Calculating Round Trip Time from Non-Spatial Log Data

Hi,
I have a log table which holds the vehicles' "entrance" an "exit" dates (dd.mm.yyyy) to/from regions like that:
VEHICLE_ID REGION IN_TIME OUT_TIME
1001 CUST_A 01.01.2007 03.01.2007
1001 CUST_B 05.01.2007 06.01.2007
1002 CUST_C 04.01.2007 06.01.2007
1001 BASE_A 08.01.2007 11.01.2007
1002 CUST_D 11.01.2007 12.01.2007
1001 CUST_A 15.01.2007 15.01.2007
1001 CUST_F 18.01.2007 19.01.2007
1001 CUST_A 19.01.2007 20.01.2007
1002 CUST_E 16.01.2007 19.01.2007
in fact, this table was created for reporting "average wait time on each customer" but then i calculated "round trip time" by assigning "base region" ( vehicle round trip starts from "base region" then comes back to here, etc.. ) and creating some rules like "if it passes from CUST_A and CUST_D, it is 'ROUND TRIP A'"..
vehicles' voyage report is like that :
TRIP STARTDATE ENDDATE
TRIP_A 01.01.2007 13.01.2007
UNDEFINED 13.01.2007 16.01.2007
TRIP_B 16.01.2007 02.01.2007
now, trips are more complicated and i want to use spatial mechanism. any advise?
thanks,
Cihan.

Stephen Rodriguez wrote:You don't need to worry about the round trip between the AP and WLC. Just make sure the phone to phone is goodHTH,
Steve
Please remember to rate useful posts, and mark questions as answered
Thanks Steve,
That makes Sense, as post authentication the phone to phone would be ofcourse less than 150ms when the traffic is locally switched.
But I dont understand why the recommendation in the D&D guide "Roundtrip latency must not exceed 300 milliseconds (ms) for data and 100 ms for voice and data between the access point and the controller"
I think it is applicable if the traffic is centrally switched?? or is there more to it, for roaming perhaps?
Thanks
Jino

Similar Messages

Calculating Round Trip Time

Hi Everyone,
I have tried using Network Monitor and Memory Monitor in WTK but I m not sure as to how I should analyze the results or where is the time located ? I did see time taken from getting 0 to 6244(image size) bytes. is that RTT ?
Please advise.

This post has been moved from the Servers' General Discussion forum to the Solaris 10 forum.
You do not have a question specific to a hardware component of a Sun/Oracle branded server.
You seem to have a general software question that could apply regardless the brand of the computer system.
Perhaps you can review the man pages for ping, traceroute, and arp and combine them into what you hope to find. There may be yet other Solaris commands you can use, based upon what you read in their man pages.

RTT Round trip time ?

Hi team,
Have few doubts on round trip time of PING utility.
Actually am not sure how RTT is calculated. i mean min/avg/max values. is there any algorithm available ? please share if any RFC available ?
i know RTT is delay between source and destination ack. i am not sure how MIN/AVG/MAX calculated.
please help me on this.
thanks
rajesh kumar V

Disclaimer
The Author of this posting offers the information contained within this posting without consideration and with the reader's understanding that there's no implied or expressed suitability or fitness for any purpose. Information provided is for informational purposes only and should not be construed as rendering professional advice of any kind. Usage of this posting's information is solely at reader's own risk.
Liability Disclaimer
In no event shall Author be liable for any damages whatsoever (including, without limitation, damages for loss of use, data or profit) arising out of the use or inability to use the posting's information even if Author has been advised of the possibility of such damage.
Posting
RTT is figured by the sender recording when it sends the ping request and subtracts that from the time when it gets the ping reply. I.e. the delta is the RTT.
Receivers might be slow to process a ping request, so the latency isn't always just network time, it often includes the receiver's processing latency.
(NB: For Cisco's SLA "ping", the receiver immediately records when ping request is received and this usually allows the receiver's processing latency to be eliminated - providing a much more accurate network latency value.)
If you send more than one ping, in a series, the min the is the best/least time, max is the worse/highest time, and avg is the average of the series.
e.g.
If you sent 3 pings and their times were 2,2,2, min/avg/max would be 2/2/2.
If you sent 3 pings and their times were 3,1,2, min/avg/max would be 1/2/3.

