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Network ping spikes - Upstream Power Level (dBmV) too low according to Arris SBG8300 spec sheet
I am experiencing network ping spikes even when directly connected to modem. Arris spec sheet says I am under the specified range for Upstream Power Level. Not sure what to do.
Acceptable Signal Levels
| Acceptable Downstream Power Level | |||
| -15 dBmV to + 15 dBmV | |||
| Downstream Signal to Noise Ratio (SNR) | |||
| Modulation | Downstream Power | Acceptable Downstream SNR | |
| QAM64 | n/a | +23.5 dB or greater | |
| QAM256 | -6 dBmV to +15 dBmV | +30 dB or greater | |
| -15 dBmV to -6 dBmV | +33 dB or greater | ||
| Upstream Transmit Power Level | |||
| Index | Symbol Rate | Acceptable Upstream Power Levels | |
| Single (1) | 1280 Kysm/sec | 45 dBmV to 61 dBmV | |
| 2560 Kysm/sec | 45 dBmV to 58 dBmV | ||
| 5120 Kysm/sec | 45 dBmV to 57 dBmV | ||
| Two (2) | 1280 Kysm/sec | 45 dBmV to 58 dBmV | |
| 2560 Kysm/sec | 45 dBmV to 55 dBmV | ||
| 5120 Kysm/sec | 45 dBmV to 54 dBmV | ||
| Three or more (>=3) | 1280 Kysm/sec | 45 dBmV to 55 dBmV | |
| 2560 Kysm/sec | 45 dBmV to 52 dBmV | ||
| 5120Kysm/sec | 45 dBmV to 51 dBmV | ||
Snapshot of my cable signal:
XfinityRaul
Official Employee
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2.4K Messages
9 hours ago
@user_m0a8n9 Thank you for making us aware of this ping spike issue you're experiencing via Forums. I would be more than happy to help figure out a solution with you. So that we don't go over something you've already done, can you please share with me what troubleshooting steps have you completed on your own? Have you by any chance used the Xfinity app to reset the modem? How about a power cycle, have you tried that?
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