Optimum Speed Test
This diagnostic utility validates the throughput of your Optimum connection. It is critical to identify the physical infrastructure powering your home: Optimum Fiber (100% Fiber-to-the-Home), or the legacy Optimum Online (Hybrid Fiber-Coaxial) network. Your speed test results will exhibit fundamentally different characteristics depending on which technology is installed.
While Optimum Fiber is known for stability, legacy Coax users frequently report "slow speeds" that are actually caused by RF Impairment (noise on the copper line) or old splitters degrading the signal, rather than a total outage.
Understanding Your Speed Metrics
When analyzing your connection integrity, focus on these three performance vectors:
Download Throughput: On Optimum Fiber plans (300, 500, 1 Gig, 2 Gig, 5 Gig), speeds should be consistent and match the advertised rate. On Coax plans, speeds are susceptible to "node congestion," meaning you may see a dip in performance between 7 PM and 11 PM when neighborhood usage is highest.
Upload Throughput: This is the easiest way to identify your technology. Optimum Fiber offers Symmetrical Speeds (Upload = Download). Legacy Coax plans are Asymmetrical, often providing upload speeds that are only 5-10% of the download speed (e.g., 35 Mbps upload on a 1 Gig download plan).
Latency (Ping): Fiber connections typically deliver <10ms ping to local servers (NY/NJ/CT area). Coax connections often range from 20-40ms. If Coax ping spikes >100ms, it often indicates "Ingress Noise" from a loose cable connector.
What Results Should You Expect?
The "Altice One" Factor
Many users rely on the all-in-one Altice One gateway. Benchmarks for this device include:
Download Speed: ~940 Mbps (on 1 Gig plan via Ethernet)
Wi-Fi Speed: ~400-600 Mbps (on standard 5GHz devices)
Upload Speed: Symmetrical on Fiber, ~35-50 Mbps on Coax.
If you pay for 1 Gig Coax but your wired speed test is stuck at exactly 30 Mbps upload, this is a physical limitation of the DOCSIS network, not a router setting you can change.
Why Is Your Optimum Connection Slow?
Before contacting support, verify these common premise-level faults:
US/DS Blinking: On Ubee or Arris modems, if the "US" (Upstream) or "DS" (Downstream) lights are blinking instead of solid, the modem is struggling to lock onto the signal frequencies. This requires a technician.
Tighten Connections: For Coax users, a loose coaxial cable at the wall plate is the #1 cause of intermittent drops. Ensure it is "wrench tight" (slightly more than finger tight).
Gateway Reboot: The Altice One box is essentially a computer. If it becomes sluggish, hold the "Diamond" button on the front for 10 seconds to force a deep reboot.
Optimum Technical Configuration Data
| Parameter | Configuration Details |
| Gateway Hardware | Altice One / Ubee 1326 / Gateway 6 (Fiber) |
| Gateway IP | 192.168.1.1 or router.optimum.net |
| Admin Username | admin (Password often password or on sticker) |
| Status Lights | Online (Solid Green = Good) / US/DS (Must be Solid) |
| Support Number | 888-276-5255 |
How to Get an Accurate Test
Wireless testing is unreliable for verifying Gigabit speeds due to interference from neighbors in dense service areas (NY/NJ).
To confirm the actual speed delivered to your home, connect a Cat6 Ethernet cable directly from the Optimum Gateway (LAN Port 1) to a laptop. This isolates the ISP connection. If this wired test shows full speed, your line is healthy.
When to Call Support
Escalate the issue to Optimum if you observe these specific failures:
Blinking US/DS: The modem cannot bond channels due to low signal.
"NET" Light Off: On the Altice One, if the "NET" or "@" symbol is not lit, there is no internet signal.
Fiber LOS: On Fiber gateways, a Red "LOS" light means the fiber cable is cut.
You can check for outages and reset your modem signal via the Optimum Support App or by calling 888-276-5255.