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Forum Discussion
Xfinity Speed slow with C7000 and R8500 Nighthawk
My setup is a C7000 modem connected to a R8500 router, with the router setup as an AP. I have Xfinity Blast! internet service at 150Mbps. When running Xfinity speed test on a wired connection or th...
You didn't specify whether you are getting these results connected through the R8500 or the C7000. You should isolate the bottleneck. Check your cables. A speed test of 90 Mbps could be an indication that one of your Ethernet connections is running at 100 Mbps instead of 1000 Mbps.
So I did the following:
- Disconnected the R8500 from the network.
- Run speed test with the wired connection to the C7000. 90 Mbps result.
- Factory reset the C7000. Speed test result of 175 Mbps result.
- Reconnected the R8500 to the network. Speed test result of 90 Mbps.
- Factory reset the R8500. Speed test result 175 Mbps.
Now the speed is good. Anyone know why the factory reset would need to be done? Anyways, thanks to all that read/replied.
Did you, perhaps, have QoS enabled? QoS is useful for prioritizing traffic on slower Internet connections. It's not very useful high speed connections such as yours.
Didn't have it enabled.
Now after having no speed issues the last few days, I ran the speed test and got a 90 Mbps result again. I didn't make any changes to the modem or router, and confirmed no issues/outages with Xfinity. I isolated the modem to find the bottleneck, but that returned a 90 Mpbs speed test result.
Could this be a hardware problem? Anyone have any ideas?
Did you check your cables?
What features have you enabled on the C7000? Traffic metering, site blocking, port forwarding, etc.?
Have you looked at the logs or the Cable Connection page on the C7000?
I think the cables are fine. I also swapped them out with different ones, and it didn't change anything.
Other than the wifi and login passwords, the C7000 and R8500 are set at factory defaults.
I think the information provided on the Cable Connection is ok, and i'm not sure what to make of the informtion provided in the logs. Copies of them are below.
The only "strange" item I found is that "Europe" is selected for the Region Selection found in the Wireless Setup. I can't chnage it to anything else because the pull-down selection box is locked-out.
Advanced -> Administration-> Log:
Description Count Last Occurrence Target Source [admin login] from source 192.168.0.14 1 Tue Jul 26 17:44:00 2016 0.0.0.0:0 192.168.0.14:0 [admin login failure] from source 192.168.0.14 1 Tue Jul 26 17:43:54 2016 0.0.0.0:0 192.168.0.14:0 [admin login] from source 192.168.0.14 1 Tue Jul 26 17:35:22 2016 0.0.0.0:0 192.168.0.14:0 [admin login failure] from source 192.168.0.14 1 Tue Jul 26 17:35:14 2016 0.0.0.0:0 192.168.0.14:0 Advanced -> Administration -> Event Log:
Time Priority Description 1970-1-1, 00:00:38 Critical (3) SYNC Timing Synchronization failure - Failed to acquire QAM/QPSK symbol timing;;CM-MAC=b0:7f:b9:5c:c3:58;CMTS-MAC=00:00:00:00:00:00;CM-QOS=1.0;CM-VER=3.0; 1970-1-1, 00:00:42 Critical (3) SYNC Timing Synchronization failure - Failed to acquire QAM/QPSK symbol timing;;CM-MAC=b0:7f:b9:5c:c3:58;CMTS-MAC=00:00:00:00:00:00;CM-QOS=1.0;CM-VER=3.0; 1970-1-1, 00:00:42 Critical (3) SYNC Timing Synchronization failure - Failed to acquire FEC framing;CM-MAC=b0:7f:b9:5c:c3:58;CMTS-MAC=00:00:00:00:00:00;CM-QOS=1.0;CM-VER=3.0; 1970-1-1, 00:00:42 Critical (3) SYNC Timing Synchronization failure - Failed to acquire QAM/QPSK symbol timing;;CM-MAC=b0:7f:b9:5c:c3:58;CMTS-MAC=00:00:00:00:00:00;CM-QOS=1.0;CM-VER=3.0; 1970-1-1, 00:00:49 Critical (3) No Ranging Response received - T3 time-out;CM-MAC=b0:7f:b9:5c:c3:58;CMTS-MAC=00:01:5c:86:9a:6c;CM-QOS=1.0;CM-VER=3.0; 2016-7-24, 06:37:48 Critical (3) No Ranging Response received - T3 time-out;CM-MAC=b0:7f:b9:5c:c3:58;CMTS-MAC=00:01:5c:86:9a:6c;CM-QOS=1.0;CM-VER=3.0; 1970-1-1, 00:00:37 Critical (3) SYNC Timing Synchronization failure - Failed to acquire FEC framing;CM-MAC=b0:7f:b9:5c:c3:58;CMTS-MAC=00:00:00:00:00:00;CM-QOS=1.0;CM-VER=3.0; 1970-1-1, 00:00:42 Critical (3) No Ranging Response received - T3 time-out;CM-MAC=b0:7f:b9:5c:c3:58;CMTS-MAC=00:01:5c:86:9a:6c;CM-QOS=1.0;CM-VER=3.0; 1970-1-1, 00:00:38 Critical (3) SYNC Timing Synchronization failure - Failed to acquire FEC framing;CM-MAC=b0:7f:b9:5c:c3:58;CMTS-MAC=00:00:00:00:00:00;CM-QOS=1.0;CM-VER=3.0; 1970-1-1, 00:00:41 Notice (6) WiFi Interface [wl0] set to Channel 1 (Side-Band Channel:N/A) - Reason:INIT 1970-1-1, 00:00:41 Notice (6) WiFi Interface [wl1] set to Channel 153 (Side-Band Channel:N/A) - Reason:INIT 1970-1-1, 00:00:45 Critical (3) No Ranging Response received - T3 time-out;CM-MAC=b0:7f:b9:5c:c3:58;CMTS-MAC=00:01:5c:86:9a:6c;CM-QOS=1.0;CM-VER=3.0; 1970-1-1, 00:00:53 Notice (6) Honoring MDD; IP provisioning mode = IPv6 2016-7-26, 10:39:05 Warning (5) TEK Invalid - Invalid Key Sequence Number;CM-MAC=b0:7f:b9:5c:c3:58;CMTS-MAC=00:01:5c:86:9a:6c;CM-QOS=1.1;CM-VER=3.0; Cable Connection:
Frequency start Value
This field below allows you to modify the frequency the cable modem start with its scan during initialization and registration. Enter the new start frequency and restart the cable modem for it to take effect.
