CN108390796A - A kind of latency test method and device - Google Patents
A kind of latency test method and device Download PDFInfo
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- CN108390796A CN108390796A CN201810137125.7A CN201810137125A CN108390796A CN 108390796 A CN108390796 A CN 108390796A CN 201810137125 A CN201810137125 A CN 201810137125A CN 108390796 A CN108390796 A CN 108390796A
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L43/00—Arrangements for monitoring or testing data switching networks
- H04L43/08—Monitoring or testing based on specific metrics, e.g. QoS, energy consumption or environmental parameters
- H04L43/0852—Delays
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L43/00—Arrangements for monitoring or testing data switching networks
- H04L43/10—Active monitoring, e.g. heartbeat, ping or trace-route
- H04L43/106—Active monitoring, e.g. heartbeat, ping or trace-route using time related information in packets, e.g. by adding timestamps
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L43/00—Arrangements for monitoring or testing data switching networks
- H04L43/50—Testing arrangements
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Abstract
Present invention is disclosed a kind of latency test method and devices, are suitable for switch device.Method is included in local terminal switching equipment and remote switching carries out parameter setting；Local terminal switching equipment periodically sends the message with timestamp to remote switching, and remote switching replys the message with timestamp, and local terminal switching equipment receives message and calculates two-way real-time time delay and two-way average delay according to the timestamp in message.The present invention calculates two-way real-time time delay by exchange chip and two-way average delay, CPU directly read result of calculation, alleviates CPU burdens.
Description
Technical field
The present invention relates to a kind of network communication technology fields, more particularly, to a kind of latency test method and device.
Background technology
With the rapid development of Internet, network size constantly expands, network topology is increasingly complicated.Internet is from before
Information superhighway becomes worldwide waiting.Various procotol tissues are primarily upon the reachable of message, but less focus on
The arrival time of message, however the time delay that message reaches significantly impacts network service quality.In order to improve network server matter
Amount, need to find out network there are the problem of, it is common practice that network performance index is measured, to orientation problem, is solved
Problem.Network performance index includes time delay, flow etc., wherein it is also that most common network performance refers to that time delay, which is most important,
Mark.
Traditional measurement network delay be by send DM (Delay Measurement, delay testing) protocol massages,
Two-way timestamp is carried in message, and network delay is calculated by timestamp.However the processing of DM protocol massages is passed through mostly
CPU beats timestamp, then calculates network delay by CPU, considerably increases the burden of CPU.
Invention content
It is an object of the invention to overcome the deficiencies of existing technologies, a kind of latency test method and system are provided, are led to
It crosses exchange chip and calculates two-way real-time time delay and two-way average delay, mitigate CPU burdens.
To achieve the above object, the following technical solutions are proposed by the present invention：A kind of latency test method, including walk as follows
Suddenly：
S1, carries out parameter configuration in local terminal switching equipment, and the parameter includes message sending cycle Interval, time
Initial position Offset, packet counting Count are stabbed, and whether receives message Received, while in remote switching
Configure identical timestamp initial position Offset；
S2, when message sending cycle reaches, local terminal switching equipment judges whether to receive whether message Received is 1, if
It is then directly to execute step S3, otherwise, after calculating two-way real-time time delay and two-way average delay, executes step S3；
S3, packet counting Count values add 1, and current time stamp and current message are counted in Count values deposit message,
Message Received, which whether will be received, after transmission message to remote switching is set to 0；
The timestamp for receiving message and the timestamp for sending message are stored in message and are sent to by S4, remote switching
Local terminal switching equipment；
S5, local terminal switching equipment judge packet counting Count values and packet counting Count in local terminal switching equipment in message
Whether value is consistent, if so, it is 1 that whether configuration, which receives message Received, while calculating two-way real-time time delay and two-way average
Time delay further executes step S2~S5.
Preferably, step S1 further includes being configured to the caching Buff that storage sends message in local terminal switching equipment.
