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SBG6580 connection dropping. Low upstream power?

R
The Many
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 My SBG6580 modem starts fine, establishes a connection, and appears to work normally. But will drop after a while and, and attempt reconnect. This happens between several times an hour, and a day+

(edit: CM-MAC information removed)

Time Not Established Notice (6) Honoring MDD; IP provisioning mode = IPv6
Time Not Established Notice (6) WiFi Interface [wl0] set to Channel 11 (Side-Band Channel:N/A) - Reason:INIT
Time Not Established Critical (3) SYNC Timing Synchronization failure - Failed to acquire QAM/QPSK symbol timing;;CM-MAC=**:**:**:**:**:**;CMTS-MAC=00:00:00:00:00:00;CM-QOS=1.0;CM-VER=3.0;
 

 

Best answer by SURFboard Moderator

Hello Ranolden,

It looks like an intermittent connection, looking at the cable signal levels the downstream Power levels lowest  6.4 and highest 6.9 dbmv which is on acceptable range (+15/-15 dbmv ) and SNR lowest 38.2 and highest 38.6 db which is in acceptable range (+33 db) , but looking at upstream channels  the power levels should be 45+ to 52+ dbmv but it is only lowest 33.3 and highest 35.5 dbmv which is very low and not in acceptable range . 

Do contact your ISP and try increasing the values to 45+ to 52+ dbmv. 

After increasing the Upstream values , lets change the WiFi channels : follow the link below:

http://arris.force.com/consumers/articles/General_FAQs/SBG6580-v8-5-x-Changing-the-Wireless-Channel

Do let us know if this helps.

 

 

 

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2 replies

S
Wi-Fi Warriors
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Hello Ranolden,

It looks like an intermittent connection, looking at the cable signal levels the downstream Power levels lowest  6.4 and highest 6.9 dbmv which is on acceptable range (+15/-15 dbmv ) and SNR lowest 38.2 and highest 38.6 db which is in acceptable range (+33 db) , but looking at upstream channels  the power levels should be 45+ to 52+ dbmv but it is only lowest 33.3 and highest 35.5 dbmv which is very low and not in acceptable range . 

Do contact your ISP and try increasing the values to 45+ to 52+ dbmv. 

After increasing the Upstream values , lets change the WiFi channels : follow the link below:

http://arris.force.com/consumers/articles/General_FAQs/SBG6580-v8-5-x-Changing-the-Wireless-Channel

Do let us know if this helps.

 

 

 

SURFboard Community Moderator Team
R
The Many
Forum|alt.badge.img
  • RanoldenThe Many
  • Author
  • The Many
  • 1 reply
  • July 1, 2023
SURFboard Moderator wrote:

Hello Ranolden,

It looks like an intermittent connection, looking at the cable signal levels the downstream Power levels lowest  6.4 and highest 6.9 dbmv which is on acceptable range (+15/-15 dbmv ) and SNR lowest 38.2 and highest 38.6 db which is in acceptable range (+33 db) , but looking at upstream channels  the power levels should be 45+ to 52+ dbmv but it is only lowest 33.3 and highest 35.5 dbmv which is very low and not in acceptable range . 

Do contact your ISP and try increasing the values to 45+ to 52+ dbmv. 

After increasing the Upstream values , lets change the WiFi channels : follow the link below:

http://arris.force.com/consumers/articles/General_FAQs/SBG6580-v8-5-x-Changing-the-Wireless-Channel

Do let us know if this helps.

 

 

 

Is this something they can change remotely? They are saying I need to schedule a technician to come out here

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