CN106603186A - ONU time synchronization processing system and method based on the GPON system in the class B PON protection - Google Patents
ONU time synchronization processing system and method based on the GPON system in the class B PON protection Download PDFInfo
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- CN106603186A CN106603186A CN201611177943.7A CN201611177943A CN106603186A CN 106603186 A CN106603186 A CN 106603186A CN 201611177943 A CN201611177943 A CN 201611177943A CN 106603186 A CN106603186 A CN 106603186A
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- onu
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04J—MULTIPLEX COMMUNICATION
- H04J3/00—Time-division multiplex systems
- H04J3/02—Details
- H04J3/06—Synchronising arrangements
- H04J3/0635—Clock or time synchronisation in a network
- H04J3/0638—Clock or time synchronisation among nodes; Internode synchronisation
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B10/00—Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
- H04B10/03—Arrangements for fault recovery
- H04B10/032—Arrangements for fault recovery using working and protection systems
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04J—MULTIPLEX COMMUNICATION
- H04J3/00—Time-division multiplex systems
- H04J3/02—Details
- H04J3/06—Synchronising arrangements
- H04J3/0635—Clock or time synchronisation in a network
- H04J3/0638—Clock or time synchronisation among nodes; Internode synchronisation
- H04J3/0658—Clock or time synchronisation among packet nodes
- H04J3/0661—Clock or time synchronisation among packet nodes using timestamps
- H04J3/0667—Bidirectional timestamps, e.g. NTP or PTP for compensation of clock drift and for compensation of propagation delays
Abstract
The invention relates to an ONU time synchronization processing system and method based on the GPON system in the class B PON protection. The method comprises the following steps. When the method is in an O5 work state and the main chip of the ONU (optical network unit) receives the ToD (Time of the Day) released by an OLT (Optical Line Terminal), the ONU uses the GEM frame characteristics of an optical path and the ToD information to calculate the time; when the class B PON protection occurs and the state of the ONU jumps from O5 to O6, then, the main chip of the ONU uses a local crystal oscillator to calculate time. With the two modes, the main chip is capable of obtaining the correct time in a sustained manner. According to the ONU time synchronization processing system and method based on the GPON system in the class B PON protection proposed by the invention, it is possible to enable the clock time delay of salve equipment at the downstream of an ONU to meet the standards without incurring sudden changes.
Description
Technical field
The present invention relates to communication technical field, more particularly to the process of ONU precise synchronizations, specifically refer to a kind of base
ONU time synchronizing system and method when GPON systems are protected in B classes PON.
Background technology
GPON (Gigabit-Capable PON) technology is the latest generation broadband passive based on ITU-TG.984.x standards
Light Integrated access standard, with high bandwidth, high efficiency, large coverage, user interface is abundant to wait many merits, by great majority fortune
Battalion business be considered as realization access network service it is broadband, synthesization transformation desirable technique.
GPON is organized in September, 2002 by FSAN earliest and proposes that ITU-T is completed in March, 2003 on this basis
ITU-T formulations G.984.1 and G.984.2, the standardization for completing with June G.984.3 for 2 months 2004.So as to ultimately form
The family of standards of GPON.
GPON technologies originate from the ATMPON technical standards that nineteen ninety-five starts to gradually form, and PON is English " passive optical network
The abbreviation of network ".And GPON (Gigabit-Capable Passive Optical Network) is organized in 2002 by FSAN earliest
Year September proposes, ITU-T completes ITU-T formulations G.984.1 and G.984.2 on this basis in March, 2003,2004
The standardization for completing with June G.984.3 for 2 months.So as to ultimately form the family of standards of GPON.
Equipment basic structure based on GPON technologies is similar with existing PON, and the OLT optical line terminals by local side,
The ONT/ONU ONT Optical Network Terminals (optical network unit) of user side, connection first two equipment, by single-mode fiber SM fiber and passive
The ODN Optical Distribution Networks and network management system composition of beam splitter Splitter compositions.
