CN1031775C - Digital user loop central machine system - Google Patents
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- CN1031775C CN1031775C CN 93108699 CN93108699A CN1031775C CN 1031775 C CN1031775 C CN 1031775C CN 93108699 CN93108699 CN 93108699 CN 93108699 A CN93108699 A CN 93108699A CN 1031775 C CN1031775 C CN 1031775C
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Abstract
The present invention relates to a concentrator system of a subscriber loop, which is designed to expand the capacity of a telephone by fully utilizing the existing junction line so as to be superior to the performance of a subscriber exchange. The concentrator system comprises a central office terminal (COT), a remote terminal (RT) and a common subscriber cable, wherein the COT is composed of a local call subscriber interface, a concentrated network, a digital time division multiplexing interface, a digital network interface and a CPU, and the RT is composed of a remote subscriber interface, a concentrated internal conversion interface, a digital time division multiplexing interface, a digital network interface and a CPU; the common subscriber cable is arranged between the COT and the RT. The RT has an internal conversion function, and the call between the RT and a telephone subscriber can also be timed and accounted by a telephone office. In serial products, eight users can be added by a pair of transmission lines, and the present invention has the advantages of high concentration ratio, great telephone traffic and low lost call rate.
Description
The present invention relates to a kind of is the network system of feature with the function of exchange, relates to a kind of-Digital Subscriber Loop concentrator system or rather.
Usually every telephone set will be connected with telephone office by a pair of subscribers feeder, statistics shows that the telecommunication line investment cost accounts for the 40%-70% of telecommunications gross investment, therefore and the utilance of subscriber's line only is 7%-14%, and saving track investment, improving line efficiency is a big problem in the communication.
Utilizing the local loop concentrator is a kind of effective way that solves the scarce line of the number of having, reduces the line construction expense.
Local loop concentrator system is made up of central office terminal, remote termination and transmission line thereof.Central office terminal is installed in the telephone office and is connected with telephone exchange, and remote termination is installed in away from telephone office but had not only concentrated but also near place from the user, is connected with some telephone subscribers, between two terminals by the subscribers feeder connection of negligible amounts.
Representative product has two kinds in the interior local loop concentrator of communications field scope at present, and a kind of is U.S. AT﹠amp; The SLC120 type Digital Subscriber Loop concentrator (DSLC) that T company produces, its central office terminal comprises the user interface that is connected with local exchange, digital time-division multiplex circuit, the optical transceiver that is connected with transmission line and to above-mentioned three CPU that functional part is controlled; Its remote termination comprises the optical transceiver that is connected with transmission line, digital time-division multiplex circuit, the user interface that is connected with the telephone subscriber, and to above-mentioned three CPU that functional part is controlled.Its transmission line can be with optical cable or domestic consumer's cable, but uses optical cable that cost is improved, and when using domestic consumer's cable per 1.6 kilometers to set up a regenerative repeater.Another kind of product is the HP16 type subscriber's line concentrator that Changchun telephone plant factory of the Ministry of Posts and Telecommunications produces, its central office terminal comprises the user interface that is connected with local exchange, on-line file, the trunk interface that is connected with transmission line and to above-mentioned three CPU that functional part is controlled, and its remote termination comprises the trunk interface that is connected with transmission line, on-line file, the user interface that is connected with the telephone subscriber and to above-mentioned three CPU that functional part is controlled.Owing to do not have digital time-division multiplex technique, digital network interface (DNIC) and interior calling function, can only be applicable to the occasion of low telephone traffic.
The objective of the invention is to design a kind of Digital Subscriber Loop concentrator system, the telephone subscriber who is connected in the system is the same with other telephone subscribers outside the system to use the item that waits that telephone office provides, and its incoming call is the same with other ordinary telephone subscribers with exhalation, dialling once certain waits item to get final product, incoming call in the system between each telephone subscriber is breathed out and can directly be chargeed by Local Exchange, average a pair of relay ring route 8 telephone subscribers that can increase in the system have the high technical characterstic of concentrating than, the Bulk Call and the low percent of call lost.
