From: pa3gcu (ukg@toya.net.pl)
Date: Wed Oct 29 2003 - 18:56:30 EET
On Wednesday 29 October 2003 11:50, Øyvind Hanssen wrote:
> We are using a Baycom USCC card with DF9IC modem with
> a T7F radio. It works ok, but since the radio is not squelched
> there is a high number of rx interrupts and error rx packets.
>
> Also, some bad packets seems to slip through. Much garbage is
> seen in the mheard list.
>
> Is this normal? Is there a way to workaround this?
>
> 73 de LA7ECA
>
> The sccstat returns (for instance):
> speed : 9600 baud
> txdelay : 5
txd of 5 is rather on the short side, you could well do better with it set to
8 which should suit fine.
> persist : 64
> slottime : 8
> txtail : 8
> fulldup : 0
> waittime : 2
> mintime : 3 sec
> maxkeyup : 7 sec
> idletime : 3 sec
> maxdefer : 120 sec
> group : 0x00
> txoff : off
> softdcd : off
If you dont have a squelched radio why do you have softdcd off.?
Should it not be on otherwise the card will always be in a busy state as per
below, IF i remember correctly that is.
> Status:
>
> HDLC Z8530 Interrupts Buffers
> -----------------------------------------------------------------------
> Sent : 147746 RxOver : 0 RxInts : 30689899 Size : 384
^^^^^^^^^^^^
I played with buffersize a lot when i used a scc card (PA0HZP) i found that
defining the following was best. ( i am presuming one still needs to define
buffers in /etc/z8530drv.conf .
If it is not a option in that file then recompile scc.c with more buffers
defined.
/usr/src/linux/drivers/net/hamradio/scc.c
#define SCC_BUFSIZE 1024
> Received : 212184 TxUnder: 0 TxInts : 4982360 NoSpace : 0
> RxErrors : 1804229 ExInts : 7823901
> TxErrors : 0 SpInts : 1006105
> Tx State : busy
You will always get a lot of ints without a hardware squelch, every spec of
noise is an interrupt.
I had much the same problem with decoding at 4800 baud and a software dcd, too
many interrupts make bad performance.
However having said that i have not followed or used my scc card for a few
years now things may well have changed.
>
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-- If the Linux community is a bunch of theives because they try to imitate windows programs, then the Windows community is built on organized crime.Regards Richard terhi.victor@logonet.com http://people.zeelandnet.nl/pa3gcu/
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