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Arris DG3450A

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Arris DG3450A

I've got two questions, the current firmware is 01.01.132.sip.
when doing a scm phy, I noticed the ds snr is about 5 db lower than a Netgear cable modem. test setup, so no others to do apples and oranges with.
the return is 5-85Mhz, with sc Qams up to 42Mhz. remaining is used for ofdma.
I use Excentis (current release) to make modem file changes. the oid for upper diplex is different for the Netgear (no what Excentis uses)
and looks to be the same for Arris modem as well.
1. is there a newer firmware version available?
2. what string is needed to make the return 5-85Mhz instead of the default 5-42Mhz?

Currently, both modems side by side shows both with 32 sc Qams and 96Mhz ofdm. with ofdma configured for 42-85Mhz, only the Netgear modem is working with ofdma

Thank you