CN109040496B - Method and system for realizing cross-region transmission of analog signals - Google Patents
Method and system for realizing cross-region transmission of analog signals Download PDFInfo
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- CN109040496B CN109040496B CN201810784415.0A CN201810784415A CN109040496B CN 109040496 B CN109040496 B CN 109040496B CN 201810784415 A CN201810784415 A CN 201810784415A CN 109040496 B CN109040496 B CN 109040496B
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04M—TELEPHONIC COMMUNICATION
- H04M7/00—Arrangements for interconnection between switching centres
- H04M7/12—Arrangements for interconnection between switching centres for working between exchanges having different types of switching equipment, e.g. power-driven and step by step or decimal and non-decimal
- H04M7/1205—Arrangements for interconnection between switching centres for working between exchanges having different types of switching equipment, e.g. power-driven and step by step or decimal and non-decimal where the types of switching equipement comprises PSTN/ISDN equipment and switching equipment of networks other than PSTN/ISDN, e.g. Internet Protocol networks
- H04M7/1295—Details of dual tone multiple frequency signalling
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- 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
- H04L69/06—Notations for structuring of protocol data, e.g. abstract syntax notation one [ASN.1]
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- 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
- H04L69/22—Parsing or analysis of headers
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Abstract
A method for realizing cross-regional transmission of analog signals is used for enabling the cross-regional transmission of the analog signals between a relay terminal and a user terminal switching device, and comprises the following steps: step one, a relay end receives and detects a communication event control signal from a connected local end line system, and fills and transmits the communication event control signal to a user end switching device according to a self-defined first message rule; step two, the user end switching equipment analyzes the received self-defined rule message and makes a control instruction according to the communication event control signal in the message to make the user equipment connected with the user end switching equipment perform corresponding action; step three, after the user side switching equipment receives the event reporting analog signal of the user equipment, the event reporting analog signal is filled and transmitted to the relay side according to a self-defined second message rule; and step four, the relay terminal analyzes the received self-defined rule message and starts communication according to the event report analog signal in the message.
Description
Technical Field
The invention relates to the field of broadband and narrowband service access in a communication system, in particular to a method for realizing trans-regional transmission of user analog signals in the broadband and narrowband technology, belonging to the field of communication.
Background
With the increasing demand of users for telecommunication services, the provision of high-capacity, high-rate, high-quality integrated services (voice, data, video, multimedia, etc.) is becoming the direction of the development of access networks. MSAN integrated service access network, as an access layer product which can quickly realize broadband and narrowband integrated access and has smooth evolution capability, provides rich broadband and narrowband service interfaces, and comprises: POTS (V5), V.35, V.24, 2/4 line audio, VOIP, ADSL, VDSL, SHDSL, LAN, GEPON, etc. are suitable for business and residential buildings, large customers, etc. with various service requirements, and a one-stop full access technology is realized.
In an existing MSAN (Multi-service access Network, integrated service access Network) system, multiple types of broadband and narrowband services may exist integrally, which makes an operator tend to a networking scheme with downward service compatibility when applying the system. According to the national development planning and network laying conditions of various regions, the distribution and use areas of client fixed telephones managed by the same local server are very wide, and long-distance signal transmission often occurs, which is often occurred in regions with extensive people in western regions.
For historical and practical reasons, these office servers manage whether both the fixed line telephone and the customer premises are connected by analog telephone lines, so in a practical case there is a need for analog signal continuation and MSAN services to coexist. In view of the characteristics of analog signal transmission, the maximum transmission distance of an analog signal that most analog signal processing chips can support is usually not more than 10 km on the premise of ensuring the signal attenuation quality, that is, the conventional analog signal transmission spans the transmission distance of a conventional analog signal processing chip, which is referred to as "transregional" transmission of the analog signal in the industry, and obviously, the conventional processing equipment cannot meet the above engineering application requirements and must perform extended transmission of the analog signal.
