U

Visitor

 • 

2 Messages

Wednesday, January 25th, 2023 5:39 AM

MDD message timeout - Internet Drops Out All The Time

I have been dealing with random internet dropouts for the last 6 months. The internet just disconnects for 30 sec or so. It happens roughly every hour and is super frustrating.

I had several Xfinity technicians come to my house but none was able to fix the problem. Here is what the Xfinity technicians have done so far:
- Replaced various splitters and connectors

- Replaced entire cable from the street pole to the house

- Suggested to get a new modem, specifically suggested Netgear CM 1200 (previously had a Netgear CM 700)
- Replaced TV box (not sure why they did that)

I also tried several things myself:

- Connected laptop directly to modem via ethernet cable, which didn't fix the problem (conclusion: the router cannot be the issue)
- Connected modem directly with the main cable coming from the street pole (no splitters involved)
- Tried different modem locations at different power outlets

None of the above fixed the issue. At this point I'm convinced that the issue must be on the Xfinity side, i.e., the signal coming to our house. Suspiciously, the issue started when XFinity upgraded the internet speeds in my area. The last Xfinity technician (number 4 in the last 2 months) that came to my house mentioned that they changed from satellite to fiber in my area to increase speeds. The technician also promised that he would refer my case to the line techs and they would check the line and distribution node. But I haven't heard back from Xfinity and the issue obviously still persists.

The issue is super frustrating and I'm very disappointed with the lack of care, expertise, and quality of Xfinity. I've had Xfinity for many many years but at this point I'm really considering trying out AT&T. Anyways, maybe someone has a good suggestion what I could do.

Here is a recent log and connection status from my CM 1200 modem (every time "MDD message timeout" happens, the internet drops out):

Time

Priority

Description

Tue Jan 24 22:22:10 2023

Notice (6)

CM-STATUS message sent. Event Type Code: 4; Chan ID: 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 193; DSID: N/A; MAC Addr: N/A; OFDM/OFDMA Profile ID: N/A.;CM-MAC=[];CMTS-MAC=[];CM-QOS=1.1;CM-VER=3.1;

Tue Jan 24 22:21:29 2023

Warning (5)

MDD message timeout;CM-MAC=[];CMTS-MAC=[];CM-QOS=1.1;CM-VER=3.1;

Tue Jan 24 20:48:09 2023

Notice (6)

CM-STATUS message sent. Event Type Code: 4; Chan ID: 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 193; DSID: N/A; MAC Addr: N/A; OFDM/OFDMA Profile ID: N/A.;CM-MAC=[];CMTS-MAC=[];CM-QOS=1.1;CM-VER=3.1;

Tue Jan 24 20:47:28 2023

Warning (5)

MDD message timeout;CM-MAC=[];CMTS-MAC=[];CM-QOS=1.1;CM-VER=3.1;

Tue Jan 24 20:26:58 2023

Notice (6)

CM-STATUS message sent. Event Type Code: 4; Chan ID: 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 193; DSID: N/A; MAC Addr: N/A; OFDM/OFDMA Profile ID: N/A.;CM-MAC=[];CMTS-MAC=[];CM-QOS=1.1;CM-VER=3.1;

Tue Jan 24 20:26:19 2023

Warning (5)

MDD message timeout;CM-MAC=[];CMTS-MAC=[];CM-QOS=1.1;CM-VER=3.1;

Tue Jan 24 18:33:21 2023

Notice (6)

CM-STATUS message sent. Event Type Code: 4; Chan ID: 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 193; DSID: N/A; MAC Addr: N/A; OFDM/OFDMA Profile ID: N/A.;CM-MAC=[];CMTS-MAC=[];CM-QOS=1.1;CM-VER=3.1;

Tue Jan 24 18:32:40 2023

Warning (5)

MDD message timeout;CM-MAC=[];CMTS-MAC=[];CM-QOS=1.1;CM-VER=3.1;

Tue Jan 24 15:45:28 2023

Notice (6)

CM-STATUS message sent. Event Type Code: 4; Chan ID: 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 193; DSID: N/A; MAC Addr: N/A; OFDM/OFDMA Profile ID: N/A.;CM-MAC=[];CMTS-MAC=[];CM-QOS=1.1;CM-VER=3.1;

Tue Jan 24 15:44:46 2023

Warning (5)

MDD message timeout;CM-MAC=[];CMTS-MAC=[];CM-QOS=1.1;CM-VER=3.1;

