Difference between signal strength and signal qual...

Does anyone know the difference between the two scores and what they measure - and why the levels change intermittantly. It's really affecting the quality of my tv picture.

The signal quality is actually a measure of the errors detected by the Vision box. Technically, the CBER in the advanced view is the "Corrected Bit Error Rate" measured as the number of bit errors per billion bits received (i.e. units are 1 x 10^-9). If you had 100 bad bits in a billion bits it would display 100, but would correspond to 0.00001% error rate.
Note this is AFTER the Vision box has done its error correction. The raw Bit Error Rate is typically much higher but the broadcast signal includes information to enable the receiver to correct for most errors.
If the signal level is very high it can overload the box and result in poor quality and poor picture despite having a high signal level.
As Umpire said a signal quality of 100% will result in a perfect picture.
Do make sure that your HDMI cables are away from your aerial cables as they can cause interference. If you use the TV's Freeview tuner does that give a better picture or does it also suffer in the same way?
Also try entering your postcode into the UK Free site at http://www.ukfree.tv/transmitters.php - this gives you information about your local transmitter, including distance, scheduled engineering work and aerial recommendations.
BT TV Expert
I am a BT Employee and an expert on TV queries. I am here to give advice primarily on the BT Vision+ box. Go Here for more info.
If my post has been helpful, please click on the Ratings star on the left-hand side of the post.

Similar Messages

Difference between signal strenght and quality?

Hi all,
As per Cisco documentation
Low RF signal strength does not mean poor communication.
Low signal quality does mean poor communications.
If someone can explain me difference between signal strength and signal quality?
As per my home AP i can see that signal strengh is measured in numbers like 50 % or 100%.
But what is signal quality and how me measure it ?
thanks
mahesh

Great question ....
First, lets look at the concept of signal quality and strength ... Suppose for a minute you are front row at a rock concert right next to the speakers. The sounds is so loud you cant hear anything but screaming. This is an exmaple of a loud signal but poor quality.
As for measuring the signal and noise or should we say quality of signal. Vendors sometimes give you a % or dB scale when grading the signal.You really cant make headers or tails from the % scale becuase each vendor has different % measurements. But check your ap, becuase you may have the option to change it to dB.
Lets look at dBm. Right now my client is showing:
Signal -59 dBm
Noise -98 dBm
The dB scale is simple. The lower the dB the LOUDER the signal. You will see -59 of signal is good, in fact I am about 50 feet from the AP. If you are right under the ap you will get like a -30ish. Noise, we dont want to be loud, so we want to see noise at -100. The lower the noise dB the louder the noise is.
So back to out example above. Next to the speaker, you are showing say -30dBm but your noise may be like -70dBm...
Does this make sense?
You normally like to see your signal no higher than -67 for voice or -76 for data. And your noise should be higher than -90.

What are the main differences between Signal Express and Labview?

National Instruments provides a matrix so one can quickly compare the
various versions of Labview but no comparison of Signal Express with
Labview. Hence how does Signal Express compare with Labview? What
are some of the things one can do with Labview one can't do with
Signal Express?
Howard