Response times, interpretation times and round trips time

Hi
Can some body explain me what these terms means exactly ? What is their significance ? Appreciate answers without help links.
thanks
kumar

Hai,
Interpretation times: This is the duration from the time that user input actions are validated in the SAP GUI client and the moment the request is actually sent to the SAP application server. This measures the health of the SAP GUI client used for the test rather than the performance of the SAP R/3 server.
Check SAP Note: 364625.
Response Time: The response time of a transaction step is the difference in time between the point when the request arrives in the R/3 System and the point when the R/3 System completes the processing.
Check SAP Note: 8963 and 851012.
Round trip times: Is almost same as the response time. Time from client - LAN - Server and back to the client is known as Round trip time.
Regards,
Yoganand.V

Round trip time is more with wireless phone SSID

Hi,
We have separate SSID for data and voip in our wireless network.
I have connected my laptop to wi-phone SSID and gave a ping to other laptop IP on same SSID. The round trip time is around 707ms. Sometimes it is reaching more than 1000 ms.
When i connect to my data SSID, the round trip time is very very less around 3 tp 4 ms.
When I try to ping to a phone which is on call, the round trip time is around 50 ms.
Please suggest on how to resolve this issue. Please let me know, if any configuration related information is required.
Regards,
Madhan kumar G

it could be due to power-save enabled on those laptops. Disable it and try.
disable/enable wmm on laptop and try.
Try pinging the phone at off call you may experience high RTT when it is not on call.
ping on WLC is handled as best effort. try file transfer or iperf/jperf.
what's the client(s) rssi and snr when you test.
If the above didn't help check config between the WLANs in question.

Long HTTP Request/Response round trip time on new Azure Websites under BizSpark Plus

Hi,
I have a very difficult situation. I am busy migrating from a traditional VM architecture to Azure Websites. This is after a few months of testing and being happy that Azure Websites can provide the performance necessary for our application. The TEST site
I set up is running great and meets all the performance requirements. The TEST site is set up under my normal BizSpark subscription.
We have since been awarded a BizSpark Plus subscription and I have started the migration process on this subscription, as opposed to the normal BizSpark basic subscription.
However, since starting our migration process, I am experiencing huge latency on the HTTP request roundtrip from browser to server and back for my newly created LIVE Azure Website instance. I have investigated and observed the statistics between the TEST
and LIVE instances. Here is a test run against the 2 environments on a particular screen of our application. Here are the times for the full roundtrip for each AJAX HTTP request of the specific actions:
TEST (Azure Website on BizSpark subscription):
GetAudioSource - 267ms
LogStartEvent - 196ms
LogProgress - 243ms
Retrieval of Audio file - 2.06s
LIVE (Azure Website on BizSpark Plus subscription):
GetAudioSource - 938ms
LogStartEvent - 3.61s
LogProgress - 5.11s
Retrieval of Audio file - 5.97s
There is clearly something wrong with the routing of the LIVE instance starting at the load balancer.
This is not the only place affected. In fact, all the HTTP requests are very lagged and delayed in the LIVE instance as opposed to hardly noticeable in the TEST instance.
I am wondering if there is a lower priority being afforded to my BizSpark Plus subscription running my LIVE instance, of if I am just unlucky with the underlying infrastructure that has been selected on my behalf. Or, is it possible that something can be
done to enhance and optimise the routing etc?
I also need to say that I have matched the Azure Website configuration and scale settings to be exactly the same between the 2 instances and have also set Always On to ON.
Any help or thoughts will be greatly appreciated, because I am starting to seriously doubt the service levels of the Azure Websites platform.
Thank you
Ozzy

Hello Ozzy Vox,
1. Which region(data center) do you have your websites deployed in?
Ideally there would be no change in terms of type of subsciptions when you deploy your website in production.
I suggest that you set up diagnostics on to your Azure websites to get the logs to understand where it is spending most of its time and the reason behind the latency.
You can refer to this link that will give you information on 'How to Monitor Websites':
http://azure.microsoft.com/en-in/documentation/articles/web-sites-monitor/
Also refer to this link regarding 'Enable diagnostic logging for Azure Websites':
http://azure.microsoft.com/en-in/documentation/articles/web-sites-enable-diagnostic-log/
Thanks,
Syed Irfan Hussain

Fuzzy video upon round trip export from motion to FCP

I'm using Motion 4 to add master template lower thirds to my FCP video. When I bring a clip from final cut into motion (send to>Motion) then send it back to FCP after I add my text, the video itself looks as if it has taken on a slight blurriness. I checked that my project settings were the exact same by going to project properties in motion and making sure everything matched up with my sequence settings in fcp. They did. Am I missing a step here? I'm tempted to not roundtrip through motion because of this. Instead I'd like to just open the master template in FCP and use that. The reason I don't is because I do not have control over font color and other adjustments.
Can anyone suggest a fix or point out what I'm doing wrong?
Thanks in advance.

See if this post helps:
http://discussions.apple.com/click.jspa?searchID=-1&messageID=13075996
Patrick

Wierd exclamation point message when round tripping back from Photoshop?

