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SWATMEDIC

Got new replacement modem now my snr and speeds sux HELLLP

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lightning reecently fried my modem so comcast brought me a replacement sb5120 but now my snr is a steday 31 where as it was 34-33 any ideas also here a copy of my log======

Frequency  627000000 Hz

Signal to Noise Ratio 31 dB

QAM 256

Network Access Control Object ON

Power Level -4 dBmV 

The Downstream Power Level reading is a snapshot taken at the time this page was requested. Please Reload/Refresh this Page for a new reading

Upstream Value

Channel ID 4

Frequency 30992000 Hz

Ranging Service ID 1863

Symbol Rate 3.200 Msym/s

Power Level 47 dBmV

700101000016 5-Warning D03.0 DHCP WARNING - Non-critical field invalid in response

050625104204 3-Critical R02.0 No Ranging Response received - T3 time-out

050625094120 3-Critical T01.0 SYNC Timing Synchronization failure - Failed to acquire QAM/QPSK symbol tim

050625094120 3-Critical R04.0 Received Response to Broadcast Maintenance Request, but no Unicast Maintena

050625024038 3-Critical R02.0 No Ranging Response received - T3 time-out

700101000017 3-Critical T04.0 SYNC Timing Synchronization failure - Failed to receive MAC SYNC frame with

700101000007 3-Critical T01.0 SYNC Timing Synchronization failure - Failed to acquire QAM/QPSK symbol tim

700101000006 3-Critical T04.0 SYNC Timing Synchronization failure - Failed to receive MAC SYNC frame with

700101000027 3-Critical R02.0 No Ranging Response received - T3 time-out

700101000017 3-Critical T04.0 SYNC Timing Synchronization failure - Failed to receive MAC SYNC frame with

700101000007 3-Critical T01.0 SYNC Timing Synchronization failure - Failed to acquire QAM/QPSK symbol tim

700101000006 3-Critical T04.0 SYNC Timing Synchronization failure - Failed to receive MAC SYNC frame w

thanks for any help

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31dB is on the low side for downstream SNR, generally you want >32dB signal to noise in 256QAM.

That level usually won't cause an issue, and it is an RF issue, not much you can do about it as the end user.

Is it unGodly hot where you are like it is where I am?

RF levels drop off when it is warm outside, so that may be why you are seeing a lower SNR today.

-(lower signal level generally means a lower SNR- ie- lower inputs at the actives)-

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050625104204 3-Critical R02.0 No Ranging Response received - T3 time-out

050625094120 3-Critical T01.0 SYNC Timing Synchronization failure - Failed to acquire QAM/QPSK symbol tim

050625094120 3-Critical R04.0 Received Response to Broadcast Maintenance Request, but no Unicast Maintena

050625024038 3-Critical R02.0 No Ranging Response received - T3 time-out

thanks for any help

I'm no pro with cable modems, but your levels don't look to bad. My levels are close to yours. Did your ISP "authorize" your modem for their network yet?

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over a maximum of 30 hops:

1    3 ms    2 ms    2 ms  192.168.2.1

2    12 ms    10 ms    10 ms  10.68.152.1

3    10 ms    10 ms    11 ms  68.87.163.193

4    13 ms    11 ms    12 ms  12.124.58.153

5    30 ms    29 ms    30 ms  gbr6-p80.attga.ip.att.net [12.123.21.78]

6    28 ms    30 ms    30 ms  tbr1-cl1.dlstx.ip.att.net [12.122.2.89]

7    28 ms    28 ms    29 ms  gar1-p360.dlrtx.ip.att.net [12.123.196.101]

8    29 ms    28 ms    30 ms  12.119.136.14

9    28 ms    29 ms    28 ms  dist-vlan31.dsr3-2.dllstx3.theplanet.com [70.85.127.30]

10    29 ms    29 ms    30 ms  dist-vlan41.dsr2-1.dllstx4.theplanet.com [70.85.127.83]

11    28 ms    28 ms    28 ms  gig1-0-1.tp-car9-1.dllstx4.theplanet.com [67.18.116.69]

12    27 ms    35 ms    27 ms  85.67-18-179.reverse.theplanet.com [67.18.179.85]

Trace complete.

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i think the speeds are 4000/386.And the snr changed when they replaced my modem ,it seems the same model should get the same snr?RITE?,,on side note u play socom2 online???

It makes sense that it should be the same, but who knows.  There is a range of like 10 or 15 dB that is acceptable, so I guess it varies.  Side note: lol! no I used to play but haven't for like almost a year.  I gave my PS2 to my younger brothers.  Thanks tho!

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