EVM measurement

Hi,
I have NI USRP 2922 and LabVIEW software. Can someone guide me how to make a coding for EVM measurement to measure the performance of transmit receive (point to point) signal??
Thank You,
Regards,
Mardiah

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Capture E4406 EVM measurement screen

Hi distinguished NI engineers,
           Nowadays , I attemps to setup EVM test in our lab. All seems ok except screen capture problem.From the E4406 programming manual ,this insturment supports screen capture functionality.
           This commands says it would provide a view of numeric results and a ploar constellation graph in the two windows.How i can realize that in labview, my experience for this is limited.
          Could anyone raise me a hand? Thanks.
Attachments:
schematic.JPG ‏23 KB
COMMAND.JPG ‏36 KB

Hi Dennis,
                Sorry for reply late. I will clarify something~~
You seem to be asking a couple different
questions. First, does the command work? I mean, does the screen change
to reflect what you want?
(The command really work.)
Second, you are doing a read but you haven't issued any command to
the instrument to send any data. You would need to issue a query (i.e.
something with a '?' at the end.
(I have already configured the command"DISPlay:EEVM CONStln" to the VISA write. Do you mean i still need to issue the command to Visa Read before get the expected graph?)
Third, you mention a screen capture but you are not issuing any
command that tells the instrument to perform such an operation. That's
a command you will have to look up and then find the command to
transfer it to the pc.
(I already issue the command"DISPlay:EEVM CONStln" command to perform the command and also configure the measurment before display the screen.I was a bit lost.What kind of command you think i need to put it into? Because i think the sequence is clear:configure the measurment-->conduct the measurement-->capture and display the result.)
Fourth, when you finally do issue a query and do a read, you will
have to convert the string returned into numeric data before it can be
displayed on a graph.
(Yes ,I'll remember this rule to get the graph.)
Fifth, a LabVIEW graph will not correctly display a polar plot. You
will probably have to use the picture indicator to display this. Look
at the shipping examples. Do a search for 'polar'. You may be able to
do a normal trace on the instrument, fetch that, and display the data
in LabVIEW without setting up the instrument to do it. I suspect this
will be faster than setting up the instrument, doing a capture,
transfering the capture, and then converting the capture to be
displayed in LabVIEW.
(All i want is to capture the whole measurment screen, Do you think it make sense?Maybe i do not care whether it's a polar plot or other kind of graph.)
           Thanks a lot for your replay and patience.
Evan

11gR2 : Failed to start EVM while running root.sh in Node1

DB verision:11GR2
Platform : Solaris 5.10 (Amd64)
I've reached the last step in the installation in Node1
# ./root.sh
.............all messages say succeeded till here............
CRS-2676: Start of 'ora.crsd' on 'hudson1' succeeded
CRS-2672: Attempting to start 'ora.evmd' on 'hudson1'
Start action for daemon aborted
CRS-2674: Start of 'ora.evmd' on 'hudson1' failed
CRS-2679: Attempting to clean 'ora.evmd' on 'hudson1'
CRS-2681: Clean of 'ora.evmd' on 'hudson1' succeeded
CRS-4000: Command Start failed, or completed with errors.
Command return code of 1 (256) from command: /u01/grid/bin/crsctl start resource ora.evmd -init
Start of resource "ora.evmd -init" failed
Failed to start EVM
Failed to start Oracle Clusterware stackA search in OTN and MOS returned nothing. Any idea how i could diagnose this issue?

