Reply To: ASUS – DSL-AC88U / DSL-AC3100 Firmwares (beta's) etc. Looks like a new Beta Release for the DSL-AC88U is available, this version has Telnet enabled and improved 2.4GHz wifi (I believe). DSL-AC88U_v9.10.06_build581_debug.w.zip https://www.asuswebstorage.com/navigate/s/604D61534F2541D1B3CE1CC031A697E4Y UK Sentinel In a completely…

[Grisu]

sorry I dont get all this together.

Annex A or B are only how much in the lower frequency range are left for POTS (about 10kHz) with Annex_A or approx. 128-200MHz for ISDN with Annex_B.

You can use even Annex B on a POTS if supported by operator, you will only loose some more bytes speed as this lower spectrum wont be used for ADSL.

Using Annex A on an ISDN will brake ISDN as the same range is used by both services ISDN and ADSL.

And there are some more differences as the spectrum is devided in slightly different slots.

I had ISDN and Annex_B many years ago, but now on POTS with Annex A.

AND I can change setting from A to B and today on my fast ~280Mb/s v-plus line wont see any difference and both are working on my line – I tested it and in the snapshot randomly B has been even faster some Mb. If it works or not may be dependent on operator to support both. On slower lines you may see about 1Mb/s slower speeds with Annex B.

In Germany they only used Annex_B as most have been on ISDN, different in other countries where only ISDN lines used Annex_B and the rest Annex_A. Modems supported both 20 years ago, but may me limited to only one in firmware and on provider side. So modems sold in Germany often has been fixed on B and same modem sold anywhere else had the option to change or autodedect Annex-mode.

So I dont understand why in BG on lines not using ISDN they use little slower Annex B.

For sure you all know how to do practically in GB, just courious that it is like it is from theoretical aspect ;-)

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