CN107181989A - Passive optical network - Google Patents
Passive optical network Download PDFInfo
- Publication number
- CN107181989A CN107181989A CN201710597689.4A CN201710597689A CN107181989A CN 107181989 A CN107181989 A CN 107181989A CN 201710597689 A CN201710597689 A CN 201710597689A CN 107181989 A CN107181989 A CN 107181989A
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- China
- Prior art keywords
- passive optical
- side apparatus
- local side
- data
- onu
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Classifications
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04Q—SELECTING
- H04Q11/00—Selecting arrangements for multiplex systems
- H04Q11/0001—Selecting arrangements for multiplex systems using optical switching
- H04Q11/0062—Network aspects
- H04Q11/0067—Provisions for optical access or distribution networks, e.g. Gigabit Ethernet Passive Optical Network (GE-PON), ATM-based Passive Optical Network (A-PON), PON-Ring
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04Q—SELECTING
- H04Q11/00—Selecting arrangements for multiplex systems
- H04Q11/0001—Selecting arrangements for multiplex systems using optical switching
- H04Q11/0062—Network aspects
- H04Q2011/0079—Operation or maintenance aspects
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04Q—SELECTING
- H04Q11/00—Selecting arrangements for multiplex systems
- H04Q11/0001—Selecting arrangements for multiplex systems using optical switching
- H04Q11/0062—Network aspects
- H04Q2011/0079—Operation or maintenance aspects
- H04Q2011/0081—Fault tolerance; Redundancy; Recovery; Reconfigurability
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04Q—SELECTING
- H04Q11/00—Selecting arrangements for multiplex systems
- H04Q11/0001—Selecting arrangements for multiplex systems using optical switching
- H04Q11/0062—Network aspects
- H04Q2011/0086—Network resource allocation, dimensioning or optimisation
Landscapes
- Engineering & Computer Science (AREA)
- Computer Networks & Wireless Communication (AREA)
- Small-Scale Networks (AREA)
- Optical Communication System (AREA)
Abstract
The invention discloses a kind of passive optical network, it is based on serial communication protocol and system transparent transmission serial port protocol, and passive optical network is included：EPON ODN, multiple terminal devices ONU and local side apparatus OLT.EPON ODN includes optical fiber and passive optical splitters；Multiple terminal devices ONU user sides communication interface is serial ports, supports Uart data penetration transmissions, and multiple terminal devices ONU uses low speed optical module；And local side apparatus OLT uses low speed optical module, and local side apparatus OLT Network Side Interface supports Uart data penetration transmissions, and local side apparatus OLT sends downlink data to EPON ODN by optical fiber or receives the upstream data from user side multiple terminal devices ONU.Wherein, the input port of passive optical splitters is connected by optical fiber with local side apparatus OLT, and multiple output ports of passive optical splitters are connected by optical fiber with multiple terminal devices ONU respectively.Whereby, passive optical network of the invention, saves cost, reduces power consumption, and networking mode is flexible.
Description
Technical field
The present invention relates to technical field of optical fiber communication, more particularly to a kind of passive optical network.
Background technology
RS232/422/485 buses have the advantages that simple in construction, traffic rate is high, networking is convenient, are that industry spot is total
A kind of important communication mode of line.Because the most of working environments of automation equipment are severe, easily by various electromagnetic interferences
Influence, cable is as transmission medium, and communication reliability is not high；Cable transmission is apart from limited simultaneously, it is impossible to realize tens kilometers
Transmit over long distances.Using optical fiber as transmission medium, the problems such as solving the electromagnetic interference of serial data and transmit over long distances.String
Mouth optical fiber networking mode has serial ports light cat, three kinds of modes of EPA and EPON EPONs.
(1) serial ports light cat completes serial ports to the conversion of optical fiber, realizes that RS232/422/485 serial datas pass through the remote of optical fiber
Distance transparent is transmitted.Serial ports light cat is usually the networking mode of " point-to-point ", or multiple serial ports light cats synthesize an equipment and supported
" star-like " networking mode, for complex network, using " series connection " networking mode.Three kinds of mode common ground are every optical fiber
It is required for a pair of serial ports light cats.
(2) EPA and serial ports light cat scheme networking mode are just the same, are also " point-to-point ", " star-like " or " string
The networking modes such as connection "；Different from serial ports light cat transparent transmission serial data, EPA carries out the envelope of ethernet frame to serial data
Dress, is transmitted with ICP/IP protocol.What it is advantage of this is that network transmission is not only serial data, can also be transmitted other high
The Ethernet data of bandwidth.
