C7800 Keeps Disconnecting and/or Very Slow

Question

Our C7800 Nighthawk cable modem router recently started disconnecting or getting VERY slow speeds out of the blue. We purchased it in April 2021 and it worked flawlessly up until the middle of last month. This happens while diriectly connect to the Nighthawk AND on WiFi from several different devices. I've done a factory reset, contacted the ISP (Wow! Internet) multiple times, rebooted, etc and have had no luck. Very frustrating.

The Cable Connection info changes often. One time I only had one unlocked channel, I'll refresh the cable connections page and all of a sudden ALL of the downstream channels are not locked. The ISP keeps telling me it's a hardware issue and to contact Netgear.

There's one splitter in the Coax cable and I don't have a power source where it comes into the house to directly attach the Nighthawk to it.

Do any of you have suggestions?

Cable Connection

Apply Cancel

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

<tabindex=-1>Startup Procedure</tabindex=-1>

Procedure	Status	Comment
Acquire Downstream Channel	747000000 Hz	Locked
Connectivity State	OK	Operational
Boot State	OK	Operational
Security	ENABLED	BPI+
IP Provisioning Mode	Honor MDD	IPv4 only

<tabindex=-1>Downstream Bonded Channels (Partial Service)</tabindex=-1>

Channel	Lock Status	Modulation	Channel ID	Frequency	Power	SNR	Correctables	Uncorrectabables
1	Locked	QAM256	31	747000000 Hz	-3.0 dBmV	38.9 dB	0	0
2	Locked	QAM256	1	561000000 Hz	0.6 dBmV	31.1 dB	11668599	687709
3	Locked	QAM256	2	567000000 Hz	0.8 dBmV	42.5 dB	0	0
4	Locked	QAM256	3	573000000 Hz	1.0 dBmV	42.7 dB	0	0
5	Locked	QAM256	4	579000000 Hz	0.7 dBmV	42.4 dB	0	0
6	Locked	QAM256	5	585000000 Hz	0.8 dBmV	42.5 dB	0	0
7	Locked	QAM256	6	591000000 Hz	0.8 dBmV	42.5 dB	0	0
8	Locked	QAM256	7	597000000 Hz	1.2 dBmV	42.5 dB	0	0
9	Locked	QAM256	8	603000000 Hz	1.3 dBmV	42.5 dB	0	0
10	Locked	QAM256	9	609000000 Hz	1.5 dBmV	42.6 dB	0	0
11	Locked	QAM256	10	615000000 Hz	1.5 dBmV	41.3 dB	345	0
12	Locked	QAM256	11	621000000 Hz	1.5 dBmV	34.6 dB	316728	281489
13	Locked	QAM256	12	627000000 Hz	0.9 dBmV	31.4 dB	120293	40300
14	Locked	QAM256	13	633000000 Hz	0.4 dBmV	41.6 dB	2345904	1268636
15	Locked	QAM256	14	639000000 Hz	0.4 dBmV	41.9 dB	4594	0
16	Locked	QAM256	15	645000000 Hz	0.5 dBmV	41.9 dB	0	0
17	Locked	QAM256	16	651000000 Hz	0.7 dBmV	41.8 dB	0	0
18	Locked	QAM256	17	657000000 Hz	0.8 dBmV	41.9 dB	0	0
19	Locked	QAM256	18	663000000 Hz	0.8 dBmV	41.7 dB	0	0
20	Locked	QAM256	19	669000000 Hz	0.6 dBmV	41.6 dB	0	0
21	Locked	QAM256	20	681000000 Hz	0.3 dBmV	41.6 dB	0	0
22	Locked	QAM256	21	687000000 Hz	0.1 dBmV	41.5 dB	0	0
23	Locked	QAM256	22	693000000 Hz	0.0 dBmV	41.6 dB	0	0
24	Locked	QAM256	23	699000000 Hz	0.0 dBmV	41.6 dB	0	0
25	Locked	QAM256	24	705000000 Hz	-0.3 dBmV	41.3 dB	0	0
26	Locked	QAM256	25	711000000 Hz	-0.8 dBmV	41.2 dB	0	0
27	Locked	QAM256	26	717000000 Hz	-1.1 dBmV	41.1 dB	0	0
28	Locked	QAM256	27	723000000 Hz	-1.5 dBmV	40.8 dB	0	0
29	Locked	QAM256	28	729000000 Hz	-1.7 dBmV	40.0 dB	0	0
30	Locked	QAM256	29	735000000 Hz	-1.8 dBmV	39.4 dB	0	0
31	Locked	QAM256	30	741000000 Hz	-2.3 dBmV	38.2 dB	0	0
32	Not Locked	Unknown	0	0 Hz	0.0 dBmV	0.0 dB	0	0