Hi,
Check this note on MOS.
*Troubleshooting 11.2 Grid Infastructure Installation Root.sh Issues [ID 1053970.1]*
A Troubleshooting Guide is provided to assist in debugging a specific issue. When possible, diagnostic tools are included in the document to assist in troubleshooting.
Regards,
Levi Pereira

EVM-HD-8FXS problem

In router/gateway 3825 I have a EVM-HD-8FXS/DID card and I want it register with CallManager. I have on CallManager "AALN/S1/SU0/[email protected]", Device type "Cisco MGCP FXS Port" Status:"Rejected". Any idea why is it rejected?

check ur Router if it has following commands
ccm-manager mgcp
ccm-manager config server
ccm-manager config
mgcp
mgcp call-agent 2427 service-type mgcp version 0.1
mgcp dtmf-relay voip codec all mode out-of-band
Verify u have "ccm-manager config"

EVM measurement

Hi,
I have NI USRP 2922 and LabVIEW software. Can someone guide me how to make a coding for EVM measurement to measure the performance of transmit receive (point to point) signal??
Thank You,
Regards,
Mardiah

There are a number of things that could be going on. There could be other errors occurring, but you don't have any of your error clusters connected.
Next, a TCP/IP network is not deterministic. The amount of time it takes to do something can vary dramatically, What timeout values have you used? Are you sure the device is seeing the request and responding in a timely manner?
Related to that point, what is your network topology? Remember that you are sharing the network bandwidth with everybody else using it.
Mike...
Certified Professional Instructor
Certified LabVIEW Architect
LabVIEW Champion
"... after all, He's not a tame lion..."
Be thinking ahead and mark your dance card for NI Week 2015 now: TS 6139 - Object Oriented First Steps

[SOLVED] evms root support in mkinitcpio?

Hi,
I'm trying to get a system set up with an EVMS volume for the root partition (EVMS for everything except /boot, actually). I tried the initrd image on the EVMS site (http://evms.sourceforge.net/), since the EVMS package (current/evms 2.5.5-3) didn't seem to come with one; that didn't work so well (the kernel panicked before it even got as far as finding the hard drive).
The package also doesn't seem to have the various kernel patches described on the site, so I assumed they weren't necessary (at least, I know the device mapper, etc. are already in kernel26)... I can run evms and successfully set up and mount volumes on a second hard drive, but it won't activate volumes properly on the boot drive, probably for the reasons described here: http://evms.sourceforge.net/install/kernel.html (under "BD Claim Patch").
Anyway, I'm now trying to add evms_activate to the initcpio thing, but the problem (as I see it) is that the BINARIES gets run before HOOKS, which is a bad thing, because hooks is where udev and the device mapper are and evms_activate wants those.
Is there any way to make the binaries run *after* the hooks? How about a way to edit the hooks? I notice Arch has hooks for lvm2 and software RAID, but not one for evms -- is one on the way if/when more people start using EVMS? I understand that EVMS is just software RAID + LVM2 bundled, but it also has some other features that I very much want to use that aren't in those -- namely bad block handling. Is there some reason more people aren't using it that I should know about?
Any help appreciated,
~Felix.
Last edited by thetrivialstuff (2007-08-13 01:31:17)

I've made some progress, and believe I would now be able to boot my system if my desired root partition weren't in an EVMS LVM/RAID container -- I can see the EVMS 'compatibility' volumes in the initial /dev filesystem created on the ramdisk, with their fancy EVMS labels & everything.
I wrote my own hooks files for mkinitcpio (after realizing that most of that whole system is just shell scripts), and once I have everything working I'll submit/post them.
My current problem is with the RAID modules on startup -- it looks like md-mod is automatically creating md{0,1,2} and then EVMS tries to create those as well and dies with "md: md0 already has disks!"
~Felix.

Cisco EVM-HD

Good day, we have a Cisco High-Density Analog And Digital Extension Module for Voice and Fax (EVM-HD)for our new Cisco 3845 Router. My question is, what did you call about the port connection at the back of the Module, its like a female serial connection 25 pins. Is it shipped with a cable to be connect on that module? I will wait for your answer, thanks.

