CN2699587Y

CN2699587Y - A party telephone transmission system having E1 circuit based protection

Info

Publication number: CN2699587Y
Application number: CN 200420006734
Authority: CN
Inventors: 李灵; 侯景元; 李军成
Original assignee: Fiberhome Telecommunication Technologies Co Ltd
Current assignee: Fiberhome Telecommunication Technologies Co Ltd
Priority date: 2004-03-12
Filing date: 2004-03-12
Publication date: 2005-05-11
Anticipated expiration: 2014-03-12

Abstract

The utility model discloses a party telephone transmission system having E1 circuit based protection, comprising an initial station, a plurality of intermediate stations and a tail station. The contiguous stations are connected by the E1 main using circuits, and the initial station and the tail station are connected by an E1 standby circuit to make all the stations form a ring circuit. The utility model offsets the disadvantage of that the transmission of the traditional acoustic frequency signal is the point-to-point transmission only, increases the net pipe control to the transmission system to make the transmission system can smartly realize the protection on the base of the E1 circuit, and realizes the transmission of the party telephone. The system of utility model is suitable for the use of the traffic departments of the railway, the underground, the high road, etc.

Description

A kind of party telephone transmission system that has based on the E1 circuit protection

Technical field

The utility model relates to a kind of party telephone transmission system, relates to a kind of party telephone transmission system that has based on No. 1 standard of european telecommunication (E1) circuit protection particularly.

Background technology

Traditional audio user loop transmission equipment can only satisfy two side's voice calls of common point-to-point.

In No. 703 file of the committee of International Telecommunications Union (ITUG.703) the time-division multiplexing (TDM) implementation method has been described, promptly the time is divided into isometric timeslice, usually represent with a frame, the length of one frame is 125 μ S, per 16 frames are formed a multi-frame, and each frame is divided into 32 time slots, is labeled as TS0 successively, TS1, TS2......TS31.Wherein TS0 is a synchronization slot, and TS16 is the signalling time slot, and other 30 is data slot.

Adopt above-mentioned time-division multiplexing (TDM) can realize remote speech channel transmission, its basic principle is exactly to be voice signal to be inserted in the time slot behind the data-signal through code conversion, and after transmission, decoding is reduced into original voice signal again.

A kind of transmission system by Digital Subscriber Loop transporting speech business was described among the disclosed Chinese patent application CN1408158 on April 2nd, 2003.This system is inserted into the voice data coding in the time slot, and after transmission, decoding is reduced into voice data again.The mandarin sound business transmission of the point-to-point that is merely able to provide is provided the defective of this system, and multi-party simultaneous talking can not be provided, and effective protection can not be provided when transmission equipment is out of order.

Therefore, need a kind ofly can transmit the conllinear voice service and have the transmission system of circuit protection function.

Summary of the invention

The purpose of this utility model provides a kind of party telephone transmission system that has based on the E1 circuit protection.

Of the present utility model a kind of have based on the party telephone transmission system of E1 circuit protection form by initial station, a plurality of intermediate station, tail station, connect with circuit by E1 master between adjacent each station, be connected by the E1 stand-by circuit at first stop with between the tail station, make all stations form loops; At first stop, intermediate station, tail station hardware configuration be identical, each station is made up of 2/4 line audio interface plate and control panel, wherein

2/4 line audio interface plate comprises:

Analog-to-digital converting module will be converted to the transistor-transistor logic circuit digital signal from the audio signal of party telephone machine, export to E1 time slot synthesis module;

The digital-to-analogue conversion module will be converted to audio signal output from the transistor-transistor logic circuit digital signal of E1 time slot synthesis module and give the party telephone machine;

E1 time slot synthesis module, the transistor-transistor logic circuit digital signal of self simulation/data-converting block is inserted in the E1 time slot in the future, and outputing to control panel through bus, the transistor-transistor logic circuit digital signal of always extracting in the E1 of control panel time slot simultaneously outputs to numeral;

