Digiteeruk
30-07-2006, 02:21
Hi, I have an NTL 250 Cable Modem that has no attenuator and is fed from a 2 way splitter that also feeds a pace STB (STB only - no UHF to TV).
I did a levels check on the modem - from reading the forum's excellent guide, although Upstream tx power seems just borderline at 55 dBmV, the Downstream Rx at -16 dBmV and SNR at 29+ dB appears very worrying:
Downstream Frequency : 586750000 Hz
Downstream Modulation : QAM64
Downstream Symbol Rate : 6952 Ksym/sec
Downstream Interleave Depth : taps12Increment17
Downstream Receive Power Level : -16.3 dBmV
Downstream SNR : 29.7 dB
Upstream Frequency : 28784000 Hz
Upstream Modulation : QPSK
Upstream Symbol Rate : 2560 Ksym/sec
Upstream transmit Power Level : 55.0 dBmV
(Have checked all connections are good / tight).
I upgraded from my original 1M to the 10M BB service, but as it rarely gave me a d/l bandwidth more than 3 - 4M, have just downgraded to the 4M service and am seeing 3.5 - 3.9M.
The problem is that the BB service actually seems very reliable / stable but I am very worried that my modem is running flat out!
In the spitit of 'If it ain't broke, don't fix it' should I call the problem in and request a power upgrade? If so, how would you recommend wording the request to get past the other-continent helpdesk, and 'pre-emptive maintanance' would probably not justify a visit for our local overworked techs (Portsmouth area).
All advice gratefully receievd - many thanks in advance
Dig.
I did a levels check on the modem - from reading the forum's excellent guide, although Upstream tx power seems just borderline at 55 dBmV, the Downstream Rx at -16 dBmV and SNR at 29+ dB appears very worrying:
Downstream Frequency : 586750000 Hz
Downstream Modulation : QAM64
Downstream Symbol Rate : 6952 Ksym/sec
Downstream Interleave Depth : taps12Increment17
Downstream Receive Power Level : -16.3 dBmV
Downstream SNR : 29.7 dB
Upstream Frequency : 28784000 Hz
Upstream Modulation : QPSK
Upstream Symbol Rate : 2560 Ksym/sec
Upstream transmit Power Level : 55.0 dBmV
(Have checked all connections are good / tight).
I upgraded from my original 1M to the 10M BB service, but as it rarely gave me a d/l bandwidth more than 3 - 4M, have just downgraded to the 4M service and am seeing 3.5 - 3.9M.
The problem is that the BB service actually seems very reliable / stable but I am very worried that my modem is running flat out!
In the spitit of 'If it ain't broke, don't fix it' should I call the problem in and request a power upgrade? If so, how would you recommend wording the request to get past the other-continent helpdesk, and 'pre-emptive maintanance' would probably not justify a visit for our local overworked techs (Portsmouth area).
All advice gratefully receievd - many thanks in advance
Dig.