Digital Subscriber Loop concentrator of the present invention system, constitute by central office terminal, relay ring route, remote termination, central office terminal comprises the local user's interface that is connected with local exchange, the digital junction network interface that is connected with trunk, electron exchange matrix between two interfaces and CPU control assembly, remote termination comprises the digital junction network interface that is connected with the relay ring route, the remote subscriber interface that is connected with the telephone subscriber, electron exchange matrix between two interfaces and CPU control assembly thereof is characterized in that:
1) the electron exchange matrix of described central office terminal is made of existing matrixing network that function of exchange is arranged again and the digital multi-channel time division multiplex system with compression coding and decoding function concentrated;
2) the electron exchange matrix of described remote termination is made of existing matrixing network that the inner exchanging function is arranged again and the digital multi-channel time division multiplex system with compression coding and decoding function concentrated;
3) described digital junction network interface is made up of high speed, wideband data transmission system that the analog and digital signal processing combines;
4) described relay ring route is common not loading service cable, and every pair of subscribers feeder contains several digital voice channel and a high speed common data signaling channel.
This high speed common data channels between central office terminal and remote termination, mode with full duplex transmits various signalings mutually, several digital voice channels that digital multiplexing and digital network interface constituted between two terminals are distributed to each user in the demand assigned mode and are used, remote termination has the inner exchanging function, and guarantees the real-time timing of telephone office, charging.
Digital Subscriber Loop concentrator of the present invention system, when the remote termination telephone subscriber does caller, the following key step of its signal flow and handshaking procedure:
The remote termination user interface detects user's off hook signal, far-end CPU notifies local side CPU by the digital signalling channel with this user's off-hook information, local side CPU distributes to the digital voice channel of its free time, and with the corresponding local side of this user registered permanent residence off-hook, simultaneously, to distribute to this user's digital signalling channel by the digital signalling channel and inform far-end CPU, far-end CPU is routed to the digital voice channel of respective free with this user through concentrating switching network, the calling subscriber hears dialing tone immediately, the calling subscriber begins dialing, far-end CPU collects the digits, and IMU is crossed signaling channel notice local side called number that CPU dials, local side CPU transfers to corresponding called number at this with the registered permanent residence, whether discern the called subscriber simultaneously is some users of this concentrator internal system, called subscriber's off-hook, if be judged to when being some user of this concentrator inside, to notify far-end CPU, far-end CPU will lead, the called subscriber continues in the mode of inner exchanging, and the digital voice channel between release central office terminal and remote termination, local side CPU is with the master of central office terminal, the called subscriber is set to busy condition, until the master, Called Onhook.If during the local side CPU identification called subscriber user that be concentrator outer, calling and called are conversed routinely, conversation is finished, and The Calling Party Hooks On, far-end CPU notice local side CPU, and local side should use registered permanent residence on-hook, and the digital voice channel of distributing to it discharges, and other is for other user's use.
The feature of above-mentioned signal flow and handshaking procedure can further be expressed as:
1) the remote termination user interface detects user's off hook signal, far-end CPU is connected this user with the digital voice channel of a free time, and by the common data signaling channel with called number, calling subscriber number and the shared digital voice channel notification CPU of central office terminal of this user;
2) CPU of central office terminal connects the digital voice channel of correspondence, and identification called subscriber number when being judged to some user number of concentrator system, notifies remote termination CPU by the common data signaling channel with identifying information;
3) remote termination CPU receives this information, caller and called users is continued in the inner exchanging mode, and the digital voice channel between release central office terminal and remote termination, the notice CPU of central office terminal;
4) CPU of central office terminal the caller and called users mouth is set to busy, until The Calling Party Hooks On;
5) CPU of central office terminal is 1) the digital voice channel of correspondence is connected after the step, when the identification called subscriber number is judged to user number outside the concentrator system, the notice central office terminal's corresponding calling subscriber's mouth off-hook and the called number of transfering, behind called subscriber's off-hook, the calling and called conversation, until The Calling Party Hooks On, local side CPU makes corresponding local side, and this uses registered permanent residence on-hook, discharges the digital voice channel that is distributed.