Preferably, it stores local terminal switching equipment in message successively since the Offset of timestamp initial position and sends message
Timestamp, remote switching receive the timestamp of the timestamp and remote switching transmission message of message.
Preferably, in step S2, the two-way real-time time delay and two-way average delay are calculated according to following formula：
Delay_L=Interval/2；Delay_R=Interval/2；
Average_L=Total_L/Count, Total_L=Total_L+Delay_L；
Average_R=Total_R/Count, Total_R=Total_R+Delay_R；
Wherein, Delay_L is real-time time delay of the local terminal switching equipment to remote switching, and the distal ends Delay_R, which exchange, to be set
The real-time time delay of local terminal switching equipment to the utmost, Average_L are average delay of the local terminal switching equipment to remote switching,
Average_R is average delay of the remote switching to local terminal switching equipment, and Total_L is that local terminal switching equipment is handed over to distal end
The accumulated delay of exchange device, Total_R are accumulated delay of the remote switching to local terminal switching equipment.
Preferably, in step s 5, two-way real-time time delay and two-way average delay are calculated according to following formula：
Delay_L=R_RX_TS-L_TX_TS；Delay_R=L_RX_TS-R_TX_TS；
Average_L=Total_L/Count, Total_L=Total_L+Delay_L；
Average_R=Total_R/Count, Total_R=Total_R+Delay_R；
Wherein, Delay_L is real-time time delay of the local terminal switching equipment to remote switching, and Delay_R is that distal end exchanges
For equipment to the real-time time delay of local terminal switching equipment, Average_L is average delay of the local terminal switching equipment to remote switching,
Average_R is average delay of the remote switching to local terminal switching equipment, and R_RX_TS is that remote switching receives message
Timestamp, L_TX_TS be local terminal switching equipment send message timestamp, L_RX_TS be local terminal switching equipment receive message
Timestamp, R_TX_TS be remote switching send message timestamp, Total_L be local terminal switching equipment to distal end friendship
The accumulated delay of exchange device, Total_R are accumulated delay of the remote switching to local terminal switching equipment.
A kind of latency test device, including
Initiation parameter configuration module, for carrying out parameter configuration in local terminal switching equipment, the parameter includes message hair
Period Interval, timestamp initial position Offset, packet counting Count are sent, and whether receives message Received, together
When identical timestamp initial position Offset is configured in remote switching；
First judgment module receives whether message Received is 1 for judging whether when message sending cycle reaches；
Second judgment module, for judging packet counting Count values and packet counting in local terminal switching equipment in message
Whether Count values are consistent；
First message processing module (MPM), for packet counting Count values to be added 1, and by current time stamp and current message meter
In number Count value deposit messages, whether will receive message Received after transmission message to remote switching and be set to 0；
Second message processing module (MPM), the timestamp of timestamp and transmission message for remote switching to be received to message
In deposit message and it is sent to local terminal switching equipment；And
The first time-delay calculation module for calculating two-way real-time time delay and two-way average delay and the second time-delay calculation mould
Block.
Preferably, the initiation parameter module is also configured to the caching Buff of stored messages in local terminal switching equipment.
Preferably, it stores local terminal switching equipment in message successively since the Offset of timestamp initial position and sends message
Timestamp, remote switching receive the timestamp of the timestamp and remote switching transmission message of message.
Preferably, the first time-delay calculation module calculates two-way real-time time delay and two-way average delay according to following formula
Delay_L=Interval/2；Delay_R=Interval/2；
Average_L=Total_L/Count, Total_L=Total_L+Delay_L；
Average_R=Total_R/Count, Total_R=Total_R+Delay_R；
Wherein, Delay_L is real-time time delay of the local terminal switching equipment to remote switching, and the distal ends Delay_R, which exchange, to be set
The real-time time delay of local terminal switching equipment to the utmost, Average_L are average delay of the local terminal switching equipment to remote switching,
Average_R is average delay of the remote switching to local terminal switching equipment, and Total_L is that local terminal switching equipment is handed over to distal end
The accumulated delay of exchange device, Total_R are accumulated delay of the remote switching to local terminal switching equipment.
