Visitor

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4 Messages

Tuesday, July 29th, 2025

Wifi Latency Absurdly High

Speeds are normal but latency ranges from 15 to 400 with tests. Online tests show huge spikes of 1500 ms. Resets and moving the router modem access point around hasn’t solved it.

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Expert

 • 

112.8K Messages

27 days ago

For a test, does a computer / device that is hardwired directly to the router / gateway device with an Ethernet cable have the same problem ?


With this test, we are trying to isolate this down to being either a WiFi-only problem or a problem with the general connection to the Comcast system which would of course affect both. It's a good first step in troubleshooting before proceeding any further. 

Visitor

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4 Messages

Yes I have, it’s equally bad on ethernet.

Expert

 • 

112.8K Messages

27 days ago

OK, what do the modem's signal status values look like ? Try getting them here; http://192.168.100.1 or here http://10.0.0.1 

Please copy all of the text in its entirety of the *Downstream Power Levels*, the *SNR's* (Signal to Noise Ratios), and the *Upstream Power Level* numbers and paste them into your next post.


What is the exact make and model number of the modem / gateway device ?

Visitor

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4 Messages

Downstream
Channel Bonding Value
Channel ID
193
Lock Status
Locked
Frequency
957000000
SNR
38.5 dB
Power Level
6.8 dBmV
Modulation
OFDM
Upstream
Channel Bonding Value
Channel ID
0
0
0
0
Lock Status
Frequency
Symbol Rate
Power Level
Modulation
Channel Type
Is this what you’re referring to? The gateway model is CGM4981COM snd product type XB8.

Expert

 • 

112.8K Messages

27 days ago

Are there any QAM 256 bonded downstream channels being shown? And the upstream channel table is not populated. We've seen posts here lately that there seems to be a firmware glitch with some XB8's where they don't show all of the channels and / or the error log entries.

Visitor

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4 Messages

Oh, yeah sorry I relogged and it appeared.

Downstream
Channel Bonding Value
Channel ID
4
1
2
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
193
Lock Status
Locked
Locked
Locked
Locked
Frequency
447 MHz
429 MHz
435 MHz
957000000
SNR
37.8 dB
41.7 dB
39.6 dB
37.6 dB
Power Level
6.7 dBmV
7.4 dBmV
6.8 dBmV
6.9 dBmV
Modulation
256 QAM
256 QAM
256 QAM
OFDM
*Channel ID 4 is the Primary channel
Upstream
Channel Bonding Value
Channel ID
1
2
0
0
0
Lock Status
Locked
Locked
Frequency
16 MHz
22 MHz
Symbol Rate
5120
5120
Power Level
36.5 dBmV
37.0 dBmV
Modulation
QAM
QAM
Channel Type
ATDMA
ATDMA
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