hrh1818 wrote: Which version of Labview are you referring to? I don't consider the graphical version of Labview to be a full featured programming language. LabWindows/CVI is by a long shot a lot closer to being a full featured programming language than the graphical version of Labview.
Howard,
You clearly don't know what you are talking about. There is no "graphical version" of LabVIEW, there is just LabVIEW. Click on the article "Is LabVIEW a general purpose programming language?" written by the Jeff K. for some easy reading from a few years ago. It is all still true (except that object oriented features and recursion have been added in recent versions).
One of the main points at this years NI-week was the discussion of how processor development is switching more and more to multicore designs to improve performance because a simple boost in clock frequency is becoming more difficult. Linear, text based code is not well suited to take advantage of multticore design, while the dataflow based LabVIEW programming language automatically scales well to multiple processor cores, without any need to rewrite older code. I would say that only LabVIEW is futureproof in this respect. LabVIEW programmers are not wimps that are simply too stupid to write text based code. LabVIEW is not a toy language for people that don't want to learn a "real" programming language.
LabVIEW is arguably the best programming language in terms of getting things done! I've never felt limited with LabVIEW and my programs often don't even have anything to do with data acquisition or instrument control. The difference between text based code vs. LabVIEW is like "DOS vs. Windows", "Radio vs. HD television". "Trilobyte vs. Homo sapiens" (sorry Putnam ). Text based code is monochrome, archaic and outdated and its linearity imposes unecessary constraints on the programmer that can only be (partially) overcome by wasting even more time throwing even more code at it.
Sure, a seasoned text based programmer will initially have problems adapting to LabVIEW, just because you would need to adapt to and embrace the power of dataflow and not try to make a literal translation of the text code to LabVIEW, retaining old habits. If you get stuck, come back and ask here in the forum.
You were looking for object oriented features and failed. All you need to do is a quick site search. All the information is out there. Just because you cannot find it in the first five sentences of the glossy brochure does not mean it does not exist. Maybe you want to read one of the application notes such as:
LabVIEW Object-Oriented Programming: The Decisions Behind the Design
In general, you should avoid judgement until you have all information. Your opinions seem quite biased and superficial and not really based on hard facts.
Initially you asked about the difference between signal express and LabVIEW.
hrh1818 wrote:
> What kind of measurments do you want to do and what kind of requirements do you have?
> You can also see for yourself and download evaluation version of both.
No thanks, there has to be a better way to get an answer to my
question than get involved in a two month study project.
If you would answer the first question quoted above, we could certainly help you with the decision. Isn't that the main purpose of this thread?
You can also contact your local LabVIEW Field Engineer to go over your requirements and help you make a decision. They usually know their stuff!
Message Edited by altenbach on 09-02-2007 11:51 PM
LabVIEW Champion . Do more with less code and in less time .

Difference between new network and extended network

Difference between extended network and new network settings

An "extended" network acts as one large wireless network. Wireless devices can roam anywhere a signal is present and stay on the network without having to make any changes.
A "new" network will require that a wireless device manually "switch" to that network and enter the password for the network to connect whenever you want to use that network. In other words, a "new" network will use a different wireless network name and password, which will require that you manually log on to that network.
The exception would be if you created a "new" wireless network and used the same wireless network name, same wireless security settings and same password as the "main" network and connected the AirPort back to the main router using an Ethernet cable. In that case, you would have an "Ethernet extended wireless" network.

Any basic differences between AT&T and Verizon, & other questions

I am thinking of buying an iPad mini with retina display (32gb). This would most likely be the only iPad I would ever own. I would use it mostly at the house with wifi, but would like to have one with cellular for when we travel in the US and Canada, and for when the electricity goes out. We currently live in a location where both AT&T and Verizon are viable options, but sometime in the next year we hope to move. The state is rural and mountainous, so as we drive around, my spouse's iPhone (with an AT&T plan) often loses service, but so does my Jitterbug phone, which is not tied to any one carrier (as far as I know). A phone can get a signal in one locaton, but then lose it a few feet down the road. So, there is no way I can choose between AT&T or Verizon based on coverage because both are options right now and there is no way to predict which one(s), if any, might provide service to wherever we end up moving to. Therefore, I'm wondering if there are any basic differences between AT&T and Verizon (or any other of the possible carriers) in what they offer or how they work or what they charge and so on that can help me decide which one to choose since it is my understanding that once I pick one of them for an iPad, that decision can never be changed without purchasing a new device. (e.g., I had read somewhere that Verizon does not allow for voice and data at the same time, but since an iPad is not a phone, is that even an issue?) Also, will the iPad work if there is only regular 4G or 3G service? And will a cellular iPad work without signing up for a data plan since I expect to start with only wifi and then add a data plan later? Thank you.