Hi Mahmoud,
Just to add a note to Mauliks good info (5 points for this nice work Maulik!)
Connecting Cisco High-Density Extension Modules to the Network - ***Make sure you order the RJ21 with a "MALE" connector***
The Cisco high-density extension module is connected to a distribution frame or patch panel with an RJ-21 cable.** RJ-21 cables are not provided with the network module.
Here are the parts you would need to connect to a 24 port rack mounted Patch Panel (without needing to terminate the cable with Bix or 110 connecting tools).
Cisco RJ21 Cables
http://www.stonewallcable.com/product.asp?dept%5Fid=102&pf%5Fid=SC%2D9754
24 Port with RJ21 Male
http://www.cablingsys.com/iteminfo.asp?productcode=017-224M62U
These are just examples :) I have not checked pricing $$
Hope this helps!
Rob

How to measure LTE signal EVM

Ｈｉ　Ａｌｌ，
I use R&S instrument(SG and spectrum analyzer) to measure LTE-TDD EVM,(Center Freq: 2.6G, power: -30dBm)
But I am at a loss that I get the the value 87.18(EVM PDSCH 64QAM) , it beyond the limit 8.
I donot know how to make it, can anybody do me a favor?
And BTW, who can provide the remote commands for measure EVM, I want to use Labview to control it instead of manually.
Thanks a lot
Amanda

Hi Amanda,
Which specific Rohde & Scwarz instruments are you using? We have instrument drivers at ni.com/idnet for a number of devices, including some R&S SG's and analyzers. You can also download LabVIEW drivers at their website here. These should help you interface your instruments with LabVIEW. You should also make sure that you have NI-VISA installed on your machine. You can search for, download and install the appropriate version of this driver here.
Hope this helps!
Regards,
Stephanie R.
National Instruments
Stephanie R.
National Instruments

Capturing timescaled EVM values via PSI or SQL

Hi,
My team now try to develop a Project Server web part which enables users to see the timescaled EVM graph of a project/task.
But we are worried that it is impossible to capture timescaled EVM values from Project Server using PSI or SQL.
Is it possible?
And if so, please tell us how to accomplish our goal.
Any advice (even if negative one) will be appreciated.

the version of Project Server is 2013.

2821 Router with EVM-HD-6FXO

Hi all,
I want to buy a 2821 router with an EVM-HD-6FXO module. The 2821 is running IOS "c2800nm-ipbase-mz.124-15.T10.bin". My question is can I use the 2821 as a Gateway for CUCM v10.5 or if I have change upgrade the IOS to a different version.
Thanks.

Yes, run SIP or H323 which is version agnostic, even MGCP will work though according to Cisco 15.X code is required.
Chris

2.7 GHz vs 6 GHz ... EVM Differences

Dear NI RF HW Guys,
I have a 2.7 GHz RFSA as well as a 6 GHz RFSA ....
I see a huge difference in my EVM readings with the
same Labview VI and same DUT transmitting a predefined packet.
I am decoding my frames in 2.4 GHz band.
I get favourable results in the 2.7 GHz RFSA.
Can anyone explain why is this huge difference in EVM,
when I have not changed my Labview VI and the DUT transmit conditions
Regards,
Dharmendra
Solved!
Go to Solution.