Tue Jan 24 15:24:08 2023

Notice (6)

CM-STATUS message sent. Event Type Code: 4; Chan ID: 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 193; DSID: N/A; MAC Addr: N/A; OFDM/OFDMA Profile ID: N/A.;CM-MAC=[];CMTS-MAC=[];CM-QOS=1.1;CM-VER=3.1;

Tue Jan 24 15:23:27 2023

Warning (5)

MDD message timeout;CM-MAC=[];CMTS-MAC=[];CM-QOS=1.1;CM-VER=3.1;

Tue Jan 24 14:54:06 2023

Notice (6)

CM-STATUS message sent. Event Type Code: 4; Chan ID: 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 193; DSID: N/A; MAC Addr: N/A; OFDM/OFDMA Profile ID: N/A.;CM-MAC=[];CMTS-MAC=[];CM-QOS=1.1;CM-VER=3.1;

Tue Jan 24 14:53:27 2023

Warning (5)

MDD message timeout;CM-MAC=[];CMTS-MAC=[];CM-QOS=1.1;CM-VER=3.1;

Tue Jan 24 14:44:59 2023

Notice (6)

CM-STATUS message sent. Event Type Code: 4; Chan ID: 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 193; DSID: N/A; MAC Addr: N/A; OFDM/OFDMA Profile ID: N/A.;CM-MAC=[];CMTS-MAC=v;CM-QOS=1.1;CM-VER=3.1;

Tue Jan 24 14:44:18 2023

Warning (5)

MDD message timeout;CM-MAC=[];CMTS-MAC=[];CM-QOS=1.1;CM-VER=3.1;

Tue Jan 24 13:27:22 2023

Notice (6)

CM-STATUS message sent. Event Type Code: 4; Chan ID: 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 193; DSID: N/A; MAC Addr: N/A; OFDM/OFDMA Profile ID: N/A.;CM-MAC=;CMTS-MAC=;CM-QOS=1.1;CM-VER=3.1;

Tue Jan 24 13:26:41 2023

Warning (5)

MDD message timeout;CM-MAC=;CMTS-MAC=;CM-QOS=1.1;CM-VER=3.1;

Tue Jan 24 12:49:25 2023

Notice (6)

CM-STATUS message sent. Event Type Code: 4; Chan ID: 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 193; DSID: N/A; MAC Addr: N/A; OFDM/OFDMA Profile ID: N/A.;CM-MAC=;CMTS-MAC=;CM-QOS=1.1;CM-VER=3.1;

Tue Jan 24 12:48:46 2023

Warning (5)

MDD message timeout;CM-MAC=;CMTS-MAC=;CM-QOS=1.1;CM-VER=3.1;

Tue Jan 24 11:28:29 2023

Notice (6)

CM-STATUS message sent. Event Type Code: 4; Chan ID: 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 193; DSID: N/A; MAC Addr: N/A; OFDM/OFDMA Profile ID: N/A.;CM-MAC=;CMTS-MAC=;CM-QOS=1.1;CM-VER=3.1;

Tue Jan 24 11:27:48 2023

Warning (5)

MDD message timeout;CM-MAC=;CMTS-MAC=;CM-QOS=1.1;CM-VER=3.1;

Tue Jan 24 10:35:52 2023

Notice (6)

CM-STATUS message sent. Event Type Code: 4; Chan ID: 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 193; DSID: N/A; MAC Addr: N/A; OFDM/OFDMA Profile ID: N/A.;CM-MAC=;CMTS-MAC=;CM-QOS=1.1;CM-VER=3.1;

Tue Jan 24 10:35:11 2023

Warning (5)

MDD message timeout;CM-MAC=;CMTS-MAC=;CM-QOS=1.1;CM-VER=3.1;

Tue Jan 24 09:50:24 2023

Notice (6)

CM-STATUS message sent. Event Type Code: 4; Chan ID: 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 193; DSID: N/A; MAC Addr: N/A; OFDM/OFDMA Profile ID: N/A.;CM-MAC=;CMTS-MAC=;CM-QOS=1.1;CM-VER=3.1;

Tue Jan 24 09:49:43 2023

Warning (5)

MDD message timeout;CM-MAC=;CMTS-MAC=;CM-QOS=1.1;CM-VER=3.1;

Tue Jan 24 09:47:18 2023

Notice (6)