For the requirement of transmitting such analog signals across cities or across equipment laying areas, in the prior art, schemes such as adding a trunk switch or an analog repeater (one type of trunk equipment) in cooperation with analog line growth are often used, as shown in fig. 8, in order to extend the analog signal length of a PBX (subscriber-level switch, usually, local-side equipment) from a range that can be covered by Site B equipment to Site a beyond the range, two trunk equipments must be externally connected and lines must be laid for the two trunk equipments, it is obvious that such schemes not only increase the number of local-side equipment and extend the length of analog telephone lines, but also newly added local-side trunk equipment and telephone analog lines cannot be compatible with services of an MSAN system.
Disclosure of Invention
The present invention is made to solve the above-mentioned problem that the simple addition of the office-side relay equipment and the extension of the analog telephone line can satisfy the requirement of cross-transmission but the investment is large, and the object of the present invention is to provide a method and a system for realizing cross-regional transmission of analog signals.
The invention provides a method for realizing trans-regional transmission of analog signals, which is used for trans-regional transmission of telephone analog signals on a digital signal network between a relay terminal and user terminal switching equipment, and is characterized in that: after the telephone analog signal is encapsulated into a digital signal, communication is started between the relay terminal and the user terminal switching equipment through a digital signal network for transmission.
The invention provides a method for realizing trans-regional transmission of analog signals, which specifically comprises the following steps:
the relay terminal fills the communication event control signal into a first message according to a self-defined first message rule, and transmits the first message to the user side switching equipment through the digital signal network;
the user terminal switching equipment analyzes the first message and correspondingly sends out a control signal according to the message to control the user equipment to respond to a communication event control signal in the first message;
the user end switching equipment fills the event reporting analog signal into a second message according to a self-defined second message rule, and transmits the second message to the relay end;
and the relay terminal analyzes and receives the second message and starts communication according to the event reporting analog signal in the second message.
The invention provides a method for realizing trans-regional transmission of analog signals, which is characterized in that the specific steps of starting communication comprise:
the DTMF signal sent by the user equipment is converted into a digital signal by the user side switching equipment;
the digital signals are packed into RTP stream and transmitted to the relay terminal;
the relay terminal unpacks after receiving the RTP stream;
and the relay terminal converts the PCM code stream obtained after unpacking into an analog signal and transmits the analog signal to the local terminal line system.
The invention provides a method for realizing trans-regional transmission of analog signals, which is characterized by comprising the following steps:
wherein the communication event control signal is transmitted from a local side line system,
the office line system includes a subscriber exchange,
the user equipment is a telephone set and is provided with a plurality of user equipment,
the communication event control signal is a ringing signal or an inverse analog signal,
and the event reporting analog signal is an off-hook signal.
The invention provides a method for realizing trans-regional transmission of analog signals, which is characterized by comprising the following steps:
wherein, the user exchanger and the telephone set in the local side line system are connected by analog telephone line,
the user end switching equipment and the user equipment are connected by an analog telephone line,
the user end switching equipment is connected with the relay end through an IP network or an MPLS network.
The method for realizing the trans-regional transmission of the analog signals is characterized in that a self-defined first message rule is as follows:
filling in the payload with a command ID indicates a ringing related message, and using the next two bytes to indicate ringing control: ringing and stopping ringing, using UDP message of said form to indicate ringing or stopping ringing event,
the customized second message rule is as follows:
the payload is filled with command ID to represent an off-hook or on-hook message, and the UDP message in the format represents that an off-hook or on-hook event exists.
The invention provides a method for realizing trans-regional transmission of analog signals, which is characterized by comprising the following steps:
the message content of the first message is loaded and sent to the user side switching equipment on the digital signal network, the user side switching equipment analyzes the fields of the corresponding positions of the messages after receiving the messages to judge event classification, and the user side switching equipment generates corresponding ringing and ring-stopping analog signals according to the event classification;
the message content of the second message is carried on the digital signal network and sent to the relay terminal, after receiving the message, the relay terminal analyzes the field of the corresponding position of the message to judge the event classification, and the relay terminal generates a corresponding high-low level change analog signal on the analog telephone line according to the event classification and informs the upstream equipment connected on the analog telephone line that an on-hook/off-hook occurs.