(3) typical EPON (Ethernet Passive Optical Network) systems are by OLT, ONU, ODN
Composition.Local side apparatus OLT centre computer rooms；Terminal device ONU is placed near user equipment end；ODN is optical distribution, including
Passive optical splitters and optical fiber, connection OLT and ONU equipment, realize the network transmission of point to multi--point.EPON technologies are transported according to telecommunications
Seek business's high bandwidth and require design, and it is extensive commercial in the success of FTTC/FTTB/FTTH fields, led in power automation within this several years
Also more and more extensively, ONU equipment connects power equipment by RS485 interfaces, and serial data is packaged into ethernet frame for domain application
It is transferred to OLT device.Unlike telecom operators high bandwidth requirements, electric power is applied will to the cost and power consumption of EPON technologies
Ask high.
By studying prior art, it is easy to sum up existing scheme and have the following disadvantages：(1) for serial ports light
Cat and EPA scheme, every optical fiber are required for a pair of optical modules, and cost and power consumption are higher, are not suitable for complexity such as " tree-shaped "
Networking mode, " series connection " networking mode adds trouble point and the maintenance cost of system, and industrial environment power taking is also problem.
(2) for EPON in electric power application scheme, because EPON technologies are what high bandwidth business demand was customized, in the application of power system
Bandwidth availability ratio is extremely low, pursues the increase that high bandwidth brings cost and power consumption, does not meet the business demand of electric power.(3)EPON
Uart data are packaged into ethernet data frame by system when accessing Uart interfaces, very small for business datum amount
RS232/422/485 business, being encapsulated as ethernet frame is needed to increase the bytes such as a large amount of " frame head ", " postamble ", " fillings ", and network is passed
Defeated efficiency is very low
The information for being disclosed in the background section is merely intended to understanding of the increase to the general background of the present invention, without answering
When the prior art for being considered as recognizing or implying the information structure in any form well known to persons skilled in the art.
The content of the invention
It is an object of the invention to provide a kind of passive optical network, it can both realize that serial data passed through passive optical network
Network carries out the transmission of point-to-multipoint, can also meet low cost and the business demand of low-power consumption.
To achieve the above object, the invention provides a kind of passive optical network, it is based on serial communication protocol and is
System transparent transmission serial port protocol, passive optical network is included：EPON ODN, multiple terminal devices ONU and local side apparatus
OLT.EPON ODN includes optical fiber and passive optical splitters；Multiple terminal devices ONU user sides communication interface is serial ports, branch
Uart data penetration transmissions are held, and multiple terminal devices ONU uses low speed optical module；And local side apparatus OLT uses low speed optical module,
And local side apparatus OLT Network Side Interface supports Uart data penetration transmissions, local side apparatus OLT is by optical fiber to EPON ODN
Send downlink data or receive the upstream data from user side multiple terminal devices ONU.Wherein, the input of passive optical splitters
Mouth is connected by optical fiber with local side apparatus OLT, and multiple output ports of passive optical splitters pass through optical fiber and multiple terminals respectively
Equipment ONU connections, and data wherein in passive optical network are transmitted without being packaged with original frame format.
Preferably, in above-mentioned technical proposal, multiple terminal devices ONU low speed optical module and local side apparatus OLT low speed
Optical module is 2M low speed optical modules.
Preferably, in above-mentioned technical proposal, it is to use broadcast mode to send downlink data, and it is when using to receive upstream data
Divide access mode.
Preferably, in above-mentioned technical proposal, passive optical splitters maximum supports 1:512 splitting ratios.
Preferably, in above-mentioned technical proposal, the workflow for sending downlink data is included：In the working time of downlink data
In window, downlink data is pushed to multiple terminal devices ONU, multiple terminal devices by local side apparatus OLT using passive optical splitters
ONU opens receiving circuit, receives downlink data and is forwarded from serial ports；In the dormancy time window of downlink data, office
End equipment OLT is without converting downlink data, and multiple terminal devices ONU closes receiving circuit.
Preferably, in above-mentioned technical proposal, the workflow for sending the upstream data is included：The up of upstream data
Time is divided into multiple timeslices, and each terminal device ONU obtains the timeslice of equal length；Each terminal device ONU can only be
Upstream data is sent to local side apparatus OLT in one's own timeslice, and one is only transmitted by optical fiber in each timeslice
Individual upstream data is to local side apparatus OLT；Each terminal device ONU is outside the timeslice of oneself, and terminal device ONU, which is closed, sends electricity
Road.