CM-STATUS message sent. Event Type Code: 4; Chan ID: 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 193; DSID: N/A; MAC Addr: N/A; OFDM/OFDMA Profile ID: N/A.;CM-MAC=;CMTS-MAC=;CM-QOS=1.1;CM-VER=3.1;

Tue Jan 24 09:46:39 2023

Warning (5)

MDD message timeout;CM-MAC=;CMTS-MAC=;CM-QOS=1.1;CM-VER=3.1;

Tue Jan 24 09:41:02 2023

Notice (6)

CM-STATUS message sent. Event Type Code: 4; Chan ID: 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 193; DSID: N/A; MAC Addr: N/A; OFDM/OFDMA Profile ID: N/A.;CM-MAC=;CMTS-MAC=;CM-QOS=1.1;CM-VER=3.1;

Tue Jan 24 09:40:23 2023

Warning (5)

MDD message timeout;CM-MAC=;CMTS-MAC=;CM-QOS=1.1;CM-VER=3.1;

Tue Jan 24 07:39:07 2023

Notice (6)

CM-STATUS message sent. Event Type Code: 4; Chan ID: 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 193; DSID: N/A; MAC Addr: N/A; OFDM/OFDMA Profile ID: N/A.;CM-MAC=;CMTS-MAC=;CM-QOS=1.1;CM-VER=3.1;

Tue Jan 24 07:38:26 2023

Warning (5)

MDD message timeout;CM-MAC=;CMTS-MAC=;CM-QOS=1.1;CM-VER=3.1;

Tue Jan 24 07:21:44 2023

Notice (6)

CM-STATUS message sent. Event Type Code: 4; Chan ID: 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 193; DSID: N/A; MAC Addr: N/A; OFDM/OFDMA Profile ID: N/A.;CM-MAC=;CMTS-MAC=;CM-QOS=1.1;CM-VER=3.1;

Tue Jan 24 07:21:05 2023

Warning (5)

MDD message timeout;CM-MAC=;CMTS-MAC=;CM-QOS=1.1;CM-VER=3.1;

Tue Jan 24 06:54:28 2023

Notice (6)

CM-STATUS message sent. Event Type Code: 4; Chan ID: 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 193; DSID: N/A; MAC Addr: N/A; OFDM/OFDMA Profile ID: N/A.;CM-MAC=;CMTS-MAC=;CM-QOS=1.1;CM-VER=3.1;

Tue Jan 24 06:53:47 2023

Warning (5)

MDD message timeout;CM-MAC=;CMTS-MAC=;CM-QOS=1.1;CM-VER=3.1;

Tue Jan 24 04:32:07 2023

Notice (6)

CM-STATUS message sent. Event Type Code: 4; Chan ID: 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 193; DSID: N/A; MAC Addr: N/A; OFDM/OFDMA Profile ID: N/A.;CM-MAC=;CMTS-MAC=;CM-QOS=1.1;CM-VER=3.1;

Tue Jan 24 04:31:25 2023

Warning (5)

MDD message timeout;CM-MAC=;CMTS-MAC=;CM-QOS=1.1;CM-VER=3.1;

Tue Jan 24 02:03:28 2023

Notice (6)

CM-STATUS message sent. Event Type Code: 4; Chan ID: 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 193; DSID: N/A; MAC Addr: N/A; OFDM/OFDMA Profile ID: N/A.;CM-MAC=;CMTS-MAC=;CM-QOS=1.1;CM-VER=3.1;

Tue Jan 24 02:02:47 2023

Warning (5)

MDD message timeout;CM-MAC=;CMTS-MAC=;CM-QOS=1.1;CM-VER=3.1;

