The subject says it all. We just moved in and got hooked up with the RCN-provided Arris CM620. All good, 25 down / 4.5 up. I bought a Surfboard SB6121 and hooked it up, and speed dropped to 7 down / 1 up. I thought maybe the fact the SB6121 has only 4 download channels might be the problem, so I swapped it out for a SB6141 which has 8 download channels. Same speed results: 7 down / 1 up. Tested via wi-fi (which is where the 25/4.5 results came from) as well as direct ethernet connection to the modem.
Suggestions?
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