<tabindex=-1>Upstream Bonded Channels</tabindex=-1>

Channel	Lock Status	US Channel Type	Channel ID	Symbol Rate	Frequency	Power
1	Locked	ATDMA	6	5120 Ksym/sec	24600000 Hz	47.5 dBmV
2	Locked	ATDMA	5	2560 Ksym/sec	18000000 Hz	46.3 dBmV
3	Locked	ATDMA	7	5120 Ksym/sec	31000000 Hz	48.8 dBmV
4	Locked	ATDMA	8	5120 Ksym/sec	37400000 Hz	49.8 dBmV
5	Not Locked	Unknown	0	0 Ksym/sec	0 Hz	0 dBmV
6	Not Locked	Unknown	0	0 Ksym/sec	0 Hz	0 dBmV
7	Not Locked	Unknown	0	0 Ksym/sec	0 Hz	0 dBmV
8	Not Locked	Unknown	0	0 Ksym/sec	0 Hz	0 dBmV

<tabindex=-1>Downstream OFDM Channels</tabindex=-1>

Channel	Channel ID	Indicator	Subcarrier Zero Frequency	Active Subcarrier Number Range	Total Codewords	Uncorrectable Codewords
1	32	Non-Primary	428600000 Hz	1528 ~ 2567	794019	131402
2	0	Other	0 Hz	0 ~ 0	0	0

<tabindex=-1>Upstream OFDMA Channels</tabindex=-1>

Channel	UpstreamIsMuted	Ranging Status	Subcarrier Zero Frequency	Active Subcarrier Number Range	Symbols Per Frame	Tx Power
1		Other	0 Hz	0 ~ 0	0	0 dBmV
2		Other	0 Hz	0 ~ 0	0	0 dBmV

