Problems with 1621

[Henry]

Execuse me for writing in English, but my written German is not that good. I can speak and read it so any answers may come in German.

I have the following problem: since our ADSL-line got upgraded to 1Mb/8Mb the router disconnects this line every 2 or 3 minutes. Until I have figured out what is causing the problem I want to use our old Speedtouch to make the ADSL-connection and use the Lancom as a firewall/dhcp-server/router etc. So the situation is as follows:

LAN -> Lancom -> Speedtouch -> ADSL

Is this possible and how do I setup the Lancom and connect things?
Or has anyone an solution to the disconnect-problem?

Thanks in advance.

Henry

[COMCARGRU]

Moin,

du mußt das DSLoL Interface des Lancom benutzen und das Speedtouch an einen der Switchports des 1621 anschließen...

Gruß
COMCARGRU

[Henry]

Hallo COMCARGRU,

Vielen dank für deine antwort, und wie mache ich daß?

Gruß

Henry

[COMCARGRU]

Wenn du den Setup Assistent benutzt, einfach bei Interface DSLoL auswählen. Dann benutzt das Lancom ein an den Switch angeschlossenes Modem für den Zugang. Der Rest sollte eigentlich identisch sein...

Mal abgesehen davon, daß diese Kombi zumindest theoretisch etwas unsicher ist...

Gruß
COMCARGRU

[MoinMoin]

Moin Henry!

since our ADSL-line got upgraded to 1Mb/8Mb the router disconnects this line every 2 or 3 minutes.

Can you please provide me with some more information? The 1621 should be able to work on a full rate ADSL line. At first I would like to see the ADSL status /status/adsl.


Ciao, Georg

[Henry]

Hello MoinMoin,

From our local Dutch distributer I learned that these problems can be due to the C-hardware release. He advised to trade the router in for a E3 or F3 release.

Here's the data you requested:

Modem Status INFO: SHOWTIME
Line Type INFO: ADSL_over_ISDN
ADSL-Standard INFO: G.992.1_(G.Dmt)
Upstream rate (kbps) INFO: 576
Downstream rate (kbps) INFO: 7232
Local SNR (dB) INFO: 6.0
Remote SNR (dB) INFO: 3.0
Local attenuation (dB) INFO: 33.5
Remote attenuation (dB) INFO: 18.0
Interleave upstream INFO: 1
Interleave downstream INFO: 1
Remote vendor ID INFO: Alcatel
Linecode version INFO: U74.4.6
Conn.-statistics TABINFO: 10 x [Conn.-start,ADSL-Standard,..]
DS-bits-per-bin TABINFO: 26 x [Index,x0,x1,x2,x3,x4,x5,x6,x7,x8,x9]
US-bits-per-bin TABINFO: 7 x [Index,x0,x1,x2,x3,x4,x5,x6,x7,x8,x9]
SNR-local-per-bin TABINFO: 26 x [Index,x0,x1,x2,x3,x4,x5,x6,x7,x8,x9]
Retrain ACTION:
Reset DSP ACTION:

Greetings,

Henry

[MoinMoin]

Moin Henry!

From our local Dutch distributer I learned that these problems can be due to the C-hardware release. He advised to trade the router in for a E3 or F3 release.

I would say he is right. The layout has been changed for release D for better reach. So the releases D or newer will work better.

Upstream rate (kbps) INFO: 576
Downstream rate (kbps) INFO: 7232
Local SNR (dB) INFO: 6.0
Remote SNR (dB) INFO: 3.0
Linecode version INFO: U74.4.6

The upstream rate is far below one megabit and 3dB for the upstream is the absolute minimum. A little change in the line characteristics and you will loose the connection. You should try a newer release. And please let me have another look at the ADSL statistics with it. I have never seen a full rate ADSL outside our laboratory.


Ciao, Georg

[Henry]

Hello Georg,

Our distributer traded in the old device for a new one (without costs), hardware release F3.
And here are the results:

Modem Status INFO: SHOWTIME
Line Type INFO: ADSL_over_ISDN
ADSL-Standard INFO: G.992.1_(G.Dmt)
Upstream rate (kbps) INFO: 576
Downstream rate (kbps) INFO: 8000
Local SNR (dB) INFO: 6.5
Remote SNR (dB) INFO: 3.5
Local attenuation (dB) INFO: 33.0
Remote attenuation (dB) INFO: 19.0
Interleave upstream INFO: 1
Interleave downstream INFO: 1
Remote vendor ID INFO: Alcatel
Linecode version INFO: U74.4.6
Conn.-statistics TABINFO: 10 x [Conn.-start,ADSL-Standard,..]
DS-bits-per-bin TABINFO: 26 x [Index,x0,x1,x2,x3,x4,x5,x6,x7,x8,x9]
US-bits-per-bin TABINFO: 7 x [Index,x0,x1,x2,x3,x4,x5,x6,x7,x8,x9]
SNR-local-per-bin TABINFO: 26 x [Index,x0,x1,x2,x3,x4,x5,x6,x7,x8,x9]
Retrain ACTION:
Reset DSP ACTION:

We still got a bad upstream rate, but downstream is 8 Mb. I think you can interpret these figures better than I can.

