Questions about MultiCast Rate

1. What is MultiCast Rate?
2. The default is 2 Mbps, isn't it? Is it country dependent?
3. How to choose among the 1, 2, 5.5, and 11 Mbps options available?
4. Can the choice affect the interference with other devices?

1. What is MultiCast Rate?
The Multicast Rate option sets the threshold throughput level a wireless client must obtain in order to be "accepted" by the base station. The lower this value, theoretically, the greater number of clients that can connect, especially those at greater distances from the base station. At the opposite end, the higher this number, only those wireless clients that can achieve the higher throughput value will be able to connect.
Every client negotiates bandwidth individually. Regardless of what the multicast rate is set to, the clients are going to be using the highest data rate their connection to the base station is capable of. Therefore the clients close to the base station will be using a high data rate while the clients far from the base station will be using a lower data rate. If the data rate to any client falls below the multicast rate, that connection will be dropped.
2. The default is 2 Mbps, isn't it? Is it country dependent?
That would depend on the firmware version that is running on the AirPort. For example, on the simultaneous dual-band AirPort Extreme, this option only provides for Low, Medium, or High settings. It is NOT country dependent.
3. How to choose among the 1, 2, 5.5, and 11 Mbps options available?
You would use the AirPort Utility to select the MultiCast Rate from the Wireless Network Options panel.
4. Can the choice affect the interference with other devices?
No. This setting is totally different than the radio channel setting. Having two base stations near each other, that are operating on the same channel, will cause Wi-Fi interference between them.

Similar Messages

Basic questions about Exchange Rate Differences

Hi Experts?
I have few questions about exchange rates:
1. Currently in 2007, under what circumstances are exchange rate differences not posted automatically? In the previous version, it was this case when invoices are linked to payment, and manual exchage rate differences had to be run.
2. What are unrealized exchange rates? and When do unrealized exchange rates occurs?
3. In account oo logical pinciples, why is there a need to auto reverse Exchange rate differences or Conversion rate differences during the opening of a new posting period??
Much Thanks!
Warmest Regards,
Chinho

Hi Chinho,
you may find useful info in this wiki:
[How does SAP Business One deal with Realised and Unrealised Exchange Rate Differences? |https://wiki.sdn.sap.com/wiki/pages/viewpage.action?pageId=60654139]
& also these 2 EES:
[Exchange Rate Differences|https://psd.sap-ag.de/PEC/calendar/html/recording.php?hck=7a4f07ef7ac81ec31e04d55faffe33bdde93ec2398c338760e0d98adab7ba5acf2c39b2da1782f45e8a5a4d337dedcc647afebddd531782af42bafae98ce7ed5]
[Exchange Rate|https://psd.sap-ag.de/PEC/calendar/html/recording.php?hck=e5397f14c44f8df754617194051dab1ad38f59f08580406c2efd59aa4c0f71616713c2abe76bc503e08f2f5eda4863634f6fe99ad39d46c947c09623b91e53ca]
As a rule, in version 2007 it's the unrealised exchange rate differences on the BP side that are relevant since with the introduction of the unified internal reconciliation engine realised partial exchange rate differences are automatically posted. You also use the functionality to post exchange rate differences for FC GL accounts at a particular execution day.
All the best,
Kerstin

I have a question about Data Rates.