Power industry is developed rapidly, and relative automated production also constantly increases, in many fields of power system,
Such as sequence of event, relay protection, fault localization, electric energy tariffing, real-time information collection etc. field has been required for one
Unified, high-precision time reference, therefore a high-precision time synchronism equipment is very important.
The content of the invention
The purpose of the present invention is to overcome above-mentioned shortcoming of the prior art, there is provided one kind ensures the protection of B classes PON
The ONU of Shi Suoshu carry out precise synchronization based on GPON systems in B classes PON protect when ONU time synchronized at
Reason system and method.
In order to realize above-mentioned purpose, the present invention's is in ONU time synchronized when B classes PON are protected based on GPON systems
Processing system and its method are specific as follows：
ONU time synchronizing systems when B classes PON are protected should be in based on GPON systems, which is mainly characterized by, described
The ONU time synchronizing systems time synchronized module that includes an ONU master chips and be connected with the ONU master chips, it is described
ONU master chips be connected with an OLT by optical link, described OLT includes PON plates, wherein,
Described OLT is to issue ToD information to described ONU master chips；
Described ONU master chips are to detect current ONU states, and the ONU described in obtaining is under different conditions
Temporal information, and the temporal information under corresponding different conditions is sent to by described time synchronized according to current ONU states
Module；
Described time synchronized module obtains parsing temporal information to parse the temporal information received by which, and will
Described parsing temporal information is set to clock Master equipment.
It is preferred that described optical link includes main optical link with standby optical link.
More preferably, ONU states include under O5 states and O6 states, and described O5 states, described primary link to
The connection between described OLT and described ONU master chips is realized, under described O6 states, described reserve link is to reality
Connection between existing described OLT and described ONU master chips.
More preferably, the PON plates on described OLT include under main PON plates and standby PON plates, and described O5 states, institute
The main PON plates stated are to realize the connection between described OLT and described ONU master chips, under described O6 states, described
Standby PON plates to realize the connection between described OLT and described ONU master chips.
It is preferred that described time synchronized module is carried out with an accurate time synchronization protocol PTP by a Uniport interfaces
Information exchange.
Realize being in ONU method for synchronizing time when B classes PON are protected based on GPON systems using above-mentioned system, its master
Feature is wanted to be that described method is comprised the following steps：
(1) the ONU master chips described in obtain the local crystal oscillator time according to local crystal oscillator；
(2) the ONU master chips described in detect current ONU states, and obtain correspondence ONU shapes according to current ONU states
Temporal information under state, and corresponding temporal information is sent to into described time synchronized module；
(3) the time synchronized module described in parses the temporal information acquired in which and obtains parsing temporal information, and according to this
Parsing temporal information arranges described clock master.
It is preferred that described step (2) concretely comprise the following steps：
(2.1) whether the ONU master chips described in judge current ONU states as O5 states, if it is, continuing step
(2.2)；Otherwise continue described step (2.1)；
(2.2) the ONU master chips described in are believed according to the ToD that the GEM characteristics and described OLT in described optical link is issued
Breath obtains the temporal information under the O5 states, and the temporal information under the O5 states is sent to described time synchronized module,
And continue step (2.3)；
(2.3) the ONU master chips described in continue whether to judge current ONU states as O6 states, if it is, described
The local crystal oscillator time obtained by ONU master chips is sent to described time synchronized module, and continues described step (1)；
Otherwise continue described step (2.2).
More preferably, there is a step before described step (2.2)：
(2.2.0) the ONU master chips described in judge whether presently described ONU master chips receive what described OLT was issued
ToD information, if it is, continuing described step (2.1)；Otherwise continue described step (2.2.0).
More preferably, the temporal information under the O5 states in described step (2.2) includes the pulse signal that a cycle is 1s
And the ToD information that the described OLT being superimposed on the pulse signal is issued.
