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Forum Discussion
RBR750 WAN port pins "pair D" not functional
I am running an RBR750 with single RBS750 on firmware v7.2.7.15_5.1.16 and just upgraded to USInternet 1 Gigabit fiber. After the installation I connected the Orbi to the fiber modem via Cat6 patch cable through the yellow WAN port.
When running a speed test, either through speedtest.net (laptop wired ethernet or wireless to Orbi) or through the Orbi web browser administration page (ADVANCED>Setup>Speed Test) I am getting about 95 Mbps upload and download in each of those configurations.
When running the speed test with my laptop connected directly to the fiber modem with the same Cat6 cable, I get 962 Mbps.
I connected my old Nighthawk N750 to the fiber modem with the Cat6 cable, and with the laptop wired to an ethernet LAN port I got 297 Mbps, and wireless 142 Mbps.
I reconnected the Orbi RBR750 and contacted the USInternet tech support, and their cable diagnostic reported that "pair D" is bad and suggested replacing the ethernet cable. As the cable is fully functional, there is a problem with the RBR750 WAN port.
Looking at the WAN port, all 6 pins look intact without any damage, corrosion, bend or deviation.
Is there some software setting I am missing that is disabling pair D in the WAN port? Or is this some physical issue with the RBR750 itself?
Through all my research it does not seem I can bypass the WAN port to use the RBR750 in AP mode and the N750 as my router, as the ethernet cable still needs to go through the WAN port on the RBR750. Is there any way to use one of the LAN ethernet ports to connect the RBR750 (as the mesh wireless network) to the N750 (wireless disabled) that I am missing?
4 Replies
For T-568B, the "D" pair is the brown wire and brown/white wire. (pins 7 & 8 on the RJ45 jack).
With two Ethernet cables showing the same behavior, the RBR750 appears to be busted. The warranty was one year and it appears to have lasted three years.
What is Pair D? Not sure if thats a valid term or description. Never heard that said before.
Brand and model# of ISP modem?
Recommend CAT6 UTP between the modem/ONT and the RBR.
What speeds are you paying for UP and DOWN from the ISP?
Is Armor, SPC or IPv6 enabled or disabled on the RBR?
Had a factory reset and setup from scratch been performed.
I would not use a N750 router. Would be old tech and not as good as the RBR as a router. There a brand and model# of this N750 router? Is this a DSL router or stand alone router?
Ethernet speed negotiation is built into the Ethernet hardware. There is no software feature on the RBR750 to manage any of the Ethernet pairs.
If there is another Ethernet cable lying around (I have dozens), it might be worth trying swapping the cables. Even though the pins appear "ok", perhaps inserting that particular cable causes one of the pins to not make contact.
If the RBR750 is new, I'd return it as being defective.
The Cat6 cable gives the 962 Mbps on the laptop direct to the fiber modem, as does a Cat5e. Both cables only give 95Mpbs to the Orbi. It's about 3 years old, and I won't likely be giving more money to Netgear for a replacement if this is an actual hardware malfunction
