Kitz Forum

Broadband Related => Broadband Hardware => Topic started by: LittleEinstein on March 25, 2020, 12:18:53 PM

Title: What are the ZyXEL modems with Broadcom chipset?
Post by: LittleEinstein on March 25, 2020, 12:18:53 PM
I just registered in the forum. I'm from Turkey. ZyXEL doesn't answer the question due to company policies. List of ZyXEL modems sold in Turkey:


Which of these modems use the Broadcom chipset?
Title: Re: What are the ZyXEL modems with Broadcom chipset?
Post by: meritez on March 25, 2020, 01:21:02 PM
@LittleEinstein, welcome

Following have broadcom chipsets that I have used:

VMG1312-B10D
VMG1312-B10A

Title: Re: What are the ZyXEL modems with Broadcom chipset?
Post by: LittleEinstein on March 25, 2020, 01:46:29 PM
@LittleEinstein, welcome

Following have broadcom chipsets that I have used:

VMG1312-B10D
VMG1312-B10A

I use this modem: https://openwrt.org/toh/zyxel/vmg3312-b10b

Is this modem good? Would I better change the modem?
Title: Re: What are the ZyXEL modems with Broadcom chipset?
Post by: tubaman on March 25, 2020, 02:42:10 PM
VMG3925-B10B is Broadcom - BCM63168
Your VMG3312-B10B looks like it's Broadcom too, also using the BCM63168. It should be fine.
 :)
Title: Re: What are the ZyXEL modems with Broadcom chipset?
Post by: hushcoden on March 25, 2020, 07:28:49 PM
I'd go with VMG3925-B10B

A few members of this forum have tried it with very good results...
Title: Re: What are the ZyXEL modems with Broadcom chipset?
Post by: LittleEinstein on March 28, 2020, 12:44:26 PM
Thanks for your answers...
Title: Re: What are the ZyXEL modems with Broadcom chipset?
Post by: Alex Atkin UK on March 29, 2020, 12:38:58 AM
I'd go with VMG3925-B10B

A few members of this forum have tried it with very good results...

I wouldn't go that far, I think its universally accepted that the VMG1312-B10A is superior and even Lantiq can perform better if you have a really good ECI line. (my own experience compared to the VMG3925-B10B)

Sadly there isn't a "one size fits all" solution.
Title: Re: What are the ZyXEL modems with Broadcom chipset?
Post by: Weaver on March 29, 2020, 02:52:19 AM
Does the VMG3925-B10B have the good analog front end filter hardware that the VMG1312-B10A has and which the B10D lacks? See https://forum.kitz.co.uk/index.php/topic,24567.0.html
Title: Re: What are the ZyXEL modems with Broadcom chipset?
Post by: Alex Atkin UK on March 29, 2020, 04:27:06 AM
Does the VMG3925-B10B have the good analog front end filter hardware that the VMG1312-B10A has and which the B10D lacks? See https://forum.kitz.co.uk/index.php/topic,24567.0.html

I think it had been concluded that it does not.  If I ever find my spare I could possibly take a look.
Title: Re: What are the ZyXEL modems with Broadcom chipset?
Post by: tubaman on March 29, 2020, 11:14:35 AM
Does the VMG3925-B10B have the good analog front end filter hardware that the VMG1312-B10A has and which the B10D lacks? See https://forum.kitz.co.uk/index.php/topic,24567.0.html

Pretty sure that it doesn't. The known models with the filter are VMG1312-B10A, VMG8324-B10A and VMG8924-B10A, which are all of a similar age. Confusingly there is now a new version of the VMG8924, but I don't believe anyone here has opened one up yet to look at the circuitry.
 :)
Title: Re: What are the ZyXEL modems with Broadcom chipset?
Post by: Alex Atkin UK on March 29, 2020, 01:59:19 PM
Ah of course, the photos of the VMG3925-B10B are here: https://support.aa.net.uk/Category:ZyXEL_VMG3925_B10B
Title: Re: What are the ZyXEL modems with Broadcom chipset?
Post by: tubaman on March 29, 2020, 02:21:32 PM
I've circled what I believe to be the filter components of the VMG1312-B10A below. The VMG3925-B10A is underneath and it is clear that those components are not present.
Also of possible interest are the beefy capacitors on the power supply side of the 1312 that are much smaller on the 3925.
 :)