ONU time synchronizing system and method when B classes PON are protected are in based on GPON systems using this, due to
Which carries out judging to current ONU states, and obtain current ONU corresponding time letters under different conditions according to judged result
Breath, is reduced with this when the GPON systems occur the protection of B classes PON, and the system is due to when primary link is switched to reserve link
The ToD information transmitted in the different and described OLT of GEM frame characteristics can not be transferred to ONU master chips in time and cause
ONU time jump side problem.In by the present invention based on GPON systems in B classes PON protect when ONU time synchronized at
Reason system and method, can cause the time of downstream salve equipment of ONU when the protection of B classes PON occurs so as to which experiment is trembled
It is dynamic to reach standard, no longer there is very high saltus step.
Description of the drawings
Fig. 1 be the present invention based on GPON systems in B classes PON protect when ONU time synchronizing systems described in
System structural representation.
Fig. 2 is the method for being in ONU time synchronizing systems when B classes PON are protected based on GPON systems of the present invention
Schematic flow sheet.
Specific embodiment
In order to be more clearly understood that the technology contents of the present invention, describe in detail especially exemplified by following examples.
ONU time synchronizing systems when B classes PON are protected should be in based on GPON systems, which is mainly characterized by, described
The ONU time synchronizing systems time synchronized module that includes an ONU master chips and be connected with the ONU master chips, it is described
ONU master chips be connected with an OLT by optical link, described OLT includes PON plates, wherein,
Described OLT is to issue ToD information to described ONU master chips；
Described ONU master chips are to detect current ONU states, and the ONU described in obtaining is under different conditions
Temporal information, and the temporal information under corresponding different conditions is sent to by described time synchronized according to current ONU states
Module；
Described time synchronized module obtains parsing temporal information to parse the temporal information received by which, and will
Described parsing temporal information is set to clock Master equipment.
Described optical link includes main optical link with standby optical link.
ONU states include under O5 states and O6 states, and described O5 states that described primary link is described to realize
OLT and described ONU master chips between connection, under described O6 states, described reserve link is described to realize
Connection between OLT and described ONU master chips.
PON plates on described OLT include under main PON plates and standby PON plates, and described O5 states, described master
Want PON plates to realize the connection between described OLT and described ONU master chips, under described O6 states, described is standby
PON plates are to realize the connection between described OLT and described ONU master chips.
Described time synchronized module enters row information friendship by a Uniport interfaces and an accurate time synchronization protocol PTP
Mutually.
Realize being in ONU method for synchronizing time when B classes PON are protected based on GPON systems using above-mentioned system, its master
Feature is wanted to be that described method is comprised the following steps：
(1) the ONU master chips described in obtain the local crystal oscillator time according to local crystal oscillator；
(2) the ONU master chips described in detect current ONU states, and obtain correspondence ONU shapes according to current ONU states
Temporal information under state, and corresponding temporal information is sent to into described time synchronized module；
(3) the time synchronized module described in parses the temporal information acquired in which and obtains parsing temporal information, and according to this
Parsing temporal information arranges described clock master.
Described step (2) concretely comprise the following steps：
(2.1) whether the ONU master chips described in judge current ONU states as O5 states, if it is, continuing step
(2.2)；Otherwise continue described step (2.1)；
(2.2) the ONU master chips described in are believed according to the ToD that the GEM characteristics and described OLT in described optical link is issued
Breath obtains the temporal information under the O5 states, and the temporal information under the O5 states is sent to described time synchronized module,
And continue step (2.3)；
(2.3) the ONU master chips described in continue whether to judge current ONU states as O6 states, if it is, described
The local crystal oscillator time obtained by ONU master chips is sent to described time synchronized module, and continues described step (1)；
Otherwise continue described step (2.2).
There is a step before described step (2.2)：
(2.2.0) the ONU master chips described in judge whether presently described ONU master chips receive what described OLT was issued
ToD information, if it is, continuing described step (2.1)；Otherwise continue described step (2.2.0).
The temporal information under O5 states in described step (2.2) includes the pulse signal and the pulse that a cycle is 1s
The ToD information that the described OLT being superimposed on signal is issued.
In a kind of specific embodiment, when the process side that time synchronized on ONU when B classes PON are protected occurs in GPON systems
Method includes：
(1) time synchronized interaction between OLT and ONU：
OLT issues ToD information to ONU equipment by optical link, and hereafter, OLT issues a ToD at every fixed time
Information.