Compared with prior art, the present invention has the advantages that：The passive optical network of the present invention, with serial ports light
Cat is compared with EPA scheme, has the advantages that：(1) EPON pattern, saves trunk optical fiber resource
With the quantity of optical module, cost and power consumption are reduced；(2) networking mode flexibly, is more suitable for the complicated network environment of industrial bus；
(3) system failure point is reduced, reliability is added, reduces maintenance cost.The passive optical network of the present invention, with EPON
Scheme is compared, and is had the advantages that：(1) passive optical network uses 2M low speed optical modules, saves cost, reduces
Power consumption.(2) because 2M low speed optical modules receiving sensitivity is high, transmission range is farther, and splitting ratio is bigger.
Brief description of the drawings
Fig. 1 is a kind of topological diagram of passive optical network according to the present invention.
Fig. 2 is a kind of workflow schematic diagram of the downlink data of passive optical network according to the present invention.
Fig. 3 is a kind of workflow schematic diagram of the upstream data of passive optical network according to the present invention.
Embodiment
Below in conjunction with the accompanying drawings, the embodiment to the present invention is described in detail, it is to be understood that the guarantor of the present invention
Shield scope is not limited by embodiment.
Explicitly indicated that unless otherwise other, otherwise in entire disclosure and claims, term " comprising " or its change
Change such as "comprising" or " including " etc. and will be understood to comprise stated element or part, and do not exclude other members
Part or other parts.
As shown in Figure 1 to Figure 3, according to a kind of passive optical network of the specific embodiment of the invention, it is based on serial ports
Communication protocol and system transparent transmission serial port protocol, and the communication system of passive optical network is point-to-multipoint communication system, nothing
Source optical network system is included：EPON ODN, multiple terminal devices ONU and local side apparatus OLT.EPON ODN bags
Containing optical fiber and passive optical splitters；Multiple terminal devices ONU user sides communication interface is serial ports, supports Uart (Universal
Asynchronous Receiver/Transmitter) data penetration transmission, and multiple terminal devices ONU uses 2M low speed optical modules,
Cost and power consumption are relatively low, and more preferably, terminal device ONU can be used as two kinds of forms of communication module or independent acquisition device to receiving sensitivity
In the presence of；And local side apparatus OLT uses 2M low speed optical modules, and local side apparatus OLT Network Side Interface supports that Uart data are saturating
Pass, local side apparatus OLT sends downlink data to EPON ODN by optical fiber or receives to come from user side multiple terminal devices
ONU upstream data.Wherein, the input port of passive optical splitters is connected by optical fiber with local side apparatus OLT, and passive optical splitters
Multiple output ports be connected respectively by optical fiber with multiple terminal devices ONU, and the number wherein in passive optical network
Frame format original according to this is transmitted without being packaged.
Preferably, highdensity local side apparatus OLT could support up 96 PON mouthfuls, and local side apparatus OLT can be used as an industry
The communication module form for equipment of being engaged in is present, so as to provide higher device integration；Passive optical splitters maximum supports 1:512 light splitting
Than.
Preferably, it is to use broadcast mode to send downlink data, and it is to use time division multiple acess pattern to receive upstream data.
Preferably, the workflow for sending downlink data is included：In the working time window of downlink data, local side apparatus
Downlink data is pushed to multiple terminal devices ONU by OLT using passive optical splitters, and multiple terminal devices ONU opens reception electricity
Road, receives downlink data and is forwarded from serial ports；In the dormancy time window of downlink data, local side apparatus OLT without
Converting downlink data, and multiple terminal devices ONU closes receiving circuit.
Preferably, the workflow for sending the upstream data is included：When the upstream time of upstream data is divided into multiple
Between piece, each terminal device ONU obtains the timeslice of equal length；Each terminal device ONU can only be in the one's own time
Upstream data is sent to local side apparatus OLT in piece, and a upstream data is only transmitted by optical fiber in each timeslice and is flow to
Local side apparatus OLT, it is to avoid the conflict between terminal device ONU upstreams, does not result in loss of data；Each terminal is set
Standby ONU is outside the timeslice of oneself, and terminal device ONU closes transtation mission circuit, so as to reduce power consumption.
In actual applications, the telecommunication of the kilowatt meter reading-out systems such as ammeter, water meter, gas meter, flow meter is the composite can be widely applied to,
The industrial field bus network of the automation control systems such as Internet of Things, industrial and mineral, traffic, building can also be applied to.The present invention's
Source optical network system is to be based on serial communication protocol and system transparent transmission serial port protocol, is encapsulated without any data, communication system
It is point-to-multipoint communication system, its local side apparatus OLT and terminal device ONU use 2M low speed optical modules, and 2M speed can expire
The bandwidth demand of sufficient serial data, relative to the 1000M high-speed optical modules of standard, cost and power consumption are relatively low, and receiving sensitivity
More preferably, and passive optical splitters maximum support 1:512 splitting ratios.
