Just switched from comcast cable to AT&T fiber optic. CBR40 router only has a coax input. How can I get the fiber optic signal into the CBR40 router? Is the a coax to fiber optic converter? Alternatively, I tried to CAT5 out from the AT&T router to the CBR40 router did not work. Also tried to CAT5 to an Orbi RBS50 and RBS20 satellite. Unsuccessful as well. The AT&T router is BGW320-505. It is not branded. Thanks!

Please post about this over in the Orbi with cable modem forum:https://community.netgear.com/t5/Orbi-with-Built-in-Cable-Modem/bd-p/en-home-orbi-cable These are two different ISP platforms that are not interchangeable. So you can't use the CBK40 system on a FIber ISP platform. You should return the CBK40 and get a Orbi RBK system with out the cable modem built in. Good Luck.

Yes. CAT6 would be recommended and best. CAT5 is older and doesn't support 1000Mbps connection rates well.

Thanks! Do i connect the RBK via a CAT5 from the AT&T router to the RBK??

Connect Orbi CBR40 router to fiber optic cable

7 Replies

FURRYe38
Guru
Jan 27, 2021
Please post about this over in the Orbi with cable modem forum:
https://community.netgear.com/t5/Orbi-with-Built-in-Cable-Modem/bd-p/en-home-orbi-cable

These are two different ISP platforms that are not interchangeable. So you can't use the CBK40 system on a FIber ISP platform. You should return the CBK40 and get a Orbi RBK system with out the cable modem built in.

Good Luck.
- RonSwanson
  Aspirant
  Jan 27, 2021
  Thanks! Do i connect the RBK via a CAT5 from the AT&T router to the RBK??
  - FURRYe38
    Guru
    Jan 27, 2021
    Yes. CAT6 would be recommended and best. CAT5 is older and doesn't support 1000Mbps connection rates well.

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Connect Orbi CBR40 router to fiber optic cable