Regards,

Henry

[MoinMoin]

Hi Henry!

Our distributer traded in the old device for a new one (without costs), hardware release F3.
...
We still got a bad upstream rate, but downstream is 8 Mb.

Well, one step nearer but still far away. I think, you expected a bit more. Is the connection now stable? Can you please give me a dump of the US bits per bin and the SNR tabels?

Until I have figured out what is causing the problem I want to use our old Speedtouch to make the ADSL-connection and use the Lancom as a firewall/dhcp-server/router etc.

Which protocol are you using on the WAN side? PPPoE will be no problem when using an external modem and DSLoL. For plain IP or IP with DHCP you should use the private mode of the switch - and will have to connect another switch for your LAN. If you don't get a acceptable ADSL connection via the build in modem, you should try to get a device with ethernet WAN port for your external modem.

Ciao, Georg

[Henry]

Hello Georg,

Thanks for the firmware update but I can't see any changes in the line characteristics. The line was stable until I moved the Lancom to a place closer to the ISDN-splitter. After that the connection got unstable. I have moved the device back to my desk and now it's connected for 2 hours already. I have the following charcteristics:

Code: Alles auswählen

Modem Status             INFO:    SHOWTIME
Line Type                INFO:    ADSL_over_ISDN
ADSL-Standard            INFO:    Alcatel
Upstream rate (kbps)     INFO:    704
Downstream rate (kbps)   INFO:    8000
Local SNR (dB)           INFO:    9.0
Remote SNR (dB)          INFO:    3.0
Local attenuation (dB)   INFO:    33.5
Remote attenuation (dB)  INFO:    17.0
Interleave upstream      INFO:    1
Interleave downstream    INFO:    1
Remote vendor ID         INFO:    00 22
Linecode version         INFO:    U74.5.5

Yes, the upload has increased  :D 

US bits per bin:

Index  x0  x1  x2  x3  x4  x5  x6  x7  x8  x9
---------------------------------------------
 0x    0   0   0   0   0   0   0   0   0   0 
 1x    0   0   0   0   0   0   0   0   0   0 
 2x    0   0   0   0   0   0   0   0   0   7 
 3x    7   8   9   10  10  11  11  11  11  11
 4x    11  11  10  10  10  10  10  10  10  0 
 5x    0   0   0   0   0   0   0   0   0   0 
 6x    0   0   0   0                         

SNR

Index  x0     x1     x2     x3     x4     x5     x6     x7     x8     x9   
---------------------------------------------------------------------------
 0x                                                                        
 1x                                                                        
 2x                                                                        
 3x                                                                        
 4x                                                                        
 5x                                                                        
 6x                                  2.5    2.0    2.5    2.5    2.5    2.5
 7x      2.5    3.0    2.5    2.0    2.0    2.0    2.0    3.0    3.0    3.0
 8x      3.0    2.5    3.5    2.0    3.5    2.5    2.5    2.5    3.5    3.5
 9x      3.5    3.5    2.5    3.5    3.5    3.5           3.0    3.5    3.0
10x      3.0    3.5    2.5    2.0    3.5    3.0    3.0    2.5    2.5    4.0
11x      2.5    3.0    2.0    3.0    3.0    3.0    3.5    2.5    3.5    3.0
12x      3.0    3.0    3.0    3.0    3.5    2.5    3.0    3.5    3.5    2.5
13x      3.0    3.5    3.0    3.0    3.5    3.0    2.5    2.5    3.5    3.0
14x      3.5    3.5    3.0    3.5    2.5    4.0    2.5    3.5    3.0    3.0
15x      3.0    3.5    3.0    2.5    3.5    3.5    3.0    3.5    3.0    2.5
16x      3.5    2.5    2.0    2.5    3.0    3.0    3.0    2.5    3.0    2.0
17x      3.0    2.0    2.0    1.0    1.5    1.5    3.0    2.5    2.0    2.5
18x      2.5    3.0    3.0    4.0    3.0    3.0    3.0    3.0    3.0    3.0
19x      3.0    3.5    4.0    3.5    3.5    3.0    4.0    3.5    3.0    3.0
20x      3.0    3.0    3.0    3.0    3.0    3.0    3.0    3.0    3.5    3.5
21x      3.5    3.5    3.0    3.0    3.0    3.0    3.0    3.5    3.5    3.0
22x      3.0    2.5    3.5    3.5    3.5    2.5    2.5    2.5    3.0    3.0
23x      3.0    3.0    2.5    2.5    3.5    2.5    3.0    3.0    3.0    3.0
24x      3.0    2.5    3.5    3.0    2.0    3.5    2.5    3.0    2.5    3.5
25x      3.0    3.0    5.0    5.0    2.5    3.0                    

Thanks,

Henry

[MoinMoin]

Hi Henry!

