Visitor
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1 Message
Problems with Latency
I’m having intermittent latency spikes and packet loss while gaming on a wired Ethernet connection. My ping to the local Xfinity gateway at 10.0.0.1 stays consistently around 0–3 ms, but the first reachable Comcast hop and external destinations intermittently spike above 100–250 ms, with occasional packet loss/timeouts.
I checked the XB7 signal levels: downstream power is roughly +1 to +3.5 dBmV, downstream SNR is mostly 42–43 dB, upstream power is about 47–49 dBmV, and there are no uncorrectable codewords or recent T3/T4/ranging errors.
Can you check the connection from the gateway upstream, including node/CMTS congestion, upstream noise/ingress, and whether there are intermittent signal or latency issues in the area?
EG
Expert
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121.8K Messages
2 days ago
49dB of upstream power is on the high side/borderline in spec, but it may be intermittently fluctuating even higher to out of spec levels. That can cause random disconnects, spontaneous re-booting of the modem, speed, packet loss, latency problems, and the un-bonding of channels.
In an effort to try to obtain better connectivity / more wiggle room, check to see if there are any excess/unneeded coax cable splitters in the line leading to the modem that can be eliminated/reconfigured. Any splitters that remain should be high quality and cable rated for 5-1002 MHz, bi-directional, and no gold colored garbage from Home Depot, Target, Wal-Mart, etc. Splitters should be swapped with known to be good / new ones to test.
Also, check the coax cable for any damage such as cuts, nicks, abrasions, kinks, sharp bends, or animal chews.
If there aren't any unneeded splitters that can be eliminated and if your coax wiring setup can't be reconfigured so that there is a single two-way splitter connected directly off of the drop from the street / pole with one port feeding the modem and the other port feeding the rest of the house/equipment with additional splits as needed and you've checked all the wiring and fittings for integrity and tightness and refresh them by taking them apart then check for and clean off any corrosion / oxidation on the center wire and put them back together again, then perhaps it's best to book a tech visit to investigate and correct.
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XfinityJeffB
Official Employee
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759 Messages
7 hours ago
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