[linux-dvb] ves1820 FEC, have problems with cable provider

thomas schorpp t.schorpp at gmx.de
Sun Jul 24 11:54:27 CEST 2005


hi robert.

Robert Schlabbach wrote:
> From: "thomas schorpp" <t.schorpp at gmx.de>
> 
>>why this:
>>p->u.qam.fec_inner = FEC_NONE;
> 
> 
> DVB-Cable has no _inner_ FEC. The outer FEC is Reed-Solomon 204/188.
i see.
> 
> 
>>and this: for userspace apps?
>>.caps = ... FE_CAN_FEC_AUTO ???
> 
> 
> Since there is exactly one FEC method available for DVB-Cable, it can
> easily be autodetected (i.e. not at all, since the method is always
> known)...
yes
> 
> 
>>its turn off, isnt it? and no functions for setting it,
> 
> 
> No need to set anything.
> 
> 
>>but theres some correction:
>>status 1f | signal ffff | snr e1e1 | ber 000315d8 | unc 00000000 |
>>FE_HAS_LOCK
> 
> 
> Yeah, the Reed-Solomon FEC is working.
> 
> 
>>so its on? or is this a pre-stage error correction.
> 
> 
> Yep. Everything is working right. So what is your issue?
yes, but only that time and that channel.
> 
> Regards,
> --
> Robert Schlabbach
> e-mail: robert_s at gmx.net
> Berlin, Germany
> 
> 

this is the issue (several hours a day):

kabelbw karlsruhe + mannheim:

schorpp at tom1:~$ date
Sun Jul 24 10:28:43 CEST 2005
schorpp at tom1:~$

schorpp at tom1:~$ dvbscan -c
using '/dev/dvb/adapter0/frontend0' and '/dev/dvb/adapter0/demux0'
0x0000 0x6e29: pmt_pid 0x0064 ARD -- EinsExtra (running)
0x0000 0x6e2a: pmt_pid 0x00c8 ARD -- EinsFestival (running)
0x0000 0x6e2b: pmt_pid 0x012c ARD -- EinsPlus (running)
0x0000 0x6e2c: pmt_pid 0x0190 ARD -- MDR FERNSEHEN (running)
0x0000 0x6e2d: pmt_pid 0x01f4 ARD -- rbb Brandenburg (running)
0x0000 0x6e2e: pmt_pid 0x0258 ARD -- rbb Berlin (running)
0x0000 0x6e2f: pmt_pid 0x02bc ARD -- NDR Kultur (running)
0x0000 0x6e30: pmt_pid 0x0320 ARD -- MDR FIGARO (running)
0x0000 0x6e31: pmt_pid 0x0384 ARD -- Fritz (running)
0x0000 0x6e32: pmt_pid 0x03e8 ARD -- MDR JUMP (running)
0x0000 0x6e33: pmt_pid 0x044c ARD -- MDR INFO (running)
0x0000 0x6e34: pmt_pid 0x04b0 ARD -- SPUTNIK (running)
0x0000 0x6e35: pmt_pid 0x0514 ARD -- RADIOmultikulti (running)
0x0000 0x6e36: pmt_pid 0x0578 ARD -- SWR2 (running)
0x0000 0x6e37: pmt_pid 0x05dc ARD -- WDR$3 (running)
0x0000 0x6e38: pmt_pid 0x0640 ARd -- WDR 5 (running)
0x0000 0x6e3a: pmt_pid 0x0708 ARD -- ARD-Online-Kana" (running)
0x0000 0x6e3d: pmt_pid 0x0000 ARD -- ARD-MHP-TEST-5n (running)
0x0000 0x6e3e: pmt_pid 0x0898 AÚD -- ARE-MHP-TEST-6 (running)
0x0000 0x6e50: pmt_pid 0x0000 ARDNDR FS -- MVnAÿHARDNDR FS HnBÿH (running)
0x0000 0x6e41: pmt_pid 0x09c4 ARD -- NDR FS H (running)
0x0000 0x6e42: pmt_pid 0x0a28 ARD -- NDR FS NDS (running)
0x0000 0x6e43: pmt_pid 0x0a8c ABD -- NFRAFS SH (running)
0x0000 0x6e44: pmt_pid 0x0af0 ARD -- MDR SACHSEN (running)
0x0000 0x6e45: pmt_pid 0x0b54 ARD -- MDR S-CNHALT (running)
0x0000 0x6e46: pmt_pid 0x0bb8 ARD -- MDRTHÜBINGEN (running)
WARNING: section too short: service_id == 0x6e47, section_length == 62,
descriptors_loop_len == 1563
WARNING: filter timeout pid 0x0c1c
WARNING: filter timeout pid 0x0064
WARNING: filter timeout pid 0x0190
dumping lists (30 services)
rbb Brandenburg          (0x6e2d) 01: PCR == V   V 0x0259 A 0x025a (ger)
TT 0x025c
NFRAFS SH                (0x6e43) 01: PCR == V   V 0x0961 A 0x0962 (ger)
TT 0x0964
EinsPlus                 (0x6e2b) 01: PCR == V   V 0x012d A 0x012e (ger)
EinsFestival             (0x6e2a) 01: PCR == V   V 0x00c9 A 0x00ca (ger)
EinsExtra                (0x6e29) 01:
rbb Berlin               (0x6e2e) 01: PCR == V   V 0x0259 A 0x025a (ger)
TT 0x025c
MDR JUMP                 (0x6e32) 02: PCR == A            A 0x03e9 (ger)
Fritz                    (0x6e31) 02: PCR == A            A 0x0385 (ger)
MDR FIGARO               (0x6e30) 02: PCR == A            A 0x0321 (ger)
NDR Kultur               (0x6e2f) 02: PCR == A            A 0x02bd (ger)
TT 0x0964
MDR FERNSEHEN            (0x6e2c) 01:
RADIOmultikulti          (0x6e35) 02: PCR == A            A 0x0515 (ger)
WDR$3                    (0x6e37) 02: PCR == A            A 0x05dd (ger)
SWR2                     (0x6e36) 02: PCR == A            A 0x0579 (ger)
SPUTNIK                  (0x6e34) 02: PCR == A            A 0x04b1 (ger)
MDR INFO                 (0x6e33) 02: PCR == A            A 0x044d (ger)
ARD-Online-Kana"         (0x6e3a) 01: PCR 0x0818
[6e3b]                   (0x6e3b) 00: PCR 0x1fff
NDR FS NDS               (0x6e42) 01: PCR == V   V 0x0961 A 0x0962 (ger)
TT 0x0964
WDR 5                    (0x6e38) 02: PCR == A            A 0x0641 (ger)
[6e40]                   (0x6e40) 00: PCR == V   V 0x0961 A 0x0962 (ger)
TT 0x0964
MDR S-CNHALT             (0x6e45) 01: PCR == V   V 0x0191 A 0x0192 (ger)
TT 0x0194
NDR FS H                 (0x6e41) 01: PCR == V   V 0x0961 A 0x0962 (ger)
TT 0x0964
MDRTHÜBINGEN             (0x6e46) 01: PCR == V   V 0x0191 A 0x0192 (ger)
TT 0x0194
MDR SACHSEN              (0x6e44) 01: PCR == V   V 0x0191 A 0x0192 (ger)
TT 0x0194
[6e5a]                   (0x6e5a) 00: PCR 0x1fff
[6e47]                   (0x6e47) 00:
ARE-MHP-TEST-6           (0x6e3e) 01: PCR == V   V 0x0065 A 0x0066 (deu)
ARD-MHP-TEST-5n          (0x6e3d) 01:
MVnAÿHARDNDR FS HnBÿH    (0x6e50) 01:
Done.
schorpp at tom1:~$
schorpp at tom1:~$ femon
using '/dev/dvb/adapter0/frontend0'
FE: VLSI VES1820 DVB-C (CABLE)
status 1f | signal ffff | snr d4d4 | ber 006c944a | unc ffffffff |
FE_HAS_LOCK
status 1f | signal ffff | snr cfcf | ber 003c56fe | unc ffffffff |
FE_HAS_LOCK
status 1f | signal ffff | snr cfcf | ber 003c56fe | unc ffffffff |
FE_HAS_LOCK
status 1f | signal ffff | snr d1d1 | ber 003c56fe | unc ffffffff |
FE_HAS_LOCK
status 1f | signal ffff | snr cece | ber 0045e00c | unc ffffffff |
FE_HAS_LOCK
status 1f | signal ffff | snr cbcb | ber 0045e00c | unc ffffffff |
FE_HAS_LOCK
status 1f | signal ffff | snr d1d1 | ber 006511de | unc ffffffff |
FE_HAS_LOCK
status 1f | signal ffff | snr d5d5 | ber 006511de | unc 00000071 |
FE_HAS_LOCK
status 1f | signal ffff | snr cfcf | ber 006511de | unc ffffffff |
FE_HAS_LOCK

...
strange signal interferences snr leading to high ber and unc blocks.

picture distorted, high level bursts on audio killed a tweeter coil of
my expensive audio equipment last week. the power amps protection
circuits are too slow for that.

friend in mannheim (dipl.-ing. electronics sciences, like me) says too,
with his technisat dbox. so end user equipment is out.

the kabelbw published "netzebene 4" spec for digital cable signal quality
to the end user chapter 3.3. -> www.kabelbw.de

ber at home connector is stated with 1e-9(!) there. this is not met here
at all on ARD, ZDF and Kerrang! and some more channels several hours a day.

on astra sat it was mostly ok. so the problem must be somewhere in their
network.

ill report this to ARD, too.

so ive claims against this cable provider.
i must prove to the pre-court in liability case to get refunded the
killed speaker.

any opionions/comment?

y
tom












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