The remote termination telephone subscriber does when called, its signal flow and handshaking procedure are to adopt following key step: the CPU of central office terminal detects bell signal from local side is a certain with the registered permanent residence, a digital voice channel is offered this user, and by common data channels notice remote termination CPU, remote termination CPU sends out bell signal to relative users, connect the corresponding digital voice channel simultaneously, called off-hook conversation discharges the corresponding digital voice channel until The Calling Party Hooks On.
Further specify technology of the present invention below in conjunction with accompanying drawing
Fig. 1 .HP16 type subscriber concentrator block diagram of system
Fig. 2 .SLC-120 Digital Subscriber Loop concentrator block diagram of system
Fig. 3. Digital Subscriber Loop concentrator of the present invention system forms frame principle figure
Fig. 4. digital network interface DNIC internal structure frame principle figure among Fig. 3
Referring to Fig. 1, the HP16 type subscriber concentrator central office terminal 100 that domestic Changchun telephone plant factory produces comprises local user's interface 101, on-line file 102, trunk interface 103 and CPU104, and local user's interface 101 is connected with local exchange by A, B line.
Remote termination 200 comprises trunk interface 201, on-line file 202, user interface 203 and CPU204, two ends intermachine trunk 300.Addressed before the subject matter of its existence and repeated no more.
Referring to Fig. 2, U.S. AT﹠amp; The SLC-120 type Digital Subscriber Loop concentrator system that T company produces, central office terminal 400 comprises local user's interface 401, digital time-division multiplex circuit 402, optical transceiver 403 and CPU404.
Referring to Fig. 3, central office terminal 700 controls 705 5 partial function parts formation by local user's interface 701, the existing matrixing network 702 that exchange is arranged again, time division multiplexed multiplex circuit 703, digital network interface DNIC (M) 704 and the CPU with compression coding and decoding function such as ADPCM of concentrating.
Local user's interface 701 of central office terminal 700 is connected with the A of local exchange, B line, and 800 of central office terminal 700 and remote terminations are connected by domestic consumer's cable 900.
The characteristics of above-mentioned Digital Subscriber Loop concentrator be have that digital time-division is multiplexing, digital network interface and remote termination have the inner exchanging function.Central office terminal can be connected with various types of service cables with digital network interface circuit between remote termination, the data-signal of full duplex ground transmission 160kbps and above speed thereof, and remote termination 800 has the inner exchanging function.
A high speed public number signaling channel is arranged between central office terminal and remote termination, transmit various signalings mutually, as control signaling, test signaling and failure diagnosis signaling etc. with full duplex mode.Digital signalling adopts frame synchronization structure, central office terminal is main synchronization frame, remote termination is from synchronization frame, every frame length is 128bits or its integral multiple, main synchronous digital signaling claims descending digital signalling again, deserve to be called line number word signaling again from the synchronous digital signaling, on, descending digital signalling is distinguished with different coding in frame structure, wherein main digital signalling is: certain user plucks/on-hook signaling, the dialed number signaling, dialing Bi Xinling, call out certain subscriber signaling, certain way word voice channel signaling that continues, certain the other side's on-hook signaling, certain fault signaling, tear certain way word voice channel signaling open, test certain signaling, in exhale certain signaling, specific function signaling etc.
Embodiment represents an information with 8 bit, and wherein 4bit error correction, 4bit are signaling, and in the 4bit signaling, 0-9 representative is dialled the number, and all the other A-F represent various information as plucking/on-hook, dial impulse, inner exchanging, ring etc. respectively.
The digital multiplex voice channel is all users' the public voice or the channel of data, is to distribute to each user with the principle of distribution according to need mode to use.Remote termination has the inner exchanging function, and can guarantee the real-time timing of telephone office, charging simultaneously.
When some users of remote termination are the caller off-hook, its signaling process and handshaking procedure are as follows: when the remote termination user interface detects this user's off-hook immediately, the CPU of remote termination is by the CPU of public number signaling channel with this user's off-hook information notice central office terminal, the CPU of central office terminal distributes the digital voice channel of a free time to it, with the corresponding local side user interface of this user off-hook, the digital voice channel that to distribute to this user by the public number signaling channel is informed the CPU of remote termination simultaneously, the CPU of remote termination is routed to corresponding idle digital voice channel with this user through concentrating switching network, the calling subscriber hears dialing tone immediately, the calling subscriber begins dialing, remote termination CPU collects the digits, and IMU is crossed the CPU that the digital signalling channel is notified the called number of being dialled central office terminal.