In summary, passive optical network of the invention, compared with serial ports light cat and EPA scheme, with such as
Lower beneficial effect：(1) EPON pattern, saves trunk optical fiber resource and the quantity of optical module, reduces cost and work(
Consumption；(2) networking mode flexibly, is more suitable for the complicated network environment of industrial bus；(3) system failure point is reduced, adding can
By property, maintenance cost is reduced.The passive optical network of the present invention, compared with EPON schemes, has the advantages that：
(1) passive optical network uses 2M low speed optical modules, saves cost, reduces power consumption.(2) because 2M low speed optical modules connect
Receive sensitivity high, transmission range is farther, and splitting ratio is bigger.
It is foregoing to the present invention specific illustrative embodiment description be in order to illustrate and illustration purpose.These descriptions
It is not wishing to limit the invention to disclosed precise forms, and it will be apparent that according to above-mentioned teaching, can be much changed
And change.The purpose of selecting and describing the exemplary embodiment is that explaining that the certain principles and its reality of the present invention should
With so that those skilled in the art can realize and using the present invention a variety of exemplaries and
A variety of selections and change.The scope of the present invention is intended to be limited by claims and its equivalents.
Claims (6)
1. a kind of passive optical network, it is based on serial communication protocol and system transparent transmission serial port protocol, it is characterised in that described
Passive optical network is included：
EPON ODN, it includes optical fiber and passive optical splitters；
Multiple terminal devices ONU, its user side communication interface is serial ports, supports Uart data penetration transmissions, and the multiple terminal is set
Standby ONU uses low speed optical module；And
Local side apparatus OLT, it uses low speed optical module, and the Network Side Interface of the local side apparatus OLT supports that Uart data are saturating
Pass, the local side apparatus OLT sends downlink data to the EPON ODN by the optical fiber or receives to come from user side
The multiple terminal device ONU upstream data；
Wherein, the input port of the passive optical splitters is connected by the optical fiber with the local side apparatus OLT, and described passive
Multiple output ports of optical splitter are connected by the optical fiber with the multiple terminal device ONU respectively, and
Data in wherein described passive optical network are transmitted without being packaged with original frame format.
2. passive optical network according to claim 1, it is characterised in that the multiple terminal device ONU's is described
Low speed optical module and the local side apparatus OLT low speed optical module are 2M low speed optical modules.
3. passive optical network according to claim 1, it is characterised in that it is using broadcast to send the downlink data
Pattern, it is to use time division multiple acess pattern to receive the upstream data.
4. passive optical network according to claim 1, it is characterised in that the passive optical splitters maximum supports 1:
512 splitting ratios.
5. passive optical network according to claim 3, it is characterised in that send the workflow of the downlink data
Comprising：
In the working time window of the downlink data, under the local side apparatus OLT will be described using the passive optical splitters
Row data are pushed to the multiple terminal device ONU, and the multiple terminal device ONU opens receiving circuit, under reception is described
Row data are simultaneously forwarded from the serial ports；With
In the dormancy time window of the downlink data, the local side apparatus OLT is without forwarding the downlink data, and institute
State multiple terminal devices ONU and all close receiving circuit.
6. passive optical network according to claim 3, it is characterised in that send the workflow of the upstream data
Comprising：
The upstream time of the upstream data is divided into multiple timeslices, each terminal device ONU obtains equal length
The timeslice；
Each terminal device ONU can only be described to local side apparatus OLT transmissions in the one's own timeslice
Upstream data, and a upstream data is only transmitted to the local side apparatus by the optical fiber in each timeslice
OLT；With
Each terminal device ONU is outside the timeslice of oneself, and the terminal device ONU closes transtation mission circuit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710597689.4A CN107181989A (en) | 2017-07-20 | 2017-07-20 | Passive optical network |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710597689.4A CN107181989A (en) | 2017-07-20 | 2017-07-20 | Passive optical network |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN107181989A true CN107181989A (en) | 2017-09-19 |
Family
ID=59838547
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201710597689.4A Pending CN107181989A (en) | 2017-07-20 | 2017-07-20 | Passive optical network |
Country Status (1)
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110312174A (en) * | 2019-07-23 | 2019-10-08 | 上海地面通信息网络股份有限公司 | A kind of private line network access system |
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2017
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