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Customer Review

15 of 18 people found the following review helpful
3.0 out of 5 stars Crippled to 10/100 Speeds !!!, 23 Jun. 2014
This review is from: Devolo dLAN 500 Duo Add-On Powerline Adapter, Easy Ethernet Access Through Your Powerline (500 Mbps, 2 LAN Ports, Small, Compact and Unobtrusive Design, PLC Adapter, Ethernet) - White (Accessory)
Whereas I am happy to state that this Powerline Adaptor easily distributes network and internet access around my home with a minimum of fuss, I am both shocked and annoyed to find out that the adaptor is crippled by an ethernet adaptor which is only 10/100mbps.

To explain, the DLAN 500 Powerline system creates a network within your electricity supply which is *theoretically capable* of transmitting data at 500mbps, but since the ethernet adaptor is only 10/100mbps, the maximum speed which the device will ever transmit data is only 100mbps. This is a bottleneck which can never be overcome.

The main reason I bought these devices was to backup to a NAS (network) drive. When the NAS is connected directly to my computer (gigabit connection), I easily reached transfer speeds of 36MB/sec. When connecting the NAS via the DLAN500 Powerline, I struggled to get 6MB/sec. That's about 1/6th of the speed.

6MB/sec is fine for downloading from the internet or streaming video to any of your devices around the home, but it is completely inadequate for backing up to a NAS!! A 1TB backup would take more than 2 days at this speed, rather than just 7 hours at the faster speed.

Why did Devolo create a device which was so crippled from the offset?

I now see that there are DLAN 650 devices starting to come out which have true gigabit connections, so these should correct the deficiencies of these DLAN 500 devices. It looks like I will have to spend more £££ to upgrade my network, but I should never have had to do this !!
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Showing 1-4 of 4 posts in this discussion
Initial post: 31 Jan 2015 11:48:00 GMT
Rug says:
Hi
Even 36mb is very slow for a 1000mb theoretical connection speed. With these things you only tend to get a percentage of what's maximum
Are you sure you don't have some other bottleneck somewhere?
Are you using Cat6 cables or better or Cat5?
Are you sure your all the ports are capable of gigabyte speeds?
Are you connecting it over the net because then you'll be restricted to the maximum by your provider?
There's something else wrong there.

In reply to an earlier post on 2 Jun 2015 13:03:27 BDT
Last edited by the author on 2 Jun 2015 14:02:56 BDT
J. Wolfe says:
No... 36MB is about what I would expect with my current hardware.
The final speed for file transfers depends on a combination of the motherboard, bus speed, network controller, and especially the hard drive itself.
There is an excellent article about this very subject on Tom's Hardware...
http://www.tomshardware.co.uk/gigabit-ethernet-bandwidth,review-31611.html

I'm not totally sure you have fully grasped the difference between Mb (megabit) and MB (megabyte), since you appear to have lumped the 36 & 1000 together apparently as the same units.
There are 8 bits in every Byte, so there are 8 megabits in every Megabyte.
The case of the 'B/b' is thus very important when specifying speeds.
I was mindful of this distinction in my original review.

To be specific...
A gigabit (1000Mb) connection has a maximum throughput of 1000 megabits per second.
Which is the same as (1000 / 8 =) 125MB Megabytes per second. So the maximum theoretical throughput of data via a gigabit connection is just 125MB per second. Obviously less than this in real life.

I get 36MB / second with my hardware over the network, but when the data is passing via the Devolo Powerline device, I only get 6MB / second.

Posted on 2 Dec 2015 16:35:11 GMT
Last edited by the author on 2 Dec 2015 16:46:37 GMT
B. King says:
That's pretty poor, thanks for the heads up. I was thinking of picking these up as they seemed a bargain price for models with 2 ports on them, then sell off the old units second hand. Currently have Devolo AV200 and Devolo AV500 mini units. Retiring an AV200 Three port Wifi unit and these looked like the perfect replacement as the wifi isn't needed, just multiple ports. But at only 10/100Mbps (fortunately the older AV500 mini units techical info says they do 10/100/1000) the transmission speed over the powerline seems like it would be a waste when it hits 100Mbps ethernet bottleneck. Guess I'll just stick with the AV500 mini units for fastest connection and switch one device to use wifi (although Playstation 3 only does 802.11B but is finally being replaced with a PS4 {802.11N mimo} now that the media capabilities are more equal).

Posted on 2 May 2016 13:07:41 BDT
Detjo says:
They are advertised as "Fast Ethernet" so 10/100Mbit should be obvious.
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