The CPU of central office terminal is when this transfers to corresponding called number with the registered permanent residence, the identification called number judges whether into the some telephone subscribers of Digital Subscriber Loop concentrator internal system, if external call, at this moment called subscriber's off-hook, calling and called can be conversed, and conversation is finished, and The Calling Party Hooks On, this on-hook information is by the public number signaling channel notice CPU of central office terminal, the CPU of central office terminal should use registered permanent residence on-hook, discharged the digital voice channel of distributing to it, so that use with the registered permanent residence for other.
When the CPU of central office terminal discerns this called number, be judged to when being the intrasystem telephone subscriber of Digital Subscriber Loop concentrator, when continuing of aforementioned calling and called finished by local exchange, central office terminal's CPU IMU is crossed public number signaling channel notice remote termination CPU, after remote termination CPU learns this information, with these two masters, the called subscriber continues in the mode of inner exchanging, directly will lead, the called subscriber connects, discharge the digital voice channel between central office terminal and remote termination, but the master of central office terminal, called subscriber's mouth shows busy, until their talk-through, the caller Called Onhook, so just guaranteed the Fare determined by travel time of telephone office, saved the digital voice channel simultaneously again conversing between any two telephone subscribers of remote termination.
When some users of remote termination are called, its signaling process and handshaking procedure are: the CPU of central office terminal has detected bell signal from a certain with the registered permanent residence, this CPU is routed to this user the digital voice channel of a free time through on-line file, and simultaneously will be for information about by public number signaling channel notice remote termination CPU, remote termination CPU sends bell signal to corresponding user, connect the corresponding digital voice channel simultaneously, behind the called off-hook of remote termination, remote termination CPU notifies the CPU of central office terminal, the CPU of central office terminal is with called local side registered permanent residence off-hook, both sides' conversation, behind the talk-through Called Onhook, far-end CPU notice local side CPU with the on-hook of corresponding local side called subscriber mouth, discharges the digital voice channel between local side and far-end simultaneously.
Referring to Fig. 4, digital network interface DNIC is the two wires mouth, can realize the high-speed data of full duplex transmission 160kbps, it is formed as shown, be characterized in adopting analog and digital signal to handle the technology that combines, realized full duplex transmission that the adaptive equalization echo suppresses on domestic consumer's telephone wire and the function that receives.
4 tunnel multiplexing digital telephone signal and signaling control signals are input to IDL buffer storage 2 by IDL RX through digital line interface 1, form circuit 4 through disarrangement device 3, frame structure and will import the data-signal that data conversion is a random sequence, frame structure in accordance with regulations is with the random sequence data frame structureization, form circuit 5, transmitting filter 6 and send driver 7 through base band data again, the binary data-signal of 160kbps is transformed to the base-band data signal that is fit to the subscriber's line transmission, delivers on the subscribers feeder by outer line interface 8 and transmit.The echo-signal that is coupled to receiving terminal base-band data signal of sending here from far-end and the local base-band data signal that sends is input to the input of base band data demodulator 9 together, this part signal is through receiving filter 10 outputs, with the output signal of echo suppressor 11, output signal addition stack in ∑ of DFF 12.The echo-signal size that echo suppressor 11 calculates in the receiving branch, and form this signal, from the signal of receiving filter 10 outputs, deduct this echo-signal again, the data-signal that the only remaining far-end of ∑ output is sent here, the phase distortion that remote signaling forms in transmission is proofreaied and correct by DFF 12, ∑ output reverts to the binary data signal of 160bps again through data decision 13, this data-signal is after separating frame and descrambler 14, pass through IDL buffer 15 again, digital line interface 1 is exported by IDL TX.The control of digital network interface and the realization of state are by a series connection control mouthful 16 realizations, and it is the Microprocessor Interface of a standard, and 17 is clock regenerator among the figure.
