CN103684647A - Time delay eliminating method and device for PTP data packet when converted between Ethernet and E1 protocol - Google Patents
Time delay eliminating method and device for PTP data packet when converted between Ethernet and E1 protocol Download PDFInfo
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Abstract
The invention discloses a time delay eliminating method and a device for PTP data packets when converted between the Ethernet and the E1 protocol. The method comprises the following steps: (1) when the data packets are converted from the Ethernet to the E1 protocol, for a data packet whose sending time delay does not need to be calculated, the data packet is directly sent to a cache and waits for sending; and for a data packet whose sending time delay needs to be calculated, a sending time delay delta t is calculated at first, and then the obtained sending time delay delta t is stored; and timestamps in subsequent corresponding data packets are processed according to the sending time delay delta t so as to eliminate the sending time delay; (2) when the data packets are converted from the E1 protocol to the Ethernet, for a data packet whose timestamp does not need to be processed, the data packet is directly sent to the Ethernet; and for a data packet whose timestamp needs to be processed, the timestamp is processed according to the stored sending time delay delta t so as to eliminate the sending time delay. According to the invention, the time delay generated when the PTP data packets are converted between the Ethernet and the E1 can be effectively eliminated, that is the time delay jitter of a traditional link is compressed from tens of microseconds of a traditional E1 converter to the nanosecond level, so the link jitter can be greatly reduced, and the time service accuracy can be effectively improved.
Description
Technical field
The invention belongs to communication field, the method for the time delay producing when specifically a kind of PTP of elimination packet is changed between Ethernet and E1 agreement.
Background technology
PTP agreement, for the clock system of the packet switching network, can provide the clock synchronization accuracy of nanosecond, and the highest synchronization accuracy that can reach lower than 10 nanoseconds is also the current full accuracy Time synchronization technique based on Ethernet.Along with people require constantly to promote to timing tracking accuracy, PTP technology is also widely studied in worldwide, and has obtained significantly performance boost.The linked groups such as electric power and telecommunication system shows keen interest to it, electric power system has started application gradually, but PTP agreement is also just for the local area network (LAN) time service stage, because the reason of link flapping can't well be promoted in SDH transmission network at present.
Current transmission network is the theme with SDH transmission network.SDH technology with its reliability, controllability, autgmentability and perfect network system, is accounting for leading position in transmission network.SDH optical transmission becomes the first-selected carrier that adopts wired mode to realize precise synchronization with its distinctive advantage.This system not only has the superior function that transmits signal in Frequency Synchronization mode, and the functions such as processing to signal, monitoring are provided.Particularly SDH Self-healing Rings can be switched to rapidly extension wire after circuit breaks down in a few tens of milliseconds, recovers transfer function.These advantages of SDH optical transmission make it become the basic transmission network of multi-service digital network.
At present a lot of operators have abundant e1 resource, if PTP can be accessed in SDH and be transmitted and realize the synchronization accuracy that is less than 1us by E1, will reduce new equipment and drop into, improve the reliability of Time Synchronization Network, accelerate the speed of the extensive utilization of PTP simultaneously.
Above Vehicles Collected from Market, there is Ethernet to the conversion equipment of E1, E1 protocol converter.The Ethernet interface transmission rate of traditional E 1 protocol converter is 100Mbit/s, and E1 line speed is 2.046Mbit/s.The data characteristics of Ethernet interface is intermittent and sudden, and the data characteristics of E1 interface is constant rate of speed transmission.E1 protocol converter is exactly the bursty data buffer memory of Ethernet interface will be got off, and utilizes the message transmission rate of the level and smooth Ethernet interface of intermittent phase of Ethernet interface, to adapt to the constant rate of speed of E1 mouth, for Ethernet interface provides the transmission bandwidth that approaches 2.048Mbit/s.
