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Slower than advertised internet speeds
I have been dealing with slower than advertised speeds for almost a week now. I've replaced my modem (Arris SB8200) with a new SB8200 and comcast was unable to register it saying the MAC was invalid (it wasn't). They thought it may be due to me having voice service but not having a voice compatible modem. Fine. I bought an Arris T25 (self owned still) and they were able to register it without any issues. However the issue is persisting. On my home network I'm getting about 140mbps down/40mbps up (speedtest.net, fast.com, speedtest command line). I've taken my modem to the basement at the Point of Entry (PoE)and hooked it directly up. I'm still getting about 300mbps (this is circumventing my router and modem, using a onboard gig NIC). I've had Comcast refresh the signal multiple times. I had a tech come out this morning and test my coax run to my modem, the coax to the PoE, and even the easement in my neighbor's yard. He stated they were seeing full Gig down and 40mbps up, he tested coax and ethernet with his device. I even pulled a spare router off the shelf and hooked it up to the modem. Using his device he claimed to get 1G down, I hooked up another laptop (this is #3) to that other router and still getting the same speeds. He saw me do all of the speed tests without any of my own networking in between and he had no suggestions on what to do. I'm at a loss here since I've replaced the modem multiple times and seeing the same results. I upgraded to gig in October and it did used to work pulling gig on my network. I'm not seeing any type of packet loss (ping, speedtests, etc.) and I am gettng the advertised upload speed. I think I'll also try to reach out to Arris, but I thought I would see if anyone had any recommendations or have seen this before. I'm a systems engineer by trade so I've tried everything I could think of from a troubleshooting perspective before even calling comcast, but now I'm at a loss and open to any suggestions.
Output from the modem (Arris T25)
Downstream QAM
DCID Freq Power SNR Modulation Octets Correcteds Uncorrectables
Downstream 1 20 507.00 MHz 2.50 dBmV 40.37 dB 256QAM 433367328 0 0
Downstream 2 4 405.00 MHz 2.90 dBmV 40.37 dB 256QAM 472927992 5 0
Downstream 3 5 411.00 MHz 2.80 dBmV 40.37 dB 256QAM 170171391 2 0
Downstream 4 6 417.00 MHz 2.60 dBmV 40.37 dB 256QAM 169801659 0 0
Downstream 5 7 423.00 MHz 3.00 dBmV 40.37 dB 256QAM 168696132 0 0
Downstream 6 8 429.00 MHz 2.80 dBmV 40.37 dB 256QAM 126942429 0 0
Downstream 7 9 435.00 MHz 2.80 dBmV 40.95 dB 256QAM 172328872 0 0
Downstream 8 10 441.00 MHz 2.70 dBmV 40.37 dB 256QAM 173158182 0 0
Downstream 9 11 447.00 MHz 2.60 dBmV 40.37 dB 256QAM 141737428 0 0
Downstream 10 12 453.00 MHz 2.50 dBmV 40.37 dB 256QAM 475496732 0 0
Downstream 11 13 459.00 MHz 2.40 dBmV 40.95 dB 256QAM 180162590 0 0
Downstream 12 14 465.00 MHz 2.50 dBmV 40.37 dB 256QAM 178853282 0 0
Downstream 13 15 471.00 MHz 2.40 dBmV 40.37 dB 256QAM 172558812 0 0
Downstream 14 16 477.00 MHz 2.70 dBmV 40.95 dB 256QAM 88312727 0 0
Downstream 15 17 483.00 MHz 2.40 dBmV 40.37 dB 256QAM 59762801 0 1
Downstream 16 18 489.00 MHz 2.30 dBmV 40.37 dB 256QAM 53233672 3 0