(2) the upper time synchronizings of ONU：
After ONU master chips receive ToD information, arrange in master chip, according to the characteristic and OLT of the GEM frames on optical link
On the ToD information that issues calculating the acquisition time.
And in a kind of specific embodiment, described ONU master chips pass through 1PPS (1Pulse per second)+TOD
The mode time is sent to clock synchronization module, and clock synchronization module and ONU upstream devices carry out the time using 1588V2 agreements
It is synchronous.
When described GPON systems occur the protection of B classes PON, the PON plates on described OLT change, by main PON plates
It is switched to standby PON plates；Optical link on described ONU changes, and is switched to standby optical link by main optical link.But
Key light link before ToD information correspondence, the standby optical link and ToD information after now ONU is according to switching are current to calculate
Then there is mistake in the time.Now ONU needs switching to obtain time source, the time after calculating according to local crystal oscillator.
ONU states from O5 jump to O6 when, the ToD that ONU is not issued further according to the GEM frames characteristic and OLT in optical link believes
Cease to calculate the time, but according to local crystal oscillator time and current time come the time after calculating.
After ONU states jump to O5 again, after OLT issues new ToD information, ONU is again switched to according to light
GEM frames characteristic and newest ToD information in link is calculating the time.
Technical scheme is as follows：
There is provided a kind of processing method of GPON systems time synchronized on its ONU when B classes PON protect generation：
Under normal condition, ONU master chips calculate the time using the GEM frames and ToD information in optical link, when B class PON bags
During containing occurring, the time is calculated using the local crystal oscillator time.
Described system includes ONU master chips and time synchronized module, and ONU master chips are special using the GEM frames in optical link
Property and ToD information calculating the time, send 1PPS+TOD to time synchronization module, time synchronized module parses the 1PPS+TOD and obtains
The time is taken, as master clocks, for downstream slave locks in time.
Additionally provide simultaneously a kind of based on GPON systems, the ONU equipment of carrying time synchronized：
Described ONU master chips obtain the GEM frame characteristics in optical link, and receive the ToD information that OLT is issued, and according to
GEM frames and ToD information in optical link is calculating the time, it is also possible to calculate the time according to the local crystal oscillator of itself.
The temporal information that described ONU master chips transmission 1PPS+ToD is combined gives time synchronized module
Time synchronized module receives pulse signal (1PPS+TOD) of described one cycle of TOD information convolution for 1s, and solves
Analysis 1PPS+TOD, the 1PPS+ToD after this is parsed is used as clock matser equipment.
Scheme by more than, when the protection of B classes PON occurs, will not cause the time on ONU because of the switching of optical link
Generation saltus step, ensures that using local crystal oscillator the time in the short time keeps.So that the clock delay of downstream clock slave meets
Standard.
In a kind of specific embodiment, when ONU master chips receive the ToD information that OLT is issued, ONU master chips according to
GEM frames characteristic and ToD information in optical link is calculating the time；When ONU states jump to O6 from O5, ONU master chips are used
Local crystal oscillator is calculating the time.
ONU time synchronizing system and method when B classes PON are protected are in based on GPON systems using this, due to
Which carries out judging to current ONU states, and obtain current ONU corresponding time letters under different conditions according to judged result
Breath, is reduced with this when the GPON systems occur the protection of B classes PON, and the system is due to when primary link is switched to reserve link
The ToD information transmitted in the different and described OLT of GEM frame characteristics can not be transferred to ONU master chips in time and cause
ONU time jump side problem.In by the present invention based on GPON systems in B classes PON protect when ONU time synchronized at
Reason system and method, can cause the time of downstream salve equipment of ONU when the protection of B classes PON occurs so as to which experiment is trembled
It is dynamic to reach standard, no longer there is very high saltus step.
In this description, the present invention is described with reference to its specific embodiment.But it is clear that can still make
Various modifications and alterations are without departing from spirit and scope of the invention.Therefore, specification and drawings be considered as it is illustrative and
It is nonrestrictive.