PTP agreement carries link delay computing mechanism, if but while there is common E1 protocol converter in link, because Ethernet transmission rate is 100Mbit/s, and E1 line speed is 2.046Mbit/s, both differ nearly 50 times, and Ethernet data transmitting-receiving has intermittent and sudden, therefore forward delay interval value can be in 0-488 random fluctuation between nanosecond, this can cause PTP packet by the indeterminable delay of protocol converter, causes link delay shake excessive, causes time service precision to decline.
Summary of the invention
The technical problem that the present invention solves is, the mechanism of changing between a kind of Ethernet and E1 agreement is provided, and can effectively eliminate the time delay producing in transfer process, effectively reduces link flapping, raising time service precision.
For solving the problems of the technologies described above, the present invention by the following technical solutions:
The time delay removing method that PTP packet is changed between Ethernet and E1 agreement, (1) packet is during from Ethernet to E1 protocol conversion, and to not needing to calculate the packet of transmission delay, directly to send into buffer memory etc. to be sent; To calculating the packet of transmission delay, first calculate transmission delay △ t, then the transmission delay △ t obtaining is stored; And according to transmission delay △ t, the timestamp in follow-up corresponding data bag is processed to eliminate transmission delay; (2), when packet is changed from E1 agreement to Ethernet, to not needing the packet of processing time stamp, directly push Ethernet to; The packet that needs processing time stamp, processes to eliminate forward delay interval according to the transmission delay △ t having stored to timestamp.
First packet during from Ethernet to E1 protocol conversion, for Sync, DelayReq, PdelayReq or PdelayResp packet, reads and waits for time started stamp T1 from the steady clock of height; After receiving the ready for sending signal of E1 agreement, from the steady clock of height, read and wait for end time stamp T2, (T2-T1) obtains transmission delay △ t.
Packet during from Ethernet to E1 protocol conversion, for Follow_up packet, obtains the transmission delay △ t of Sync packet on the same group, then the transmitting time stamp t1 of Follow_up packet is adjusted into (t1+ △ t).
Packet during from Ethernet to E1 protocol conversion, for PdelayRespFollowUp packet, obtains the transmission delay △ t of PdelayResp on the same group, then the transmitting time stamp t3 of PdelayRespFollowUp packet is adjusted into (t3+ △ t).
The time delay cancellation element that PTP packet is changed between Ethernet and E1 agreement, it comprises: Ethernet receiver module, for receiving the packet from Ethernet, and by Packet Generation to PTP Ethernet identification module; PTP Ethernet identification module, according to protocol number, whether identification is PTP packet; If not abandon this packet; If according to PTP type of message, judge whether this PTP packet needs to calculate forward delay interval; High steady clock module, provides high-accuracy stable timestamp; Send buffer memory and time delay logging modle, to not needing to calculate the packet of transmission delay, directly to send into buffer memory etc. to be sent; To needing the packet of calculation delay, first calculate transmission delay △ t, then the transmission delay △ t obtaining is stored in delay value memory module, in needs handle packet, during timestamp, transmission delay △ t is sent in forward delay interval processing module; E1 sending module when E1 agreement ready for sending, takes out to send and waits for that packet is sent to E1 link from send buffer memory and delay process module; E1 receiver module, for receiving the packet from E1 link, and by Packet Generation to PTP E1 identification module; PTP E1 identification module, according to protocol number, whether identification is PTP packet; If not abandon this packet; If packet being delivered to forward delay interval processing module is for further processing; Forward delay interval processing module, carries out respective handling according to PTP type of data packet, and to not needing the packet of processing time stamp, direct method is to Ethernet; To needing the packet of processing time stamp, according to the transmission delay △ t in delay value memory module, timestamp is processed to eliminate forward delay interval, then be sent to Ethernet; Ethernet sending module, is sent to Ethernet by the PTP packet receiving.
The time delay that time delay cancellation element is applied in SDH network is eliminated a system, the time delay cancellation element that it comprises SDH network and is arranged on SDH network input and output, and each time delay cancellation element is all connected with the master and slave clock of PTP separately.
