Community Forum

Help! Near continuous T3 and T4 timeouts

kb65
Regular Visitor

Help! Near continuous T3 and T4 timeouts

We recently purchased the Xfinity gigabit package and desperately need help as remote school starts for our family on Monday and I have exhausted other troubleshooting resources including voice, chat, and having a technician come onsite.

 

We are getting nearly continuous T3 time-out error messages in the log for our cable modem and don't even get a couple hours of reliable Internet connectivity. However, when we do get connectivity, it works fine and is very fast, but that has convinced the support personnel this is a local equipment issue.

 

However, I have tried connecting directly to the coaxial cable coming into our garage and bypassing wifi and it still happens. A technician also replaced the cable between the ground and what comes into our house when we first moved in and tested the underground cable that goes to a small box across the street and said it is fine. I have an Arris SB200 and a Netgear CM1000v2 (both log the same T3 errors.

 

I have included the error log and connection status from the CM1000v2 below. At this point we are desperate for a solution as we do not receive good cell reception and Xfinity is our only choice of broadband provider. Any help would be greatly appreciated!

 

*Error Log*

Time

Priority

Description

2020-08-20, 08:52:06

Notice (6)

DS profile assignment change. DS Chan ID: 32; Previous Profile: ; New Profile: 1 2 3.;CM-MAC=44:a5:6e:b4:a9:60;CMTS-MAC=00:01:5c:71:c0:48;CM-QOS=1.1;CM-VER=3.1;

2020-08-20, 08:51:58

Notice (6)

Honoring MDD; IP provisioning mode = IPv6

2020-08-20, 08:51:27

Critical (3)

No Ranging Response received - T3 time-out;CM-MAC=44:a5:6e:b4:a9:60;CMTS-MAC=00:01:5c:71:c0:48;CM-QOS=1.1;CM-VER=3.1;

2020-08-20, 08:51:17

Critical (3)

Received Response to Broadcast Maintenance Request, But no Unicast Maintenance opportunities received - T4 time out;CM-MAC=44:a5:6e:b4:a9:60;CMTS-MAC=00:01:5c:71:c0:48;CM-QOS=1.1;CM-VER=3.1;

2020-08-20, 08:51:17

Critical (3)

No Ranging Response received - T3 time-out;CM-MAC=44:a5:6e:b4:a9:60;CMTS-MAC=00:01:5c:71:c0:48;CM-QOS=1.1;CM-VER=3.1;

2020-08-20, 08:51:16

Critical (3)

Received Response to Broadcast Maintenance Request, But no Unicast Maintenance opportunities received - T4 time out;CM-MAC=44:a5:6e:b4:a9:60;CMTS-MAC=00:01:5c:71:c0:48;CM-QOS=1.1;CM-VER=3.1;

2020-08-20, 08:51:15

Critical (3)

No Ranging Response received - T3 time-out;CM-MAC=44:a5:6e:b4:a9:60;CMTS-MAC=00:01:5c:71:c0:48;CM-QOS=1.1;CM-VER=3.1;

2020-08-20, 08:51:14

Critical (3)

Received Response to Broadcast Maintenance Request, But no Unicast Maintenance opportunities received - T4 time out;CM-MAC=44:a5:6e:b4:a9:60;CMTS-MAC=00:01:5c:71:c0:48;CM-QOS=1.1;CM-VER=3.1;

2020-08-20, 08:46:55

Critical (3)

Started Unicast Maintenance Ranging - No Response received - T3 time-out;CM-MAC=44:a5:6e:b4:a9:60;CMTS-MAC=00:01:5c:71:c0:48;CM-QOS=1.1;CM-VER=3.1;

2020-08-20, 08:46:05

Notice (6)

DS profile assignment change. DS Chan ID: 32; Previous Profile: ; New Profile: 1 2 3.;CM-MAC=44:a5:6e:b4:a9:60;CMTS-MAC=00:01:5c:71:c0:48;CM-QOS=1.1;CM-VER=3.1;

2020-08-20, 08:45:55

Notice (6)

Honoring MDD; IP provisioning mode = IPv6

2020-08-20, 08:44:28

Critical (3)

No Ranging Response received - T3 time-out;CM-MAC=44:a5:6e:b4:a9:60;CMTS-MAC=00:01:5c:71:c0:48;CM-QOS=1.1;CM-VER=3.1;

2020-08-20, 08:44:17

Critical (3)