Current System Time: Mon, Mar 07, 2022 15:47:40

EVENT LOG

Time	Priority	Description
2022-03-07, 11:29:46	Warning (5)	MDD message timeout;CM-MAC=9c:c9:eb:87:d9:b0;CMTS-MAC=00:01:5c:b7:10:91;CM-QOS=1.1;CM-VER=3.1;
2022-03-07, 11:24:03	Critical (3)	Started Unicast Maintenance Ranging - No Response received - T3 time-out;CM-MAC=9c:c9:eb:87:d9:b0;CMTS-MAC=00:01:5c:b7:10:91;CM-QOS=1.1;CM-VER=3.1;
2022-03-07, 11:23:59	Notice (6)	TLV-11 - unrecognized OID;CM-MAC=9c:c9:eb:87:d9:b0;CMTS-MAC=00:01:5c:b7:10:91;CM-QOS=1.1;CM-VER=3.1;
Time Not Established	Warning (5)	DHCP WARNING - Non-critical field invalid in response ;CM-MAC=9c:c9:eb:87:d9:b0;CMTS-MAC=00:01:5c:b7:10:91;CM-QOS=1.1;CM-VER=3.1;
Time Not Established	Notice (6)	Honoring MDD; IP provisioning mode = IPv4
Time Not Established	Critical (3)	No Ranging Response received - T3 time-out;CM-MAC=9c:c9:eb:87:d9:b0;CMTS-MAC=00:01:5c:b7:10:91;CM-QOS=1.1;CM-VER=3.1;
Time Not Established	Critical (3)	SYNC Timing Synchronization failure - Failed to acquire QAM/QPSK symbol timing;CM-MAC=9c:c9:eb:87:d9:b0;CMTS-MAC=00:00:00:00:00:00;CM-QOS=1.1;CM-VER=3.1;
2022-03-07, 11:20:49	Critical (3)	Started Unicast Maintenance Ranging - No Response received - T3 time-out;CM-MAC=9c:c9:eb:87:d9:b0;CMTS-MAC=00:01:5c:b7:10:91;CM-QOS=1.1;CM-VER=3.1;
Time Not Established	Critical (3)	SYNC Timing Synchronization failure - Failed to acquire QAM/QPSK symbol timing;CM-MAC=9c:c9:eb:87:d9:b0;CMTS-MAC=00:00:00:00:00:00;CM-QOS=1.1;CM-VER=3.1;
2022-03-06, 18:15:58	Critical (3)	Started Unicast Maintenance Ranging - No Response received - T3 time-out;CM-MAC=9c:c9:eb:87:d9:b0;CMTS-MAC=00:01:5c:b7:10:91;CM-QOS=1.1;CM-VER=3.1;
Time Not Established	Critical (3)	No Ranging Response received - T3 time-out;CM-MAC=9c:c9:eb:87:d9:b0;CMTS-MAC=00:01:5c:b7:10:91;CM-QOS=1.1;CM-VER=3.1;
Time Not Established	Critical (3)	SYNC Timing Synchronization failure - Failed to acquire QAM/QPSK symbol timing;CM-MAC=9c:c9:eb:87:d9:b0;CMTS-MAC=00:00:00:00:00:00;CM-QOS=1.1;CM-VER=3.1;
2022-03-06, 17:47:07	Critical (3)	Started Unicast Maintenance Ranging - No Response received - T3 time-out;CM-MAC=9c:c9:eb:87:d9:b0;CMTS-MAC=00:01:5c:b7:10:91;CM-QOS=1.1;CM-VER=3.1;
Time Not Established	Critical (3)	No Ranging Response received - T3 time-out;CM-MAC=9c:c9:eb:87:d9:b0;CMTS-MAC=00:01:5c:b7:10:91;CM-QOS=1.1;CM-VER=3.1;
Time Not Established	Critical (3)	SYNC Timing Synchronization failure - Failed to acquire QAM/QPSK symbol timing;CM-MAC=9c:c9:eb:87:d9:b0;CMTS-MAC=00:00:00:00:00:00;CM-QOS=1.1;CM-VER=3.1;
Time Not Established	Critical (3)	DHCP FAILED - Discover sent, no offer received;CM-MAC=9c:c9:eb:87:d9:b0;CMTS-MAC=00:01:5c:b7:10:91;CM-QOS=1.1;CM-VER=3.1;
Time Not Established	Critical (3)	No Ranging Response received - T3 time-out;CM-MAC=9c:c9:eb:87:d9:b0;CMTS-MAC=00:01:5c:b7:10:91;CM-QOS=1.1;CM-VER=3.1;
Time Not Established	Critical (3)	SYNC Timing Synchronization failure - Failed to acquire QAM/QPSK symbol timing;CM-MAC=9c:c9:eb:87:d9:b0;CMTS-MAC=00:00:00:00:00:00;CM-QOS=1.1;CM-VER=3.1;
2022-03-05, 09:29:27	Critical (3)	Started Unicast Maintenance Ranging - No Response received - T3 time-out;CM-MAC=9c:c9:eb:87:d9:b0;CMTS-MAC=00:01:5c:b7:10:91;CM-QOS=1.1;CM-VER=3.1;
Time Not Established	Critical (3)	No Ranging Response received - T3 time-out;CM-MAC=9c:c9:eb:87:d9:b0;CMTS-MAC=00:01:5c:b7:10:91;CM-QOS=1.1;CM-VER=3.1;
Time Not Established	Critical (3)	SYNC Timing Synchronization failure - Failed to acquire QAM/QPSK symbol timing;CM-MAC=9c:c9:eb:87:d9:b0;CMTS-MAC=00:00:00:00:00:00;CM-QOS=1.1;CM-VER=3.1;
Time Not Established	Critical (3)	No Ranging Response received - T3 time-out;CM-MAC=9c:c9:eb:87:d9:b0;CMTS-MAC=00:01:5c:b7:10:91;CM-QOS=1.1;CM-VER=3.1;
Time Not Established	Critical (3)	SYNC Timing Synchronization failure - Failed to acquire QAM/QPSK symbol timing;CM-MAC=9c:c9:eb:87:d9:b0;CMTS-MAC=00:00:00:00:00:00;CM-QOS=1.1;CM-VER=3.1;
Time Not Established	Critical (3)	SYNC Timing Synchronization failure - Failed to acquire QAM/QPSK symbol timing;CM-MAC=9c:c9:eb:87:d9:b0;CMTS-MAC=00:00:00:00:00:00;CM-QOS=1.1;CM-VER=3.1;