Adopt the present invention of technique scheme, comprise and send buffer memory and delay process module, delay value memory module and forward delay interval processing module, wherein send buffer memory and delay process module is carried out respective handling according to PTP type of data packet, to recording the packet of time delay, calculate transmission delay storage for the processing data packets of follow-up respective type; Delay value memory module is stored the forward delay interval that various PTP packets produce when conversion; Forward delay interval processing module processes to eliminate forward delay interval according to the information recording in PTP data type and delay value memory module to corresponding packet.The present invention can effectively eliminate the time delay that PTP packet produces in Ethernet and E1 transfer process, can be by traditional chain-circuit time delay shake by the tens delicate nanosecond that are compressed on traditional E 1 transducer, significantly reduce link flapping, effectively improved time service precision.
Accompanying drawing explanation
Fig. 1 is two and based on PTP packet, between Ethernet and E1 agreement, changes the system construction drawing that time delay cancellation element forms.
Fig. 2 changes time delay cancellation element schematic diagram between Ethernet and E1 agreement based on PTP packet.
Fig. 3 is the program flow diagram that sends buffer memory and time delay logging modle.
Fig. 4 is the program flow diagram of forward delay interval processing module.
Embodiment
As shown in Figure 2, the time delay removing method that a kind of packet is changed between Ethernet and E1 agreement, it comprises:
(1), when packet is from Ethernet to E1 protocol conversion, to not needing to calculate the packet of transmission delay, directly to send into buffer memory etc. to be sent; To calculating the packet of transmission delay, first calculate transmission delay △ t, then the transmission delay △ t obtaining is stored, and according to transmission delay △ t, the timestamp in follow-up corresponding data bag is processed to eliminate transmission delay;
(2), when packet is changed from E1 agreement to Ethernet, to not needing the packet of processing time stamp, directly push Ethernet to; The packet that needs processing time stamp, processes to eliminate forward delay interval according to the transmission delay △ t having stored to timestamp.
Specifically, when being changed to E1 by Ethernet, embodiment is as follows:
1, protocol conversion apparatus receives Ethernet data bag.
2, according to protocol number, determining whether PTP packet, is not to abandon this packet; If PTP data judge PTP type of data packet:
If it is to be sent that a) Announce, DelayResp, Follow_up and tetra-kinds of messages of PdelayRespFollowUp are directly sent into transmission buffer memory and time delay logging modle etc.;
B), if Sync, DelayReq, PdelayReq and tetra-kinds of messages of PdelayResp obtain wait time started stamp T1 from the steady clock module of height, send into afterwards and send the pending rear and transmission such as buffer memory and time delay logging modle.
3, in sending buffer memory and time delay logging modle, according to different PTP type of data packet, process accordingly respectively, referring to Fig. 3:
If bis-kinds of messages of i Announce and DelayResp do not carry out any operation, wait to be sent;
The wait time delay that if ii is Sync, DelayReq, PdelayReq and tetra-kinds of packets needs of PdelayResp record them, after receiving the ready for sending signal of E1 sending module, from the steady clock module of height, obtain to send and wait for end time stamp T2, (T2-T1) obtains transmission delay △ t, transmission delay △ t sent into delay value memory module and store; Packet is sent into E1 sending module to be sent immediately;
If bis-kinds of packets of iii Follow_up and PdelayRespFollowUp are processed respectively: for Follow_up packet, from delay value memory module, take out the forward delay interval value △ t of Sync message on the same group, then the transmitting time stamp t1 of Follow_up packet is adjusted into (t1+ △ t) and again writes into Follow_up packet, this step is processed and can be made Sync message reach the effect of transparent transmission.For PdelayRespFollowUp packet, obtain the transmission delay △ t of PdelayResp on the same group, then the transmitting time stamp t3 of PdelayRespFollowUp packet is adjusted into (t3+ △ t), and then again write into PdelayRespFollowUp packet, this step is processed and can be made PdelayResp packet reach the effect of transparent transmission; Message is sent into E1 sending module and is sent immediately afterwards.