Downstream 17 19 495.00 MHz 2.20 dBmV 40.37 dB 256QAM 64762026 16 40
Downstream 18 21 513.00 MHz 2.20 dBmV 40.37 dB 256QAM 105699016 1 0
Downstream 19 22 519.00 MHz 2.00 dBmV 40.95 dB 256QAM 106156629 6 0
Downstream 20 23 525.00 MHz 1.80 dBmV 40.37 dB 256QAM 110712891 0 0
Downstream 21 24 531.00 MHz 1.70 dBmV 40.37 dB 256QAM 717308085 0 0
Downstream 22 25 537.00 MHz 1.30 dBmV 38.98 dB 256QAM 68857647 0 0
Downstream 23 26 543.00 MHz 0.70 dBmV 38.98 dB 256QAM 72832506 0 0
Downstream 24 27 549.00 MHz 0.20 dBmV 38.98 dB 256QAM 70688742 0 0
Downstream 25 28 555.00 MHz -0.30 dBmV 38.98 dB 256QAM 80817124 0 0
Downstream 26 29 561.00 MHz -0.80 dBmV 38.98 dB 256QAM 101881152 0 0
Downstream 27 30 567.00 MHz -0.90 dBmV 38.98 dB 256QAM 106620413 0 0
Downstream 28 31 573.00 MHz -0.70 dBmV 38.98 dB 256QAM 104463760 7 0
Downstream 29 32 579.00 MHz -1.10 dBmV 38.98 dB 256QAM 76043645 8 0
Downstream 30 33 585.00 MHz -0.90 dBmV 38.61 dB 256QAM 113254694 0 0
Downstream 31 34 591.00 MHz -0.90 dBmV 38.98 dB 256QAM 127933977 1 0
Reset FEC Counters
Downstream OFDM
FFT Type Channel Width(MHz) # of Active Subcarriers First Active Subcarrier(MHz) Last Active Subcarrier(MHz) Average RxMER(dB)
Pilot PLC Data
Downstream 2 4K 94 1880 673 766 48 42 42
Upstream QAM
UCID Freq Power Channel Type Symbol Rate Modulation
Upstream 1 4 36.50 MHz 36.50 dBmV DOCSIS2.0 (ATDMA) 5120 kSym/s 64QAM
Upstream 2 5 41.20 MHz 40.00 dBmV DOCSIS2.0 (ATDMA) 1280 kSym/s 64QAM
Upstream 3 3 30.10 MHz 37.00 dBmV DOCSIS2.0 (ATDMA) 5120 kSym/s 64QAM
Upstream 4 2 23.70 MHz 37.00 dBmV DOCSIS2.0 (ATDMA) 5120 kSym/s 64QAM
Upstream 5 1 17.30 MHz 36.75 dBmV DOCSIS2.0 (ATDMA) 5120 kSym/s 64QAM
Upstream OFDM
FFT Type Channel Width(MHz) # of Active Subcarriers First Active Subcarrier(MHz) Last Active Subcarrier(MHz) Tx Power(dBmV)
Status
System Uptime: 0 d: 2 h: 58 m
Computers Detected: staticCPE(1), dynamicCPE(1)
CM Status: Telephony-DHCP
Time and Date: Sat 2021-01-02 14:38:08
Energy Efficient Ethernet
LAN Port 1
LAN Port 2
Front Panel Indicators
Front Panel Indicator Configuration: ⓘ
Always Active
Active on Alerts
Off
Apply
Product Type
Product Type: 01000000 20003132
Hardware Model T25
Hardware Info ARRIS DOCSIS 3.1 / PacketCable 2.0 Touchstone Telephony Modem / Retail
Eth Sw Port 1 ENABLED
Ethernet Phy Type Realtek 1x2-port switch
Router DISABLED
Telemetry DISABLED
Line Card ENABLED
Num Lines 2
RF HW MAXLINEAR
Market North America
Interface Parameters
Link Aggregation ⓘ
Interface Name Provisioned State Speed (Mbps) MAC address
LAN Port 1 Enabled Up 1000 (Full) AC:DB:48
LAN Port 2 Enabled Down ----- AC:DB:48:
CABLE Enabled Up ----- AC:DB:48:
MTA FailOtherReason Down ----- AC:DB:48:
Diplexer
Upstream Range Downstream Range Current Band Setting
Band 0 5 MHz-85 MHz 108 MHz-1002 MHz
Band 1 5 MHz-42 MHz 108 MHz-1002 MHz X
VoIP High Definition Audio
Line LC State CallP State Loop Current HD Status WB SLIC HD Enable HD EndPnt Enable HD Codec Provisioned
1 Out Of Service OOS Boosted Not Provisioned Enabled Enabled Enabled Yes
2 Out Of Service OOS Boosted Not Provisioned Enabled Enabled Enabled Yes
System: ARRIS DOCSIS 3.1 / PacketCable 2.0 Touchstone Telephony Modem / Retail
HW_REV: 2
VENDOR: ARRIS Group, Inc.