Microprocessor is controlled E1 time slot synthesis module;

Control panel comprises:

Buffering drive circuit is given the crossed array module by the bus reception from the E1 slot transmission of 2/4 line audio interface plate, will give 2/4 line audio interface plate by bus transfer from the E1 time slot of intersection array module;

The crossed array module will will arrive buffering drive circuit from the E1 slot transmission of meeting phone module from buffering drive circuit E1 slot transmission to the meeting phone module;

The conference telephone module will become the E1 time slot of frame module to carry out being transferred to the crossed array module after the conference telephone stack from E1, will carry out from the E1 time slot of intersection array module being transferred to E1 one-tenth frame module after the conference telephone stack;

E1 becomes frame module, will form the E1 frame from the E1 time slot of meeting phone module, will resolve into the E1 time slot from the E1 frame of LIM;

LIM becomes frame module to be connected with E1, to circuit transmission/reception E1 signal;

Master controller becomes frame module, conference telephone module, crossed array module to control to E1, and is responsible for the control to service management and network management signals.

The utility model has remedied in traditional audio signal transmission can only point-to-point shortcoming, and transmission system has been increased webmaster control, enables to realize neatly the protection based on the E1 circuit, and realizes the party telephone transmission.System of the present utility model is particularly useful for traffic departments such as railway, subway, highway and uses.

Description of drawings

Fig. 1 is the party telephone transmission system general structure schematic diagram that has based on the E1 circuit protection of the present utility model;

Fig. 2 is 2/4 a line audio interface plate structural representation on each station in the utility model system;

Fig. 3 is the control panel structural representation on each station in the utility model system.

Embodiment

Explain operation principle of the present utility model and specific implementation in detail below in conjunction with accompanying drawing.

The utility model operation principle is as follows: in a station, by 2/4 line audio interface plate audio signal is carried out the A/D conversion, finish the conversion of audio signal to the TTL digital signal, again the TTL digital signal is inserted in the time slot of E1 mouth, and by control panel finish that time slot intersects, the stack of conference telephone voice, E1 framing function, deliver to the next stop by transmission line then; The next stop by the digital signal in the control panel extraction E1 frame slot, and is finished D/A by 2/4 line audio interface plate and is changed, and is reduced into analog signal.Like this, the party telephone machine on station can hear the sound of all other party telephone machines of respectively standing on the self loop.

Fig. 1 is the general structure schematic diagram of the utility model system.Party telephone transmission system based on the E1 circuit protection of the present utility model is made up of initial station, a N intermediate station, tail station, has only listed 3 stations in Fig. 1: to stand 1 be the initial station, to stand 2 are intermediate stations, to stand 3 are tail stations.Each station always has 2 E1 interfaces.Among Fig. 1,1 first E1 interface of standing links to each other with first E1 interface at station 2, constitute the main E1 circuit of using between station 1 and the station 2,2 second the E1 interface of standing links to each other with first E1 interface at station 3, constitute the main E1 circuit of using between station 2 and the station 3,1 second the E1 interface of standing links to each other with second E1 interface at station 3, constitutes standby E1 circuit.That is, standing 1 is connected with circuit by E1 master between 2 with the station, stand 2 to be connected with circuit by E1 master between 3 with standing, and stands 1 to be connected by the E1 stand-by circuit between 3 with standing.The protection of E1 circuit is to realize by software control.When the E1 of main usefulness circuit just often, the service route of party telephone is: stand and 1 arrive at a station 2 through main with the E1 circuit, stand and 2 pass through and mainly arrive at a station 3 with the E1 circuit.If stand 2 and main between 3 of standing break down with the E1 circuit, 2 the control panel of standing recognizes second E1 mouth alarm, just station 2 is become the initial station by original intermediate station, and Sa1, Sa2, Sa3, Sa4, everybody value of Sa5 are set to 1 in the frame head of first E1.Like this, standing 1, to receive from Sa1, Sa2, Sa3, Sa4, everybody value of Sa5 in 2 first E1 frame head of station be 1, stand on 1 after the control panel identification, and station 1 is become intermediate station by original initial station, connects station 1 simultaneously and the standby E1 circuit between 3 of standing.Therefore after the above-mentioned processing, the service route of party telephone changes, and arrives at a station 1 through main with the E1 circuit by station 2, and the standby E1 circuit of 1 process of stand arrives at a station 3, and standing 2 becomes at first stop, and standing 1 then becomes intermediate station.E1 transmission channel between each station can adopt PDH (Pseudo-synchronous Digital Hierarchy) equipment (PDH), synchronous digital hierarchy (SDH) equipment, spread spectrum radio modulating equipment, satellite communication device etc. to transmit.