Starting Frequency
0 Startup Procedure
Procedure
Status
Comment
Acquire Downstream Channel
741000000 Hz
Locked
Connectivity State
OK
Operational
Boot State
OK
Operational
Security
Enabled
BPI+
IP Provisioning Mode
Honor MDD
honorMdd(4)
Downstream Bonded Channels
Channel
Lock Status
Modulation
Channel ID
Frequency
Power
SNR
Correctables
Uncorrectables
1
Locked
QAM256
19
741000000 Hz
-3.1 dBmV
37.8 dB
7
0
2
Locked
QAM256
1
633000000 Hz
-5.6 dBmV
36.9 dB
11
0
3
Locked
QAM256
2
639000000 Hz
-6 dBmV
36.6 dB
16
0
4
Locked
QAM256
3
645000000 Hz
-6.2 dBmV
36.6 dB
27
0
5
Locked
QAM256
4
651000000 Hz
-6.5 dBmV
36.4 dB
15
0
6
Locked
QAM256
5
657000000 Hz
-6.3 dBmV
36.5 dB
14
0
7
Locked
QAM256
6
663000000 Hz
-6 dBmV
36.7 dB
15
0
8
Locked
QAM256
7
669000000 Hz
-5.7 dBmV
36.9 dB
8
0
9
Locked
QAM256
8
675000000 Hz
-5.5 dBmV
36.4 dB
10
0
10
Locked
QAM256
9
681000000 Hz
-5.2 dBmV
37.1 dB
9
0
11
Locked
QAM256
10
687000000 Hz
-5 dBmV
37.2 dB
9
0
12
Locked
QAM256
11
693000000 Hz
-4.9 dBmV
37.3 dB
13
0
13
Locked
QAM256
12
699000000 Hz
-4.9 dBmV
37.2 dB
12
0
14
Locked
QAM256
13
705000000 Hz
-4.6 dBmV
37.4 dB
15
0
15
Locked
QAM256
14
711000000 Hz
-4.4 dBmV
37.5 dB
11
0
16
Locked
QAM256
15
717000000 Hz
-4.2 dBmV
37.5 dB
14
0
17
Locked
QAM256
16
723000000 Hz
-4.1 dBmV
38.6 dB
0
0
18
Locked
QAM256
17
729000000 Hz
-3.7 dBmV
39 dB
0
0
19
Locked
QAM256
18
735000000 Hz
-3.5 dBmV
38.9 dB
0
0
20
Locked
QAM256
20
747000000 Hz
-3.9 dBmV
38.6 dB
0
0
21
Not Locked
Unknown
0
0 Hz
0.0 dBmV
0.0 dB
0
0
22
Not Locked
Unknown
0
0 Hz
0.0 dBmV
0.0 dB
0
0
23
Not Locked
Unknown
0
0 Hz
0.0 dBmV
0.0 dB
0
0
24
Not Locked
Unknown
0
0 Hz
0.0 dBmV
0.0 dB
0
0
Upstream Bonded Channels
Channel
Lock Status
US Channel Type
Channel ID
Symbol Rate
Frequency
Power
1
Locked
ATDMA
17
5120 Ksym/sec
36400000 Hz
45.5 dBmV
2
Locked
ATDMA
18
5120 Ksym/sec
29500000 Hz
44.8 dBmV
3
Locked
ATDMA
19
5120 Ksym/sec
22600000 Hz
43.5 dBmV
4
Locked
ATDMA
20
5120 Ksym/sec
15700000 Hz
42.3 dBmV
5
Not Locked
Unknown
0
0 Ksym/sec
0 Hz
0.0 dBmV
6
Not Locked
Unknown
0
0 Ksym/sec
0 Hz
0.0 dBmV
7
Not Locked
Unknown
0
0 Ksym/sec
0 Hz
0.0 dBmV
8
Not Locked
Unknown
0
0 Ksym/sec
0 Hz
0.0 dBmV
Current System Time:Tue Jul 26 17:36:05 2016