Haxorware Forums

Is there an thing I can do to prevent the modem for changing downstream channel? Several times in a day and sometime it will just rng-rsp untill it locks onto a channel.

Here is what I get from serial output:
===> Entry already exists.
Scanning DS Channel at 747000000 Hz...
Found carrier at 747000000 Hz!
Signal quality = 29.6 dB SNR

RNG-RSP Adj: tim=-11 power=20 freq=0 Stat=Continue
5.1.2 to agent
===> Entry already exists.
Scanning DS Channel at 717000000 Hz...
dB SNR
t=Continue
xists.
Scanning DS Channel at 735000000 Hz...
Found carrier at 735000000 Hz!
Signal quality = 29.7 dB SNR
ue

RNG-RSP Adj: tim=0 power=19 freq=0 Stat=Success
Enabling network access for all CPE ports.
BcmCmDocsisStatusEventCodes::kCmIsOperational
BcmCmDocsisStatusEventCodes::kCmIsOperational
VendorCtrl: HFC up
===> WARNING: Failed to register TabularMibBridge 1.3.6.1.2.1.85.1.2 to agent
===> Entry already exists.
===> WARNING: Failed to register TabularMibBridge 1.3.6.1.2.1.85.1.2 to agent
===> Entry already exists.
===> WARNING: Failed to register TabularMibBridge 1.3.6.1.2.1.85.1.2 to agent
===> Entry already exists.
===> WARNING: Failed to register TabularMibBridge 1.3.6.1.2.1.85.1.2 to agent
===> Entry already exists.
Found carrier at 723000000 Hz!
Signal quality = 28.9 dB SNR
=Success
Enabling network access for all CPE ports.
BcmCmDocsisStatusEventCodes::kCmIsOperational
BcmCmDocsisStatusEventCodes::kCmIsOperational
VendorCtrl: HFC up
===> WARNING: Failed to register TabularMibBridge 1.3.6.1.2.1.85.1.2 to agent
===> Entry already exists.
===> WARNING: Failed to register TabularMibBridge 1.3.6.1.2.1.85.1.2 to agent
===> Entry already exists.
===> WARNING: Failed to register TabularMibBridge 1.3.6.1.2.1.85.1.2 to agent
===> Entry already exists.
===> WARNING: Failed to register TabularMibBridge 1.3.6.1.2.1.85.1.2 to agent
===> Entry already exists.

This is from modem log:

2012-11-09 13:03:31 critical DHCP FAILED - Discover sent, no offer received
2012-11-09 13:00:14 critical No Ranging Response received - T3 time-out
2012-11-09 13:00:07 critical DHCP FAILED - Discover sent, no offer received
2012-11-09 12:56:45 critical No Ranging Response received - T3 time-out
2012-11-09 12:56:41 critical SYNC Timing Synchronization failure - Failed to acquire FEC framing
2012-11-09 12:56:36 critical SYNC Timing Synchronization failure - Failed to acquire QAM/QPSK symbol timing
2012-11-09 12:56:24 critical No UCD's Received - Timeout
2012-11-09 12:56:12 critical No UCD's Received - Timeout
2012-11-09 12:55:15 critical DHCP FAILED - Discover sent, no offer received
2012-11-09 12:51:56 critical No Ranging Response received - T3 time-out
2012-11-09 12:51:50 critical DHCP FAILED - Discover sent, no offer received
2012-11-09 12:48:35 critical No Ranging Response received - T3 time-out
2012-11-09 12:48:30 critical DHCP FAILED - Discover sent, no offer received
2012-11-09 12:45:15 critical No Ranging Response received - T3 time-out
2012-11-09 12:45:12 critical Init RANGING Critical Ranging Request Retries exhausted
2012-11-09 12:45:12 critical No Ranging Response received - T3 time-out
2012-11-09 12:41:15 critical No UCD's Received - Timeout
2012-11-09 12:38:09 critical DHCP FAILED - Discover sent, no offer received
2012-11-09 12:34:53 critical No Ranging Response received - T3 time-out
2012-11-09 12:34:50 critical Init RANGING Critical Ranging Request Retries exhausted
2012-11-09 12:34:50 critical No Ranging Response received - T3 time-out
2012-11-09 12:31:47 critical DHCP FAILED - Discover sent, no offer received
2012-11-09 12:28:31 critical No Ranging Response received - T3 time-out

fix your rf issues 1st

Are you referring to cable connection into the modem?

Quote:Found carrier at 723000000 Hz!
Signal quality = 28.9 dB SNR
=Success

min SNR is 30 Db> or greater

thus the channel change

I guess all the splitters before the cable modem doesn't help. Let me relocate the modem before the splitters to see if it helps.

Got it to 31.6dB. Hopefully this will prevent it from changing DS channel.

Symbol Rate 5360.537 Ksym/sec
Downstream Power -7.9 dBmV
SNR 31.6 dB