NightHawkNancy · Answer

Thanks for the reply plemans&nbsp;! I removed the splitter from the coax line and connected the Nighthawk directly to where coax comes into the house. Cable appears to be in good condition. WiFi dropped out multiple times since moving it.&nbsp;&nbsp;Below is the latest Cable Connection report and Event Logs. Does this appear to be a hardware issue or ISP issue?&nbsp;&nbsp;Cable ConnectionFrequency start Value&nbsp;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.&nbsp;Starting Frequency&nbsp;&nbsp;&lt;tabindex=-1&gt;Startup Procedure&lt;/tabindex=-1&gt;ProcedureStatusCommentAcquire Downstream Channel747000000 HzLockedConnectivity StateOKOperationalBoot StateOKOperationalSecurityENABLEDBPI+IP Provisioning ModeHonor MDDIPv4 only&nbsp;&nbsp;&lt;tabindex=-1&gt;Downstream Bonded Channels&lt;/tabindex=-1&gt;&nbsp;ChannelLock StatusModulationChannel IDFrequencyPowerSNRCorrectablesUncorrectabables1LockedQAM25631747000000 Hz7.3 dBmV40.1 dB2781162LockedQAM2561561000000 Hz9.5 dBmV42.3 dB003LockedQAM2562567000000 Hz9.9 dBmV42.8 dB004LockedQAM2563573000000 Hz10.5 dBmV42.9 dB005LockedQAM2564579000000 Hz10.7 dBmV43.0 dB006LockedQAM2565585000000 Hz11.1 dBmV42.9 dB007LockedQAM2566591000000 Hz11.4 dBmV43.1 dB008LockedQAM2567597000000 Hz11.7 dBmV43.2 dB009LockedQAM2568603000000 Hz11.4 dBmV42.8 dB0010LockedQAM2569609000000 Hz10.8 dBmV42.5 dB0011LockedQAM25610615000000 Hz10.4 dBmV42.6 dB0012LockedQAM25611621000000 Hz10.3 dBmV42.1 dB0013LockedQAM25612627000000 Hz10.2 dBmV42.3 dB0014LockedQAM25613633000000 Hz10.0 dBmV42.3 dB0015LockedQAM25614639000000 Hz10.3 dBmV42.3 dB0016LockedQAM25615645000000 Hz10.6 dBmV42.1 dB0017LockedQAM25616651000000 Hz10.9 dBmV42.3 dB0018LockedQAM25617657000000 Hz11.3 dBmV42.4 dB0019LockedQAM25618663000000 Hz11.5 dBmV42.4 dB0020LockedQAM25619669000000 Hz11.2 dBmV42.3 dB0021LockedQAM25620681000000 Hz10.5 dBmV42.1 dB0022LockedQAM25621687000000 Hz10.1 dBmV41.9 dB0023LockedQAM25622693000000 Hz9.7 dBmV41.9 dB12024LockedQAM25623699000000 Hz9.6 dBmV42.0 dB11025LockedQAM25624705000000 Hz9.4 dBmV41.7 dB9026LockedQAM25625711000000 Hz9.4 dBmV41.9 dB54027LockedQAM25626717000000 Hz9.4 dBmV41.8 dB50028LockedQAM25627723000000 Hz9.6 dBmV41.8 dB653029LockedQAM25628729000000 Hz9.5 dBmV41.8 dB1124630LockedQAM25629735000000 Hz9.1 dBmV41.5 dB1089631LockedQAM25630741000000 Hz8.3 dBmV41.1 dB1497532Not LockedUnknown00 Hz0.0 dBmV0.0 dB00&nbsp;&nbsp;&lt;tabindex=-1&gt;Upstream Bonded Channels&lt;/tabindex=-1&gt;&nbsp;ChannelLock StatusUS Channel TypeChannel IDSymbol RateFrequencyPower1LockedATDMA52560 Ksym/sec18000000 Hz39.5 dBmV2LockedATDMA75120 Ksym/sec31000000 Hz41.8 dBmV3LockedATDMA65120 Ksym/sec24600000 Hz40.8 dBmV4LockedATDMA85120 