Procedure

Status

Comment

Acquire Downstream Channel

591000000 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

28

591000000 Hz

11.2 dBmV

45.8 dB

126

417

2

Locked

QAM256

13

501000000 Hz

11.4 dBmV

45.3 dB

1283

1870

3

Locked

QAM256

14

507000000 Hz

11.5 dBmV

46 dB

1200

3690

4

Locked

QAM256

15

513000000 Hz

11.5 dBmV

46.3 dB

1385

3882

5

Locked

QAM256

16

519000000 Hz

11.5 dBmV

46.2 dB

1334

3618

6

Locked

QAM256

17

525000000 Hz

11.4 dBmV

45.7 dB

58

351

7

Locked

QAM256

18

531000000 Hz

11.3 dBmV

46.2 dB

1517

3567

8

Locked

QAM256

19

537000000 Hz

11.4 dBmV

46.2 dB

1304

3430

9

Locked

QAM256

20

543000000 Hz

11.5 dBmV

46.3 dB

1261

3638

10

Locked

QAM256

21

549000000 Hz

11.3 dBmV

46.2 dB

1543

3842

11

Locked

QAM256

22

555000000 Hz

11.3 dBmV

46 dB

1289

3576

12

Locked

QAM256

23

561000000 Hz

11.4 dBmV

46 dB

1264

3367

13

Locked

QAM256

24

567000000 Hz

11.2 dBmV

46 dB

1602

4068

14

Locked

QAM256

25

573000000 Hz

11 dBmV

45.8 dB

1655

5289

15

Locked

QAM256

26

579000000 Hz

11.4 dBmV

46 dB

1450

3927

16

Locked

QAM256

27

585000000 Hz

11.3 dBmV

45.9 dB

1453

3902

17

Locked

QAM256

29

597000000 Hz

11.3 dBmV

45.8 dB

1551

4232

18

Locked

QAM256

30

603000000 Hz

11.2 dBmV

45.7 dB

1385

3979

19

Locked

QAM256

31

609000000 Hz

11.1 dBmV

45.8 dB

1560

3910

20

Locked

QAM256

32

615000000 Hz

11.2 dBmV

45.8 dB

1583

4518

21

Locked

QAM256

33

621000000 Hz

11.4 dBmV

45.8 dB

1607

5518

22

Locked

QAM256

34

627000000 Hz

11.3 dBmV

45.6 dB

1728

5693

23

Locked

QAM256

35

633000000 Hz

11.4 dBmV

45.7 dB

1464

3324

24

Locked

QAM256

36

639000000 Hz

11.7 dBmV

45.7 dB

1548

4985

25

Locked

QAM256

37

645000000 Hz

11.7 dBmV

45.8 dB

1682

5370

26

Locked

QAM256

38

651000000 Hz

11.8 dBmV

45.9 dB

1720

4462

27

Locked

QAM256

39

657000000 Hz

11.9 dBmV

46 dB

1470

3353

28

Locked

QAM256

40

663000000 Hz

12.2 dBmV

46 dB

1667

5835

29

Locked

QAM256

41

669000000 Hz

12.2 dBmV

46.1 dB

1615

4043

30

Locked

QAM256

42

675000000 Hz

12.2 dBmV

45.2 dB

1468

3645

31

Locked

QAM256

43

681000000 Hz

12.4 dBmV

46.1 dB

1450

3831

32

Locked

QAM256

44

687000000 Hz

12.6 dBmV

46.1 dB

1332

3483

Upstream Bonded Channels

Channel

Lock Status

US Channel Type

Channel ID

Symbol Rate

Frequency

Power

1

Locked

ATDMA

17

5120 Ksym/sec

16400000 Hz

44.5 dBmV

2

Locked

ATDMA

18

5120 Ksym/sec

22800000 Hz

43.8 dBmV

3

Locked

ATDMA

19

5120 Ksym/sec

29200000 Hz

43 dBmV

4

Locked

ATDMA

20

5120 Ksym/sec

35600000 Hz

42.5 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

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

193

957000000 Hz

11.4 dBmV

44.8 dB

148 ~ 3947

1696812891

13934641

2307

2

Not Locked

0

0

0 Hz

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

0

0

0 Hz

0 dBmV

2

Not Locked

0

0

0 Hz

0 dBmV





Also: I found several recent posts of people that have the same or similar issue. Here are some examples:

- https://www.reddit.com/r/Comcast_Xfinity/comments/zemwz2/mdd_message_timeout/

- https://forums.xfinity.com/conversations/your-home-network/semifrequent-mdd-message-timeout-which-leads-to-high-packet-loss-events-disconnects/6282e67a855f616353ae34a9
- https://forums.businesshelp.comcast.com/conversations/connectivity/multiple-drop-outs-daily/5fe0a648c5375f08cd99fe87



EG

Expert

 • 

97.7K Messages

10 days ago

Please redact all of the CM MAC and the CMTS MAC addresses in your error log entries for your privacy. They are considered to be personal information. The posting of personally identifiable information is a violation of their forum guidelines. The forum bot will not allow your post to be seen publically. It flagged your post as "Private".

Visitor

 • 

2 Messages

@EG​ Done. I removed all of the CM MAC and the CMTS MAC addresses

forum icon

New to the Community?

Start Here