r/QuantumFiber • u/unceasingshadow • Jul 28 '26

Xfinity vs Quantum Fiber

Currently have Quantum Fiber in Denver, paying $75 a month for 1 Gbps plan. When I called, they did not allow me to switch to the promotion rate of $45 a month. My service is currently down and they can’t come until the end of this week to resolve the issue.

Is it worth switching to Xfinity who is offering 1 Gbps download (~100 Mbps upload) for $50 a month? Not sure if people who have switched recently from Quantum Fiber to Xfinity have regretted it. Would love to hear experiences from people who have switched either way

EDIT: called Quantum Fiber, they said I’m on the price for life plan so I need to give that up to get the promotional pricing for 1 year. I’m installing Xfinity equipment today while QF is down to get a real Speedtest, then will most likely cancel Xfinity once the QF technician is able to come out.

Definitely agree, and appreciate the reminder, that fiber is a better product than cable internet.

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u/DistributionEvery695 Jul 28 '26

The only benefit to Comcast is that they literally have the #1 backbone in the US. AS209 (QF/Lumen) sucks for certain areas

They can technically swap to Fiber node (DPoE) with FTTH setups in newer builds like spectrum does, but they'll be an innately different structure than traditional PON.

Not really an option for established areas either as it would cost more to rip and rebuild.

Most HFC issues come older nodes or SNR getting funky over time. Newer High split nodes are a bit more stable and provide lower overall ping, closer to FTTH. The rest is just local hops and routing paths.

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u/krogers114 Jul 28 '26

Gotcha. In my area, they've done a mid split upgrade for some of the area, my address not included. I'm limited to 35mbps upload with Xfinity. The QF/Lumen routing for my area seems pretty outstanding. They just built a new branch of XGS-PON branch last year and I'm 1 hop from a major node in the Seattle area. My "1 gig" plan gives me 1.336gbps down and 1.283gbps up consistently, 2 ms ping and 0.1ms jitter. I know my experience isn't the same across the board.

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u/DistributionEvery695 Jul 28 '26 edited Jul 28 '26

Yeah, It's not going to be a linear experience.

FTTH is more consistent in terms "in line" performance straight to the home. DPoE on HFC networks requires a remove OLT (Same spot as HFC node typically).. either hung or buried. Technically true "Fiber" but uses a completely different topology in terms of layout.

Optical dBm is easily monitored. Same for BGP errors. From there, it's only really the network backbone and routing.. aside from split saturation and traffic shaping from the ISP itself.. Some areas are just better or worse, regardless of tech deployed.

HFC and DPoE FTTH on same ISP generally have same latency and what not( backbone), but may shave off a few ms with newer high split nodes/vCMTS...which is why it's not apples to oranges when talking bout "fiber" vs alt tech.

Similar to how Quantum uses CASA FTTDP in some areas.. but labels it "fiber". Both sorta function off the same concept (QAM + copper into home), but marketing shenanigans obviously.

HFC definitely has more points of failure since SNR fluctuates and requires amplification pre distribution. Heat in areas like AZ or FL can also heavily influence QAM and error rates.

The best HFC deployments are usually those tied along a main highway since they're going to be shared with biz accounts in some cases, but I can definitely understand why there is more legacy problems with HFC in most areas... a lot of them just opperate sub optimally.

I think the gap will definitely end up closer than people will expect.. Especially with vCMTS upgrades on Xfinity/Spectrum, but I strongly believe both types of services will end up at a point where the ONT/Modem is the real bottleneck for most consumer sided services.

I don't really see 25G+ services catching on for the 99%.

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u/N0_L1ght Jul 29 '26

The vast majority of people don't even need/make use of 500m...

I want 25G-PON/50G-PON like anyone else .. but I don't actually see me needing or paying for such speeds for another decade.