Ksym/sec37400000 Hz43.0 dBmV5Not LockedUnknown00 Ksym/sec0 Hz0 dBmV6Not LockedUnknown00 Ksym/sec0 Hz0 dBmV7Not LockedUnknown00 Ksym/sec0 Hz0 dBmV8Not LockedUnknown00 Ksym/sec0 Hz0 dBmV&nbsp;&nbsp;&lt;tabindex=-1&gt;Downstream OFDM Channels&lt;/tabindex=-1&gt;&nbsp;ChannelChannel IDIndicatorSubcarrier Zero FrequencyActive Subcarrier Number RangeTotal CodewordsUncorrectable Codewords132Non-Primary428600000 Hz1528 ~ 256719243752520Other0 Hz0 ~ 000&nbsp;&nbsp;&lt;tabindex=-1&gt;Upstream OFDMA Channels&lt;/tabindex=-1&gt;&nbsp;ChannelUpstreamIsMutedRanging StatusSubcarrier Zero FrequencyActive Subcarrier Number RangeSymbols Per FrameTx Power1&nbsp;Other0 Hz0 ~ 000 dBmV2&nbsp;Other0 Hz0 ~ 000 dBmV&nbsp;&nbsp;Current System Time:&nbsp;Tue, Mar 08, 2022 16:40:42&nbsp;&nbsp;&nbsp;EVENT LOG&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;TimePriorityDescription2022-03-08, 12:26:25Critical (3)Started Unicast Maintenance Ranging - No Response received - T3 time-out;CM-MAC=9c:c9:eb:87:d9:b0;CMTS-MAC=00:01:5c:b7:10:91;CM-QOS=1.1;CM-VER=3.1;2022-03-08, 12:26:21Notice (6)TLV-11 - unrecognized OID;CM-MAC=9c:c9:eb:87:d9:b0;CMTS-MAC=00:01:5c:b7:10:91;CM-QOS=1.1;CM-VER=3.1;Time Not EstablishedWarning (5)DHCP WARNING - Non-critical field invalid in response ;CM-MAC=9c:c9:eb:87:d9:b0;CMTS-MAC=00:01:5c:b7:10:91;CM-QOS=1.1;CM-VER=3.1;Time Not EstablishedCritical (3)DHCP FAILED - Discover sent, no offer received;CM-MAC=9c:c9:eb:87:d9:b0;CMTS-MAC=00:01:5c:b7:10:91;CM-QOS=1.1;CM-VER=3.1;Time Not EstablishedNotice (6)Honoring MDD; IP provisioning mode = IPv4Time Not EstablishedCritical (3)No Ranging Response received - T3 time-out;CM-MAC=9c:c9:eb:87:d9:b0;CMTS-MAC=00:01:5c:b7:10:91;CM-QOS=1.1;CM-VER=3.1;Time Not EstablishedCritical (3)SYNC Timing Synchronization failure - Failed to acquire QAM/QPSK symbol timing;CM-MAC=9c:c9:eb:87:d9:b0;CMTS-MAC=00:00:00:00:00:00;CM-QOS=1.1;CM-VER=3.1;2022-03-08, 11:52:22Critical (3)Started Unicast Maintenance Ranging - No Response received - T3 time-out;CM-MAC=9c:c9:eb:87:d9:b0;CMTS-MAC=00:01:5c:b7:10:91;CM-QOS=1.1;CM-VER=3.1;Time Not EstablishedCritical (3)DHCP FAILED - Discover sent, no offer received;CM-MAC=9c:c9:eb:87:d9:b0;CMTS-MAC=00:01:5c:b7:10:91;CM-QOS=1.1;CM-VER=3.1;Time Not EstablishedCritical (3)No Ranging Response received - T3 time-out;CM-MAC=9c:c9:eb:87:d9:b0;CMTS-MAC=00:01:5c:b7:10:91;CM-QOS=1.1;CM-VER=3.1;Time Not EstablishedCritical (3)DHCP FAILED - Discover sent, no offer received;CM-MAC=9c:c9:eb:87:d9:b0;CMTS-MAC=00:01:5c:b7:10:91;CM-QOS=1.1;CM-VER=3.1;Time Not EstablishedCritical (3)No Ranging Response received - T3 time-out;CM-MAC=9c:c9:eb:87:d9:b0;CMTS-MAC=00:01:5c:b7:10:91;CM-QOS=1.1;CM-VER=3.1;Time