4, E1 sending module is sent to E1 link by packet after ready.
When being changed to Ethernet by E1, embodiment is as follows:
1, protocol conversion apparatus receives E1 bag.
2, according to protocol number, determining whether PTP packet, is not to abandon this packet; If send into forward delay interval processing module.
3, in forward delay interval processing module, according to different PTP type of data packet, process accordingly respectively, referring to Fig. 4:
If a) Announce, Sync, Follow_up, DelayReq, PdelayReq and six kinds of messages of PdelayRespFollowUp do not carry out any operation, directly deliver to Ethernet sending module;
B) if bis-kinds of messages of DelayResp and PdelayResp process respectively: DelayResp message takes out the forward delay interval value △ t of DelayReq message on the same group from delay value memory module, DelayResp message comprises DelayReq stabs after t2-△ t from newly writing into DelayResp message the time of advent, and this step is processed and can be made DelayReq message reach the effect of transparent transmission; PdelayResp message takes out the forward delay interval value △ t of PdelayReq message on the same group from delay value memory module, PdelayResp message comprises PdelayReq stabs after t2-△ t from newly writing into PdelayResp message the time of advent, and this step is processed and can be made PdelayReq message reach the effect of transparent transmission; Message is sent into Ethernet sending module afterwards.
4, Ethernet sending module is sent to Ethernet by packet.
As shown in 2, a kind ofly based on PTP packet, between Ethernet and E1 agreement, change time delay cancellation element, comprising:
Ethernet receiver module, for receiving the packet from Ethernet, and by message sending value PTP identification module;
PTP Ethernet identification module, according to protocol number, whether identification is PTP packet; If not abandon this packet; If according to PTP type of message, judge whether this PTP message needs to record forward delay interval, if do not need directly to deliver to transmission buffer memory, if desired from the steady clock module of height, read and wait for time started stamp T1;
High steady clock module, for other modules provide high-accuracy stable timestamp;
Send buffer memory and delay process module, according to PTP type of data packet, carry out respective handling, it is to be sent that the packet that does not need to calculate transmission delay is directly sent into buffer memory etc.; If desired the packet of calculation delay obtains to send from the steady clock module of height and waits for end time stamp T2 after E1 ready for sending, and T2-T1 obtains forward delay interval value △ t, △ t is sent into delay value memory module and store the processing of wait follow-up data bag; If desired in handle packet, timestamp processes to eliminate forward delay interval according to canned data in delay value memory module to timestamp, waits for that afterwards E1 sends;
E1 sending module because E1 link data transmission rate is fixed, waits for that from transmission buffer memory and delay process module taking-up transmission packet is sent to E1 link when E1 ready for sending;
PTP E1 identification module, according to protocol number, whether identification is PTP packet; If not abandon this packet; If packet being delivered to forward delay interval processing module is for further processing;
Forward delay interval processing module, carries out respective handling according to PTP type of data packet, does not need the direct method of timestamp in handle packet to Ethernet; Need timestamp in handle packet according to the canned data in delay value memory module, timestamp to be processed to eliminate forward delay interval, then be sent to Ethernet;
Ethernet sending module, is sent to Ethernet by the PTP packet receiving.
As shown in Figure 1, a kind of time delay that above-mentioned time delay cancellation element is applied in SDH network is eliminated system, the time delay cancellation element that it comprises SDH network and is arranged on SDH network input and output, and each time delay cancellation element is all connected with the master and slave clock of PTP separately.
When PTP packet turns E1 by Ethernet, because Ethernet transmitting-receiving speed is nearly 50 times that E1 receives and dispatches speed, forward delay interval is in 0-488 random fluctuation between nanosecond, need this device that the forward delay interval of PTP part type message is recorded and stored, for follow-up corresponding PTP message, process to eliminate the forward delay interval of part message; When PTP packet turns Ethernet by E1, because sending the stand-by period, Ethernet only had for 10 nanoseconds, therefore without recording this forward delay interval value, only need to process this device according to the forward delay interval value of PTP type of message and storage, eliminate the forward delay interval of part message.