The invention provides a method for realizing trans-regional transmission of analog signals, which is characterized by comprising the following steps:
wherein, when starting communication, a corresponding TDM channel is established,
if the user equipment generates a flash signal, the flash signal is transmitted to an upstream analog line connected with the relay end through the TDM channel;
if the user equipment generates a pulse dialing signal, the pulse dialing signal is also transmitted to an upstream analog line connected with the relay terminal through the TDM channel;
if the upstream analog line of the relay end has a reverse polarity signal, the reverse polarity signal is also transmitted to the analog line connected with the user end switching equipment through the TDM channel until reaching the telephone connected with the user end switching equipment;
if the upstream analog line of the relay terminal has the caller identification signal, the caller identification signal can be transmitted to the analog line connected with the user terminal switching equipment through the TDM channel until the user terminal switching equipment displays the calling number.
The invention provides a method for realizing trans-regional transmission of analog signals, which is characterized by comprising the following steps:
wherein the relay terminal is an external switch used in the MSAN,
the user side switching equipment is an external switching station used in MSAN.
The invention also provides a transregional transmission system of analog signals, comprising:
the local side line system comprises a user switch;
the relay terminal is in communication connection with the private branch exchange through an analog telephone line;
the user side switching equipment is in communication connection with the relay side through a digital signal network;
at least one user device communicatively coupled to the user-side switching device via an analog telephone line,
wherein, when the analog signal transmission is carried out,
the relay terminal receives and detects a communication event control signal from a connected local terminal line system, and fills and transmits the communication event control signal to the user terminal switching equipment according to a self-defined first message rule;
the user side switching equipment analyzes the received user-defined rule message and makes a control instruction according to the communication event control signal in the message to make corresponding action on user equipment connected with the user side switching equipment;
after receiving the event reporting analog signal of the user equipment, the user side switching equipment fills and transmits the event reporting analog signal to the relay terminal according to a self-defined second message rule;
and the relay terminal analyzes the received self-defined rule message and starts communication according to the event report analog signal in the message.
The invention has the following functions and effects: according to the method for realizing the transregional transmission of the analog signals, the invention relates to the following processes: step one, the relay terminal receives and detects a communication event control signal from a connected local side line system, and fills and transmits the communication event control signal to the user side switching equipment according to a self-defined first message rule; step two, the user side switching equipment analyzes the received self-defined rule message and makes a control instruction according to the communication event control signal in the message to make the user equipment connected with the user side switching equipment perform corresponding action; step three, after the user side switching equipment receives the event reporting analog signal of the user equipment, the event reporting analog signal is filled and transmitted to the relay terminal according to a self-defined second message rule; and step four, the relay terminal analyzes the received self-defined rule message, and reports the analog signal according to the event in the message to start communication, the analog signal of the local side line system is filled according to the self-defined message rule through the relay terminal by introducing the relay terminal and the user side switching equipment, and then the obtained message is transmitted between the relay terminal and the user side switching equipment.
Correspondingly, the cross-regional analog signal transmission system provided by the invention introduces the switching equipment of the relay terminal and the user terminal, the equipment is the existing equipment in the existing MSAN network, the wide and narrow band service functions of the existing MSAN system can be compatible, the communication between the equipment and the user terminal can be carried out by depending on the existing network, namely, the problems of equipment overhead and network layout overhead in the analog telephone line cross-length distance transmission in the local side line system in the MSAN system can be solved without adding new network layout and line overhead, the cross-regional analog signal transmission system is suitable for the migration of cross-regional users, does not depend on complex standards, has strong designability and can be flexibly configured according to different conditions of customers.