Hello All.
This is a bit of a noob question I'm sure. I don't think I really understand Data Rates and how it applies to Motion... therefore I'm not even sure what kind of questions to ask. I've been reading up online and thought I would ask some questions here. Thanks to all in advance.
I've never really worried about Data Rates until now. I am creating an Apple Motion piece with about 15 different video clips in it. And 1/2 of them have alpha channels.
What exactly is Data Rate? Is it the rate in which video clip data is read (in bits/second) from the Disc and placed into my screen? In Motion- is the Data Rate for video only? What if the clip has audio? If a HDD is simply a plastic disc with a dye read by "1" laser... how come my computer can pull "2" files off the disc at the same time? Is that what data transfer is all about? Is that were RAM comes into play?
I have crunched my clips as much as I can. They are short clips (10-15seconds each). I've compressed them with the Animation codec to preserve the Alpha channel and sized them proportionally smaller (320x240). This dropped their data rate significantly. I've also taken out any audio that was associated with them.
Is data rate what is slowing my system down?
The data rates are all under 2MBs. Some are as low as 230Kbs. They were MUCH higher. However, my animation still plays VERY slowly.
I'm running a 3GigRam Powerbook Pro 2.33GHz.
I store all my media on a 1TB GRaid Firewire 800 drive. However for portability I'm using a USB 2 smartdisk external drive. I think the speed is 5200rpm.
I'm guessing this all plays into the speed at which motion can function.
If I total my data rate transfer I get somewhere in the vicinity of 11MBs/second. Is that what motion needs for it to play smoothly a 11MBs/second data connection? USB 2.0 is like what 480Mbs/second. So there is no way it's going to play quickly. What if I played it from my hard drive? What is the data rate of my internal HDD?
I guess my overall question is.
#1. Is my thinking correct on all of these topics? Do my bits, bytes and megs make sense. Is my thought process correct?
#2. Barring getting a new machine or buying new hardware. What can I do to speed up this workflow? Working with 15 different video clips is bogging Motion down and becoming frustrating to work with. Even if only 3-4 of the clips are up at a time it bogs things down. Especially if I throw on a glow effect or something.
Any help is greatly appreciated.
-Fraky

Data rate DOES make a difference, but I'd say your real problem has more to do with the fact that you're working on a Powerbook. Motion's real time capabilities derive from the capability of the video card. Not the processor. Some cards do better than others, but laptops are not even recommended for running Motion.
To improve your workflow on a laptop will be limited, but there are a few things that you can try.
Make sure that thumbnails and previews are turned off.
Make sure that you are operating in Draft Mode.
Lower the display resolution to half, or quarter.
Don't expect to be getting real time playback. Treat it more like After Effects.
Compressing your clips into smaller Animations does help because it lowers the data rate, but you're still dealing with the animation codec which is a high data rate codec. Unfortunately, it sounds necessary in your case because you're dealing with alpha channels.
The data rate comes into play with your setup trying to play through your USB drive. USB drives are never recommended for editing or Motion work. Their throughput is not consistent enough for video work. a small FW drive would be better, though your real problem as I said is the Powerbook.
If you must work on the powerbook, then don't expect real-time playback. Instead, build your animation, step through it, and do RAM previews to view sections in real time.
I hope this helps.
Andy

A question about Frame Rate in FCPX and Motion 5

I use a Canon Legria HV40 shooting at a frame rate of 25fps
Is it essential to set the frame rate in Final Cut Pro X and Motion 5 to 25fps as well?
The reason I'm asking this is that I recently put together a series of clips shot with the HV40 in a FCPX project with the default settings of 60fps and it didn't seem to matter - everything worked as expected..

FCPX automatically 'confirms' any clip rate to the Projects settings.
But ... more rendering to do (=time), 'un-eveness' could lead to blur/quality loss (=how do you divide 25 frames over 60 equally?) ...
Best practice is: cam, project, delivery = same frame-rate.
Exception: for nice slow-mo: HFR on cam, low fps on Project ....

Question about frame rates in Flash

If I create a Flash animation using 12 frames per second set in the Flash properties and I then export the timeline as a quicktime movie at PAL settings (25 frames per second) so that I can use it in a Premiere Pro timeline with other PAL video clips shot with a camcorder, does that affect the speed at which the original Flash timeline will play when converted to a quicktime movie?
I don't want to have to animate the Flash clip at 25 frames per second in Flash because it requires about twice as much drawing, but I also want to preserve whatever sense of action timing there is in the Flash action and not have it play too fast or too slow when incorporated into a video project.
Thanks for any advice on how best to do this.

For what you show so far, you can probably create it all in Flash without concern for slicing and whatnot.. For starters....
First create the buttons... select Insert -> New Symbol -> Button. Buttons have 3 visual frames... one for Up, one for Over, and one for Down. The 4th frame is useful for defining a larger Hit area for small items. So create a new button symbol and draw the different views you want for the button. When you are done you should be able to make the button work visually without the need for any code. You will want to add code to control the feature displays.

