Cable Forum - View Single Post - Connection dropping, but modem lights remain healthy.

Gar · 31-05-2011, 21:01

Sadly no luck with the attenuator. The connection was okay for a while and then decided to play it's old tricks. Experiment failed.

I meant to do this yesterday (Sorry, Sephiroth!), but here are my modem stats, in full:

Cable Modem Information
Cable Modem : DOCSIS 1.0/1.1/2.0 Compliant
MAC Address : ***
Serial Number : ***
Boot Code Version : 3.1.6d
Software Version : 2.94.1015
Hardware Version : 1.19

Cable Modem Status
Item Status Comments
Acquire a Downstream Channel 402750000 Hz Locked
Connectivity State OK Operational
Boot State OK Operational

Cable Modem Downstream
Downstream Lock : Locked
Downstream Channel Id : 7
Downstream Frequency : 402750000 Hz
Downstream Modulation : QAM256
Downstream Symbol Rate : 5360.537 Ksym/sec
Downstream Interleave Depth : taps32Increment4
Downstream Receive Power Level : 7.7 dBmV
Downstream SNR : 41.8 dB

Cable Modem Upstream
Upstream Lock : Locked
Upstream Channel ID : 2
Upstream Frequency : 25800000 Hz
Upstream Modulation : QPSK
Upstream Symbol Rate : 2560 Ksym/sec
Upstream transmit Power Level : 44.5 dBmV
Upstream Mini-Slot Size : 2

Cable Modem Upstream Burst
Req Init Maint Per Maint Short Data Long Data
(1)(3)(4)(5)(6)
Modulation Type QPSK QPSK QPSK QPSK QPSK
Differential Encoding Off Off Off Off Off
Preamble Length 64 128 128 100 80
Preamble Value Offset 396 6 6 396 396
FEC Error Correction (T) 0 5 5 3 9
FEC Codeword Information Bytes (k) 16 34 34 78 232
Scrambler Seed 338 338 338 338 338
Maximum Burst Size 0 0 0 35 254
Guard Time Size 8 48 48 25 134
Last Codeword Length Fixed Fixed Fixed Short Short
Scrambler on/off On On On On On

Cable Modem Operation Configuration
Network Access : Allowed
Maximum Downstream Data Rate : 10240000
Maximum Upstream Data Rate : 1072000
Maximum Upstream Channel Burst : 8160
Maximum Number of CPEs : 1
Modem Capability : Concatenation Enabled, Fragametation Enabled, PHS Enabled

Event logs (wouldn't allow me to clipboard copy, so they are a bit messy):

Spoiler:

Trace route to BBC website:

Spoiler:

Make of those results what you will, because I'm clueless. Any insight would be greatly appreciated. Thanks.