Not EstablishedCritical (3)SYNC Timing Synchronization failure - Failed to acquire QAM/QPSK symbol timing;CM-MAC=9c:c9:eb:87:d9:b0;CMTS-MAC=00:00:00:00:00:00;CM-QOS=1.1;CM-VER=3.1;2022-03-07, 16:22:34Critical (3)Started Unicast Maintenance Ranging - No Response received - T3 time-out;CM-MAC=9c:c9:eb:87:d9:b0;CMTS-MAC=00:01:5c:b7:10:91;CM-QOS=1.1;CM-VER=3.1;Time Not EstablishedCritical (3)SYNC Timing Synchronization failure - Failed to acquire QAM/QPSK symbol timing;CM-MAC=9c:c9:eb:87:d9:b0;CMTS-MAC=00:00:00:00:00:00;CM-QOS=1.1;CM-VER=3.1;2022-03-07, 16:17:43Critical (3)16 consecutive T3 timeouts while trying to range on upstream channel 3;CM-MAC=9c:c9:eb:87:d9:b0;CMTS-MAC=00:01:5c:b7:10:91;CM-QOS=1.1;CM-VER=3.1;2022-03-07, 16:17:43Critical (3)Unicast Maintenance Ranging attempted - No response - Retries exhausted;CM-MAC=9c:c9:eb:87:d9:b0;CMTS-MAC=00:01:5c:b7:10:91;CM-QOS=1.1;CM-VER=3.1;2022-03-07, 16:17:33Critical (3)Started Unicast Maintenance Ranging - No Response received - T3 time-out;CM-MAC=9c:c9:eb:87:d9:b0;CMTS-MAC=00:01:5c:b7:10:91;CM-QOS=1.1;CM-VER=3.1;2022-03-07, 16:17:28Critical (3)16 consecutive T3 timeouts while trying to range on upstream channel 0;CM-MAC=9c:c9:eb:87:d9:b0;CMTS-MAC=00:01:5c:b7:10:91;CM-QOS=1.1;CM-VER=3.1;2022-03-07, 16:17:28Critical (3)Unicast Maintenance Ranging attempted - No response - Retries exhausted;CM-MAC=9c:c9:eb:87:d9:b0;CMTS-MAC=00:01:5c:b7:10:91;CM-QOS=1.1;CM-VER=3.1;2022-03-07, 14:05:56Critical (3)Started Unicast Maintenance Ranging - No Response received - T3 time-out;CM-MAC=9c:c9:eb:87:d9:b0;CMTS-MAC=00:01:5c:b7:10:91;CM-QOS=1.1;CM-VER=3.1;Time Not EstablishedCritical (3)SYNC Timing Synchronization failure - Failed to acquire QAM/QPSK symbol timing;CM-MAC=9c:c9:eb:87:d9:b0;CMTS-MAC=00:00:00:00:00:00;CM-QOS=1.1;CM-VER=3.1;2022-03-07, 13:52:38Critical (3)SYNC Timing Synchronization failure - Failed to acquire QAM/QPSK symbol timing;CM-MAC=9c:c9:eb:87:d9:b0;CMTS-MAC=00:01:5c:b7:10:91;CM-QOS=1.1;CM-VER=3.1;2022-03-07, 11:24:03Critical (3)Started Unicast Maintenance Ranging - No Response received - T3 time-out;CM-MAC=9c:c9:eb:87:d9:b0;CMTS-MAC=00:01:5c:b7:10:91;CM-QOS=1.1;CM-VER=3.1;Time Not EstablishedCritical (3)No Ranging Response received - T3 time-out;CM-MAC=9c:c9:eb:87:d9:b0;CMTS-MAC=00:01:5c:b7:10:91;CM-QOS=1.1;CM-VER=3.1;Time Not EstablishedCritical (3)SYNC Timing Synchronization failure - Failed to acquire QAM/QPSK symbol timing;CM-MAC=9c:c9:eb:87:d9:b0;CMTS-MAC=00:00:00:00:00:00;CM-QOS=1.1;CM-VER=3.1;2022-03-07, 11:20:49Critical (3)Started Unicast Maintenance Ranging - No Response received - T3 time-out;CM-MAC=9c:c9:eb:87:d9:b0;CMTS-MAC=00:01:5c:b7:10:91;CM-QOS=1.1;CM-VER=3.1;&nbsp;

