Since moving into my home, I’ve had my cable modem in our office. A room above our garage that has coax run to it from the garage, which is where the CATV coax enters the house. Coax enters the house through a wall, goes into a splitter, and heads from there up to our office. Total run length from the splitter is about 30ft. With the modem in the office, and then in the garage, the data for the modem follows (Update 5/26/11: After a couple days, the signal levels changed a bit in its new location. I’ve found online that 6 dBmV is actually a bit on the high side for signal strength, but within acceptable limits):
| Office | Garage | Garage 2 | |
|---|---|---|---|
| Downstream Freq | 567.00 mhz | 567.00 mhz | 579.00 mhz |
| Downstream Power | 3 dBmV | 4 dBmV | 6 dBmV |
| Downstream SNR | 36 dB | 36 dB | 35 dB |
| Modulation | QAM256 | QAM256 | QAM256 |
| Upstream Freq | 32.400 mhz | 32.400 mhz | 22.800 |
| Upstream Power | 44 dBmV | 43 dBmV | 42 dBmV |
| Channel Type | DOCSIS 2.0 (ATDMA) | DOCSIS 2.0 (ATDMA) | DOCSIS 2.0 (ATDMA) |
| Symbol Rate | 5120 kSym/sec | 5120 kSym/sec | 5120 kSym/sec |
| Modulation | QAM64 | QAM64 | QAM64 |