Gigablast Operating at 1/3 of Advertised Speed

42 Down / 33 Up

For clarity if anyone views this in the future:

- Gigablast is advertised as 940 Mbps

- I am seeing 35-42 Mbps download speed.

- The upload speed is within the realm of what is advertised.

Download speed is about 4% of the advertised speed and not 33.33% as indicated by the initial post.

Sounds like your in DOSCIS 2.0 mode or something. Do you see all 32 channels listed when you look at your signal levels? See here for instructions.

Also, you said your "Device network adapter capability" is 867Mbps. Is that a wireless spec? Do you have a gigabit NIC?

I do see all 32 channels. Upstream QAM Power Levels (dBmV) for all frequencies are in the 40-42 range at a Symbolic rate of 5120 KSym/sec. Modulation is 64QAM for all and all have active lock status.

The site linked above indicates acceptable upstream power levels should 45 dBmV to 51 dBmv. Could this be the issue?

Hardware:

Computer 1

Network adapter for WAN is Intel(R) Wi-Fi 6 AX201 160MHz (2.4 Gbps). Network adapter for the ethernet cable is Intel I219-LM (1GbE).

Computer 2

Qualcomm Atheros QCA9377 which is rated for a peak speed of 433 Mbps.

Additional information:

1 - Modem is in bridge mode

2 - Hardwire to router yields 290Mbps

3 - Wifi yields 50-70 Mbps

4 - Hardwire to router yields 250 Mbps

5 - Hardwire to modem when not in bridge mode yields 250 Mbps

Thank you for all of the great comments and questions. 

The site linked above indicates acceptable upstream power levels should 45 dBmV to 51 dBmv. Could this be the issue?

Could be. I disagree with their thoughts on how high your upstream should be. IMO the lower the upstream the better. But I think the thought is if there is noise on the line a higher upstream will fair better. What is yours? IMO the sweet spot is around 42dB.

As for your speeds, 290Mbps is better but still less then the 940-960Mbps you should be seeing under optimal conditions. When connecting to Wi-Fi are you connecting to the 2.4Ghz network or the 5Ghz network? You can tell by the network name, which will have 2.4 or 5 at the end. If you only see one network, you probably have some kind of smart Wi-Fi feature that combines the networks. Disable it for best results or at least while troubleshooting. Connect to the 5Ghz while right next to the router for best results. Also, try using a Wi-Fi analyzer and look at the channels of the Wi-Fi networks around you. Pick a channel that is least used. For 2.4Ghz make sure to use channel 1,6,or 11.

As for your wired speed issue, I wonder if it could be the modem not using bridge mode correctly. Is there any reason you are using a gateway in bridge mode instead of a stand alone modem like the SB8200?