Question about sample rate and PXI 5122

Hello! i am new at using labview and pxi cards. i am trying to sample a signal from an analog gennerator with pxi-5122 so afterwards i can process the samples and extract the processed samples to an oscilloscope through pxi-5421. i tried to use the labview examples for pxi-5122 for sampling and processing( more precisely the example "digital filtering"). They are working perfectly for high sample rates (some MHzs), but when i try to sample low frequency signals (for example 20kHz) and use sample rate according to Nyquist criterion, the acquired samples dont reconstruct the initial signal at all. if you have experienced similar problems, how can i sample low frequency signals with sample rates according to Nyquist criterion?

Nyquist criterion says: "sampling freq. should be at least twice the max. feq. component in the signal". For better reconstruction you should keep the sampling rate to some 8-10 times of max freq. component in the signal.
I am not allergic to Kudos, in fact I love Kudos.
Make your LabVIEW experience more CONVENIENT.

Questions about Real Application Testing(RAT)

Hi All,
We have a production database running on 10gR3 on a server with local drives, while we have a Oracle 11gR2 DB running on a server with NFS mounts (using S7310 - AmberRoad) i.e. Faster and better storage.
We captured the load on 10gR3 and replayed it on 11gR2. We noticed the following:
(1) Replay is considerably slow even though Oracle11gR2 instance has a faster storage. We suspect that it may be something to do with the buffer cache / SGA because there is nothing in cache on the target (we didn't shutdown 10gR2 DB for capture) – what should we do then?
(2) To make sure that we can take the advantage of cache, we replayed the load 2nd time right after the 1st replay and everything ran to our surprise. So we are wondering how’s that possible since we did not restore the DB as we do not want to wipe off the cache (chicken and egg situation)? Does Oracle rollback the changes after the replay?
(3) Do we have to restore database on Target every time we do replay? But if we do that then we won't have anything in the SGA.
So we need your advise and also would like to know how everyone else is doing this testing?
Regards,
RJiv.

DB Replay's workload capture facility allows you to either start capture from a closed (mounted) database (capture starts upon opening the DB), or to begin capture mid-stream during normal activity. Starting capture on the production system from a closed database eliminates the divergence in performance resulting from a primed cache, as well as possible data divergence issues from open, partially-completed transactions at the time the capture started.
For many customers, it will clearly not be possible to close their database during peak periods (!!)
One way to address the cache priming issue is to start capture in production from a closed state during a low period of activity, and the allow capture to run through the peak period.
Another approach is to start capture mid-stream with the DB open and to run capture for a long period (long enough to stabilize the cache). When performing the replay, begin a new AWR snapshot after the cache has stabilized.
Your question about running the replay again after the first replay is done is confusing. Of course you will not get meaningful data from that, since replay must begin from the capture start SCN. If you run replay twice in a row without reverting the database to the capture start SCN, it will be applying meaningless changes to a database in a state that is unlike that of the original. You will be testing the data errors codepath instead of real performance.
It is typical to enable database flashback on the repay database so that it can be repeatedly reverted to the capture start SCN for testing under a variety of scenarios.
Regards,
Jeremiah Wilton
Blue Gecko, Inc.
http://www.bluegecko.net

Airport Extreme multicast rate and closed network

New to Airport Extreme.
Is the multicast rate the same as the TX rate on other routers? I chose 11Mbps during the setup and my Macbook was very slow. I moved it back to 2 Mbps and it sped up. Distance from macbook to airport approx. 24 inches.
Other question/ statement. I assume that the closed network portion of the setup is the same as turning off the SSID of other routers. Do I assume correctly?

goldengti, Welcome to the discussion area!
Is the multicast rate the same as the TX rate on other routers?
Sorry I don't know about other routers. The multicast rate defines the minimum data rate the base station will use and maintain the wireless connection. If you set it to 11 Mbps, the wireless connection will be broken if that data rate can't be maintained.
Other question/ statement. I assume that the closed network portion of the setup is the same as turning off the SSID of other routers. Do I assume correctly?
Yes the same useless option. Regardless of how you set this option on any router, the SSID is still broadcast between any connected clients and the base station. Therefore it only takes a few seconds to discover the SSID.

