Hi,

At the Wimborne Model Town we have chosen to communicate data between 
Raspberry Pis using Ethernet and, (as previously discussed), we've installed 
around 100 m of armoured Cat 5e cable around the site.

We are mainly using Raspberry Pi Zeros (because they are cheap) and during our 
prototype development we initially used a pair of adaptors similar to these:

https://www.ebay.co.uk/itm/Hot-Micro-USB-to-Network-LAN-Ethernet-RJ45-Adapter-3-Port-USB-2-0-HUB-Adapter/252846835224?hash=item3aded88618:g:
0W4AAOSwU8hY5fdh

However, we found that data throughput was dire, so we substituted a different 
adaptor at one end:

https://www.ebay.co.uk/itm/Ethernet-External-USB-to-Lan-RJ45-Network-Card-Adapter-10-100-Mbps-for-Laptop-PC/172597178384?
epid=506199648&hash=item282f97f010:g:p40AAOSwzgBY0Gdh

This solved the problem but needed a Micro USB to Type B USB adaptor to 
interface to the Pi Zero.

I now need to buy a lot more adaptors and have a couple of questions that I 
need to answer before I commit what might be quite a bit of the WMTs budget 
only to end up with the same problem as we had originally.

1.  The most important question is; does anyone know why this might have 
occurred?  The original adaptors were extremely cheap and included a USB hub, 
so they may simply have been badly designed.

2.  If I buy a bunch of the second type of adaptor (which is also cheap) how 
likely is it that we end up with the same problem.  (Is the problem the  no-
brand nature of the manufacturer?)

3.  If I buy a branded type, such as TP-Link, Belkin or Linksys, how likely is 
it that this problem is endemic to USB / Ethernet Adaptors?

I realise that without the answer to question 1, questions 2 and 3 become just 
guess work, but maybe one of you have come across this before?

-- 



                Terry Coles



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