Preferably, whether the second time-delay calculation module will receive message Received and be configured to 1, and according to following public affairs
Formula calculates two-way real-time time delay and two-way average delay：
Delay_L=R_RX_TS-L_TX_TS；Delay_R=L_RX_TS-R_TX_TS；
Average_L=Total_L/Count, Total_L=Total_L+Delay_L；
Average_R=Total_R/Count, Total_R=Total_R+Delay_R；
Wherein, Delay_L is real-time time delay of the local terminal switching equipment to remote switching, and Delay_R is that distal end exchanges
For equipment to the real-time time delay of local terminal switching equipment, Average_L is average delay of the local terminal switching equipment to remote switching,
Average_R is average delay of the remote switching to local terminal switching equipment, and R_RX_TS is that remote switching receives message
Timestamp, L_TX_TS be local terminal switching equipment send message timestamp, L_RX_TS be local terminal switching equipment receive message
Timestamp, R_TX_TS be remote switching send message timestamp, Total_L be local terminal switching equipment to distal end friendship
The accumulated delay of exchange device, Total_R are accumulated delay of the remote switching to local terminal switching equipment.
The beneficial effects of the invention are as follows：
Compared with prior art, latency test method and device of the present invention is calculated double by exchange chip
To real-time time delay and two-way average delay, CPU directly reads result of calculation, reduces CPU computation burdens；Meanwhile the present invention is logical
The timestamp for being stored in nanosecond in delay testing message is crossed, computational accuracy is improved.
Description of the drawings
Fig. 1 is the latency test method flow diagram of the present invention；
Fig. 2 is that the local terminal switching equipment of the present invention sends Message processing flow chart；
Fig. 3 is that the remote switching of the present invention receives Message processing flow chart；
Fig. 4 is that the local terminal switching equipment of the present invention receives Message processing flow chart；
Fig. 5 is the latency test apparatus structure block diagram of the present invention.
Specific implementation mode
Below in conjunction with the attached drawing of the present invention, clear, complete description is carried out to the technical solution of the embodiment of the present invention.
A kind of disclosed latency test method and device, is mainly used in switch device, two-way reality
The calculating of Shi Shiyan and two-way average delay are completed by exchange chip, and CPU directly reads result of calculation, reduce CPU meters
Calculate burden.
As shown in Figure 1, a kind of latency test method, includes the following steps：
Step S1, carries out parameter configuration in local terminal switching equipment, the parameter include message sending cycle Interval,
Timestamp initial position Offset, packet counting Count, and message Received whether is received, while exchanging and setting in distal end
For the identical timestamp initial position Offset of middle configuration.
Specifically, Interval parameters are used to be arranged the sending cycle of delay testing message, are such as sent every 1 second or 5 seconds
Delay testing message；Offset parameters are used to that the initial position that the resting period stabs in delay testing message to be arranged, and are opened from Offset
Beginning, storage local terminal switching equipment successively sends message time stamp, remote switching receives message time stamp and remote switching
Send message time stamp.Preferably, 24 bytes in delay testing message since Offset are stabbed for the resting period, and every
A timestamp has the nanosecond of the second and 4 bytes of 4 bytes, therefore, the present invention can calculate nanosecond it is other two-way real-time when
Prolong and two-way average delay.
Count parameters are used to count the delay testing message number of local terminal switching equipment transmission, when implementation, Count parameters
Value needs carried in delay testing message, for being verified to the delay testing message received, it is ensured that local terminal exchange set
It is standby to receive the delay testing message currently sent out.Preferably, 4 bytes in delay testing message after timestamp are for depositing
Count numerical value is put, i.e. the 25th byte that Offset starts is for storing Count numerical value；Received parameters are for identifying this
Whether end switching equipment receives delay testing message.The Received parameter quilts when local terminal switching equipment time of receipt (T of R) test packet
It is set to 1, Received parameters are set to 0 after local terminal switching equipment transmission delay test packet.When implementation, Interval parameters,
Offset parameters, Count parameters and Received parameters can be configured by software, and when initial, Count parameters are set
It is set to 1 for 0, Received parameters.