BOOTR: 2.2.23.635901
SW_REV: 11.02.057.12.PC20
MODEL: T25
Serial Number: AAU5
Options:
Firmware Build and Revisions
Firmware Name: TS11.02.057.12_092820_711.PC20.03
Firmware Build Time: Mon Sep 28 17:37:14 EDT 2020
CM State:Telephony-DHCP
Docsis-Downstream Scanning Completed
Docsis-Downstream Ranging Completed
Docsis-Upstream Ranging Completed
Docsis-DHCP Completed
Docsis-TFTP Completed
Docsis-Data Reg Complete Completed
Telephony-DHCP Completed
Telephony-TFTP In Progress
Telephony-Reg with Call Server Not Started
Telephony-Reg Complete Not Started
TOD State:
Time of Day Retrieved
BPI State:
BPI Status Enabled, Authorized
DHCP Attempts to obtain CM IP Address:
IPv4 Attempt(s) -----
IPv6 Attempt(s) -----
Date Time Event ID Event Level Description
1/1/2021 21:42 74010100 6 CM-STATUS message sent. Event Type Code: 4; Chan ID: 48; DSID: N/A; MAC Addr: N/A; OFDM/OFDMA Profile ID: N/A.;CM-MAC=ac:db:48:;CMTS-MAC=**:**:**:**:**:**;CM-QOS=1.1;CM-VER=3.1;
1/1/2021 22:07 90000000 5 MIMO Event MIMO: Stored MIMO=-1 post cfg file MIMO=-1;CM-MAC=ac:db:48:;CMTS-MAC=**:**:**:**:**:**;CM-QOS=1.1;CM-VER=3.1;
1/2/2021 10:14 84000500 3 SYNC Timing Synchronization failure - Loss of Sync;CM-MAC=ac:db:48:;CMTS-MAC=**:**:**:**:**:**;CM-QOS=1.1;CM-VER=3.1;
1/2/2021 10:14 74010100 6 CM-STATUS message sent. Event Type Code: 21; Chan ID: 48; DSID: N/A; MAC Addr: N/A; OFDM/OFDMA Profile ID: N/A.;CM-MAC=ac:db:48:;CMTS-MAC=**:**:**:**:**:**;CM-QOS=1.1;CM-VER=3.1;
1/2/2021 10:14 84020200 5 Lost MDD Timeout;CM-MAC=ac:db:48:;CMTS-MAC=**:**:**:**:**:**;CM-QOS=1.1;CM-VER=3.1;
1/2/2021 10:14 74010100 6 CM-STATUS message sent. Event Type Code: 2; Chan ID: 34; DSID: N/A; MAC Addr: N/A; OFDM/OFDMA Profile ID: N/A.;CM-MAC=ac:db:48:;CMTS-MAC=**:**:**:**:**:**;CM-QOS=1.1;CM-VER=3.1;
1/2/2021 10:14 84020200 5 Lost MDD Timeout;CM-MAC=ac:db:48:;CMTS-MAC=**:**:**:**:**:**;CM-QOS=1.1;CM-VER=3.1;
1/2/2021 10:14 74010100 6 CM-STATUS message sent. Event Type Code: 2; Chan ID: 24; DSID: N/A; MAC Addr: N/A; OFDM/OFDMA Profile ID: N/A.;CM-MAC=ac:db:48:;CMTS-MAC=**:**:**:**:**:**;CM-QOS=1.1;CM-VER=3.1;
1/2/2021 10:14 84020200 5 Lost MDD Timeout;CM-MAC=ac:db:48:;CMTS-MAC=**:**:**:**:**:**;CM-QOS=1.1;CM-VER=3.1;
1/2/2021 10:14 74010100 6 CM-STATUS message sent. Event Type Code: 2; Chan ID: 25; DSID: N/A; MAC Addr: N/A; OFDM/OFDMA Profile ID: N/A.;CM-MAC=ac:db:48:;CMTS-MAC=**:**:**:**:**:**;CM-QOS=1.1;CM-VER=3.1;