Alfred DeRose, Thank you for answering the second and third questions. Judging by what you wrote, I am assuming there are no differences between what AT&T and Verizon offer that affects iPads, other than looking at coverage area and the cost of "pay as you go" plans. And, as noted, coverage is not something I can base a decision on at this time. So, I either flip a coin to choose between AT&T and Verizon and hope the result is the right one after we move to wherever we end up finding a place to live, or I continue to wait for another year or more until we actually find a new house before I buy an iPad (or maybe a Kindle Fire HDX 8.9"to save money, but I think I've probably settled on an iPad mini retina 7.9" despite its smaller screen). That does not move me along the decision-making process at all, but it is what it is.
Greatcall has not answered my question about what carrier(s) the Jitterbug Plus phone uses. If, in fact, it uses just the Verizon network, I will try to pay better attention to any possible differences in service areas between that phone and my spouse's iPhone as we travel around the state to see if that helps at all. But coverage is so location specific here that I don't think it will.

What is the Difference between S/N and SINAD?

Hey,
can any one give me the answer for the following question.
What is the difference between S/N and SINAD?

S/N measures the difference typically between the signal (or full scale input range) and the thermal noise floor, usually in dB.
SINAD is similar except for the fact that it also takes into account spurs in the frequency domain. So SINAD should always be <= S/N. SINAD is similar to Spurious-Free Dynamic Range (SFDR).
Dynamic range is a term sometimes used for these concepts, but dynamic range is vague in that it doesn't make clear whether spurs should be taken into account. SFDR eliminates that ambiguity, as well as S/N or SNR.
Regards,
Andy Hinde
National Instruments

Quality difference between S-video and RCA

Can someone tell me what's the difference (in quality) between S-video out and RCA out?
I'm using RCA out because with s-video, the image shows up in black and white on my TV.
It would help to know I'm not loosing too much quality this way...
Regards everyone.

pauliewog is speechless
But what Robi says is true!
The various forms of (analogue) signal transfer are, in descending order of quality:
RGB - The Red, Green and Blue signals are generated by the PC (say), and connected by separate wires to ultimately control the Red, Green and Blue electron guns of the display monitor/TV set. The standard 15-pin "VGA" connector is RGB (plus H and V synchronising pulses).
YUV - Also called Component, and YCrCb, as found on DVD players. The Y is the luminance, or Black-and-White component, while the Cr and Cb are the Differences between the Y and the Red and Blue signals respectively. Usually, the Y signal has higher bandwidth than the Cr and Cb signals (twice as many Y samples as Cr and Cb samples on the DVD). Still needs wires, but the Sync is added to the Y signal.
Y/C - aka S-Video. The Y is as above, but the Cr and Cb signals are used to modulate a subcarrier (3.579545MHz for NTSC, 4.43361875MHz for PAL), with one of the signals effectively at 90 degrees to the other - the C signal. The bandwidths of the colour difference signals need to be bandwidth limited to about 1/3 of the subcarrier frequency (about 1.7MHz for PAL from memory), compared to the Y bandwidth of 5MHz for broadcast television. In PAL, the phase of one of the signals is inverted every other line (PAL = Phase Alternating Line, aka Peace At Last). Transmission errors which result in green faces and purple trees in NTSC (National Television Standards Commitee, aka Never Twice the Same Colour) tend to desaturate the colours instead.
CVBS, aka Composite Video (also RCA, named after the company that developed the type of connector used, which is typically yellow for video). The Y and C (and sync) signals are combined one one wire. The TV has a harder job of separating them back to RGB :(
RF (Radio Frequency). The CVBS signal is modulated onto an RF carrier, which could be anywhere between about 45MHz and about 1000MHz (not counting satellite distribution), so that it looks the same as a broadcast TV station to a TV set, and connects via a single cable to the antenna socket of a TV set. So first the TV has to demodulate the signal back to CVBS, before separating the Y and C, then separating the C into Cr and Cb and putting into a matrix with the Y to get RGB back. Nevertheless, this is a useful technique for distributing a signal to a lot of TV sets over a reasonably large area. It is also the only method that works with old TVs without A/V inputs - which is why game consoles used to come with an RF Modulator (aka RF Converter) as standard.
The above methods are also in descending order of signal bandwidth, which restricts the available resolution, or the finest horizontal detail (especially colour detail). Generally, 800x600 is about as good a resolution as you can expect to get on a TV display without resorting to special enhancing techniques.
The above is probably a lot more detail than you need, but is still a fairly superficial explanation. But study it up, the test is next Monday at 9am :D
Cheers

Difference between EDN-DB and EDN-JMS implementation

Experts,
Looking for a difference between EDN-DB and EDN-JMS implementation. We have EDN implementation going on, where multiple source systems will be publishing business events. Events can be published using SOA Suite or JMS Bridge from AQ and MQ. In this scenario which implementation approach is suited better ?