Further, the buffering area (Buff) and delay testing report that are configured to send message are also needed in local terminal switching equipment
Text, which is sent, enables (Enable), can be configured by software.
Step S2, local terminal switching equipment judges whether Received is 1 when message sending cycle reaches, if so, executing
Otherwise step S3 after calculating two-way real-time time delay and two-way average delay, executes step S3；
Step S3, Count value adds 1, and will send message to remote in current time stamp and current Count values deposit message
Received is set to 0 after the switching equipment of end.
Specifically, in conjunction with shown in Fig. 1 and Fig. 2, when local terminal switching equipment transmission delay test packet, delay testing message hair
Enabled Enable is sent to be set to 1.When delay testing message sending cycle reaches, local terminal switching equipment sends first time delay and surveys
Message is tried to remote switching.Due to it is initial when Count be set to 0, Received and be set to 1, local terminal switching equipment is first
By Count plus 1, and message is read from Buff, current Count values 1 are stored in delay testing message, indicate that current local terminal is handed over
What exchange device was sent is the 1st delay testing message.Further, local terminal switching equipment will also in transmission delay test packet
It sends in the timestamp deposit delay testing message of the message, that is, is stored in 8 bytes that Offset starts.When delay testing report
When literary sending cycle arrives again at, local terminal switching equipment is according to the value of Received to determine whether needing transmission delay test report
Text is to remote switching.If local terminal switching equipment judges the value of Received for 0, then it represents that the time delay for not receiving transmission is surveyed
Message is tried, two-way time delay and two-way average delay are calculated according to following formula at this time.
Delay_L=Interval/2；Delay_R=Interval/2；
Average_L=Total_L/Count, Total_L=Total_L+Delay_L；
Average_R=Total_R/Count, Total_R=Total_R+Delay_R；
Wherein, real-time time delay of the Delay_L expression local terminal switching equipment to remote switching；Delay_R indicates distal end
Real-time time delay of the switching equipment to local terminal switching equipment；Total_L indicates local terminal switching equipment to the accumulative of remote switching
Time delay；Total_R indicates remote switching to the accumulated delay of local terminal switching equipment；Average_L indicates that local terminal exchange is set
The standby average delay for arriving remote switching；Average_R indicate remote switching to local terminal switching equipment average delay,
Interval indicates delay testing message sending cycle；Count indicates delay testing packet counting.
After two-way real-time time delay and two-way average delay calculate, local terminal switching equipment continues Count values adding 1, and
By in current time stamp and current Count values deposit message, sends message and be set to remote switching, while by Received
0。
The timestamp of the timestamp of message when receiving and transmission message is stored in message simultaneously by step S4, remote switching
It is sent to local terminal switching equipment.