Received Response to Broadcast Maintenance Request, But no Unicast Maintenance opportunities received - T4 time out;CM-MAC=44:a5:6e:b4:a9:60;CMTS-MAC=00:01:5c:71:c0:48;CM-QOS=1.1;CM-VER=3.1;

2020-08-20, 08:39:59

Critical (3)

Started Unicast Maintenance Ranging - No Response received - T3 time-out;CM-MAC=44:a5:6e:b4:a9:60;CMTS-MAC=00:01:5c:71:c0:48;CM-QOS=1.1;CM-VER=3.1;

2020-08-20, 08:37:20

Notice (6)

DS profile assignment change. DS Chan ID: 32; Previous Profile: ; New Profile: 1 2 3.;CM-MAC=44:a5:6e:b4:a9:60;CMTS-MAC=00:01:5c:71:c0:48;CM-QOS=1.1;CM-VER=3.1;

2020-08-20, 08:37:08

Notice (6)

Honoring MDD; IP provisioning mode = IPv6

2020-08-20, 08:36:54

Critical (3)

Received Response to Broadcast Maintenance Request, But no Unicast Maintenance opportunities received - T4 time out;CM-MAC=44:a5:6e:b4:a9:60;CMTS-MAC=00:01:5c:71:c0:48;CM-QOS=1.1;CM-VER=3.1;

2020-08-20, 08:36:38

Critical (3)

No Ranging Response received - T3 time-out;CM-MAC=44:a5:6e:b4:a9:60;CMTS-MAC=00:01:5c:71:c0:48;CM-QOS=1.1;CM-VER=3.1;

2020-08-20, 08:35:42

Critical (3)

Started Unicast Maintenance Ranging - No Response received - T3 time-out;CM-MAC=44:a5:6e:b4:a9:60;CMTS-MAC=00:01:5c:71:c0:48;CM-QOS=1.1;CM-VER=3.1;

2020-08-20, 08:35:38

Notice (6)

DS profile assignment change. DS Chan ID: 32; Previous Profile: ; New Profile: 1 2 3.;CM-MAC=44:a5:6e:b4:a9:60;CMTS-MAC=00:01:5c:71:c0:48;CM-QOS=1.1;CM-VER=3.1;

2020-08-20, 08:35:29

Notice (6)

Honoring MDD; IP provisioning mode = IPv6

2020-08-20, 08:34:40

Critical (3)

No Ranging Response received - T3 time-out;CM-MAC=44:a5:6e:b4:a9:60;CMTS-MAC=00:01:5c:71:c0:48;CM-QOS=1.1;CM-VER=3.1;

2020-08-20, 08:34:30

Critical (3)

Received Response to Broadcast Maintenance Request, But no Unicast Maintenance opportunities received - T4 time out;CM-MAC=44:a5:6e:b4:a9:60;CMTS-MAC=00:01:5c:71:c0:48;CM-QOS=1.1;CM-VER=3.1;

2020-08-20, 08:34:26

Critical (3)

No Ranging Response received - T3 time-out;CM-MAC=44:a5:6e:b4:a9:60;CMTS-MAC=00:01:5c:71:c0:48;CM-QOS=1.1;CM-VER=3.1;

2020-08-20, 08:34:25

Critical (3)

Received Response to Broadcast Maintenance Request, But no Unicast Maintenance opportunities received - T4 time out;CM-MAC=44:a5:6e:b4:a9:60;CMTS-MAC=00:01:5c:71:c0:48;CM-QOS=1.1;CM-VER=3.1;

2020-08-20, 08:34:24

Critical (3)

No Ranging Response received - T3 time-out;CM-MAC=44:a5:6e:b4:a9:60;CMTS-MAC=00:01:5c:71:c0:48;CM-QOS=1.1;CM-VER=3.1;

2020-08-20, 08:34:24

Critical (3)

Received Response to Broadcast Maintenance Request, But no Unicast Maintenance opportunities received - T4 time out;CM-MAC=44:a5:6e:b4:a9:60;CMTS-MAC=00:01:5c:71:c0:48;CM-QOS=1.1;CM-VER=3.1;

2020-08-20, 08:34:23

Critical (3)

No Ranging Response received - T3 time-out;CM-MAC=44:a5:6e:b4:a9:60;CMTS-MAC=00:01:5c:71:c0:48;CM-QOS=1.1;CM-VER=3.1;

2020-08-20, 08:34:22

Critical (3)