ADSL-Standard INFO: Alcatel

That's strange. I didn't expect this to work anymore. Well, that's MULTIMODE. What happens if you set the linecode fixed to G.992.1?

Code: Alles auswählen

US bits per bin:

Index  x0  x1  x2  x3  x4  x5  x6  x7  x8  x9
---------------------------------------------
 0x    0   0   0   0   0   0   0   0   0   0 
 1x    0   0   0   0   0   0   0   0   0   0 
 2x    0   0   0   0   0   0   0   0   0   7 
 3x    7   8   9   10  10  11  11  11  11  11
 4x    11  11  10  10  10  10  10  10  10  0 
 5x    0   0   0   0   0   0   0   0   0   0 
 6x    0   0   0   0                         

Maybe here is the problem (but maybe it is only because of ALCATEL linecode?). ANNEX-B should start at bin 32 and end at bin 63. There are 15 unused bins which should be enough for the missing 300 kilobit. On the other hand the bins below 32 should not have been used at all. Same with G.992.1? Then you should contact your provider and ask, if he has limited the usable upstream bins.

Ciao, Georg

[Henry]

Hello Georg,

Thanks for the quick response. I have set the linecode to G.992.1 and the connection seems stable. Upstream however has dropped to 640 kBit/s.

These are the figures:

Code: Alles auswählen

Modem Status             INFO:    SHOWTIME
Line Type                INFO:    ADSL_over_ISDN
ADSL-Standard            INFO:    G.992.1_(G.Dmt)
Upstream rate (kbps)     INFO:    640
Downstream rate (kbps)   INFO:    8000
Local SNR (dB)           INFO:    8.0
Remote SNR (dB)          INFO:    3.0
Local attenuation (dB)   INFO:    33.5
Remote attenuation (dB)  INFO:    19.0
Interleave upstream      INFO:    1
Interleave downstream    INFO:    1
Remote vendor ID         INFO:    Alcatel
Linecode version         INFO:    U74.5.5

US bits per bin:

Index  x0  x1  x2  x3  x4  x5  x6  x7  x8  x9
---------------------------------------------
 0x    0   0   0   0   0   0   0   0   0   0 
 1x    0   0   0   0   0   0   0   0   0   0 
 2x    0   0   0   0   0   0   0   0   0   4 
 3x    5   7   7   8   8   8   9   8   9   8 
 4x    8   8   8   8   8   8   8   8   8   8 
 5x    8   8   7   0   0   0   0   0   0   0 
 6x    0   0   0   0                         

I have forwarded your remarks to our provider (xs4all) and am waiting for their reply.

Thanks for the support,

Henry

[Henry]

Hi Georg,

I have some figures of the comparison between the two different firmware versions:

4.03:

Code: Alles auswählen

ADSL-Standard            INFO:    G.992.1_(G.Dmt)
Upstream rate (kbps)     INFO:    576
Downstream rate (kbps)   INFO:    8000
Local SNR (dB)           INFO:    7.0
Remote SNR (dB)          INFO:    3.0
Local attenuation (dB)   INFO:    33.5
Remote attenuation (dB)  INFO:    19.0
Interleave upstream      INFO:    1
Interleave downstream    INFO:    1
Remote vendor ID         INFO:    Alcatel
Linecode version         INFO:    U74.4.6

Index  x0  x1  x2  x3  x4  x5  x6  x7  x8  x9
---------------------------------------------
 0x    0   0   0   0   0   0   0   0   0   0 
 1x    0   0   0   0   0   0   0   0   0   0 
 2x    0   0   0   0   0   0   0   0   0   6 
 3x    7   9   9   9   10  9   9   9   9   8 
 4x    8   8   8   8   8   8   8   8   8   0 
 5x    0   0   0   0   0   0   0   0   0   0 
 6x    0   0   0   0                         

4.13:

Code: Alles auswählen

ADSL-Standard            INFO:    G.992.1_(G.Dmt)
Upstream rate (kbps)     INFO:    640
Downstream rate (kbps)   INFO:    8000
Local SNR (dB)           INFO:    7.0
Remote SNR (dB)          INFO:    3.0
Local attenuation (dB)   INFO:    33.0
Remote attenuation (dB)  INFO:    19.0
Interleave upstream      INFO:    1
Interleave downstream    INFO:    1
Remote vendor ID         INFO:    Alcatel
Linecode version         INFO:    U74.5.5

Index  x0  x1  x2  x3  x4  x5  x6  x7  x8  x9
---------------------------------------------
 0x    0   0   0   0   0   0   0   0   0   0 
 1x    0   0   0   0   0   0   0   0   0   0 
 2x    0   0   0   0   0   0   0   0   0   4 
 3x    5   7   7   8   8   8   9   9   9   8 
 4x    8   8   8   8   8   8   8   8   8   8 
 5x    8   7   7   0   0   0   0   0   0   0 
 6x    0   0   0   0                         

Regards,

Henry