Stand in based on each of the party telephone transmission system of E1 route protection as shown in Figure 1 and comprise control panel and 2/4 line audio interface plate on the hardware, control panel links to each other by bus ST-BUS with 2/4 line audio interface plate.

Fig. 2 is the structural representation of 2/4 line audio interface plate on each station, its operation principle is as follows: 2/4 line audio interface plate is mainly used to insert the voice of party telephone machine, carry out the A/D conversion at the sending direction voice through the audio frequency incoming line, analog signal is become digital signal, on the synthetic output line STo that is inserted into the STBUS bus of E1 time slot, be transferred to control panel again; On receive direction, by the D/A conversion, the voice signal that is reduced into simulation is sent into the party telephone machine from the digital signal on the incoming line STi of the STBUS bus of control panel.A/D modular converter among Fig. 2 and D/A modular converter can adopt the integrated circuit of model AM79Q021JC, and microprocessor can adopt the integrated circuit of model AT89C51.

Fig. 3 is the structural representation of control panel on each station, its operation principle is as follows: on sending direction, the output line Sto of 2/4 line audio interface plate is transferred on the 2SBI of control panel, become frame module, LIM to output on the E1 interface 2LO through crossed array module, the stack of conference telephone module, E1 again, pass to next station through transmission line; On receive direction, become frame module to become the NRZ sign indicating number from HDB3 sign indicating number via line interface module, the E1 of E1 interface 2LI input, output on the incoming line STi of 2/4 line audio interface plate through the stack of conference telephone module and crossed array module 2SBO again from control panel.It is the integrated circuit of MT8986 that crossed array module among Fig. 3 can adopt model, it is the integrated circuit of M34116B1 that the conference telephone module can adopt model, it is the integrated circuit of DS21554/2155 that E1 becomes frame module can adopt model, and it is the integrated circuit of MPC850 that master controller can adopt model.

Above specific embodiment only for explaining know-why of the present utility model, does not constitute the restriction to the utility model protection range.The utility model protection range is limited by incidental claims.

Claims

1. party telephone transmission system that has based on the E1 circuit protection, this system is made up of initial station, a plurality of intermediate station, tail station, is connected with circuit by E1 master between adjacent each station, is connected by the E1 stand-by circuit between initial station and the tail station, makes all station formation loops; At first stop, intermediate station, tail station hardware configuration be identical, each station is made up of 2/4 line audio interface plate and control panel, it is characterized in that:

2/4 line audio interface plate comprises

Microprocessor is controlled E1 time slot synthesis module;

Control panel comprises

2. according to the described system of claim 1, it is characterized in that: analog-to-digital converting module in the 2/4 line audio interface plate and numeral adopt the integrated circuit of model AM79Q021JC, and microprocessor adopts the integrated circuit of model AT89C51.

3. according to the described system of claim 1, it is characterized in that: it is the integrated circuit of MT8986 that the crossed array module in the control panel adopts model, it is the integrated circuit of M34116B1 that the conference telephone module adopts model, it is the integrated circuit of DS21554/2155 that E1 becomes frame module to adopt model, and it is the integrated circuit of MPC850 that master controller adopts model.