If you’re using FTTC, then it might be that the B10A won’t be any better than some of the other modems such as the inferior B10D, because I’m told that the superiority of the B10A is in the modem department because if a posh input filter at the analog front end although ?I don’t know any details only what I have been told by other Kitz members. I am using extremely long and very very slow ADSL lines and so I need the posh modem. If your line is superb anyway the modem’s abilities might be irrelevant.
The other factor is the match between your modem and the kit at the other end. I got a superb improvement because my exchange DSLAMs are Broadcom too, same as this modem so they both speak a Broadcom-specific proprietary protocol called ‘PhyR’ for ADSL2, which gives hugely improved reliability and effectively more speed, because you can risk pushing the modems harder. It’s the same thing roughly as the G.INP standard protocol, both are link error correction systems that work by retransmissions of small parts of messages as needed, so no corrupted packets.
Other people have reported good things if they match modems with kit at the other end for other, unknown reasons. And it may not always be the case that Broadcom is best if you have the wrong kit at the far end, according to the grapevine. On the other hand, iirc, Kitz was skeptical about this matching thing though.
If someone could help me dig out the link to the firmware it will save me a job, or having to post it up myself.
We have some serious ZyXEL modem experts here. I am not one of them, am asking for advice about it all the time.