I have been using Photoshop CS3 for sharpening and other edits and have been hitting save (or just using a sharpening automation thing which saves the photo automatically) and I find that when I look at the new image in Lightroom it has an exclamation point, which when clicked says something like: "The metadata for this photo has been changed by another application. What would you like to do?" The options are "use disk metadata" "do nothing" or "overwrite" (I'm paraphrasing here).
First, does anyone know why I am getting this message? Second, what should I do when I get it? I've been selecting "overwrite" but I have no idea, really, what this whole dialog is about! Third, is there any way to NOT get this message?
Many thanks for your help!

Use Lr's help facility; it contains this entry:
Update photos changed by another application
In the Grid view, Lightroom displays alerts in image cells when the photos in your library have been changed by another application. For example, if a photo has a one star rating in Lightroom, and the photo has been updated to a two star rating in another application, you need to decide which rating to respect. Both cannot co-exist together. Lightroom lets you resolve conflicting photo metadata by either overwriting its data in the library with metadata from the photo or its sidecar XMP file, or overwriting the metadata in the photo file or sidecar XMP file with its stored data in the library database.
1. In the Grid view, double-click the alert icon in a cell.
2. In the Confirm dialog box, click one of the following:
Import Settings From Disk Imports the metadata from the photo or its sidecar XMP file, which overwrites the photos data in the library database.
Overwrite Settings Exports metadata from the library database to the photo file and overwrites the data in the photo or its sidecar XMP file.
Do Nothing Takes no action. If you select this option, be sure that the photos metadata in the library database doesnt conflict with data in the photo or its sidecar XMP file.

Calculating Daily Labour Count from P6 Resource Assignment data

Hello fellow P6 users,
If resources are assigned on activities in P6, and have also been leveled, what would be the best way to calculate daily labor presence on site? Currently I have used Excel to import resource assignment at activity level spread on an hourly timescale, and then processed this data to transform it into number of person on site for every work day of the project during its currency. The process is OK but laborious. Wonder how others do it, if at all.
I don't expect much response from P6 users as this is not a very common challenge in our industry but still hoping someone might have had enjoyed such experience to share here with us.
Thanks

Hello fellow P6 users,
If resources are assigned on activities in P6, and have also been leveled, what would be the best way to calculate daily labor presence on site? Currently I have used Excel to import resource assignment at activity level spread on an hourly timescale, and then processed this data to transform it into number of person on site for every work day of the project during its currency. The process is OK but laborious. Wonder how others do it, if at all.
I don't expect much response from P6 users as this is not a very common challenge in our industry but still hoping someone might have had enjoyed such experience to share here with us.
Thanks

Read data from STATIC internal table during round trip in DO_PREPARE_OUTPUT

Dear Gurus
I have a requirement where I need to select some data from the database table BUT_HIER_NODE_D.
After SELECTING this data to an internal table (say ITAB), I am displaying this data in a table view. I was able to achive this functionality by putting some code in the DO_PREPARE_OUTPUT method.
Now according to my requirement, after the above data has been displayed on the screen initially, the user will click on any row. After clicking on a particular row, I need to capture the document number on that particular row and need to display all its child document numbers in a separate table. I am able to achive this functionality also.
Initially I am not sure of how to READ the same internal table (ITAB) again and again by avoiding the SELECT query upon each round trip (between CRM and Web).
After some research, I understand that I might have to use STATIC internal table to store the data during the
initial SELECT. This way, upon each round trip, I can READ the data from the same internal table.
My question: But now, when I tried to create a STATIC internal table in DO_PREPARE_OUTPUT, it is not allowing me to declare this table because DO_PREPARE_OUTPUT method is a INSTANCE method.
I didn't find any STATIC methods in the IMPL class of the view.
I would really appreciate if somebody can help me on how to proceed further.
Thanks
Raj

Hi Bharathy / Adil / Masood
Thank you very much for the replies. I declared a static method inside the IMPL class and I was calling this method inside the DO_PREPARE_OUTPUT method. Looks like it is working fine for me...will comeback if I had any further issues.
Masood
As per my requirement, I need to Select the data into the internal table during the very first step, then I need to continuosly read the data from this internal table upon every round trip. So I am not sure if I would be able to use the method DO_INIT_CONTEXT. Because I need a method which will trigger upon each round trip and will also hold the data of this internal table. So right now, the only option for me is DO_PREPARE_OUTPUT method.
Plz let me know if am doing in the right way.
Thanks
Raj

Network Round Trips when loading a Form - reducing Network Latency

I am working on a Forms migration from Client-Server to WebForms running on Application Server 10.1.2.0.2
Does anyone know the minimum number of network round trips that can be achieved when loading a Form?
For most of the Forms in the migration I am seeing 3 network round-trips before the Form is displayed and on Forms that use Webutil I am seeing 7 round-trips before the Form is displayed. Is this normal or are there ways of optimizing the round-trips down?
The Forms code has already been optimized by removing SYNCHRONIZE commands and TIMER commands and I have already refered to metalink note 363285.1 which gives lots of good advice however there is no specific information on the minimum number of round trips that you can expect for loading a Form.
Thanks for any help you can give.
Philippe

