[swinog] Umstellung ADSL-Geschwindigkeit = Probleme mit ISDN-Splitter

[Zalaba, Mike]

Swisscom best�tigt Probleme mit Splittern und Microfiltern bei Speed-Update:   Dear BBCS customer   During the past couple of day's we have had a number issues with ADSL connections not running anymore after the migration from 600/100 to 1200/200 has been carried out. We are still analysing reason for the reported problems. We currently don't know the reason for the problems, however we would like to inform you about what we know so far and how to proceed in the meantime whilst we continue to investigate.   Actual status   It seems that splitters or filters are causing the problems. Mainly splitters (ISDN-Lines) seem to be affected. Basically splitters and filters are passive elements. We are not aware that any kind of electrical current could cause an issue with such an element. Therefore a possible explanation of this phenomenon could be: After the migration the modem has to synchronise to 1200/200 instead of 600/100. An ADSL-connection (especially ISDN-lines) is distance sensitive. The splitter, as well as the modem type may influence slightly the possible maximum bandwidth. With 600/100 a splitter worked perfectly but with the bandwidth increase some splitters may just not be able to synchronise anymore. This might be depending of the splitter type / version. - We currently can't see any tendencies. This means that the splitter is not really defective but just not able to cope with the doubled bandwidth.   Next steps:   We completed the migration process (600/100 --> 1200/200) on the DSLAMs today at 14h00 This means there is no risk that any more problems will occur from our side Next on the migration schedule are the business profiles, this migration will not start before we know the reasons for the migration problems. We continue our investigations and will keep you informed.   Feedback welcome   If you have similar problems with the migration, please report them to [EMAIL PROTECTED] (CC to your account manager) and supply the following details if possible: phone number of the affected line ISDN or POTS type of modem type of splitter / filter Some ISP's report no problems at all. Some ISP's report just a few (1-3) cases. One particular ISP reported 50 cases. We are thankful for the feedback helping us to quickly solve the issue.   Thanks for your collaboration   Best regards   Your BBCS Team �         -----Urspr�ngliche Nachricht----- Von: Zalaba, Mike Gesendet: Freitag, 6. Februar 2004 16:10 An: [EMAIL PROTECTED] Cc: SWISSCOM Wholesale ([EMAIL PROTECTED]) Betreff: Umstellung ADSL-Geschwindigkeit = Probleme mit ISDN-Splitter   Swisscom ist ja derzeit dabei, die neuen Geschwindigkeiten f�r die BBCS-ADSL-Anschl�sse zu erh�hen. Dabei ist es (wie schon beim letzten mal) bereits bei mehreren Kunden zu Besch�digungen der ISDN-Splitter gekommen. Es �ussert sich "ganz einfach" darin, das kein ADSL-Link mehr vorhanden ist (also das ADSL-LED nicht leuchtet bzw. kein ADSL-Link im Status des Routers bzw. Modems angezeigt wird).   Um dies zu �berpr�fen besteht die M�glichkeit, das ADSL-"Modem"-Kabel direkt an den U-Bus (also ohne den Splitter) anzuschliessen. Der ADSL-Splitter hat 3 Stecker, die in der Regel mit "Modem" (Leitung zum Router/Modem), "Line" (Leitung aus der "Wand") und "Phone" (Leitung zum ISDN-NT). Der Kunde kann also den Router/Modem DIREKT in der "Wand" einstecken (dann Funktioniert aber das Telefon des NT nicht mehr). Sollte dann das ADSL (nach einem aus/einschalten des Routers/Modems) laufen ist also der Splitter defekt und muss ersetzt werden.   Es kann nicht ausgeschlossen werden, das durch diese "Stormst�sse" (????) infolge der Geschwindigkeitsanpassung auch andere Komponenten wie der Router/Modem selber besch�digt werden k�nnen.   �berpr�fen Sie also im Falle einer ADSL-St�rungsmeldung eines Kunden ("pl�tzlich kein ADSL mehr") die Probleme in diese Richtung.     Mit freundlichen Gruessen yours sincerely   Mike Zalaba IT-Service Switzerland Direct    +41 1 455 81 35 Mobil    +41 79 420 22 88   Econophone AG Weststrasse 117 CH-8036 Z�rich Main     +41 1 455 81 11 Fax       +41 1 455 81 99