Optimum Speed Test

Optimum (owned by Altice USA) operates in one of the most competitive broadband markets in the country — New York, New Jersey, Connecticut, and parts of Texas. What makes Optimum a bit confusing is that they run two completely different networks side by side: the original cable (coax) network and the newer fibre-optic network. The experience on each is dramatically different, and a lot of customers do not realise which one they are actually on.

This speed test will show you exactly what your connection is delivering. The results — especially your upload speed — will immediately tell you whether you are on Fiber or Cable.

Optimum Plans: Fiber vs Cable

Here is the critical thing to understand: two customers can both have the "Optimum 1 Gig" plan and get completely different performance. It all depends on which network serves your address:

The dead giveaway: if your upload speed is 35 Mbps or less, you are on cable. If it matches your download speed, you are on fibre.

Understanding Your Speed Test Numbers

Download speed on both network types should be close to your plan speed when tested over Ethernet. On cable, evening congestion can pull it down since bandwidth is shared with neighbours on the same node. On fibre, speeds tend to be rock-solid regardless of time of day.

Upload speed is the big differentiator. Cable upload on Optimum is capped at 35-50 Mbps across all plans — from the 300 Mbps plan to the 1 Gig plan. If you work from home, do video calls, stream on Twitch, or back up to the cloud, this low upload can quietly bottleneck your experience. Fibre does not have this problem.

Ping (latency) on Optimum Fibre is fast — typically under 10 ms. Cable sits between 20-40 ms which is still fine for gaming and calls, just not as snappy. If your cable ping spikes above 80-100 ms during peak hours, the local node is likely congested.

Optimum Router Login & Management

One of Optimum's biggest frustrations: you cannot manage your router through a regular 192.168.1.1 page like most ISPs. Optimum's newer hardware is cloud-managed, meaning you have to go through their portal:

Gateway 6 Status Lights

Internet (Solid Green): Connected and online. Everything is working.

Internet (Blinking Green): Attempting to connect or bonding channels. Give it 5-10 minutes after a reboot.

Internet (Solid Red): Connection failed. Check the fibre jack or coax cable. If secure, it is likely an area outage.

Phone (Solid Green): VoIP phone service is active.

WiFi (Solid Green): Wireless is broadcasting.

WiFi (Off): WiFi has been disabled. Check router.optimum.net or the app to re-enable it.

Common Issues and Fixes

Upload speed stuck at 35 Mbps on a "1 Gig" plan

This trips up a lot of people. You are paying for 1 Gig, expecting symmetrical speeds, but upload is only 35 Mbps. That means you are on the cable network, not fibre. The download speeds are the same on paper, but the underlying technology is completely different. To get fast uploads, check if Optimum Fiber is available at your address and request an upgrade. It usually requires a new Gateway 6 and a fibre line to be installed.

Smart WiFi causing device issues

The Gateway 6 combines 2.4 GHz and 5 GHz into a single network name ("Smart WiFi") and automatically assigns devices to whichever band it thinks is best. In theory, this is convenient. In practice, it often puts IoT devices (smart plugs, cameras, doorbells) on the 5 GHz band, which they cannot handle — and they drop offline.

The frustrating part: the router.optimum.net portal may not let you split the bands yourself. You often have to call Optimum support and ask them to separate 2.4 GHz and 5 GHz into two different network names. It is a painless change once you get an agent to do it.

Double NAT when using your own router

If you plug your own router into the Gateway without enabling Bridge Mode, you end up with two devices both doing NAT — "double NAT." This can cause problems with gaming (strict NAT in Call of Duty, Fortnite), VPN connections that will not establish, and port forwarding that does not work.

To fix it, you need Bridge Mode, which turns the Gateway into a dumb pass-through:

1. Connect your personal router's WAN port to LAN Port 1 on the Gateway 6.
2. Call Optimum at 888-276-5255 or use live chat and ask them to "enable Bridge Mode on Port 1."
3. Once confirmed, reboot both devices — Gateway first, then your router.
4. Your router should now receive a public IP address directly.

Altice One WiFi performance is weak

The Altice One combines your cable box and WiFi router into a single device. It is a neat idea but the WiFi performance is middling — the antenna placement is constrained by the TV hardware. If you are getting weak signal or slow speeds far from the Altice One, consider requesting the Altice One Mini extender or using Bridge Mode with your own router.

Wired vs WiFi Testing

To determine if your issue is Optimum's network or your in-home WiFi, test both ways:

Wired (Ethernet): Plug a laptop into the Gateway 6 or Altice One with an Ethernet cable. On a 1 Gig Fiber plan, you should see around 940 Mbps down and 940 Mbps up. On a 1 Gig Cable plan, 940 Mbps down and 35-50 Mbps up.

WiFi: If the wired test is fast but WiFi is slow, the problem is wireless coverage or interference. Try changing WiFi channels in the portal, or have Optimum split your Smart WiFi bands so you can manually connect to 5 GHz.

When to Call Optimum Support (888-276-5255)

• Internet light is solid red for more than 15 minutes
• You need Bridge Mode enabled — this cannot be done without support
• Smart WiFi bands need to be split (2.4 GHz / 5 GHz)
• Wired speeds are consistently under 60% of your plan speed
• You want to check if Fiber is available at your address
• You are experiencing frequent disconnections or the Gateway keeps rebooting

Optimum Speed Test FAQs

How do I change my Optimum WiFi password? You cannot do it through 192.168.1.1 on newer equipment. Visit router.optimum.net and log in with your Optimum ID, or use the Optimum Support App on your phone.

Why is my upload speed so slow? If your upload is around 35 Mbps, you are on the cable (coax) network. Cable is inherently asymmetric. To get fast uploads, check if Optimum Fiber is available at your address.

Is Optimum Fiber better than Cable? Yes, dramatically. Fiber gives you symmetrical speeds (equal upload), lower latency (5-10 ms vs 20-40 ms), and no shared bandwidth with neighbours. If both are available, Fiber is the clear choice.

Can I use my own router? You can, but you need Bridge Mode to avoid double NAT issues. Call Optimum and ask them to enable it — you cannot do it yourself through the portal.

What is the Gateway 6 login address? Unlike traditional routers, the Gateway 6 does not use a local IP for management. Go to router.optimum.net instead.

Does Optimum have data caps? No. Optimum does not enforce data caps on any residential plan, whether Fiber or Cable.

Alternatives in Optimum Markets

Depending on your location (NY/NJ/CT/TX), these competitors may be available:

• Verizon Fios Speed Test – Major fibre competitor in the Northeast.
• Xfinity Speed Test – Comcast cable in overlapping areas.
• AT&T Fiber Speed Test – Available in Optimum's TX markets.
• Spectrum Speed Test – Cable alternative in parts of NY.
• T-Mobile Home Internet – 5G wireless option where available.