BB speed with FTTC/21CN WBC

Hi,
trying to discover if I will benifit from FTTC/21CN WBC work thats happening to my exchange. I live in a small village on what is classed as a long ADSL Line, I sync around 900k. Now I know my exhange is SNOD(snodland) however talking to the BT engineer thats been working on my fault, most of his work with my line has been in a smaller exchange about 1 mile down the road(as the crow flies) next to our firestation. So I presume we dont have any street cabs but our lines go via telegraph poles direct to this smaller exchange for want of a better word.
Our exchange is due for upgrade very soon
With FTTC status end of March 2012
21CN WBC status end of August 2012.
Will this benifit me? I still have the same long line to the exchange, if FTTC is enabled, as far as I know(just from looking) we have no cabinets in our street. So appealing to the experts here.
Cheers, Lee

if your connection speed is <1mb then 21CN will make no difference to your connection speed. FTTC will depend on how far away the cabinet is from your home and more important if in fact you get a new infinity cabinet if you are that far away from the exchange
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Post 21CN WBC Experiences - Long Line?

Hi
My rural exchange is due for 21CN WBC upgrade this June
I was wondering if anyone has had a good experience following this type of upgrade - specifically on a long line
The 'experts' claim there will be no positive impact for low speed long line sufferers but interested to hear from anyone with 'real life' experience of this
My stats:
Sync around 1.3meg
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snr down 6db
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Faceplate fitted

big difference from 55 to 74 though a 1.3mb connection with 74 attenuation is good
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Very slow transfer speeds with external hard drives through Firewire and US

Hi All,
My external drives transfer very slowly on my MacPro. I've been searching for answers and have turned up very little. Apple support suggested I post my issue here. Just to make a note, I measured my disk speeds with both AJA System Test and copying files between drives and reading the Disk Activity in Activity Monitor.
I have 3 external drives, all MyBook Premium or Professional, 1x 500GB, 1x 1TB and 2x 1TB in RAID 0. I had them on Firewire 400 and the RAID 0 2TB one on Firewire 800. My transfers on FW were all around 24MB/sec on all drives (much less than what I should be getting with FW400). I then read somewhere that the FW bus on the MacPro uses the slowest speed connected for all FW connections. So I unplugged everything but the FW800 Raid 0 drive and my transfer rate jumped to 40-60MB/sec. This is much better, but still about half or so of what I expect it should be producing from an external RAID 0 setup.
To keep my FW800 backup drive faster, I've plugged the other two into USB2.0. The transfer speeds on both drives are now hideous, around 10-15MB/sec. This is so slow, but I'm not sure what to try to fix my speeds.
The HD's in the external drives are all 7200rpm, and all should be transferring at a higher rate. Do you have any suggestions or ideas? Ideally I'd like to get everything transferring at rates they should be transferring at, but I'll settle with my current FW800 speed of 40-60MB/sec if I can get my other two drives transferring at a non-snail pace.
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Thanks in advance.

Hi Kappy, thanks for the information.
So I rejigged my setup a tad. My RAID 0 is still FW800, the second drive is back on FW400 on the back port, and the third is USB 2.0 on the back as well.
It's interesting to note that I saw the FW800 taking a bandwidth hit if the FW400 drives was being read/written to. For example, if I was averaging 50-60MB/sec on the FW800 drives and copy something large to the FW400 drive, each drive averages out to about 30/MB second, roughly half the FW800 speed I was getting. The USB while the slowest didn't cause any slowness on the FW drives.
Here are my Xbench results. These results are from each drive being benchmarked individually with no other drives being tested at the same time.
*MyBook 2TB in a RAID 0 configuration: Firewire 800*
Results 75.42
System Info
Xbench Version 1.3
System Version 10.5.5 (9F33)
Physical RAM 16384 MB
Model MacPro3,1
Drive Type WD My Book
Disk Test 75.42
Sequential 80.92
Uncached Write 69.16 42.46 MB/sec [4K blocks]
Uncached Write 110.79 62.68 MB/sec [256K blocks]
Uncached Read 53.66 15.70 MB/sec [4K blocks]
Uncached Read 136.76 68.73 MB/sec [256K blocks]
Random 70.62
Uncached Write 36.38 3.85 MB/sec [4K blocks]
Uncached Write 140.55 45.00 MB/sec [256K blocks]
Uncached Read 93.26 0.66 MB/sec [4K blocks]
Uncached Read 88.38 16.40 MB/sec [256K blocks]
*MyBook 1TB on Firewire 400*
Results 47.73
System Info
Xbench Version 1.3
System Version 10.5.5 (9F33)
Physical RAM 16384 MB
Model MacPro3,1
Drive Type WD My Book
Disk Test 47.73
Sequential 52.47
Uncached Write 48.45 29.74 MB/sec [4K blocks]
Uncached Write 53.76 30.42 MB/sec [256K blocks]
Uncached Read 43.69 12.79 MB/sec [4K blocks]
Uncached Read 70.91 35.64 MB/sec [256K blocks]
Random 43.78
Uncached Write 17.29 1.83 MB/sec [4K blocks]
Uncached Write 98.83 31.64 MB/sec [256K blocks]
Uncached Read 76.33 0.54 MB/sec [4K blocks]
Uncached Read 97.01 18.00 MB/sec [256K blocks]
*MyBook 500GB on USB 2.0*
Results 40.60
System Info
Xbench Version 1.3
System Version 10.5.5 (9F33)
Physical RAM 16384 MB
Model MacPro3,1
Drive Type WD 5000AA External
Disk Test 40.60
Sequential 35.99
Uncached Write 37.31 22.91 MB/sec [4K blocks]
Uncached Write 37.22 21.06 MB/sec [256K blocks]
Uncached Read 26.62 7.79 MB/sec [4K blocks]
Uncached Read 50.27 25.27 MB/sec [256K blocks]
Random 46.55
Uncached Write 20.37 2.16 MB/sec [4K blocks]
Uncached Write 68.44 21.91 MB/sec [256K blocks]
Uncached Read 93.55 0.66 MB/sec [4K blocks]
Uncached Read 86.71 16.09 MB/sec [256K blocks]
So Kappy are you saying that those speeds look normal?
Thanks