Claims (6)
1. the time delay removing method that PTP packet is changed between Ethernet and E1 agreement, is characterized in that, it comprises:
(1), when packet is from Ethernet to E1 protocol conversion, to not needing to calculate the packet of transmission delay, directly to send into buffer memory etc. to be sent; To calculating the packet of transmission delay, first calculate transmission delay △ t, then the transmission delay △ t obtaining is stored; And according to transmission delay △ t, the timestamp in follow-up corresponding data bag is processed to eliminate transmission delay;
(2), when packet is changed from E1 agreement to Ethernet, to not needing the packet of processing time stamp, directly push Ethernet to; The packet that needs processing time stamp, processes to eliminate forward delay interval according to the transmission delay △ t having stored to timestamp.
2. the time delay removing method that PTP packet according to claim 1 is changed between Ethernet and E1 agreement, it is characterized in that: packet is during from Ethernet to E1 protocol conversion, for Sync, DelayReq, PdelayReq or PdelayResp packet, first from the steady clock of height, read and wait for time started stamp T1; After receiving the ready for sending signal of E1 agreement, from the steady clock of height, read and wait for end time stamp T2, (T2-T1) obtains transmission delay △ t.
3. the time delay removing method that PTP packet according to claim 2 is changed between Ethernet and E1 agreement, it is characterized in that: packet is during from Ethernet to E1 protocol conversion, for Follow_up packet, obtain the transmission delay △ t of Sync packet on the same group, then the transmitting time stamp t1 of Follow_up packet is adjusted into (t1+ △ t).
4. the time delay removing method that PTP packet according to claim 2 is changed between Ethernet and E1 agreement, it is characterized in that: packet is during from Ethernet to E1 protocol conversion, for PdelayRespFollowUp packet, obtain the transmission delay △ t of PdelayResp on the same group, then the transmitting time stamp t3 of PdelayRespFollowUp packet is adjusted into (t3+ △ t).
5. the time delay cancellation element that PTP packet is changed between Ethernet and E1 agreement, is characterized in that, it comprises:
Ethernet receiver module, for receiving the packet from Ethernet, and by Packet Generation to PTP Ethernet identification module;
PTP Ethernet identification module, according to protocol number, whether identification is PTP packet; If not abandon this packet; If according to PTP type of message, judge whether this PTP packet needs to calculate forward delay interval;
High steady clock module, provides high-accuracy stable timestamp;
Send buffer memory and time delay logging modle, to not needing to calculate the packet of transmission delay, directly to send into buffer memory etc. to be sent; To needing the packet of calculation delay, first calculate transmission delay △ t, then the transmission delay △ t obtaining is stored in delay value memory module, in needs handle packet, during timestamp, transmission delay △ t is sent in forward delay interval processing module;
E1 sending module when E1 agreement ready for sending, takes out to send and waits for that packet is sent to E1 link from send buffer memory and delay process module;
E1 receiver module, for receiving the packet from E1 link, and by Packet Generation to PTP E1 identification module;
PTP E1 identification module, according to protocol number, whether identification is PTP packet; If not abandon this packet; If packet being delivered to forward delay interval processing module is for further processing;
Forward delay interval processing module, carries out respective handling according to PTP type of data packet, and to not needing the packet of processing time stamp, direct method is to Ethernet; To needing the packet of processing time stamp, according to the transmission delay △ t in delay value memory module, timestamp is processed to eliminate forward delay interval, then be sent to Ethernet;
Ethernet sending module, is sent to Ethernet by the PTP packet receiving.
6. the time delay that time delay cancellation element in claim 5 is applied in SDH network is eliminated system, it is characterized in that: the time delay cancellation element that it comprises SDH network and is arranged on SDH network input and output, and each time delay cancellation element is all connected with the master and slave clock of PTP separately.
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