In the design implementation of the transmission system, the used self-defined message rule can be used for payload filling based on the existing UDP message, is simple and easy to implement, can realize cross-region transmission of the circuit of the analog signal only by setting an internal protocol between the relay terminal and the user terminal switching equipment and correspondingly has the functions of providing digital-to-analog conversion and analog-to-digital conversion, and achieves the effect of prolonging the cross-region of the analog circuit in the existing scheme.
Drawings
FIG. 1 is a network diagram of an analog signal transregional delivery system in an embodiment of the invention;
FIG. 2 is a flowchart of a method for implementing cross-region transfer of analog signals according to an embodiment of the present invention;
fig. 3 is a process of initializing the switching device chips of the relay end and the subscriber end;
fig. 4 is a flow chart of implementing signal transmission from the relay to the user equipment;
fig. 5 shows a process of implementing signal transmission from the ue to the relay;
FIG. 6 is a signal pass-through flow;
FIG. 7 is a step of communication after TDM channel establishment;
fig. 8 is a schematic diagram of a scheme for cross-regional delivery using a line extension and relay device in the prior art.
Detailed Description
In order to make the technical means, the creation features, the achievement objectives and the efficacy of the present invention easy to understand, the following embodiments specifically describe the composition, the structure, the connection relationship, the flow and the steps of the analog signal transregional transmission system and the implementation method of the present invention with reference to the attached drawings.
Term of terminology
DTMF, Dual Tone Multi Frequency, consists of a high Frequency group and a low Frequency group, each of which contains 4 frequencies. A high frequency signal and a low frequency signal are superimposed to form a combined signal representing a number having a total of 16 codes for use in dialing in a telephone system.
TDM, Time division multiplexing.
PCM, Pulse Code Modulation.
IP, an abbreviation of internet protocol, means "protocol for interconnection between networks", and a network running the protocol is an IP network.
MPLS, Multi-Protocol Label Switching, i.e., multiprotocol Label Switching, and the network that operates this specification is an MPLS network.
UDP, short for user datagram Protocol, and the chinese name is user datagram Protocol.
FXO, Foreign Exchange Office, external switch.
FXS, Foreign Exchange Station.
PBX, Private Branch Exchange.
The present embodiment provides a method for implementing trans-regional transmission of analog signals, which is used for trans-regional transmission of telephone analog signals on a digital signal network between a relay terminal and a subscriber end switching device, and is characterized in that: after the telephone analog signal is encapsulated into a digital signal, communication is started between the relay terminal and the user terminal switching equipment through a digital signal network for transmission.
The analog signal may be television, radio, or telephone, etc. which are conventionally transmitted by analog lines.
The communication can be point-to-point telephone communication, and can also be transmission of cable television and broadcast signals.
In order to sufficiently explain the case of the present embodiment, a case of making a call using a point-to-point analog telephone signal to perform voice communication will be described below.
Fig. 1 is a network diagram of an analog signal transregional delivery system according to an embodiment of the present invention.
The analog signal transregional transmission system 100 comprises a local side line system 10, a trunk side 20, a subscriber side switching device 30 and at least one subscriber device 40.
The office line system 10 includes a private branch exchange PBX communicatively coupled to at least one telephone Site B.
And a trunk terminal 20 communicatively connected to the private branch exchange via an analog telephone line.
And the user side switching equipment 30 is in communication connection with the relay side through an IP network or an MPLS network.
And the user equipment 40 is in communication connection with the user end switching equipment through an analog telephone line.
In the present embodiment, as shown in fig. 1, the office line system 10 is a private branch exchange that connects a plurality of telephone sites B via analog telephone lines, which is also a traditional line network structure of analog telephones of a telecommunications company.
The relay terminal 20 uses an external switch MSAN with FXO GW used in MSAN, and such design is for implementing fusion with existing multiple broadband and narrowband services.
The customer premises switching device 30 uses the foreign exchange station MSAN with FXS GW used in MSAN. The relay terminal 20 and the subscriber terminal switching device 30 are connected through an existing IP network.