1/2/2021 10:16 82000400 3 Received Response to Broadcast Maintenance Request, But no Unicast Maintenance opportunities received - T4 time out;CM-MAC=ac:db:48:;CMTS-MAC=**:**:**:**:**:**;CM-QOS=1.1;CM-VER=3.1;
1/2/2021 10:19 84020100 4 Missing Mandatory MDD TLV on primary DS Channel;CM-MAC=ac:db:48:;CMTS-MAC=**:**:**:**:**:**;CM-QOS=1.1;CM-VER=3.1;
1/2/2021 10:20 90000000 5 MIMO Event MIMO: Stored MIMO=-1 post cfg file MIMO=-1;CM-MAC=ac:db:48:;CMTS-MAC=**:**:**:**:**:**;CM-QOS=1.1;CM-VER=3.1;
1/2/2021 10:20 84000700 5 RCS Partial Service;CM-MAC=ac:db:48:;CMTS-MAC=**:**:**:**:**:**;CM-QOS=1.1;CM-VER=3.1;
1/2/2021 10:20 74010100 6 CM-STATUS message sent. Event Type Code: 4; Chan ID: 48; DSID: N/A; MAC Addr: N/A; OFDM/OFDMA Profile ID: N/A.;CM-MAC=ac:db:48:;CMTS-MAC=**:**:**:**:**:**;CM-QOS=1.1;CM-VER=3.1;
1/2/2021 10:21 84020200 5 Lost MDD Timeout;CM-MAC=ac:db:48:;CMTS-MAC=**:**:**:**:**:**;CM-QOS=1.1;CM-VER=3.1;
1/2/2021 10:21 74010100 6 CM-STATUS message sent. Event Type Code: 1; Chan ID: 38; DSID: N/A; MAC Addr: N/A; OFDM/OFDMA Profile ID: N/A.;CM-MAC=ac:db:48:;CMTS-MAC=**:**:**:**:**:**;CM-QOS=1.1;CM-VER=3.1;
1/2/2021 10:21 84020200 5 Lost MDD Timeout;CM-MAC=ac:db:48:;CMTS-MAC=**:**:**:**:**:**;CM-QOS=1.1;CM-VER=3.1;
1/2/2021 10:24 82000400 3 Received Response to Broadcast Maintenance Request, But no Unicast Maintenance opportunities received - T4 time out;CM-MAC=ac:db:48:;CMTS-MAC=**:**:**:**:**:**;CM-QOS=1.1;CM-VER=3.1;
1/2/2021 10:24 74010100 6 CM-STATUS message sent. Event Type Code: 23; Chan ID: 48; DSID: N/A; MAC Addr: N/A; OFDM/OFDMA Profile ID: N/A.;CM-MAC=ac:db:48:;CMTS-MAC=**:**:**:**:**:**;CM-QOS=1.1;CM-VER=3.1;
1/2/2021 10:24 82000400 3 Received Response to Broadcast Maintenance Request, But no Unicast Maintenance opportunities received - T4 time out;CM-MAC=ac:db:48:;CMTS-MAC=**:**:**:**:**:**;CM-QOS=1.1;CM-VER=3.1;
1/2/2021 10:25 74010100 6 CM-STATUS message sent. Event Type Code: 24; Chan ID: 48; DSID: N/A; MAC Addr: N/A; OFDM/OFDMA Profile ID: 3.;CM-MAC=ac:db:48:;CMTS-MAC=**:**:**:**:**:**;CM-QOS=1.1;CM-VER=3.1;
1/2/2021 10:25 90000000 5 MIMO Event MIMO: Stored MIMO=-1 post cfg file MIMO=-1;CM-MAC=ac:db:48:;CMTS-MAC=**:**:**:**:**:**;CM-QOS=1.1;CM-VER=3.1;
1/2/2021 10:25 84000700 5 RCS Partial Service;CM-MAC=ac:db:48:;CMTS-MAC=**:**:**:**:**:**;CM-QOS=1.1;CM-VER=3.1;
1/2/2021 10:26 74010100 6 CM-STATUS message sent. Event Type Code: 5; Chan ID: 48; DSID: N/A; MAC Addr: N/A; OFDM/OFDMA Profile ID: N/A.;CM-MAC=ac:db:48:;CMTS-MAC=**:**:**:**:**:**;CM-QOS=1.1;CM-VER=3.1;