Received Response to Broadcast Maintenance Request, But no Unicast Maintenance opportunities received - T4 time out;CM-MAC=44:a5:6e:b4:a9:60;CMTS-MAC=00:01:5c:71:c0:48;CM-QOS=1.1;CM-VER=3.1;

2020-08-20, 08:29:42

Critical (3)

Started Unicast Maintenance Ranging - No Response received - T3 time-out;CM-MAC=44:a5:6e:b4:a9:60;CMTS-MAC=00:01:5c:71:c0:48;CM-QOS=1.1;CM-VER=3.1;

2020-08-20, 08:28:52

Notice (6)

CM-STATUS message sent. Event Type Code: 24; Chan ID: 29; DSID: N/A; MAC Addr: N/A; OFDM/OFDMA Profile ID: 3.;CM-MAC=44:a5:6e:b4:a9:60;CMTS-MAC=00:01:5c:71:c0:48;CM-QOS=1.1;CM-VER=3.1;

2020-08-20, 08:28:27

Notice (6)

CM-STATUS message sent. Event Type Code: 16; Chan ID: 29; DSID: N/A; MAC Addr: N/A; OFDM/OFDMA Profile ID: 3.;CM-MAC=44:a5:6e:b4:a9:60;CMTS-MAC=00:01:5c:71:c0:48;CM-QOS=1.1;CM-VER=3.1;

2020-08-20, 08:28:03

Notice (6)

CM-STATUS message sent. Event Type Code: 8; Chan ID: 1 2 3; DSID: N/A; MAC Addr: N/A; OFDM/OFDMA Profile ID: N/A.;CM-MAC=44:a5:6e:b4:a9:60;CMTS-MAC=00:01:5c:71:c0:48;CM-QOS=1.1;CM-VER=3.1;

2020-08-20, 08:27:33

Notice (6)

CM-STATUS message sent. Event Type Code: 8; Chan ID: 2; DSID: N/A; MAC Addr: N/A; OFDM/OFDMA Profile ID: N/A.;CM-MAC=44:a5:6e:b4:a9:60;CMTS-MAC=00:01:5c:71:c0:48;CM-QOS=1.1;CM-VER=3.1;

2020-08-20, 08:26:01

Critical (3)

No Ranging Response received - T3 time-out;CM-MAC=44:a5:6e:b4:a9:60;CMTS-MAC=00:01:5c:71:c0:48;CM-QOS=1.1;CM-VER=3.1;

2020-08-20, 08:26:00

Critical (3)

16 consecutive T3 timeouts while trying to range on upstream channel 2;CM-MAC=44:a5:6e:b4:a9:60;CMTS-MAC=00:01:5c:71:c0:48;CM-QOS=1.1;CM-VER=3.1;

2020-08-20, 08:26:00

Critical (3)

Ranging Request Retries exhausted;CM-MAC=44:a5:6e:b4:a9:60;CMTS-MAC=00:01:5c:71:c0:48;CM-QOS=1.1;CM-VER=3.1;

2020-08-20, 08:25:31

Critical (3)

No Ranging Response received - T3 time-out;CM-MAC=44:a5:6e:b4:a9:60;CMTS-MAC=00:01:5c:71:c0:48;CM-QOS=1.1;CM-VER=3.1;

2020-08-20, 08:25:29

Critical (3)

16 consecutive T3 timeouts while trying to range on upstream channel 0;CM-MAC=44:a5:6e:b4:a9:60;CMTS-MAC=00:01:5c:71:c0:48;CM-QOS=1.1;CM-VER=3.1;

   

 

*Connection Status* 

 