Deploymentshare : local or DFS? What is best for performance and failures? And what about multicast in relation to DFS?

Hi,
we use MDT 2013 on MS Server 2012 Standard. We deploy LTI's. We have only one (virtual) MDT-server and that has only one deploymentshare. I'm having now a discussion with my colleague about where to put the deploymentshare. He says that we should put it
on our fileservers (which use DFS) because it's more safe and more dynamic (no idea what he means with that). But to me it appears quite strange to separate an application and its main folder structure. I have this idea that those two need to be as close
as possible, like to avoid network problems for instance. It's also a fact that our MDT-server is backed up every night, so if something bad happens we just ask our colleagues to restore the latest snapshot. Can someone explain which option is the better and
why : local or DFS?
Second thing which is related to my first question: I've read on this forum about multicast not being possible when the deploymentshare is not local on the server? Am I correct? Anymore info about this issue would be nice too. Awaiting your answers I'll
keep looking for more clues everywhere.
thanks,
Paul

IN addition to what is mentioned here.
MDT works great with DFS. However note that MDT is *NOT* supported with Domain DFS, only stand-alone DFS, because Domain DFS implies that the client is joined to a domain when you make the call, and MDT needs to run within WinPE, where there is no domain
infrastructure.
Multicast should be on the same machine as your DeploymentShare, wherever that may be. If you have DFS, your deployment share would be the root.
Another idea is to use DFS to replicate out to your DFS leaf nodes, and each Leaf node would be it's own WDS Server with Multicasting being done from there.
Keith Garner - Principal Consultant [owner] -
http://DeploymentLive.com

Question about tranferring data from iPhone 3gs to iPhone 4

I just had a couple quick questions about transferring data from my old phone from my new iPhone 4. The reason i am wondering is because i am worried about whether i will encounter any problems when doing so.
First off i have already sold my phone today, i reset all data and settings from the phone and gave it to my buddy so its gone. I did a full sync and backup yesterday so all the necessary files should be on my computer(windows 7). Now, im basically wondering if i will run into any problems if i restore my iphone 4 from a backup. My 3gs was running 3.1.2 on att. Now i know IDEALLY i would have updated it to iOS 4 before backing it up and used the newest version of itunes, but i did not. Does anyone think this will be a problem for me?
Now with that out of the way, my biggest fear is losing my old data(text messages and notes mainly because i am a pack rat for those type of things) so id like to be SURE that none of my old backups will be deleted in any scenario. The reason i dont just restore it right now is because i want my new phone to be as clutter free as possible. I am going to be putting on here only the apps that i used often and would basically like to transfer over the BARE minimum; texts, notes, and highly used apps... So i guess my main question is can you transfer over only certain things like texts and notes after setting up the phone as a new phone. And if i were to set up the phone as a new phone what would happen to my old backups? Would i be able to selectively restore?
Im afraid that it might not be a possibility to transfer only certain things even though it should be.. i should be able to select a text messages folder and put it on my new phone and be done with it... But anyway i dont want to rant. Can anyone explain to me how this all will work?
ULTIMATE GOAL: Transfer only texts, notes, certain apps(and their data) and NOTHING ELSE.
MOST IMPORTANT THING: Not losing texts and notes. I can deal with putting all the old **** on my new phone and cluttering/slowing it down if i NEED to.
Thank you in advance, sorry for the long post.

If the most important thing for you is keeping old text messages, notes, and voicemail, then you'll need to sync the phone from your existing backup. I know of no other way to access those items.
Once you have synced to the new phone, check that you have those items that were important. Then you can reconnect your phone to iTunes, and change the sync settings to remove the apps or other items you no longer want to keep on the phone.
iPhone backups are stored by iTunes; you can see them by opening your iTunes preferences, clicking on "Devices" and then looking in the window. You can delete old backups from here. I don't know how you can open/read the backups though.
I don't expect you'd have any problems syncing from your old phone's backup, but it's definitely an either/or situation. Since you got rid of the old phone already, it's too late to email yourself your notes, or copy the text messages. Your previous backup is your only solution.