NightHawkNancy · Answer

plemans&nbsp;this is the only one I've got access to at the moment and was the one I had on originally.&nbsp;Antronix CMC2004H&nbsp;&nbsp;Is there a different one you'd recommend using?&nbsp;&nbsp;I've got a MicroCenter nearby...

plemans · Answer

You have errors in the cable connections page plus your logs are indicating issues.&nbsp;
Start with removing any amplifiers, signal attenuators, or splitters from the coax. From there check the line for kinks, damage, moisture in the line. Check the connectors for improperly made ends, foil touching the copper coax line, bad/old/cheap connectors, or corroded connections. Replace them if you do. If you can, simply connect the modem right where the coax comes into the home. This prevents wiring in the home from being the issue. I know you said you don't have an outlet but grab an extension cord and try the connection.&nbsp;
&nbsp;

NightHawkNancy · Answer

FURRYe38&nbsp;any suggestions on my issue here?

plemans · Answer

You've still got some indications of line problems in the logs. And now your power is a touch high.&nbsp;
Not sure what splitter you had in line but your power jumped significantly from removing the one you have.&nbsp;
Try putting a decent quality double splitter back in line. Maybe a triple.&nbsp;
Just make sure its a decent quality. the channels you had issues with (hz not just channel number) cleared up but now others have errors.&nbsp;
Try that first.&nbsp;
and once you do that, clear the logs out so we know that anything new on there is from after the change. Not sure if you're log has events from befor the change.&nbsp;
&nbsp;
&nbsp;
If it doesn't help, the isp might need to check the line.&nbsp;

Forum Discussion

C7800 Keeps Disconnecting and/or Very Slow

8 Replies