Oracle Apps Adapter can be used for many other products other than E-Business Suite (JD Edwards E1, OTM, and others). The apps adapter was mainly used in ERP systems and was strong when you needed have added functionality other than just polling a db for a status / calling a stored procedure... It could connect out to other business services, xml gateways and so-on.
From a technical aspect / development perspective I always thought of that the Oracle Apps Adapter simplifies the development but, may is not flexible. The App Adapter's strength is the services that are difficult to integrate with (business services, xml gateway). If you need to hook in to these types of services, use the APPS adapter. (Again like it is named the "Apps Adapter" its for interacting w/ other applications to enable real-time processing / functionality.
That being said the dbAdapter can be very powerful but, like it is named is database focused (to poll some table to know when to kick off other logic and enable real-time functionality through database interaction.
Looking at the Oracle 12C Roadmap I had heard that there is more planned for the Oracle Apps Adapter moving forward, especially as Anuj said in the "Financial Apps" side of the isle at Oracle. Who knows what is real and what isn't though =]
Hope this helps!
-Luke

Difference between Golden Client and Master Client

Dear,
What is the Difference between Golden Client and Master Client?
Thanx & Regards,
Mohammad Nabi,
[email protected]

Golden Client is similar or is the the same as Development Client, which should not be used for testing.
Master Client ???
Note on SAP Landscape:
Landscape is like a server system or like a layout of the servers or some may even call it the architecture of the servers viz. SAP is divided into three different landscape DEV, QAS and PROD.
- DEV would have multiple clients for ex: 190- Sandbox, 100- Golden, 180- Unit Test.
- QAS may again have multiple clients for ex: 300- Integration Test, 700 to 710 Training.
- PROD may have something like a 200 Production.
These names and numbers are the implementer's discreet on how they want it or they have been using in their previous implementations or how is the client's business scenario.
Now whatever you do in the Sandbox doesn't affect the other servers or clients. Whenever you think you are satisfied with your configuration and you think you can use it moving forward, you RE-DO it in the golden client (remember, this is a very neat and clean client and you cannot use it for rough usage). As you re-do everything that you had thought was important and usable, you get a transport request pop up upon saving every time. You save it under a transport request and give your description to it. Thus the configuration is transported to the Unit Test client (180 in this example).
You don't run any transaction or even use the SAP Easy Access screen on the 100 (golden) client. This is a configuration only client. Now upon a successful transport by the Basis guy, you have all the configuration in the Testing client, just as it is in the Golden client. The configuration remains in sync between these two clients.
But in the Testing client you can not even access SPRO (Display IMG) screen. It's a transaction only client where you perform the unit test. Upon a satisfactory unit test, you move the good configuration to the next SERVER (DEV). The incorrect or unsatisfactory configuration is corrected in Golden (may again as well be practised in the sandbox prior to Golden) and accordingly transported back to 180 (Unit Test) until the unit test affected by that particular config is satisfactory.
The Golden client remains the 'database' (if you wanna call it that) or you may rather call it the 'ultimate' reference client for all the good, complete and final configuration that is being used in the implementation.
In summary:
Landscape : is the arrangement for the servers
IDES : is purely for education purpose and is NOT INCLUDED in the landscape.
DEVELOPMENT ---> QUALITY -
> PRODUCTION
DEVELOPMENT : is where the the consultants do the customization as per the company's requirement.
QUALITY : is where the core team members and other members test the customization.
PRODUCTION : is where the live data of the company is recorded.
A request will flow from Dev->Qual->Prod and not backwards.
1. Sandbox server: In the initial stages of any implementation project, You are given a sandbox server where you do all the configuration/customization as per the companies business process.
2. Development Server: - Once the BBP gets signed off, the configuration is done is development server and saved in workbench requests, to be transported to Production server.
3. Production Server: This is the last/ most refined client where the user will work after project GO LIVE. Any changes/ new development is done is development client and the request is transported to production.
These three are landscape of any Company. They organized their office in these three way. Developer develops the program in Development server and then transport it to test server. In testing server tester check/test the program and then transport it to Production Server. Later it will deploy to client from production server.
Presentaion Server- Where SAP GUI has.
Application Server - Where SAP Installed.
Database Server - Where Database installed.
Regards,
Rajesh Banka
Reward points if helpful

What is difference between sy-tabix and sy-index.