Question About Photo Printers

Excuse me for asking a question about photo printers here, but I could not find a place in the Apple Discussions form for printers.
I'm thinking about buying an Epson R1900 printer since my primary selection criteria is the quality of glossy photographs.
However, I have been told that use of the R1900 for general purposes (with a "standard" printer setting and non-photo paper) will detract from the R1900's performance when it will be used for printing photos (with photo RPM printer settings on premium photo paper or other media). But I just do not know whether this is correct. I was planning to have only one printer and expecting to use the photo printer as my "general purpose" printer (text, documents etc.).
I would appreciate receiving advice/guidance from people who know about printers and/or people having with experience with the Epson R1900.
Thanks for your help.

I use my photo printer in two ways.
For high quality prints I use the manufacturers Glossy paper and their expensive archival Quality inks for excellent results. More commonly though, I change out those ink cartridges and replace them with a cheaper water soluble ink bought online and use normal A4 copy paper for printing web pages and PDF documents.
This second practice is about 60% cheaper in ink and copy paper is only about 1 cent per sheet and is satisfactory for such documents.
The disadvantage is that is does require physically replacing one set of ink cartridges for the other, also if moving from basic to quality, I also do the inkhead alignment tests and adjustments to ensure that the output for glossy photos is going to be first rate.
I find this necessary to prevent waste of good pigments, yet it still allows the printer to be used for more mundane usage of printing documents. The cost of printers is heavily discounted, as the manufacturers recoup their cost from the sale of ink. Hence one needs to have this dual usage in place to get the best of both worlds.
This advice is not specific to one model photo printer, rather it is a general approach developed after spending too much money on good ink, printing web pages.

I want to ask the question about phasor measurement.

I want to ask the question about phasor measurement.the first one is that how can I accomplish the sychronized sampling with GPS?The other question is that how can I adjust the sampling rate for DAQ when the system frequency alter continuously.(if I used the DFT,due to the altering of frequency,I can't get the completed waveform)"

Synchronising DAQ with GPS depends on the DAQ sampling rate. If the rate is higher than 2 Hz you can sample the 1PPS pulse of your GPS receiver together with your data.
You change the sampling rate with the AI Clock Config.vi. You cannot do this on the fly so you must stop DAQ with AI Control.vi reconfigure the sampling rate and then start it again.
Waldemar
Waldemar
Using 7.1.1, 8.5.1, 8.6.1, 2009 on XP and RT
Don't forget to give Kudos to good answers and/or questions

Question about ports

Hi,
I have a clarification question about ports and Java. Assuming all firewalls are disabled on a PC, a Java application can connect to any port via a socket to communicate with other PCs, as long as this port is not used by another application.
Is the following correct:
a) Two applications (Java or no) cannot connect to the same port together, ever.
b) Two Java applications sending and receiving datagram over a given multicast address using the same port can never communicate with each other when ran on the same PC because of a).
Thanks,
J.

Jrm wrote:
Hi,
I have a clarification question about ports and Java. Assuming all firewalls are disabled on a PC, a Java application can connect to any port via a socket to communicate with other PCs, as long as this port is not used by another application.You mean bind to a port to act as a server? Yes. As long as that port is not already bound for listening.
If you mean a client application can connect to any port where a server is listening, then it doesn't matter if another client is talking to the server on that port, as long as the server is written to handle concurrent connections.
>
Is the following correct:
a) Two applications (Java or no) cannot connect to the same port together, ever. No, see above. Unless by "connect" you mean "bind". (Even that may be incorrect terminology.)
b) Two Java applications sending and receiving datagram over a given multicast address using the same port can never communicate with each other when ran on the same PC because of a).Not sure exactly what you're saying here.
Really, though, why not just write some code and try it?

