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Terrible latency to first hop, 96.120.68.201

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Terrible latency to first hop, 96.120.68.201

64 bytes from 96.120.68.201: icmp_seq=139 ttl=254 time=156 ms
64 bytes from 96.120.68.201: icmp_seq=140 ttl=254 time=66.6 ms
64 bytes from 96.120.68.201: icmp_seq=141 ttl=254 time=155 ms
64 bytes from 96.120.68.201: icmp_seq=142 ttl=254 time=135 ms
64 bytes from 96.120.68.201: icmp_seq=143 ttl=254 time=145 ms
64 bytes from 96.120.68.201: icmp_seq=144 ttl=254 time=214 ms
64 bytes from 96.120.68.201: icmp_seq=145 ttl=254 time=308 ms
64 bytes from 96.120.68.201: icmp_seq=146 ttl=254 time=188 ms
64 bytes from 96.120.68.201: icmp_seq=147 ttl=254 time=188 ms
64 bytes from 96.120.68.201: icmp_seq=148 ttl=254 time=240 ms
64 bytes from 96.120.68.201: icmp_seq=149 ttl=254 time=281 ms
64 bytes from 96.120.68.201: icmp_seq=150 ttl=254 time=293 ms
64 bytes from 96.120.68.201: icmp_seq=151 ttl=254 time=226 ms
64 bytes from 96.120.68.201: icmp_seq=152 ttl=254 time=89.1 ms
64 bytes from 96.120.68.201: icmp_seq=153 ttl=254 time=146 ms
64 bytes from 96.120.68.201: icmp_seq=154 ttl=254 time=138 ms
64 bytes from 96.120.68.201: icmp_seq=155 ttl=254 time=171 ms
64 bytes from 96.120.68.201: icmp_seq=156 ttl=254 time=232 ms
64 bytes from 96.120.68.201: icmp_seq=157 ttl=254 time=260 ms
64 bytes from 96.120.68.201: icmp_seq=158 ttl=254 time=182 ms
64 bytes from 96.120.68.201: icmp_seq=159 ttl=254 time=83.9 ms
64 bytes from 96.120.68.201: icmp_seq=160 ttl=254 time=194 ms
64 bytes from 96.120.68.201: icmp_seq=161 ttl=254 time=228 ms
64 bytes from 96.120.68.201: icmp_seq=162 ttl=254 time=219 ms
64 bytes from 96.120.68.201: icmp_seq=163 ttl=254 time=159 ms
64 bytes from 96.120.68.201: icmp_seq=164 ttl=254 time=216 ms
64 bytes from 96.120.68.201: icmp_seq=165 ttl=254 time=239 ms

 

Expert

Re: Terrible latency to first hop, 96.120.68.201

What do the modem's signal stats look like ? Try getting them here http://192.168.100.1 or here http://10.0.0.1

Please post the *Downstream Power Level*, the *Upstream Power Level*, and the *SNR* (Signal to Noise Ratio) numbers.

What is the exact make and model number of the modem ?

Is this a WiFi connection ?



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Frequent Visitor

Re: Terrible latency to first hop, 96.120.68.201

All tests done on a wired ethernet (not WiFi) connection.

Cable Modem is a Cisco XB3 DPC3941T.

 

Downstream
Channel Bonding Value
Index
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
Lock Status
Locked
Locked
Locked
Locked
Locked
Locked
Locked
Locked
Locked
Locked
Locked
Locked
Locked
Locked
Locked
Locked
Locked
Locked
Locked
Locked
Locked
Locked
Locked
Locked
Frequency
519 MHz
525 MHz
531 MHz
537 MHz
543 MHz
549 MHz
555 MHz
561 MHz
567 MHz
573 MHz
579 MHz
585 MHz
591 MHz
597 MHz
603 MHz
609 MHz
615 MHz
621 MHz
627 MHz
633 MHz
639 MHz
645 MHz
651 MHz
657 MHz
SNR
40.366 dB
40.366 dB
40.366 dB
40.366 dB
38.983 dB
38.983 dB
38.983 dB
38.983 dB
38.983 dB
38.983 dB
38.983 dB
38.983 dB
40.366 dB
38.605 dB
38.983 dB
38.983 dB
38.983 dB
38.983 dB
38.983 dB
38.605 dB
38.605 dB
38.605 dB
38.983 dB
38.605 dB
Power Level
6.600 dBmV
6.600 dBmV
6.600 dBmV
6.500 dBmV
6.300 dBmV
6.100 dBmV
6.200 dBmV
6.100 dBmV
6.000 dBmV
6.100 dBmV
6.200 dBmV
6.300 dBmV
6.400 dBmV
6.500 dBmV
6.400 dBmV
6.200 dBmV
5.900 dBmV
5.800 dBmV
5.700 dBmV
5.500 dBmV
5.600 dBmV
5.600 dBmV
5.500 dBmV
5.400 dBmV
Modulation
256 QAM
256 QAM
256 QAM
256 QAM
256 QAM
256 QAM
256 QAM
256 QAM
256 QAM
256 QAM
256 QAM
256 QAM
256 QAM
256 QAM
256 QAM
256 QAM
256 QAM
256 QAM
256 QAM
256 QAM
256 QAM
256 QAM
256 QAM
256 QAM
Upstream
Channel Bonding Value
Index
1
2
3
Lock Status
Locked
Locked
Locked
Frequency
30 MHz
23 MHz
36 MHz
Symbol Rate
5120 KSym/sec
5120 KSym/sec
5120 KSym/sec
Power Level
37.000 dBmV
37.000 dBmV
37.000 dBmV
Modulation
64 QAM
64 QAM
64 QAM
Channel Type    

 

Expert

Re: Terrible latency to first hop, 96.120.68.201

The stats as read at the modem level at that moment in time were o/k but there are three additional signal stats that can cause problems which can't be read by the modem. They can only be read from their end by them polling the CMTS (Cable Modem Termination System) at the local headend facility.

They are the "Upstream Rx Power" (Upstream Receive Power Level), the "Upstream SNR Ch." (Upstream Signal To Noise Ratio), and the "Upstream ICFR" (In Channel Frequency Response). These are as equally important in diagnosing connectivity issues as are the modem's stats.

You can call in and ask what these figures are. The Upstream Receive Power Level should fall within the range of -2dB to +2dB with 0dB being in the middle and perfect.

The Upstream SNR should be least 31dB, and the higher it is the better.

The ICFR should be no higher than 2 dB.

You could have an intermittent noise ingress issue in only the upstream channel(s) / return path only somewhere.

They will be able to see whether or not everything is in the green zone and also see a history plot for the modem.

 

Also be advised that that jitter could be being caused by an intermittent  capacity / traffic congestion problem on your local cable segment / node. Good luck !



I am not a Comcast Employee.
I am a fellow customer, volunteering my time to help other customers here in the Forums.
We ask that you post publicly so people with similar questions may benefit from the conversation.

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