1/2/2021 10:27 84000500 3 SYNC Timing Synchronization failure - Loss of Sync;CM-MAC=ac:db:48:;CMTS-MAC=**:**:**:**:**:**;CM-QOS=1.1;CM-VER=3.1;
1/2/2021 10:27 74010100 6 CM-STATUS message sent. Event Type Code: 2; Chan ID: 33; DSID: N/A; MAC Addr: N/A; OFDM/OFDMA Profile ID: N/A.;CM-MAC=ac:db:48:;CMTS-MAC=**:**:**:**:**:**;CM-QOS=1.1;CM-VER=3.1;
1/2/2021 10:28 84020200 5 Lost MDD Timeout;CM-MAC=ac:db:48:;CMTS-MAC=**:**:**:**:**:**;CM-QOS=1.1;CM-VER=3.1;
1/2/2021 10:30 82000400 3 Received Response to Broadcast Maintenance Request, But no Unicast Maintenance opportunities received - T4 time out;CM-MAC=ac:db:48;CMTS-MAC=**:**:**:**:**:**;CM-QOS=1.1;CM-VER=3.1;
1/2/2021 10:30 74010100 6 CM-STATUS message sent. Event Type Code: 23; Chan ID: 48; DSID: N/A; MAC Addr: N/A; OFDM/OFDMA Profile ID: N/A.;CM-MAC=ac:db:48:;CMTS-MAC=**:**:**:**:**:**;CM-QOS=1.1;CM-VER=3.1;
1/2/2021 10:30 82000200 3 No Ranging Response received - T3 time-out;CM-MAC=ac:db:48:;CMTS-MAC=**:**:**:**:**:**;CM-QOS=1.1;CM-VER=3.1;
1/2/2021 10:30 74010100 6 CM-STATUS message sent. Event Type Code: 24; Chan ID: 48; DSID: N/A; MAC Addr: N/A; OFDM/OFDMA Profile ID: 3.;CM-MAC=ac:db:48:;CMTS-MAC=**:**:**:**:**:**;CM-QOS=1.1;CM-VER=3.1;
1/2/2021 10:30 82000200 3 No Ranging Response received - T3 time-out;CM-MAC=ac:db:48:;CMTS-MAC=**:**:**:**:**:**;CM-QOS=1.1;CM-VER=3.1;
1/2/2021 10:31 90000000 5 MIMO Event MIMO: Stored MIMO=-1 post cfg file MIMO=-1;CM-MAC=ac:db:48:;CMTS-MAC=**:**:**:**:**:**;CM-QOS=1.1;CM-VER=3.1;
1/2/2021 10:31 84000700 5 RCS Partial Service;CM-MAC=ac:db:48:;CMTS-MAC=**:**:**:**:**:**;CM-QOS=1.1;CM-VER=3.1;
1/2/2021 10:31 74010100 6 CM-STATUS message sent. Event Type Code: 4; Chan ID: 48; DSID: N/A; MAC Addr: N/A; OFDM/OFDMA Profile ID: N/A.;CM-MAC=ac:db:48:;CMTS-MAC=**:**:**:**:**:**;CM-QOS=1.1;CM-VER=3.1;
1/2/2021 10:36 84000500 3 SYNC Timing Synchronization failure - Loss of Sync;CM-MAC=ac:db:48:;CMTS-MAC=**:**:**:**:**:**;CM-QOS=1.1;CM-VER=3.1;
1/2/2021 10:36 74010100 6 CM-STATUS message sent. Event Type Code: 2; Chan ID: 39; DSID: N/A; MAC Addr: N/A; OFDM/OFDMA Profile ID: N/A.;CM-MAC=ac:db:48:;CMTS-MAC=**:**:**:**:**:**;CM-QOS=1.1;CM-VER=3.1;
1/2/2021 10:36 84000500 3 SYNC Timing Synchronization failure - Loss of Sync;CM-MAC=ac:db:48:;CMTS-MAC=**:**:**:**:**:**;CM-QOS=1.1;CM-VER=3.1;
1/2/2021 10:36 74010100 6 CM-STATUS message sent. Event Type Code: 16; Chan ID: 48; DSID: N/A; MAC Addr: N/A; OFDM/OFDMA Profile ID: 3.;CM-MAC=ac:db:48:;CMTS-MAC=**:**:**:**:**:**;CM-QOS=1.1;CM-VER=3.1;