Some basic questions about rmi registry context "bind" and "lookup"

We have more processing to do than can be accomplished with a single computer. To solve the problem I've implemented a distributed computing solution using RMI. (The first time I saw RMI was about 2 weeks ago, so please bear with me!)
The implementation is a proof of concept not a fully fleshed out system. I have one "Workunit Distributor" computer and any number of "Data Processor" computers all on the same lan segment. "Workunit Distributor" and "Data Processor" computers are both RMI client and server to each other. The "Data Processor" computers are given the ip address and name of the "Data Distributor" on the commandline when they start. They communicate their willingness to receive and process a workunit to the ""Workunit Distributor" via a RMI call. Work units are sent to available "DataProcessors" and results are eventually returned to the "WorkunitDistributor" (minutes or hours later). The model program works quite well, and appears to be capable of doing the processing we need to get done.
But now that it seems viable, I've been asked to make it a little more scalable, flexible and self configuring. In particular, instead of one "Workunit Distributor", any number of "Workunit Distributors" should be allowed to show up or disappear from the lan at any time and the system should continue to function. I've worked out a good scheme for how this can be done, but I have a couple of questions about the RMI registry (registries?). I'm trying to keep from implementing some functionality that may already be available as a library or subsystem.
With my current model design, each computer binds to its own registry with a unique name. For instance:
CRDataProcessorImpl crdpi = new CRDataProcessorImpl(svr);
Context crDataProcessingContext = new InitialContext();
crDataProcessingContext.bind("rmi:"+hostName, crdpi);
Currently the "Data Processors" get the info they need for a Context lookup() of the one and only "Workunit Distributor" from the commandline. And the info the "Workunit Distributor" needs to do a Context lookup() of a "DataProcessor" is passed to it from each "DataProcessor" via a RMI call.
But in the newer (yet to be implemented) scheme where any and all "Workunit Distributors" show up and disappear whenever they feel like, the naming bootstrapping scheme described above won't work.
I can imagine a few ways of solving this problem. For instance, having "Workunit Distributors" multicast their contact information on the lan and have a worker thread on each "Data Processor" keep track of the naming information that was multicast. Another alternative (more organized, but more complex) might be to have a dedicated host with a "well known" address and port that "Workunit Distributors" and "Data Processors" could all go to, to register or look up at an application level. Sort of a "domain name service" for RMI. But both these schemes look like a lot of work to implement , debug and maintain.
The BEST thing would be if there was one plain vanilla RMI registry that was usable by all RMI enabled computers instead of having each computer have its own local name registry. In volume 2 of the Core Java2 book it says that every registry must be local. I'm only hoping there's been progress since the book was published and now a central rmi registry is available.
If you have any ideas about this I'd like to hear what you know.
Thanks in advance for any advice.
Lenny Wintfeld
ps - I don't believe web services, as full featured as it is, is a useful alternative. I'm moving 100's (in the future possibly 1000's) of megabytes back an forth for processing.

The local bind/rebind/unbind restriction is still there and it will always be there.
I would look at
(a) RMI/IIOP, where you use COSNaming as a registry, which doesn't have that registriction, and which also has location-independent object identifiers
(b) Jini.

Quick (and urgent) Question about Intel G5's

Just a quick question about the new intel G5's.
I currently have bunch of software for my PPC G5 which is a Dual 2ghz. Software includes Adobe CS2, Macromedia Studio, Quark 6, etc, etc.
If I purchase the new intel mac, would I be able to use the same software? or would I be forced to purchase a whole new set of everything I currently have?
If the software will work on the intel G5, would it perform at the same rate/better than how it performs now on my PPC g5?
Thanks in advance for any help.

Rosetta:
Most of the time you get a real 'hit' when a program first opens that is PPC. Very sluggish. They will require and use more memory than otherwise, too.
Tests from last August aren't as helpful, there have been improvements, letting the Mac Pro pull even further ahead.
http://www.barefeats.com/quad06.html
Comparison Mac Models shows scores of all models. So there is 2x as much or more processing power, bandwidth, better video, as well as disk drives. A 'base' configuration would be 4-6GB RAM.
And there are differences, more than between G4 and G5.
People with experience would be Mac Pro Discussions
Don't use Migration Assistant, and upgrade to CS3 etc. reinstall all your applications fresh.
There are some drivers and plug-ins, that can be problems, and known.
Mac Pro 2GHz 4GB 10K Raptor RAID Cinema HD Mac OS X (10.4.9) WD RE RAID Aaxeon FW800 PCIe MDD-G4 APC RS1500 Vista

Questions about MultiCast Rate

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