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

Startup Procedure

Procedure

Status

Comment

Acquire Downstream Channel

579000000 Hz

Locked

Connectivity State

OK

Operational

Boot State

OK

Operational

Security

Enable

BPI+

IP Provisioning Mode

Honor MDD

IPv6 only

Downstream Bonded Channels

Channel

Lock Status

Modulation

Channel ID

Frequency

Power

SNR / MER

Unerrored Codewords

Correctable Codewords

Uncorrectable Codewords

1

Locked

QAM256

25

579000000 Hz

4.5 dBmV

42.0 dB

73670072

21

87

2

Locked

QAM256

1

417000000 Hz

3.5 dBmV

42.2 dB

48403514

16

0

3

Locked

QAM256

2

423000000 Hz

3.7 dBmV

42.1 dB

48421849

0

0

4

Locked

QAM256

3

429000000 Hz

3.7 dBmV

42.2 dB

48435469

0

0

5

Locked

QAM256

4

435000000 Hz

3.9 dBmV

42.1 dB

48453676

0

0

6

Locked

QAM256

5

447000000 Hz

3.4 dBmV

41.7 dB

48472963

0

0

7

Locked

QAM256

6

453000000 Hz

3.5 dBmV

41.7 dB

48493241

0

0

8

Locked

QAM256

7

459000000 Hz

3.5 dBmV

41.3 dB

48512055

0

0

9

Locked

QAM256

8

465000000 Hz

3.6 dBmV

41.6 dB

48531795

0

0

10

Locked

QAM256

9

471000000 Hz

3.7 dBmV

41.3 dB

48550532

7

0

11

Locked

QAM256

10

483000000 Hz

3.8 dBmV

41.4 dB

48570310

0

0

12

Locked

QAM256

11

489000000 Hz

4.1 dBmV

41.4 dB

48588559

0

0

13

Locked

QAM256

12

495000000 Hz

4.0 dBmV

41.4 dB

48608408

0

0

14

Locked

QAM256

13

507000000 Hz

4.1 dBmV

41.1 dB

48628534

0

0

15

Locked

QAM256

14

513000000 Hz

4.1 dBmV

41.4 dB

48648065

0

0

16

Locked

QAM256

15

519000000 Hz

4.1 dBmV

41.5 dB

48666997

0

0

17

Locked

QAM256

16

525000000 Hz

4.0 dBmV

41.6 dB

48685798

0

0

18

Locked

QAM256

17

531000000 Hz

4.1 dBmV

41.5 dB

48704972

0

0

19

Locked

QAM256

18

537000000 Hz

4.0 dBmV

41.5 dB

48724142

0

0

20

Locked

QAM256

19

543000000 Hz

4.2 dBmV

41.7 dB

48742670

0

0

21

Locked

QAM256

20

549000000 Hz

4.0 dBmV

41.5 dB

48763535

0

0

22

Locked

QAM256

21

555000000 Hz

4.2 dBmV

41.7 dB

48783099

0

0

23

Locked

QAM256

22

561000000 Hz

4.3 dBmV

41.8 dB

48801994

0

0

24

Locked

QAM256

23

567000000 Hz

4.2 dBmV

41.8 dB

48820863

0

0

25

Locked

QAM256

24

573000000 Hz

4.2 dBmV

41.3 dB

48839849

0

0

26

Locked

QAM256

26

585000000 Hz

4.7 dBmV

42.0 dB

48859001

0

0

27

Locked

QAM256

27

591000000 Hz

4.7 dBmV

41.8 dB

48861923

0

0

28

Locked

QAM256

28

597000000 Hz

4.6 dBmV

41.8 dB

48863028

0

0

29

Locked

QAM256

30

603000000 Hz

4.2 dBmV

41.7 dB

48790069

0

0

30

Locked

QAM256

31

609000000 Hz

4.2 dBmV

41.8 dB

48738603

0

0

31

Locked

QAM256

32

615000000 Hz

4.3 dBmV

41.8 dB

48752517

0

0

32

Not Locked

Unknown

0

0 Hz

0.0 dBmV

0.0 dB

0

0

0

Upstream Bonded Channels

Channel

Lock Status

Modulation

Channel ID

Frequency

Power

1

Locked

ATDMA

1

17300000 Hz

48.0 dBmV

2

Locked

ATDMA

2

23700000 Hz

45.5 dBmV

3

Locked

ATDMA

3

30100000 Hz

44.0 dBmV

4

Locked

ATDMA

4

36500000 Hz

42.3 dBmV

5

Not Locked

Unknown

0

0 Hz

0.0 dBmV

6

Not Locked

Unknown

0

0 Hz

0.0 dBmV

7

Not Locked

Unknown

0

0 Hz

0.0 dBmV

8

Not Locked

Unknown

0

0 Hz

0.0 dBmV

Downstream OFDM Channels

Channel

Lock Status

Modulation / Profile ID

Channel ID

Frequency

Power

SNR / MER

Active Subcarrier Number Range

Unerrored Codewords

Correctable Codewords

Uncorrectable Codewords

1

Locked

0, 1, 2, 3

29

690000000 Hz

2.5 dBmV

39.8 dB

1108 ~ 2987

794291

782004

1

2

Not Locked

0

0

0 Hz

4.0 dBmV

0.0 dB

0 ~ 4095

0

0

0

Upstream OFDMA Channels

Channel

Lock Status

Modulation / Profile ID

Channel ID

Frequency

Power

1

Not Locked

Unknown

0

0 Hz

0 dBmV

2

Not Locked

Unknown

0

0 Hz

0 dBmV

Current System Time: Thu Aug 20 08:56:23 2020 

System Up Time: 0:54:25

kb65
Regular Visitor

Re: Help! Near continuous T3 and T4 timeouts

Following up with more info. What I am seeing is that when the modem tries to reconnect, the downstream is established quickly, but the upstream light keeps blinking for many minutes at a time - sometimes as long as an hour. Eventually the upstream connection is established, then Internet access is restored.