The user equipment 40 uses a telephone SiteA.
The following describes the procedure of the present transmission system in transmitting analog signals.
Fig. 2 is a flowchart of a method for implementing cross-region transfer of analog signals according to an embodiment of the present invention.
Fig. 3 is a process of initializing the switching device chips of the relay end and the subscriber end.
As shown in fig. 2, before communication, an initialization flow is first performed, and then steps S1, S2, S3, and S4 are performed.
As shown in fig. 3, the initialization process:
the relay end equipment and the user end switching equipment are powered on in the MSAN system, the CODEC chip is initialized, the analog-digital conversion module and the digital-analog conversion module are ensured to work normally, a 10ms timer can be started to poll and detect high and low level changes, and whether an on-hook and off-hook event occurs or not is judged according to different trigger conditions.
Initializing a DSP chip to ensure normal packing and unpacking functions; and initializing a message processing module to ensure that the control message and the report message can be processed normally.
The initialization process of the switching device 30 at the user side and the relay side 20 are basically the same, and the only difference is the difference in the function of CODEC chips, the former provides the FXO interface function, and the latter provides the FXS interface function, so there is a little difference in the configuration CODEC chip attribute.
Fig. 4 is a flow chart of implementing signal transmission from the relay to the switch device at the user end.
The process of transferring the communication event control signal from the relay terminal to the user terminal switching device is two steps:
step S1, the relay receives and detects a communication event control signal from the connected office line system, and fills and transmits the communication event control signal to the user side switching device according to the customized first message rule.
Step S2, the user-side switching device parses the received custom rule message, and makes a control instruction according to the communication event control signal in the message to make the user device connected to the user-side switching device perform a corresponding action.
Steps S1 and S2 are actually a process of feedback, in this embodiment, the communication event control signal is a ring signal or an inverse analog signal, the corresponding actions are ring or inverse, respectively, the analog signal is actually converted into a digital signal and transmitted between the relay and the user switch via the IP network, and the specific signal transmission process is shown in fig. 4.
As shown in fig. 4, when the MSAN system is powered on, the relay node 20 receives and detects a communication event control signal from the connected office line system 10, and then the relay node 20 starts a 10ms polling mechanism to read a value of a register indicating a ring state, and when the obtained value indicates a ring state or a non-ring state, the event reporting module of the relay node fills a field with a customized message rule, where the customized first message rule is as follows:
using a specific free port number such as 3011, an address of an internal communication source mac and a destination mac, filling a command ID such as 0x0005 in a payload to represent a ringing related message, and then using the next two bytes to represent ringing control, such as 0x01 to represent ringing, 0x00 to represent ringing stop, and using a UDP message in the format to represent a ringing or ringing stop event;
the message content is loaded and sent to the user end switching device 30 on the IP network, after the user end switching device 30 receives the message, the field of the corresponding position of the message is analyzed to determine the event classification, the user end switching device operates the CODEC chip to generate the corresponding analog signals of ringing and ring-off, etc. according to the event classification, the analog signals make the user device connected with the user end switching device 30 do the corresponding action: ringing and stopping ringing.
Fig. 5 is a flow chart of the implementation of the signal transmission from the switch device of the ue to the relay device.
The process of reporting the analog signal of the signal transmission event from the user side switching equipment to the relay side comprises two steps:
step S3, after receiving the event reporting analog signal of the user equipment 40, the user side switching device 30 fills and transmits the event reporting analog signal to the relay terminal 20 according to a customized message rule;
step S4, the relay terminal 20 parses the received custom rule message, and starts communication according to the event report analog signal in the message, so as to establish the TDM channel.
Steps S3 and S4 are actually a process of feedback back and forth, in this embodiment, the event reporting analog signal is an on-hook signal, the corresponding actions are respectively on-hook, the analog signal is actually converted into a digital signal and transmitted between the user side switching device and the relay side via the IP network, and a specific signal transmission process is shown in fig. 5.