SAP Seniors,
Can you please let me know what is difference between sy-index and sy-tabix.
I read the SAP help, it is confusing for me. it looks like both are same from help. please help me.
Thank you
Anitha.

HI,
Here is a brief description of difference between SY_TABIX and SY_INDEX and using them with several conditions.
SY-TABIX
Current line of an internal table. SY-TABIX is set by the statements below, but only for index tables. The field is either not set or is set to 0 for hashed tables.
APPEND sets SY-TABIX to the index of the last line of the table, that is, it contains the overall number of entries in the table.
COLLECT sets SY-TABIX to the index of the existing or inserted line in the table. If the table has the type HASHED TABLE, SY-TABIX is set to 0.
LOOP AT sets SY-TABIX to the index of the current line at the beginning of each loop lass. At the end of the loop, SY-TABIX is reset to the value that it had before entering the loop. It is set to 0 if the table has the type HASHED TABLE.
READ TABLE sets SY-TABIX to the index of the table line read. If you use a binary search, and the system does not find a line, SY-TABIX contains the total number of lines, or one more than the total number of lines. SY-INDEX is undefined if a linear search fails to return an entry.
SEARCH <itab> FOR sets SY-TABIX to the index of the table line in which the search string is found.
SY-INDEX
In a DO or WHILE loop, SY-INDEX contains the number of loop passes including the current pass.
Hope this helps.
Thank you,
Pavan.

Difference between sy-tabix and sy-index?

tell me about sy-tabix and sy-index?what is the difference between sy-tabix and sy-index?
Moderator Message: Please search before posting. Read the [Forum Rules Of Engagement |https://wiki.sdn.sap.com/wiki/display/HOME/RulesofEngagement] for further details.
Edited by: Suhas Saha on Jun 18, 2011 5:33 PM

HI,
Here is a brief description of difference between SY_TABIX and SY_INDEX and using them with several conditions.
SY-TABIX
Current line of an internal table. SY-TABIX is set by the statements below, but only for index tables. The field is either not set or is set to 0 for hashed tables.
APPEND sets SY-TABIX to the index of the last line of the table, that is, it contains the overall number of entries in the table.
COLLECT sets SY-TABIX to the index of the existing or inserted line in the table. If the table has the type HASHED TABLE, SY-TABIX is set to 0.
LOOP AT sets SY-TABIX to the index of the current line at the beginning of each loop lass. At the end of the loop, SY-TABIX is reset to the value that it had before entering the loop. It is set to 0 if the table has the type HASHED TABLE.
READ TABLE sets SY-TABIX to the index of the table line read. If you use a binary search, and the system does not find a line, SY-TABIX contains the total number of lines, or one more than the total number of lines. SY-INDEX is undefined if a linear search fails to return an entry.
SEARCH <itab> FOR sets SY-TABIX to the index of the table line in which the search string is found.
SY-INDEX
In a DO or WHILE loop, SY-INDEX contains the number of loop passes including the current pass.
Hope this helps.
Thank you,
Pavan.