Ok, a bit of an update is needed.
There were a number of posts below that have been lost due to an accidental deletion but I shall try and summarize them here:
Tony Garabedian - Posted a number of code optimizations that he'd used for speeding up code when querying within a Form. Tony if you are able to re-post those that would be great :-)
Grant Ronald - posted some more information in which he mentioned that the extra pings are used to synchronize between the App.Server and the client. He also commented that a network that uses satellite was inherently slower and would therefore require a different front end to handle the increase in latency.
For my part I said nothing new other than ask loads more questions. I did mistakenly comment that we are using satellite for our network however upon yet more discussion with our network guy it turns out that we're using optical cable for everything. Out guaranteed round trip time is about 320 milli-seconds to Australia from the UK.
Currently I am left with the understanding that we are not likely to go below 3 round trips for most of our Forms and in the case of Webutil we are likely to be limited to 7 round trips.
Of course if anyone out there has any specific experience with this issue and can comment further please feel free.
Many thanks,
Philippe

Why won't simple dissolves make the round trip back to FCP?

I have read in the Color manual and in certain places (here and the COW), that simple video transitions should be able to make the round trip back from Color to Final Cut Pro. I have a video that I prepped for Color, only it does contain a few cross dissolves. Everything is on one track, and the grading is done. I see my dissolves in the Color timeline. When I go back to FCP, however, they are gone. Obviously, with there being no handles on Color video, I can't add them later.
I understand that I could send the clips I want to perform dissolves on with handles over to color, grade them, and send them back and THEN make the dissolve, but this would be an elaborate waste of time. Is there a setting somewhere that I'm overlooking? Why, when all indications are that it will work, will it not work?
Any input would save me from re-doing this whole edit.
Thanks.
Stats: Running Final Cut Studio 2
            Mac Pro
            FCP version 7.0.3
            Color version 1.5.3
All clips involved in this edit were QT at MPEG-2 Video, Linear PCM, Timecode
Dimensions 1280x720
Let me know if you need more info.

Color doesn't work with MPEG-2 video. It works with FCP codecs... ProRes, DVCPRO HD, HDV, XDCAM. And only renders out as ProRes or Uncompressed. I've done over 100 onlines using Color, and every one of them kept the transitions intact. Every one. The fact that it isn't for you, means you are doing something wrong...and your codec is the obvious culprit.

**HOW DO I DELETE ONE CALL AT A TIME FROM MY IPHONE 4???**

Please help I can't delete one call at a time from my call log!!

Lol! I'm not cheating on anyone, never have... I just delete multiples of calls so my phone doesn't get too filled up.. But I'm also guessing now that I have an iPhone and not an htc I won't have a space issue. Thanks very much!!

When my macbook goes to sleep from non activity when I return the wifi is not on. When trying to log back onto my hub it says it is out of time and I have to reboot each time. Most annoying, any solutions please?

When my macbook goes to sleep from non activity when I return the wifi is not on. When trying to log back onto my hub it says it is out of time and I have to reboot each time. Most annoying, any solutions please?

If you are not using data and the iPhone goes to sleep, it will automatically drop the wi-fi, and will not reconnect until you wake the phone up. That is the way it is designed. The only way around that is to turn off cellular data while at home and on wi-fi.
Cannot answer the xbox question since this is an iPhone forum and I would have no idea.

Trouble with the round trip from Soundtrack Pro 2 to Final Cut Pro

I have edited a home movie together. I then have sent the sequence to Color for grading and then after completing the Color changes and Rendering. I sent it back to Final Cut Pro. It starts out working fine but during the transfer process it stops at somewhere between 50% and 60%. It is during the "Importing XML Data" phase. It just sits there and does not change and I have to force quit to get out of it. The exact same thing happens when I try to round trip from Soundtrack Pro 2 back to Final Cut Pro. So I am unable to make use of the changes I make in these programs.
This is a round trip process that I have successfully made many times before. Nothing has changed. I am working in Final Cut Studio 2 with the latest updates on an Intel Mac. Any advice on how to remedy this situation would be greatly appreciated.
Thank you in advance.

Make sure your easy setup has the correct frame rate for your sequence. Seems crazy but somehow or other fcp assigns a frame rate to audio files. I've found this can sometimes be tricky to get right. Here's what I've done to force the issue. Make sure the easy setup frame rate reflects that of the target sequence in fcp. Create a new project. import the audio in the new project. And then copy the clip from the new project to your main project.
Good luck

Calculating Round Trip Time from Non-Spatial Log Data

Similar Messages

Maybe you are looking for