The MSAN system is powered on, the customer premises switching device 30 receives the event reporting analog signal from the customer premises device 40, then the customer premises switching device 30 starts a 10ms polling mechanism to read the high and low level states of the ports, when it is obtained that the high and low level states change, the event reporting module of the customer premises switching device 30 performs field filling by using a customized second message rule, where the customized second message rule is as follows:
using a specific free port number such as 3011, an address of an internal communication source mac and a destination mac, filling a command ID such as 0x0001 or 0x0002 in a payload to represent an off-hook or on-hook message, and using a UDP message in the format to represent an off-hook or on-hook event;
the message content is loaded and sent to the relay terminal 20 on the IP network, after the relay terminal 20 receives the message, the field of the corresponding position of the message is analyzed to determine the event classification, and the relay terminal 20 operates the register of the CODEC chip according to the event classification to generate corresponding analog signals such as high and low level changes on the analog line, so as to inform the upstream equipment of the analog line that an on-hook/off-hook occurs.
Fig. 6 is a signal transparent transmission flow.
Fig. 7 is a step of communication after TDM channel establishment.
The process of starting communication, i.e. establishing TDM channels, i.e. signal transparent transmission in step four is shown in fig. 6:
electrifying, configuring the TDM parameters of CODEC and DSP by the user side exchange equipment, and configuring the TDM parameters of CODEC and DSP (Digital Signal Processing) by the relay terminal 20; the TDM channels of the two parties are simultaneously established after the switching device 30 of the user terminal and the relay terminal 20 are triggered by an event occurring at one party.
At this time, if there is a flash signal generated by the phone 40 connected to the user side switching device 30, the flash signal is transmitted to the upstream analog line connected to the relay terminal 20 through the TDM channel;
at this time, if there is a pulse dialing signal generated by the phone 40 connected to the circuit of the user side switching device 30, the pulse dialing signal is also transmitted to the upstream analog circuit connected to the relay terminal 20 through the TDM channel;
at this time, if the analog line on the upstream side of the relay node 20 has a reverse polarity signal, the reverse polarity signal is also transmitted to the analog line connected to the user end switching device 30 through the TDM channel until reaching the user end switching device phone 40;
at this time, if there is a caller id signal on the upstream analog line of the relay node 20, the caller id signal is also transmitted to the analog line connected to the subscriber station switching equipment through the TDM channel until the subscriber station switching equipment 40 displays the caller id.
After these steps, the preparation of the call is completed, and the following steps of describing the signal transmission by using the TDM channel include:
in step S4-1, the DTMF signal sent by the user equipment 40 is converted into a digital signal by the user side switching device 30, in this embodiment, the CODEC chip of the user side switching device completes the analog-to-digital conversion. DTMF, dual-tone multifrequency. CODEC chip, CODEC chip.
In step S4-2, the digital signal in step S4-1 is packaged into an RTP stream and transmitted to the relay node 20 through the IP network, and in this embodiment, the digital signal is packaged into an RTP stream by the DSP chip of the user side switching device. RTP, Real-time Transport Protocol.
In step S4-3, the relay node 20 unpacks the RTP stream after receiving the RTP stream, and in this embodiment, the DSP chip of the relay node 20 unpacks the RTP stream.
In step S4-4, the relay terminal 20 converts the PCM code stream obtained after unpacking into an analog signal and transmits the analog signal to the office line system 10, in this embodiment, the relay terminal CODEC chip performs digital-to-analog conversion on the PCM code stream.
Thus, the extension of the analog signal from the telephone set in the coverage area Site B of the office line system 10 to the Site a outside the coverage area is completed, and the trans-regional transmission of the analog signal across the coverage area of the office line system 10 is realized.