 

I am also seeing pairs of error messages in the CM1000v2 cable modem log as follows:

 

Time

Priority

Description

2020-08-21, 04:40:07

Warning (5)

Dynamic Range Window violation

2020-08-21, 04:40:07

Warning (5)

RNG-RSP CCAP Commanded Power Exceeds Value Corresponding to the Top of the DRW;CM-MAC=44:a5:6e:b4:a9:60;CMTS-MAC=00:01:5c:71:c0:48;CM-QOS=1.1;CM-VER=3.1;

2020-08-21, 04:40:07

Warning (5)

Dynamic Range Window violation

2020-08-21, 04:40:07

Warning (5)

RNG-RSP CCAP Commanded Power Exceeds Value Corresponding to the Top of the DRW;CM-MAC=44:a5:6e:b4:a9:60;CMTS-MAC=00:01:5c:71:c0:48;CM-QOS=1.1;CM-VER=3.1;

2020-08-21, 04:37:45

Warning (5)

Dynamic Range Window violation

2020-08-21, 04:37:45

Warning (5)

RNG-RSP CCAP Commanded Power in Excess of 6 dB Below the Value Corresponding to the Top of the DRW;CM-MAC=44:a5:6e:b4:a9:60;CMTS-MAC=00:01:5c:71:c0:48;CM-QOS=1.1;CM-VER=3.1;

 

 

Downstream levels are consistent, but the upstream power varies from the low 30's to the upper 50's. Here's what it was this morning at about 8:00 AM:

 

Upstream Bonded Channels

 

Channel

Lock Status

Modulation

Channel ID

Frequency

Power

1

Locked

ATDMA

1

17300000 Hz

51.8 dBmV

2

Locked

ATDMA

2

23700000 Hz

49.8 dBmV

3

Locked

ATDMA

3

30100000 Hz

48.0 dBmV

4

Locked

ATDMA

4

36500000 Hz

46.3 dBmV

5

Not Locked

Unknown

0

0 Hz

0.0 dBmV

6

Not Locked

Unknown

0

0 Hz

0.0 dBmV

7

Not Locked

Unknown

0

0 Hz

0.0 dBmV

8

Not Locked

Unknown

0

0 Hz

0.0 dBmV

 

Yesterday afternoon at about 4:00 PM they were as follows. Also notice the "Partial Service" note - that's not always present and seems to indicate a service problem.

 

Upstream Bonded Channels (Partial Service)

 

Channel

Lock Status

Modulation

Channel ID

Frequency

Power

1

Locked

ATDMA

1

17300000 Hz

59.0 dBmV

2

Locked

ATDMA

2

23700000 Hz

53.8 dBmV

3

Locked

ATDMA

3

30100000 Hz

59.0 dBmV

4

Locked

ATDMA

4

36500000 Hz

57.0 dBmV

5

Not Locked

Unknown

0

0 Hz

0.0 dBmV

6

Not Locked

Unknown

0

0 Hz

0.0 dBmV

7

Not Locked

Unknown

0

0 Hz

0.0 dBmV

8

Not Locked

Unknown

0

0 Hz

0.0 dBmV

 

Of course, I can only see this status page when we have service, so I have no idea what the levels are like when the modem is trying to establish connectivity. We also see service go out consistently around 9:00 AM daily, but before then it is good. That makes me think something his happening outside of our home to affect the signal being sent to our home... any thoughts?

 

Thank you

marksalmonllc
Contributor

Re: Help! Near continuous T3 and T4 timeouts

This is a wierd one. Have you tried using the XB7 modem? I am using that and I have solid service. 

EG
Expert

Re: Help! Near continuous T3 and T4 timeouts

It's not a  "weird one". It's definitely an intermittent upstream / return path impairment of some sort (typically noise ingress or a line / hardware / infrastructure problem somewhere).  The power levels should not be making such wide intermittent fluctuations. Prior to the last one, some channels were almost out of spec. On the last one, some were WAY out of spec. IMO, it would be best to get a tech out to investigate / correct this issue. 