"Shouldnt EVM be same irrespective of HW differences ?"
Not
necessarily. Phase noise and amplitude accuracy have bearing on EVM and
although I am not saying at this point that these are the explanations,
HW difference makes a great impact on EVM performance in general. The
digitizer difference between 5660 and 5661 most likely will not make a
large difference in performance, and indeed you will notice the EVM
specs for 5660 and 5661 are the same.
"Andy, Just in case you were worried about signal saturation / clipping ...."
I
am indeed worried about saturation. You're generating a 0 dBm signal
into an analyzer whose max input level has been set at -10 dBm. How do
things change when you use the proper reference level of 0 dBm? You
say you are capturing a clean RF signal and I am curious as to how you
determine this? Visually by looking at the spectrum? Signal distortion
leads to amplitude errors and amplitude errors are one component of
what EVM measures. Do you see a difference in EVM between reference
level of 0 and -10 dBm?
Our EVM specs for QAM are
listed in the 5663 specs and can be compared to 5660/5661 EVM specs.
This data clearly shows the EVM performance of the 6.6 GHZ platform is
better than the 2.7 GHz platform.
One difference
between the 2.7 GHz platfrom and the 6.6 GHz platform is the amount of
'headroom' between the stated reference level of the PXIe-5663 and the
clipping level of the instrument. A -10 dBm reference level places the
clipping/overload level @ 0 dBm on the 2.7 GHz platform. The same
reference level would place the clipping level @ -4 dBm I believe (I
could be off by 1 or 2 dB but not much more) on the 6 GHz platform. In
any case, there is less headroom on the 6 GHz platform since the 6 GHz
platform has 1 dB attenuation resolution (as opposed to 10 dB
resolution on 2.7 GHz platform) and doesn't require as large an amount
of headroom. This could very well be your issue.
As a
test you should run generator and analyzer examples for the Modulation
Toolkit, QPSK, and see what happens. Also, perhaps we can provide more
assistance if you provide your code and the ability toreproduce the
behavior you are seeing. If we can reproduce it we can figure out why
you are seeing differences. At the very least I recommend using a
correct value for Reference Level.
Regards,
Andy HindeNational Instruments
Message Edited by Andy Hinde on 06-11-2009 10:13 AM
Message Edited by Andy Hinde on 06-11-2009 10:14 AM

Configuring a EVM-HDA-6FXO for power failure

I want to add a EVM-HDA-6FXO to an exsiting EVM-HDA-8FXS/DID so if power goes out I can still have the FXO ports provide dial tone to the FXS ports.
Two emergency lines NPA-NXX-1000 comes in as a FXO and goes out a FXS port.
Can this be done. And does it work if the power is off to the router.

The FXO expansion module supports a power failure port that connects directly to the central office (CO) in case of failure.

EVM-8FXS/DID

Hello,
I have a 2821 with a EVM-8FXS/DID installed on EVM slot with a blackbox panel, i have also conected a analog phone on port 7 (voice port 2/0/7) that is working fine, i also have conected a phone in por 0,1,2,3,4,5 but the phone does not work, i tryed to swith the phones but the problem seems to be related with port's 0,1,2,3,4,5.
With show voice port summary I can see tha the port goes off-hook
Can someone help me

What is the P/N for for blackbox patch panel you are using?

EVM-HD-8FXS/DID as backup

Customer wants 12 pots lines for backup in case the PRI is down. I was thinking of using EVM-HD-8FXS/DID which will give me 8 DIDs and 4 port FXO card or FXO expension module. The question is can I make outbound calls on these lines when configured as DIDs? Is there a better solution?
Chris

You should be able to use DID trunks (as long as telco provision them as DID trunks) and set all the FXS ports to DID mode. You get 8 base FXS ports on the EVM and you can either add 6 FXO cards or add a 3 FXS/4FXO card or another 8 port FXS port daughter card (expansion module). In DID mode, you wont get any dialtone (much like FXO)
I am not sure if DID mode is available on the expansion cards. Also if you mix and match FXS and DID modes you have to take care of impedance settings. Check this link
http://www.cisco.com/en/US/products/hw/modules/ps2617/products_configuration_example09186a0080513001.shtml
HTH
Sankar
---edited----
I dont think you can configure any ports on the EM cards in DID mode. I strongly believe, you are limited to 8 DID ports (base FXS ports)

EVM-HD-8FXS/DID EXT MODULE

HOW MANY FXS VOICE PORTS GIVE ME THE EVM-HD-8FXS/DID WITHOUT EM-HDA- EXPANSION MODULES?.
THANKS.

OK, IF I NEED 8 FXS PORTS AND 6 FXO PORTS, JUST NEED PURCHASE:
1x EVM-HD-8FXS/DID plus
1x EM-HDA-6FX0.
RIGHT?
Thanks.

EVM measuremen​t

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