1/2/2021 10:36 84020200 5 Lost MDD Timeout;CM-MAC=ac:db:48:;CMTS-MAC=**:**:**:**:**:**;CM-QOS=1.1;CM-VER=3.1;
1/2/2021 10:38 82000400 3 Received Response to Broadcast Maintenance Request, But no Unicast Maintenance opportunities received - T4 time out;CM-MAC=ac:db:48:;CMTS-MAC=**:**:**:**:**:**;CM-QOS=1.1;CM-VER=3.1;
1/2/2021 10:40 84020100 4 Missing Mandatory MDD TLV on primary DS Channel;CM-MAC=ac:db:48:;CMTS-MAC=**:**:**:**:**:**;CM-QOS=1.1;CM-VER=3.1;
1/2/2021 10:40 90000000 5 MIMO Event MIMO: Stored MIMO=-1 post cfg file MIMO=-1;CM-MAC=ac:db:48:;CMTS-MAC=**:**:**:**:**:**;CM-QOS=1.1;CM-VER=3.1;
1/2/2021 10:40 84000700 5 RCS Partial Service;CM-MAC=ac:db:48:;CMTS-MAC=**:**:**:**:**:**;CM-QOS=1.1;CM-VER=3.1;
1/2/2021 10:41 74010100 6 CM-STATUS message sent. Event Type Code: 4; Chan ID: 48; DSID: N/A; MAC Addr: N/A; OFDM/OFDMA Profile ID: N/A.;CM-MAC=ac:db:48:;CMTS-MAC=**:**:**:**:**:**;CM-QOS=1.1;CM-VER=3.1;
12/31/1969 17:01 82000200 3 No Ranging Response received - T3 time-out;CM-MAC=ac:db:48;CMTS-MAC=**:**:**:**:**:**;CM-QOS=1.1;CM-VER=3.1;
1/2/2021 11:31 90000000 5 MIMO Event MIMO: Stored MIMO=-1 post cfg file MIMO=-1;CM-MAC=ac:db:48:;CMTS-MAC=**:**:**:**:**:**;CM-QOS=1.1;CM-VER=3.1;
12/31/1969 17:01 82000200 3 No Ranging Response received - T3 time-out;CM-MAC=ac:db:48:;CMTS-MAC=**:**:**:**:**:**;CM-QOS=1.1;CM-VER=3.1;
1/2/2021 11:41 90000000 5 MIMO Event MIMO: Stored MIMO=-1 post cfg file MIMO=-1;CM-MAC=ac:db:48:;CMTS-MAC=**:**:**:**:**:**;CM-QOS=1.1;CM-VER=3.1;
PacketCable(MTA) Events
Date Time Event ID Description
12/31/2020 17:50 25 MTA PROV: Failed
12/31/2020 22:04 3000000002 MTA RESET:
12/31/2020 22:07 25 MTA PROV: Failed
1/1/2021 20:03 3000000004 DOCSIS-CONN-ERROR
1/1/2021 20:03 3000000002 MTA RESET:
1/1/2021 20:06 25 MTA PROV: Failed
1/1/2021 20:14 25 MTA PROV: Failed
1/1/2021 21:39 3000000002 MTA RESET:
1/1/2021 21:42 25 MTA PROV: Failed
1/1/2021 22:07 25 MTA PROV: Failed
1/2/2021 10:17 3000000004 DOCSIS-CONN-ERROR
1/2/2021 10:17 3000000002 MTA RESET:
1/2/2021 10:20 25 MTA PROV: Failed
1/2/2021 10:25 3000000004 DOCSIS-CONN-ERROR
1/2/2021 10:25 3000000002 MTA RESET:
1/2/2021 10:26 25 MTA PROV: Failed
1/2/2021 10:30 3000000004 DOCSIS-CONN-ERROR
1/2/2021 10:30 3000000002 MTA RESET:
1/2/2021 10:31 25 MTA PROV: Failed
1/2/2021 10:38 3000000004 DOCSIS-CONN-ERROR
1/2/2021 10:38 3000000002 MTA RESET:
1/2/2021 10:41 25 MTA PROV: Failed
1/2/2021 11:32 25 MTA PROV: Failed
1/2/2021 11:42 25 MTA PROV: Failed
No Responses!