Native system can join with all kinds of city of program control type, cross type or stepping office switch, and system forms and relevant the key technical indexes sees the following form.
| The telephone door number | The relay ring way | Every telephone traffic | The percent of call lost | |
| 8 | 1 pair | ＞0.19ERL | ＜0.5％ | 8 |
| 16 | 2 pairs | ＞0.19ERL | ＜0.5％ | 8 |
| 24 | 2～3 pairs | ＞0.19ERL | ＜0.5％ | ＞8 |
| 32 | 3 pairs | ＞0.19ERL | ＜0.5％ | ＞10 |
| 48 | 4 pairs | ＞0.19ERL | ＜0.5％ | 12 |
| 64 | 5 pairs | ＞0.19ERL | ＜0.5％ | ＞12 |
| 96 | 7 pairs | ＞0.19ERL | ＜0.5％ | ＞12 |
| 128 | 9 pairs | ＞0.2ERL | ＜0.5％ | ＞14 |
| 256 | 15～18 pairs | ＞0.2ERL | ＜0.5％ | ＞17 |
| 512 | 32 pairs | ＞0.2ERL | ＜0.5％ | 16 |
Because functions such as system has that digital time-division is multiplexing, DNIC and inner exchanging, thereby obtained high concentrated ratio, the Bulk Call and the low percent of call lost, only need general user's line to be connected between central office terminal and remote termination, when the service cable line directly was 0.5mm, transmission range was 5.4km, when the service cable line directly is 0.4mm, transmission range is 3.6km, need not to install in the line regenerative repeater.
System of the present invention can utilize former wired middle road to carry out the phone increase-volume, 32 Digital Subscriber Loop concentrator systems of one cover for example are installed, only need 3 pairs of subscribers feeders between 32 call gate users and Local Exchange, can save 27 pairs of subscribers feeders, and convenient much more economical than using private branch exchange in the telephone service service.
The seriation unit that native system constitutes can see the above table, it is little of 8, greatly to 512, adopt distribution control mode, the elementary cell of modular construction is an elementary cell with 32 for example, can constitute 4 * 32=128 door, 8 * 32=256 door, 16 * 32=512 door or the like Digital Subscriber Loop concentrator system.Its constituted mode is: except that several elementary cells, only need increase master cpu, switching matrix and main system digital signalling channel etc. in the common set.
Claims (2)
1. Digital Subscriber Loop concentrator system, constitute by central office terminal, relay ring route, remote termination, central office terminal comprises the local user's interface that is connected with local exchange, the digital junction network interface that is connected with trunk, electron exchange matrix between two interfaces and CPU control assembly, remote termination comprises the digital junction network interface that is connected with the relay ring route, the remote subscriber interface that is connected with the telephone subscriber, electron exchange matrix between two interfaces and CPU control assembly thereof is characterized in that:
1) the electron exchange matrix of described central office terminal is made of existing matrixing network that function of exchange is arranged again and the digital multi-channel time division multiplex system with compression coding and decoding function concentrated;
2) the electron exchange matrix of described remote termination is made of existing matrixing network that the inner exchanging function is arranged again and the digital multi-channel time division multiplex system with compression coding and decoding function concentrated;
3) described digital junction network interface is made up of high speed, wideband data transmission system that the analog and digital signal processing combines;
4) described relay ring route is common not loading service cable, and every pair of subscribers feeder contains several digital voice channel and a high speed common data signaling channel.
2. the feature of Digital Subscriber Loop concentrator according to claim 1 system is that average a pair of relay ring route can connect at least 8 above remote termination telephone subscribers.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 93108699 CN1031775C (en) | 1993-07-23 | 1993-07-23 | Digital user loop central machine system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 93108699 CN1031775C (en) | 1993-07-23 | 1993-07-23 | Digital user loop central machine system |
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| Publication Number | Publication Date |
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| CN1097913A CN1097913A (en) | 1995-01-25 |
| CN1031775C true CN1031775C (en) | 1996-05-08 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN 93108699 Expired - Fee Related CN1031775C (en) | 1993-07-23 | 1993-07-23 | Digital user loop central machine system |
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| KR101779614B1 (en) * | 2011-06-08 | 2017-09-18 | 엘에스산전 주식회사 | Inverter communication system |
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