31-05-2011, 21:01	#27
Gar Inactive Join Date: Nov 2005 Posts: 34	Re: Connection dropping, but modem lights remain healthy. Sadly no luck with the attenuator. The connection was okay for a while and then decided to play it's old tricks. Experiment failed. I meant to do this yesterday (Sorry, Sephiroth!), but here are my modem stats, in full: Cable Modem Information Cable Modem : DOCSIS 1.0/1.1/2.0 Compliant MAC Address : * Serial Number : * Boot Code Version : 3.1.6d Software Version : 2.94.1015 Hardware Version : 1.19 Cable Modem Status Item Status Comments Acquire a Downstream Channel 402750000 Hz Locked Connectivity State OK Operational Boot State OK Operational Cable Modem Downstream Downstream Lock : Locked Downstream Channel Id : 7 Downstream Frequency : 402750000 Hz Downstream Modulation : QAM256 Downstream Symbol Rate : 5360.537 Ksym/sec Downstream Interleave Depth : taps32Increment4 Downstream Receive Power Level : 7.7 dBmV Downstream SNR : 41.8 dB Cable Modem Upstream Upstream Lock : Locked Upstream Channel ID : 2 Upstream Frequency : 25800000 Hz Upstream Modulation : QPSK Upstream Symbol Rate : 2560 Ksym/sec Upstream transmit Power Level : 44.5 dBmV Upstream Mini-Slot Size : 2 Cable Modem Upstream Burst Req Init Maint Per Maint Short Data Long Data (1)(3)(4)(5)(6) Modulation Type QPSK QPSK QPSK QPSK QPSK Differential Encoding Off Off Off Off Off Preamble Length 64 128 128 100 80 Preamble Value Offset 396 6 6 396 396 FEC Error Correction (T) 0 5 5 3 9 FEC Codeword Information Bytes (k) 16 34 34 78 232 Scrambler Seed 338 338 338 338 338 Maximum Burst Size 0 0 0 35 254 Guard Time Size 8 48 48 25 134 Last Codeword Length Fixed Fixed Fixed Short Short Scrambler on/off On On On On On Cable Modem Operation Configuration Network Access : Allowed Maximum Downstream Data Rate : 10240000 Maximum Upstream Data Rate : 1072000 Maximum Upstream Channel Burst : 8160 Maximum Number of CPEs : 1 Modem Capability : Concatenation Enabled, Fragametation Enabled, PHS Enabled Event logs (wouldn't allow me to clipboard copy, so they are a bit messy): Spoiler: Tue May 31 20:21:54 2011 Tue May 31 20:21:54 2011 Information (7) The s/w filename specified in the config file is the same as ... Tue May 31 20:21:54 2011 Tue May 31 20:21:54 2011 Information (7) A software upgrade filename was specified in the config file. Tue May 31 20:21:54 2011 Tue May 31 20:21:54 2011 Information (7) Authorized Tue May 31 20:21:54 2011 Tue May 31 20:21:54 2011 Information (7) Registration complete! Tue May 31 20:21:54 2011 Tue May 31 20:21:54 2011 Information (7) We registered with a DOCSIS 1.1 config file! Tue May 31 20:21:54 2011 Tue May 31 20:21:54 2011 Information (7) Received a REG-RSP message from the CMTS... Tue May 31 20:21:54 2011 Tue May 31 20:21:54 2011 Information (7) Sending a REG-REQ to the CMTS... Tue May 31 20:21:54 2011 Tue May 31 20:21:54 2011 Information (7) CableModem SNMP configure complete Tue May 31 20:21:53 2011 Tue May 31 20:21:53 2011 Information (7) IP init completed ok Tue May 31 20:21:53 2011 Tue May 31 20:21:53 2011 Information (7) CableModem TFTP init ok Time Not Established Time Not Established Information (7) CableModem DHCP client init ok Time Not Established Time Not Established Critical (3) DHCP WARNING - Non-critical field invalid in response. Time Not Established Time Not Established Critical (3) Started Unicast Maintenance Ranging - No Response received - ... Time Not Established Time Not Established Information (7) MAP w/initial maintenance region received Time Not Established Time Not Established Information (7) Downstream sync ok Time Not Established Time Not Established Information (7) MAP w/initial maintenance region received Time Not Established Time Not Established Information (7) Beginning initial ranging... Time Not Established Time Not Established Information (7) downstream time sync acquired... Time Not Established Time Not Established Information (7) Downstream sync ok Time Not Established Time Not Established Information (7) starting ds time sync acquisition... Time Not Established Time Not Established Information (7) Locked on the downstream. Waiting for UCDs... Time Not Established Time Not Established Information (7) Downstream lock ok Time Not Established Time Not Established Information (7) Sync Start Time Not Established Time Not Established Critical (3) DHCP WARNING - Non-critical field invalid in response. Time Not Established Time Not Established Critical (3) DHCP WARNING - Non-critical field invalid in response. Time Not Established Time Not Established Critical (3) No Ranging Response received - T3 time-out Time Not Established Time Not Established Critical (3) No Ranging Response received - T3 time-out Time Not Established Time Not Established Critical (3) No Ranging Response received - T3 time-out Time Not Established Time Not Established Critical (3) No Ranging Response received - T3 time-out Trace route to BBC website: Spoiler: Tracing route to www.bbc.net.uk [212.58.246.91] over a maximum of 30 hops: 1 <1 ms <1 ms <1 ms 192.168.1.1 2 39 ms 8 ms 7 ms 10.217.188.1 3 8 ms 18 ms 8 ms swan-core-1b-ge-300-3842.network.virginmedia.net [80.0.254.141] 4 14 ms 12 ms 24 ms winn-bb-1b-ge-320-0.network.virginmedia.net [212 .43.162.109] 5 29 ms 14 ms 10 ms winn-bb-1a-ae0-0.network.virginmedia.net [213.10 5.172.161] 6 24 ms 13 ms 16 ms glfd-bb-1b-so-100-0.network.virginmedia.net [213 .105.172.130] 7 42 ms 25 ms 16 ms glfd-tmr-1-ae5-0.network.virginmedia.net [213.10 5.159.46] 8 26 ms 47 ms 15 ms redb-ic-1-as0-0.network.virginmedia.net [62.253. 185.78] 9 14 ms 13 ms 25 ms 212.58.239.249 10 19 ms 34 ms 18 ms 212.58.238.149 11 26 ms 39 ms 36 ms te12-1.hsw1.cwwtf.bbc.co.uk [212.58.239.234] 12 19 ms 24 ms 31 ms 212.58.255.12 13 39 ms 53 ms 42 ms bbc-vip012.cwwtf.bbc.co.uk [212.58.246.91] Trace complete. Make of those results what you will, because I'm clueless. Any insight would be greatly appreciated. Thanks.