephone unit (10) and the external exchange unit (20), the power supply slow start module (32) is used for being connected to a power supply input interface, starting the power supply inlet wire in a delayed mode to protect devices on equipment, and the voltage generation module (31) is used for generating working voltage;
the power supply slow-start module (32) comprises a field effect tube U2, the drain electrode of the field effect tube U2 is connected to a VCC power supply end, the grid electrode of the field effect tube U2 is connected to the source electrode of the field effect tube U2 through a resistor R24, the grid electrode of the field effect tube U2 is further connected to the collector electrode of a triode Q3 through a resistor R25, the base electrode of the triode Q3 is connected to the positive electrode of a diode D3, the negative electrode of the diode D3 is connected to the positive electrode of an electrolytic capacitor EC3, the negative electrode of the electrolytic capacitor EC3 and the emitter electrode of the triode Q3 are grounded together, the negative electrode of the diode D3 is further connected to one end of a resistor R18 and one end of a resistor R22 respectively, the other end of the resistor R22 is connected to the emitter electrode of a triode Q5, the base electrode of the triode Q5 is connected to the other end of a resistor R18 and one end of a resistor R23 respectively, the collector electrode of the triode Q5 and the other end of the resistor R23 are grounded together, the base electrode of the triode Q5 is further connected to the source electrode of the field effect tube U2, the positive electrode of the electrolytic capacitor EC 2 and the negative electrode of the diode D2 are grounded together; the network telephone unit (10) is connected to the base electrode of the triode Q5 and used for receiving +5V voltage, and the voltage generating module (31) is connected to the base electrode of the triode Q5 and used for converting the +5V voltage into 2.5V voltage and 3.3V voltage.
2. The PCM equipment supporting SIP access according to claim 1, wherein the network telephone unit (10) comprises a first FPGA (11), a telephone user interface module (12), a telephone interface power supply module (13), a signal switching module (14) and a driving module (16);
the first FPGA (11) is respectively connected to an external exchange unit (20), a voltage generation module (31), a telephone user interface module (12) and a drive module (16);
the telephone user interface module (12) is respectively connected to the voltage generation module (31), the telephone interface power supply module (13) and the signal switching module (14), and the telephone user interface module (12) is used for calling and detecting the state of a telephone line.
3. The PCM device supporting SIP access according to claim 2, wherein a plurality of the telephone user interface modules (12) are provided, each telephone user interface module (12) is respectively connected with the voltage generating module (31), the first FPGA (11) and the signal switching module (14), and the telephone interface power supply module (13) is provided in plurality and is connected with each telephone user interface module (12) in a one-to-one correspondence.
4. The SIP access enabled PCM device according to claim 3, wherein the network telephony unit (10) further comprises a telephony interface protection module (15) connected to the signal switching module (14) for protecting the telephony user interface module (12).
5. The SIP access enabled PCM device according to claim 4, wherein the network telephony unit (10) further comprises an indicator light module (17) connected to the first FPGA (11).
6. The SIP access-capable PCM device according to any one of claims 1-5, wherein the external switching unit (20) comprises a second FPGA (21), a VOIP control module (22) and an MCU module (25), the second FPGA (21) is connected to the network telephone unit (10) for converting analog signals received by the network telephone unit (10) into digital signals and transmitting the digital signals through an IP network, the second FPGA (21) is further connected to a voltage generation module (31), the VOIP control module (22) is connected to the second FPGA (21) for processing SIP protocols, and the MCU module (25) is connected to the second FPGA (21) for collecting and controlling signals.
7. The SIP access enabled PCM device according to claim 6, wherein the external switching unit (20) further comprises a USB interface module (23) connected to the VOIP control module (22).
8. The SIP access enabled PCM device of claim 7, wherein the external switching unit (20) further comprises an Ethernet RJ45 interface module (24) connected to the VOIP control module (22).
9. PCM equipment supporting SIP access according to claim 8, characterized in that the Ethernet RJ45 interface module (24) is provided with a plurality and connected to the VOIP control module (22) respectively.
CN202110675889.3A 2021-06-17 2021-06-17 PCM equipment supporting SIP access Active CN113472755B (en)

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KR100197898B1 (en) * 1996-11-30 1999-06-15 김영환 Voice telephone service in atm
CN201042060Y (en) * 2007-04-10 2008-03-26 华为技术有限公司 Wireless fixing terminal
CN102316229A (en) * 2010-07-07 2012-01-11 北京讯光科技发展有限责任公司 Inter-pulse code modulation (PCM) equipment telephone service interconnection device and method
CN101964711B (en) * 2010-09-20 2013-01-16 华为终端有限公司 Power supply circuit and power supply chip of data card, and data card
CN102752459B (en) * 2012-06-28 2014-09-03 哈尔滨工业大学 Cordless telephone switchboard for group

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