The embodiment has the following functions and effects: according to the implementation method of transregional transmission of analog signals in the embodiment, the following processes are performed: step one, the relay terminal receives and detects a communication event control signal from a connected local side line system, and fills and transmits the communication event control signal to the user side switching equipment according to a self-defined first message rule; step two, the user side switching equipment analyzes the received self-defined rule message and makes a control instruction according to the communication event control signal in the message to make the user equipment connected with the user side switching equipment perform corresponding action; step three, after the user side switching equipment receives the event reporting analog signal of the user equipment, the event reporting analog signal is filled and transmitted to the relay terminal according to a self-defined second message rule; and step four, the relay terminal analyzes the received self-defined rule message, and reports the analog signal according to the event in the message to start communication, the analog signal of the local side line system is filled according to the self-defined message rule through the relay terminal by introducing the relay terminal and the user side switching equipment, and then the obtained message is transmitted between the relay terminal and the user side switching equipment.
Furthermore, the self-defined first message rule and the second message rule designed in the analog signal continuous transmission mode provided by the invention are based on the existing UDP protocol, the payload content is specified, the prior art standard is not separated, the adaptability innovation is also carried out, the rule is simple and easy to implement, the problem of the continuous transmission of the analog signals of the subscriber line in the MSAN system can be solved only by adding a single relay terminal disk as the relay terminal on the basis of the existing laid line, and the operation and maintenance cost is greatly saved.
Furthermore, in this embodiment, since the relay terminal and the user side switching device are connected through the existing IP and MPLS networks, not only the cost of line routing can be saved, but also the method is completely compatible with the existing devices, thereby facilitating the modification of the existing old network and the actual implementation of the scheme.
Correspondingly, the analog signal cross-regional transmission system provided by the embodiment introduces the switching devices of the relay terminal and the user terminal, the devices are all existing devices in the existing MSAN network, can be compatible with the broadband and narrowband service functions of the existing MSAN system, and the communication between the two devices can be performed by depending on the existing network, that is, the problems of device overhead and network layout overhead in the analog telephone line cross-long distance transmission in the local side line system in the MSAN system can be solved without adding new network layout and line overhead.
In the design implementation of the transmission system, the used self-defined message rule can be used for payload filling based on the existing UDP message, is simple and easy to implement, can realize cross-region transmission of the circuit of the analog signal only by setting an internal protocol between the relay terminal and the user terminal switching equipment and correspondingly has the functions of providing digital-to-analog conversion and analog-to-digital conversion, and achieves the effect of prolonging the cross-region of the analog circuit in the existing scheme.
The above embodiments are preferred examples of the present invention, and are not intended to limit the scope of the present invention.
Claims (7)
1. A method for realizing trans-regional transmission of analog signals, which is used for trans-regional transmission of telephone analog signals on a digital signal network between a relay terminal and user terminal switching equipment, is characterized in that: after the telephone analog signal is encapsulated into a digital signal, communication is started between the relay terminal and the user terminal switching equipment through a digital signal network for transmission;
the relay terminal fills the communication event control signal into a first message according to a self-defined first message rule, and transmits the first message to the user side switching equipment through the digital signal network;
the user terminal switching equipment analyzes the first message and correspondingly sends out a control signal according to the message to control the user equipment to respond to a communication event control signal in the first message;
the user end switching equipment fills the event reporting analog signal into a second message according to a self-defined second message rule, and transmits the second message to the relay end;
the relay terminal analyzes and receives the second message and starts communication according to the event reporting analog signal in the second message;
wherein the relay terminal is an external switch used in the MSAN,
the user side switching equipment is an external switching station used in MSAN;
the self-defined first message rule is as follows:
filling in the payload with a command ID indicates a ringing related message, and using the next two bytes to indicate ringing control: ringing and stopping ringing, using UDP message of said form to indicate ringing or stopping ringing event,
the customized second message rule is as follows:
the payload is filled with command ID to represent an off-hook or on-hook message, and the UDP message in the format represents that an off-hook or on-hook event exists.