Step S5, local terminal switching equipment judge whether Count values and Count values in local terminal switching equipment are consistent in message,
If so, configuration Received is 1, while two-way real-time time delay and two-way average delay are calculated, further execution step S2~
S5。
Specifically, in conjunction with shown in Fig. 3 and Fig. 4, remote switching is when receiving delay testing message, according to Offset's
The timestamp for receiving the message is stored in the corresponding position of message by value, when replying also according to Offset values by transmission delay
In the corresponding position of the time deposit message of test packet.If local terminal switching equipment receives delay testing message, further sentence
Whether the Count values that Count values and local terminal switching equipment record in disconnected delay testing message are consistent, if inconsistent, when to this
Delay test message does not make any processing；If consistent, then it represents that local terminal switching equipment has received the delay testing message currently sent out,
Two-way real-time time delay and two-way average delay are further calculated according to following calculation formula：
Delay_L=R_RX_TS-L_TX_TS；Delay_R=L_RX_TS-R_TX_TS；
Average_L=Total_L/Count, Total_L=Total_L+Delay_L；
Average_R=Total_R/Count, Total_R=Total_R+Delay_R；
Wherein, Delay_L is real-time time delay of the local terminal switching equipment to remote switching, and Delay_R is that distal end exchanges
For equipment to the real-time time delay of local terminal switching equipment, Average_L is average delay of the local terminal switching equipment to remote switching,
Average_R is average delay of the remote switching to local terminal switching equipment, and R_RX_TS is that remote switching receives message
Timestamp, L_TX_TS be local terminal switching equipment send message timestamp, L_RX_TS be local terminal switching equipment receive message
Timestamp, R_TX_TS be remote switching send message timestamp, Total_L be local terminal switching equipment to distal end friendship
The accumulated delay of exchange device, Total_R are accumulated delay of the remote switching to local terminal switching equipment, and Count surveys for time delay
Try packet counting.
After two-way real-time time delay and two-way average delay calculate, then step S2~S5 is continued to execute.It is sent in message
When period reaches, local terminal switching equipment continues to send the delay testing report for calculating two-way real-time time delay and two-way average delay
Text.After the completion of two-way real-time time delay and two-way average delay calculate, CPU can directly read data, greatly reduce the calculating of CPU
Burden.
As shown in figure 5, a kind of latency test device, including initiation parameter configuration module, the first judgment module,
Two judgment modules, the first message processing module (MPM), the second message processing module (MPM), the first time-delay calculation module and the second time delay meter
Calculate module.Wherein, initiation parameter configuration module includes report for carrying out parameter configuration, the parameter in local terminal switching equipment
Literary sending cycle Interval, timestamp initial position Offset, packet counting Count, and whether receive message
Received, while identical timestamp initial position Offset is configured in remote switching；First judgment module, is used for
Judge whether Received is 1 when message sending cycle reaches；Second judgment module is for judging Count values and sheet in message
Hold Count values in switching equipment whether consistent；First message processing module (MPM) is used to Count values adding 1, and by current time stamp and
In current Count values deposit message, Received is set to 0 after transmission message to remote switching；Second Message processing mould
Block is used to remote switching receiving the timestamp of message and sends in the timestamp deposit message of message and send message extremely
Local terminal switching equipment；First time-delay calculation module and the second time-delay calculation module are for calculating two-way real-time time delay and two-way average
Time delay.
Specifically, initiation parameter configuration module processing configuration Interval parameters, Offset parameters, Count parameters,
Outside Received parameters, also it is configured to send the buffering area Buff of message in local terminal switching equipment and delay testing message is sent
Enabled Enable, can be configured by software.Further, the transmission of local terminal switching equipment is stored successively since Offset
Message time stamp, remote switching receive message time stamp and remote switching sends message time stamp.Preferably, time delay
24 bytes in test packet since Offset are stabbed for the resting period, and each timestamp has the second and 4 of 4 bytes
The nanosecond of a byte, therefore, the present invention can calculate the other two-way real-time time delay of nanosecond and two-way average delay.
When message sending cycle reaches, the first judgment module judge Received values for 1 when, then enter the first message at
It manages module and carries out Message processing；When judge Received values for 0 when, then enter the first time-delay calculation module calculate it is two-way real-time when
Prolong and two-way average delay.Wherein, the first time-delay calculation module calculates two-way real-time time delay and two-way average according to following formula
Time delay：
Delay_L=Interval/2；Delay_R=Interval/2；
Average_L=Total_L/Count, Total_L=Total_L+Delay_L；
Average_R=Total_R/Count, Total_R=Total_R+Delay_R.
