Thankyou for your help TheParasol, you were close to the solution and have you have give me a good track ...
In fact as a newbie, when i installed Oscam on my DM500/DM800, i just duplicated a configuration a friend have created for me without trying to touch sensitive settings like card frequencies, i had checked on forums if the Bis reader settings was correct, but no more...
And in fact to make my Bis.Tv card recognized i have set :
Mhz = (i removed the setting to let Oscam choose for me) and Oscam have set :
Mhz = 450
For Cardmhz, i just have set like in the webif Cardmhz description recommanded setting for Dreambox Mipsel = 2700 :
Cardmhz = 2700
So if someone need those settings, they are working good (i think - but i'm not a specialist - i still haven't understood why we should enter those two settings... as the newbie i am)
here is the oscam cardreader log after i changed the settings to the good one
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>> OSCam << cardserver started at Sun Feb 9 17:05:25 2014
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2014/02/09 17:05:25 0 s >> OSCam << cardserver started, version 1.20-unstable_svn, build r9524 (mipsel-newnigma2-linux-gnu)
2014/02/09 17:05:25 0 s creating pidfile /tmp/.oscam/oscam.pid with pid 18445
2014/02/09 17:05:25 0 s services reloaded: 0 services freed, 65 services loaded, rejected 0
2014/02/09 17:05:25 0 s userdb reloaded: 52 accounts loaded, 0 expired, 51 disabled
2014/02/09 17:05:25 0 s signal handling initialized
2014/02/09 17:05:25 0 s 132 service-id's loaded in 6ms
2014/02/09 17:05:25 0 s 986 provid's loaded
2014/02/09 17:05:25 0 s cccam: initialized (fd=6, port=31855)
2014/02/09 17:05:25 0 s bis [internal] creating thread for device /dev/sci0
2014/02/09 17:05:25 2AF00480 h webif: decompressed 72428 bytes back into 201640 bytes
2014/02/09 17:05:25 2AF00480 h HTTP Server running. ip=0.0.0.0 port=16002
2014/02/09 17:05:25 5BF6C0 r bis [internal] Reader initialized (device=/dev/sci0, detect=cd, pll max=27.00 MHz, wanted mhz=4.50 MHz
2014/02/09 17:05:26 5BF6C0 r bis [internal] card detected
2014/02/09 17:05:27 0 s anti cascading disabled
2014/02/09 17:05:27 8A3A48 c plain dvbapi-client granted (anonymous, au=off)
2014/02/09 17:05:27 8A3A48 c [DVBAPI] Detected /dev/dvb/adapter0/demux0 Api: 0, userconfig boxtype: 1
2014/02/09 17:05:27 5BF6C0 r bis [internal] ATR: 3F 77 18 00 00 C2 EB 41 02 6C 90 00
2014/02/09 17:05:27 5BF6C0 r bis [internal] Init card protocol T0, FI=1, F=372, D=12, N=0
2014/02/09 17:05:27 5BF6C0 r bis [internal] TEST tempo mhz check = 500 mhz
2014/02/09 17:05:27 5BF6C0 r bis [internal] Calculated work ETU is 6.89 us reader mhz = 450
2014/02/09 17:05:27 5BF6C0 r bis [internal] PLL Reader: ATR Fsmax is 5 MHz, clocking card to 4.50 Mhz (nearest possible mhz specified reader->cardmhz)
2014/02/09 17:05:29 5BF6C0 r bis [internal] using ecm #70e for long viaccess ecm
2014/02/09 17:05:29 5BF6C0 r bis [internal] type: Viaccess (non-standard atr), caid: 0500, serial: ##########
2014/02/09 17:05:29 5BF6C0 r bis [internal] providers: 3 (FFF400,042820,042830)
2014/02/09 17:05:29 5BF6C0 r bis [internal] ready for requests
2014/02/09 17:05:29 5BF6C0 r bis [internal] found card system viaccess
2014/02/09 17:05:29 5BF6C0 r bis [viaccess] THIS WAS A SUCCESFULL START ATTEMPT No 1 out of max alloted of 1
2014/02/09 17:05:29 5BF6C0 r bis [viaccess] card detected
2014/02/09 17:05:29 5BF6C0 r bis [viaccess] serial: ##########
2014/02/09 17:05:29 5BF6C0 r bis [viaccess] provider: 1, id: ####################, sa: ########, geo: empty
2014/02/09 17:05:30 5BF6C0 r bis [viaccess] provider: 2, id: ###################, sa: ########, geo: 00 00 01 00
2014/02/09 17:05:30 5BF6C0 r bis [viaccess] class: 21, expiry date: 2014/01/16 - 2015/01/15
2014/02/09 17:05:30 5BF6C0 r bis [viaccess] provider: 3, id: ###################, sa: ########, geo: FF FF FF FF
2014/02/09 17:06:03 2AF00480 h all debug_level=65535
2014/02/09 17:06:03 2AF00480 h WebIf: Origin checked. Result: access from 192.168.2.4 => allowed
2014/02/09 17:06:03 5BF6C0 r bis [viaccess] cardreader_do_checkhealth: reader->card_status = 2, ret = 1
2014/02/09 17:06:04 5BF6C0 r bis [viaccess] cardreader_do_checkhealth: reader->card_status = 2, ret = 1
2014/02/09 17:06:05 2AF00480 h WebIf: Origin checked. Result: access from 192.168.2.4 => allowed
2014/02/09 17:06:05 5BF6C0 r bis [viaccess] cardreader_do_checkhealth: reader->card_status = 2, ret = 1
2014/02/09 17:06:06 5BF6C0 r bis [viaccess] cardreader_do_checkhealth: reader->card_status = 2, ret = 1
This, checkhealth line in log, i have never seen before, i think it's a good sign isn't it ?
2014/02/09 17:06:03 5BF6C0 r bis [viaccess] cardreader_do_checkhealth: reader->card_status = 2, ret = 1
I'm not sure i have put good settings, but my Bis local is working now, if someone could check my log to confirm everything is ok, it would be helpful
In any case, i thank you