2. The method of claim 1, wherein the step of transferring the analog signal across the region comprises:
the specific steps of starting communication comprise:
the DTMF signal sent by the user equipment is converted into a digital signal by the user side switching equipment;
the digital signals are packed into RTP stream and transmitted to the relay terminal;
the relay terminal unpacks after receiving the RTP stream;
and the relay terminal converts the PCM code stream obtained after unpacking into an analog signal and transmits the analog signal to a local side line system.
3. The method of claim 1, wherein the step of transferring the analog signal across the region comprises:
wherein the communication event control signal is transmitted from a local side line system,
the office line system includes a subscriber exchange,
the user equipment is a telephone set and is provided with a plurality of user equipment,
the communication event control signal is a ringing signal or an inverse analog signal,
and the event reporting analog signal is an off-hook signal.
4. The method of claim 3, wherein the step of transferring the analog signal across the region comprises:
wherein, the user exchanger and the telephone set in the local side line system are connected by analog telephone line,
the user end switching equipment and the user equipment are connected by an analog telephone line,
the user end switching equipment is connected with the relay end through an IP network or an MPLS network.
5. The method of claim 1, wherein the step of transferring the analog signal across the region comprises:
the message content of the first message is loaded and sent to the user side switching equipment on the digital signal network, the user side switching equipment analyzes the fields of the corresponding positions of the messages after receiving the messages to judge event classification, and the user side switching equipment generates corresponding ringing and ring-stopping analog signals according to the event classification;
the message content of the second message is carried on the digital signal network and sent to the relay terminal, after receiving the message, the relay terminal analyzes the field of the corresponding position of the message to judge the event classification, and the relay terminal generates a corresponding high-low level change analog signal on the analog telephone line according to the event classification and informs the upstream equipment connected on the analog telephone line that an on-hook/off-hook occurs.
6. The method of claim 1, wherein the step of transferring the analog signal across the region comprises:
wherein, when starting communication, a corresponding TDM channel is established,
if the user equipment generates a flash signal, the flash signal is transmitted to an upstream analog line connected with the relay end through the TDM channel;
if the user equipment generates a pulse dialing signal, the pulse dialing signal is also transmitted to an upstream analog line connected with the relay terminal through the TDM channel;
if the upstream analog line of the relay end has a reverse polarity signal, the reverse polarity signal is also transmitted to the analog line connected with the user end switching equipment through the TDM channel until reaching the telephone connected with the user end switching equipment;
if the upstream analog line of the relay terminal has the caller identification signal, the caller identification signal can be transmitted to the analog line connected with the user terminal switching equipment through the TDM channel until the user terminal switching equipment displays the calling number.
7. An analog signal transregional transmission system based on the implementation method of the analog signal transregional transmission of claim 1, comprising:
the local side line system comprises a user switch;
the relay terminal is in communication connection with the private branch exchange through an analog telephone line;
the user side switching equipment is in communication connection with the relay side through a digital signal network;
at least one user device communicatively coupled to the user-side switching device via an analog telephone line,
wherein, when the analog signal transmission is carried out,
the relay terminal receives and detects a communication event control signal from a connected local terminal line system, and fills and transmits the communication event control signal to the user terminal switching equipment according to a self-defined first message rule;
the user side switching equipment analyzes the received user-defined rule message and makes a control instruction according to the communication event control signal in the message to make corresponding action on user equipment connected with the user side switching equipment;
after receiving the event reporting analog signal of the user equipment, the user side switching equipment fills and transmits the event reporting analog signal to the relay terminal according to a self-defined second message rule;
the relay terminal analyzes the received self-defined rule message and starts communication according to the event report analog signal in the message;
the self-defined first message rule is as follows:
filling in the payload with a command ID indicates a ringing related message, and using the next two bytes to indicate ringing control: ringing and stopping ringing, using UDP message of said form to indicate ringing or stopping ringing event,
the customized second message rule is as follows:
the payload is filled with command ID to represent an off-hook or on-hook message, and the UDP message in the format represents that an off-hook or on-hook event exists.
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