When local terminal switching equipment receives message, the second judgment module judges in message that Count values are exchanged with local terminal and sets
Whether standby middle Count values are consistent, if unanimously, entering the second time-delay calculation module and calculating two-way real-time time delay and two-way mean time
Prolong.Second time-delay calculation module calculates two-way real-time time delay and two-way average delay according to following formula：
Delay_L=R_RX_TS-L_TX_TS；Delay_R=L_RX_TS-R_TX_TS；
Average_L=Total_L/Count, Total_L=Total_L+Delay_L；
Average_R=Total_R/Count, Total_R=Total_R+Delay_R.
When implementation, it is embedded in exchange chip most preferably with latency test message device, the calculating of network delay is complete
It is completed by exchanger chip, and the network delay of nanosecond can be calculated, while alleviating CPU burdens, improve calculating
Precision.
The technology contents and technical characteristic of the present invention have revealed that as above, however those skilled in the art still may base
Make various replacements and modification without departing substantially from spirit of that invention, therefore, the scope of the present invention in teachings of the present invention and announcement
It should be not limited to the revealed content of embodiment, and should include various replacements and modification without departing substantially from the present invention, and be this patent Shen
Please claim covered.
Claims (10)
1. a kind of latency test method, which is characterized in that include the following steps：
S1, carries out parameter configuration in local terminal switching equipment, and the parameter includes message sending cycle Interval, timestamp
Beginning position Offset, packet counting Count, and message Received whether is received, while being configured in remote switching
Identical timestamp initial position Offset；
S2, when message sending cycle reaches, local terminal switching equipment judges whether to receive whether message Received is 1, if so,
Step S3 is directly executed, otherwise, after calculating two-way real-time time delay and two-way average delay, executes step S3；
S3, packet counting Count values add 1, and current time stamp and current message are counted in Count values deposit message, send
Message Received whether will be received after message to remote switching is set to 0；
The timestamp for receiving message and the timestamp for sending message are stored in message and are sent to local terminal by S4, remote switching
Switching equipment；
S5, local terminal switching equipment judge that packet counting Count values are with packet counting Count values in local terminal switching equipment in message
It is no consistent, if so, it is 1 that whether configuration, which receives message Received, while two-way real-time time delay and two-way average delay are calculated,
Further execute step S2~S5.
2. according to the method described in claim 1, it is characterized in that, step S1 further includes being configured to deposit in local terminal switching equipment
Storage sends the caching Buff of message.
3. according to the method described in claim 1, it is characterized in that, in message since the Offset of timestamp initial position successively
It stores local terminal switching equipment and sends the timestamp of message, the timestamp of remote switching reception message and remote switching hair
Deliver newspaper text timestamp.
4. according to the method described in claim 1, it is characterized in that, in step S2, the two-way real-time time delay and two-way average
Time delay is calculated according to following formula：
Delay_L=Interval/2；Delay_R=Interval/2；
Average_L=Total_L/Count, Total_L=Total_L+Delay_L；
Average_R=Total_R/Count, Total_R=Total_R+Delay_R；
Wherein, Delay_L be local terminal switching equipment to the real-time time delay of remote switching, Delay_R remote switchings are extremely
The real-time time delay of local terminal switching equipment, Average_L are average delay of the local terminal switching equipment to remote switching,
Average_R is average delay of the remote switching to local terminal switching equipment, and Total_L is that local terminal switching equipment is handed over to distal end
The accumulated delay of exchange device, Total_R are accumulated delay of the remote switching to local terminal switching equipment.