Claims (9)
1. it is a kind of that ONU time synchronizing systems when B classes PON are protected are in based on GPON systems, it is characterised in that described
The time synchronized module that ONU time synchronizing systems are included an ONU master chips and are connected with the ONU master chips, it is described
ONU master chips are connected with an OLT by optical link, and described OLT includes PON plates, wherein,
Described OLT is to issue ToD information to described ONU master chips；
Described ONU master chips are to detect current ONU states, and obtain times of the described ONU under different conditions
Information, and the temporal information under corresponding different conditions is sent to by described time synchronized module according to current ONU states；
Described time synchronized module obtains parsing temporal information to parse the temporal information received by which, and will be described
Parsing temporal information be set to clock Master equipment.
2. it is according to claim 1 that ONU time synchronizing systems when B classes PON are protected are in based on GPON systems, its
It is characterised by, described optical link includes main optical link with standby optical link.
3. it is according to claim 2 that ONU time synchronizing systems when B classes PON are protected are in based on GPON systems, its
It is characterised by, ONU states include that described primary link is to realize under O5 states and O6 states, and described O5 states
Connection between the OLT for stating and described ONU master chips, under described O6 states, described reserve link is described to realize
OLT and described ONU master chips between connection.
4. it is according to claim 2 that ONU time synchronizing systems when B classes PON are protected are in based on GPON systems, its
It is characterised by, the PON plates on described OLT are included under main PON plates and standby PON plates, and described O5 states, described master
Want PON plates to realize the connection between described OLT and described ONU master chips, under described O6 states, described is standby
PON plates are to realize the connection between described OLT and described ONU master chips.
5. it is according to claim 1 that ONU time synchronizing systems when B classes PON are protected are in based on GPON systems, its
It is characterised by, described time synchronized module enters row information friendship by a Uniport interfaces and an accurate time synchronization protocol PTP
Mutually.
6. when the system any one of a kind of utilization claim 1 to 5 realizes that being in B classes PON based on GPON systems protects
ONU method for synchronizing time, it is characterised in that described method is comprised the following steps：
(1) the ONU master chips described in obtain the local crystal oscillator time according to local crystal oscillator；
(2) the ONU master chips described in detect current ONU states, and are obtained under correspondence ONU states according to current ONU states
Temporal information, and corresponding temporal information is sent to into described time synchronized module；
(3) the time synchronized module described in parses the temporal information acquired in which and obtains parsing temporal information, and according to the parsing
Temporal information arranges described clock master.
7. it is according to claim 6 to realize being in ONU method for synchronizing time when B classes PON are protected based on GPON systems, its
It is characterised by, described step (2) concretely comprise the following steps：
(2.1) whether the ONU master chips described in judge current ONU states as O5 states, if it is, continuing step (2.2)；
Otherwise continue described step (2.1)；
(2.2) the ONU master chips described in are obtained according to the ToD information that the GEM characteristics and described OLT in described optical link is issued
Take the temporal information under the O5 states, and the temporal information under the O5 states is sent to into described time synchronized module, and after
Continuous step (2.3)；
(2.3) the ONU master chips described in continue whether to judge current ONU states as O6 states, if it is, described ONU
The local crystal oscillator time obtained by master chip is sent to described time synchronized module, and continues described step (1)；Otherwise
Continue described step (2.2).
8. it is according to claim 7 to realize being in ONU method for synchronizing time when B classes PON are protected based on GPON systems, its
It is characterised by before described step (2.2), also having a step：
(2.2.0) the ONU master chips described in judge whether presently described ONU master chips receive the ToD letters that described OLT is issued
Breath, if it is, continuing described step (2.1)；Otherwise continue described step (2.2.0).
9. it is according to claim 7 to realize being in ONU method for synchronizing time when B classes PON are protected based on GPON systems, its
It is characterised by, the temporal information under O5 states in described step (2.2) includes the pulse signal and the arteries and veins that a cycle is 1s
Rush the ToD information that the described OLT being superimposed on signal is issued.
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