Wipster
26-07-2010, 14:27
Hi all,
Recently I have been having troubles with my service, I had a look at the modem stats and it seems the upstream doesn't lock when I am having troubles.
Clicking refresh on the upstream stats seems to show the power fluctuating wildly and it changing modulation but it still unable to obtain a lock. The power seems to max out at 61dBmV which I hear is way to high but generally bounced around the high 40's-50's.
I had an engineer come out and he fitted a 6dB forward path attenuator on the line, but I was thinking to myself hang on thats going to be reducing my incoming signal isn't it? Its the transmit I'm having troubles with... but after a few beers and being unsure in this subject I gave him the benefit of the doubt.
Now being an electronic engineer but with no experience in cable can someone correct me if my thinking is wrong.
Downstream signal is sent from the cabinet and adjusted there to be within spec when it gets to the building, some tweaks may be necessary hence attenuators.
Upstream signal is sent from my modem and is the power that is needed for it to lock, a high value means it needed allot of juice so there is possibly a cable fault or modem dying or something. Attaching an attenuator for an upstream fault is pointless as it would mean the modem has to send even more to lock.
Recently I have been having troubles with my service, I had a look at the modem stats and it seems the upstream doesn't lock when I am having troubles.
Clicking refresh on the upstream stats seems to show the power fluctuating wildly and it changing modulation but it still unable to obtain a lock. The power seems to max out at 61dBmV which I hear is way to high but generally bounced around the high 40's-50's.
I had an engineer come out and he fitted a 6dB forward path attenuator on the line, but I was thinking to myself hang on thats going to be reducing my incoming signal isn't it? Its the transmit I'm having troubles with... but after a few beers and being unsure in this subject I gave him the benefit of the doubt.
Now being an electronic engineer but with no experience in cable can someone correct me if my thinking is wrong.
Downstream signal is sent from the cabinet and adjusted there to be within spec when it gets to the building, some tweaks may be necessary hence attenuators.
Upstream signal is sent from my modem and is the power that is needed for it to lock, a high value means it needed allot of juice so there is possibly a cable fault or modem dying or something. Attaching an attenuator for an upstream fault is pointless as it would mean the modem has to send even more to lock.