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Hi everyone,
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Does someone have any idea how to solve the problem. I Googled a lot but without luck.
My system is: Wind Box DC111( RTL 8188CE in AzureWare AW-NE139H ), Windows 7 64 bit, router TP-Link WR843ND

You can try the Realtek driver if you think it's driver related: http://www.realtek.com.tw/downloads/downloadsView.aspx?Langid=1&PNid=21&PFid=48&Level=5&Conn=4&DownTypeID=3&GetDown=false&Downloads=true
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Encoder Speed with NI 9215 module and cDAQ-9172

I've a NI cDAQ-9172 with the NI9215 analog input module, and I want to estimate the speed with an optical encoder (OMRON E6A2-CW3C). My approach was, making a comparison with a point in the midle of the high of the signal, ie 4V, making this way a perfect square signal with 1of high. After that I use the Tone Measurements and the Timing and Transition Measurements modules to calculate the frequency of the wave form, and this way I'm able to calculate the RPM speed.
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Should I buy for example the NI 9401 module to make this measurement? If so, does any one knows how to build a VI to get the encoder speed?
In attach I send the VI that I'm using to calculate the speed.
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Attachments:
Encoder Speed.vi ‏112 KB

Hi,
The best way to measure a speed through a quadrature encoder is to use the counters that are inside the cDAQ chassis.
With the 9172 chassis, you need a digital I/O module (9401) in order to access the counters.
With the new generation of chassis (9178), you don't need the 9401 because you can connect your encoder signals to the BNC.
Best regards,
Thomas B. | CLAD
National Instruments France
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Measuring speed with incremental single counter

Hi,
I need to measure the rotational speed and acceleration of a wheel that has 3 hall sensors on it. I will use only 1 of them en it gives 24 pulses 0-5V for a 360° rotation. How can I measure the speed with only a pulse train. I dont have the Quadric encoder...
Now I'd like to measure the rotational speed using a counter of some sort, but the software I tried writing for it isnt working.
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Hey Nitch,
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As you get error when speeding up, it looks like the pulses coming from the hall sensors are to short to get measured by the counter.
Following the USB-6008 specifications, the pulse needs to have a minimum lenght of 100ns (both in high and low state).
As a counter is using edges to count the pulses (for USB-6008 only the falling edge) the edges need to comply with the TTL specifications which means that the rise and fall time of the pulse needs to be within the 50ns range.
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Looking at your program.
It's not nescesarry to have two loops. It's very well possible to have two DAQ tasks within the same look.
Have a look at the Examples which come with LabVIEW --> Exampled Finder --> Hardware Input/Output --> DAQmx --> Synchronization --> Multi-Function.
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As you VI is written now, the left while loop will only output the lastest counter value measured to the next loop when you click the stop button for example.
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You can simply use the loop iteraction counter (the square box in the left bottom corner with the i). This is also counting from 0 and incrementing by 1 each loop iteration.
Again, you can do this in the left loop and forget the second loop completely.
Hopes this will bring you a step further.
Don't hesitate to post the VI itself. This is always easier to look at than an image.
This way we can also make some modications and post it back.
Best regards,
Joeri
National Instruments
Applications Engineering
http://www.ni.com/ask
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Hi,
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Hello,
First, some preliminary information:
I'm currently in need of a wireless adapter for my desktop computer. I recently got an Asus RT66U router, so I'm looking for a wireless adapter that supports the 802.11ac standard. The best candidate I've come across is the Asus PCE-AC68, and PCIe based adapter that uses Broadcom's BCM4360 chip, the same wifi chip used in the Late 2013 retina Macbook Pro. It is worth noting that every available 802.11ac compatible PCIe based wireless adapter seemingly uses this chip (I've heard of people having success with 802.11ac speeds using Qualcomm Atheros based wifi adapters and the ath10k driver, but there are no Atheros-based PCIe wireless adapters on the market, as far as I can tell).
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I have found user reports here and here from April 2014 stating that the driver runs BCM4360 based adapters in 802.11a/b/g mode and doesn't allow 802.11n and 802.11ac connections to be made. On the other hand, this user (in a post from June) states that he managed to get ac speeds in Arch simply by changing his router settings. Unfortunately, he doesn't detail what changes he made.
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Last edited by aliwho (2014-07-18 22:02:40)

I am currently using the BCM4360 (rev 03) in a MacBook Pro. You are correct in that it does not work with the b43 driver. It mostly works with the proprietary wl driver. I am using the broadcom-wl AUR package. I can confirm that 802.11n works. I am connected right now at 324Mbps (3 .11n spatial streams). I have not tried 802.11ac yet. I will soon, so I will report back.
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For reference:
$ lspci -vnn | grep Network
03:00.0 Network controller [0280]: Broadcom Corporation BCM4360 802.11ac Wireless Network Adapter [14e4:43a0] (rev 03)
According to kernel.org, BCM4360 could be either 14e4:4360 or 14e4:43a0
Last edited by jumperpunk (2014-07-30 17:09:43)

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