What is difference between sy-index and sy-tabix and where both are using ?

what is difference between sy-index and sy-tabix and where both are using ?

hi nagaraju
sy-tabix is in Internal table, current line index. So it can only be used while looping at the internal table.
sy-index is in Loops, number of current pass. This you can use in other loop statements also (like do-enddo loop, while-endwhile)
SY-INDEX is a counter for following loops: do...enddo, while..endwhile
SY-TABIX is a counter for LOOP...ENDLOOP, READ TABLE...
Here is an example from which you can understand the difference between sy-tabix and sy-index.
Itab is an internal table with the following data in it.
id Name
198 XYZ
475 ABC
545 PQR.
loop at itab where id > 300.
write :/ itab-id, itab-name , sy-tabix, sy-index.
endloop.
My output will be :
475 ABC 2 1
545 PQR 3 2
Sy-tabix is the index of the record in internal table.
sy-index gives the no of times of loop passes.
So, for the first record in the output (475 ABC), 2 is the index of the record in internal table and as it is first time loop pass occured, sy-index value is 1.
Regards,
navjot
award points

The difference between chapter markers and dvd studio pro markers

Does anyone know what is the difference between chapter markers and dvd studio pro markers? I can not find anywhere on Google. Also in the tutorials I have seen, suggesting DVD Studio Pro markers, but it did not mention the chapter markers.
Thanks,

"Adding Chapter and Compression Markers to Your Sequence
Once you have your edited sequence or program finished, you can add markers to the sequence for use on DVD. Markers are reference points you can place within clips or sequences that identify specific frames. There are two kinds of markers you can add that directly relate to authoring a DVD—chapter markers and compression markers.
• Chapter markers allow DVD authoring applications to create a navigable chapter list for your exported QuickTime movie. Chapter markers force MPEG keyframes (known as I-frames) at their location, since the DVD specification requires an I-frame at each chapter point.
• Compression markers identify areas of abrupt change and include two types: those that are automatically inserted by Final Cut Pro at all edit points, and those you manually place in the clip or sequence. Like chapter markers, compression markers force I-frames at their location, although in this case it is for better quality encoding, and they are not used to create a chapter list.
Note: When you export a QuickTime movie, you have an option to export various kinds of markers, including compression, chapter, or DVD Studio Pro markers. *When you choose to export DVD Studio Pro markers, Final Cut Pro actually exports chapter markers and all compression markers.* This includes compression markers you set manually, as well as ones created automatically by Final Cut Pro at edit and transition points."
From the Final Cut Pro User Manual.
So, JS was right the first time

The difference between an iphone and an ipod touch?

i want to know if the difference between an iphone and an ipod touch is just that the iphone is like a phone that has internet and is a phone. or what else is it?

The iPhone includes the same as an iPod Touch but also includes a phone, a camera, and a GPS radio.
In addition to having internet access via wi-fi, the iPhone also has internet access via the cellular network, so as long as you have cellular reception with the iPhone, you have access to the internet in addition to having access via an available wi-fi network.

The difference between system restore and last good known configuration

hi,
what is the difference between system restore and last good known configuration.
in which situation you use system restore ,and in which situation you use last good known configuration.
very short answer wil be enough.
thanks
johan
h.david

Last Known Good Configuration deals only with Starting Windows eg. a bad registry or incorrect driver is preventing Windows to start.It recovers the registry settings of HKEY_LOCAL_MACHINE\System\CurrentControlSet
While System Restore uses restore points to return your system files and settings to an earlier point in time without affecting personal files. Restore points are created automatically every week, and just before significant system events, such as the installation
of a program or device driver. You can also create a restore point manually.You can undone system restore but there is no such option in Last Known Good Configuration.
Last Known Good Configuration is disabled in Windows 8 or,Windows 8.1 by default.
Try using Last Known Good Configuration if you can't start Windows, but it started correctly the last time you turned on the computer.
Try using System Restore to return the system to an earlier point in time when things worked correctly.
S.Sengupta, Windows Entertainment and Connected Home MVP

Difference between sy-datum and any given date

Dear Friends;
I have one query regarding DATE I wanna calculate the difference between
SY-DATUM and ANY GIVEN DATE . Is there any function or code available that take one parameter as sy-datum and another parameter as any given date and give result as no. of days between them
Regards;
Parag

DATA: DATEDIFF TYPE P.
CALL FUNCTION 'SD_DATETIME_DIFFERENCE'
EXPORTING
    date1                 = '20071122'
    time1                 = '000001'
    date2                 = '20070905'
    time2                 = '000001'
IMPORTING
   DATEDIFF               = DATEDIFF
EXCEPTIONS
   INVALID_DATETIME       = 1
   OTHERS                 = 2.
Greetings,
Blag.

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