5. according to the method described in claim 1, it is characterized in that, in step s 5, two-way real-time time delay and two-way mean time
Prolong and is calculated according to following formula：
Delay_L=R_RX_TS-L_TX_TS；Delay_R=L_RX_TS-R_TX_TS；
Average_L=Total_L/Count, Total_L=Total_L+Delay_L；
Average_R=Total_R/Count, Total_R=Total_R+Delay_R；
Wherein, Delay_L be local terminal switching equipment to the real-time time delay of remote switching, Delay_R is remote switching
To the real-time time delay of local terminal switching equipment, Average_L is average delay of the local terminal switching equipment to remote switching,
Average_R is average delay of the remote switching to local terminal switching equipment, and R_RX_TS is that remote switching receives message
Timestamp, L_TX_TS be local terminal switching equipment send message timestamp, L_RX_TS be local terminal switching equipment receive message
Timestamp, R_TX_TS be remote switching send message timestamp, Total_L be local terminal switching equipment to distal end friendship
The accumulated delay of exchange device, Total_R are accumulated delay of the remote switching to local terminal switching equipment.
6. a kind of latency test device, which is characterized in that including
Initiation parameter configuration module, for carrying out parameter configuration in local terminal switching equipment, the parameter includes that message sends week
Phase Interval, timestamp initial position Offset, packet counting Count, and message Received whether is received, while
Identical timestamp initial position Offset is configured in remote switching；
First judgment module receives whether message Received is 1 for judging whether when message sending cycle reaches；
Second judgment module, for judging packet counting Count values and packet counting Count values in local terminal switching equipment in message
It is whether consistent；
First message processing module (MPM) for packet counting Count values to be added 1, and current time stamp and current message is counted
Count values are stored in message, and whether will receive message Received after transmission message to remote switching is set to 0；
Second message processing module (MPM), the timestamp deposit of timestamp and transmission message for remote switching to be received to message
In message and it is sent to local terminal switching equipment；And
The first time-delay calculation module and the second time-delay calculation module for calculating two-way real-time time delay and two-way average delay.
7. device according to claim 6, which is characterized in that the initiation parameter module is also matched in local terminal switching equipment
Set the caching Buff for stored messages.
8. device according to claim 6, which is characterized in that in message since the Offset of timestamp initial position successively
It stores local terminal switching equipment and sends the timestamp of message, the timestamp of remote switching reception message and remote switching hair
Deliver newspaper text timestamp.
9. device according to claim 6, which is characterized in that the first time-delay calculation module is calculated according to following formula
Two-way real-time time delay and two-way average delay
Delay_L=Interval/2；Delay_R=Interval/2；
Average_L=Total_L/Count, Total_L=Total_L+Delay_L；
Average_R=Total_R/Count, Total_R=Total_R+Delay_R；
Wherein, Delay_L be local terminal switching equipment to the real-time time delay of remote switching, Delay_R remote switchings are extremely
The real-time time delay of local terminal switching equipment, Average_L are average delay of the local terminal switching equipment to remote switching,
Average_R is average delay of the remote switching to local terminal switching equipment, and Total_L is that local terminal switching equipment is handed over to distal end
The accumulated delay of exchange device, Total_R are accumulated delay of the remote switching to local terminal switching equipment.
10. device according to claim 6, which is characterized in that whether the second time-delay calculation module will receive message
Received is configured to 1, and calculates two-way real-time time delay and two-way average delay according to following formula：
Delay_L=R_RX_TS-L_TX_TS；Delay_R=L_RX_TS-R_TX_TS；
Average_L=Total_L/Count, Total_L=Total_L+Delay_L；
Average_R=Total_R/Count, Total_R=Total_R+Delay_R；
Wherein, Delay_L be local terminal switching equipment to the real-time time delay of remote switching, Delay_R is remote switching
To the real-time time delay of local terminal switching equipment, Average_L is average delay of the local terminal switching equipment to remote switching,
Average_R is average delay of the remote switching to local terminal switching equipment, and R_RX_TS is that remote switching receives message
Timestamp, L_TX_TS be local terminal switching equipment send message timestamp, L_RX_TS be local terminal switching equipment receive message
Timestamp, R_TX_TS be remote switching send message timestamp, Total_L be local terminal switching equipment to distal end friendship
The accumulated delay of exchange device, Total_R are accumulated delay of the remote switching to local terminal switching equipment.
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