 

 Bear in mind that if the premises facing techs can not find or fix a problem at your home, it is they who are responsible for escalating it to their line / network / maintenance dept. techs. The problem may lie beyond your home in the local neighborhood infrastructure somewhere but it is their S.O.P. to start at the home.
Good luck !



I am not a Comcast Employee.
I am a Customer Expert 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.
Was your question answered? Mark the post as Best Answer!
kb65
Regular Visitor

Re: Help! Near continuous T3 and T4 timeouts

Thank you for the follow up. I'll get a tech out again. Last time they were very polite, but just blamed my home wifi equipment, which is also what’s happened over chat and voice support calls. I’ll impress upon the tech that you confirmed this is an intermittent upstream / return path impairment and that if they don't find a problem with the line coming into the house they need to escalate (which they declined to do previously).

 

Also, the cable modem is connected directly to what comes into the house and isn't going through any household cabling. 

 

I'll post a follow up once I can get a tech out. Please let me know if you have any advice about how to convince the tech to escalate.

 

Thank you

EG
Expert

Re: Help! Near continuous T3 and T4 timeouts

Just be firm but polite that this is an ongoing issue and that they please write up a trouble ticket for the line maintenance department.

 

Good luck !



I am not a Comcast Employee.
I am a Customer Expert 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.
Was your question answered? Mark the post as Best Answer!
djduh
New Poster

Re: Help! Near continuous T3 and T4 timeouts

I am having this exact same issue you are not alone please update when you have more information on a solution. I will as well. I called corporate 2 days ago and they submitted a ticket for me and said they will call with a follow up yesterday or today but have not called yet. I am surely convinced this issue is coming from the line connected at the pole
djduh
New Poster

Re: Help! Near continuous T3 and T4 timeouts

also this issue has happened with their modem and my modem so it can't be the modems fault.
marksalmonllc
Contributor

Re: Help! Near continuous T3 and T4 timeouts

You can eliminate the "its intereference from your home wif fi (BS IMHO) by using hard wired connectivity if you can to some of your computers. if you cannot then i agree, it has to be upstrem of your home. Their lines maybe getiting intereferance from power lines. Although it shoudl be fiber from their site to the box that feeds your neighbourhood. have you talked to anyt of your neighbors to see if they have comcast service and if they have the same issues?

kb65
Regular Visitor

Re: Help! Near continuous T3 and T4 timeouts

The technician came out this weekend. Unlike last time, I had the upstream and downstream power readings from my cable modem logs and that helped me get passed them asking about my home network since those power readings were fluctuating and out of spec. I also pointed out that the modem loses connectivity even if nothing from my home is connected to it, which was helpful when I was on the phone trying to convince support to send out a tech, which they were reluctant to do (I had to be very insistent).

 

The tech checked every single physical component from the cable modem out and eventually found that the bulkhead from the cable that runs under and across the street needs to be replaced and submitted an emergency order for the replacement. They determined that by switching my house temporarily over to a different bulkhead that normally goes to a different house on our side of the street. That immediately solved the problem and no errors were logged at all for the duration of the test (usually I get them every few minutes), so I'm confident the new cable / bulkhead will resolve the issue for us.

 

In case anyone else has issues like this, one of the main challenges is that it is intermittent and when it does work the speed up and down is fine. I think that is what lead to the first tech we had out when the problem originally started (but wasn’t as severe) to blame my home networking equipment as he saw good speeds when he ran his test. This tech was willing to look at the power readings on his end and see that they were, in fact, out of spec (matching what I saw on the cable modem), and so focused on the physical infrastructure instead and found the real problem.

 

Thank you again to everyone who replied!

marksalmonllc
Contributor

Re: Help! Near continuous T3 and T4 timeouts

Yeah!!! glad you are on the road to recovery, i will share your "fix" with a friend who is having the same symptoms. Keep us updated on status. 

tojetojarane
New Poster

Re: Help! Near continuous T3 and T4 timeouts

Arris modemds are manufactured for 45-51DB upstream levels which is really high. Comcast will tell your that 38-48 is withing acceptable range. For that reason I ditched my Arris mode for a netgear nighthawk which is withing the 38-48 range and i've had no issues. If you look at Arris reviews online they are notorious for dropped connections and constant reboots and T3 timeout errors. Hope this helps

EG
Expert

Re: Help! Near continuous T3 and T4 timeouts

Dead thread from last year now being closed.



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