[vdr] Re: LAN cable length / Streaming Plug-In

[Jörg Knitter <joerg.knitter@gmx.de>]

> >> That is simple to verify; your're obviously running linux, right ?
;-)
> >> So, look at the lines from 'ifconfig' (as root) for the
ethernetcard.
> >> These look somewhat like this:
> >>
> >> eth0      Link encap:Ethernet  HWaddr 00:E0:7D:B6:2C:6B
> >>           inet addr:10.0.0.1  Bcast:10.0.0.255  Mask:255.255.255.0
> >>           UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
> >>           RX packets:218423148 errors:0 dropped:0 overruns:0
frame:0
> >>           TX packets:374519874 errors:0 dropped:0 overruns:0
carrier:0
> >>           collisions:0 txqueuelen:100
> >>           RX bytes:4056969579 (3869.0 Mb)  TX bytes:4168451818
(3975.3
> >Mb)
> >>           Interrupt:9 Base address:0x1f00
> 
> Mine looks kinda like this:
> 
> eth0      Link encap:Ethernet  HWaddr 00:E0:7D:BD:E5:52
>           inet addr:192.168.1.3  Bcast:192.168.1.255
> Mask:255.255.255.0
>           inet6 addr: fe80::2e0:7dff:febd:e552/10 Scope:Link
>           UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
>           RX packets:34345703 errors:0 dropped:0 overruns:0 frame:1306
>           TX packets:23959895 errors:2 dropped:0 overruns:0 carrier:2
>           collisions:0 txqueuelen:100
>           RX bytes:2469905828 (2355.4 Mb)  TX bytes:4219703590 (4024.2
> Mb)
>           Interrupt:10 Base address:0x3000 Memory:de000000-de000154

Hi,

I did some tests at home at weekend. From WinXP to WinXP I was able to
copy 3 GByte of Data in around 10 minutes, so it is not a thing of
performance - but on signal quality that causes blocks when using the
streaming plugin. As I heard from friends, UDP nearly has no error
correction, so I believe that I often lose packages. When using a hub
directly after a wall socket for the last 20m of cable (of 50m), the
signal gets nearly perfect.
Additionally, I checked if I use really ISDN wall sockets or LAN sockets
as a lot of people told me that if I had to screw the network cable, it
would be an ISDN wall socket. But I looked at the package and it clearly
says LAN socket CAT6, although the cables are connected with screws.
So I still really wonder why signal quality gets so bad after 50m. Are
CAT6 network sockets with screws worse than those other sockets? Or do I
expect too much from the UDP protocol?

With kind regards

Jörg



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