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ccarmock · 04-09-2011, 18:27

During the past few days I have experienced poor performance. I have the Business 10 Mb/s service with Fixed IP address. I am in an ex-Telewest area that is (hopefully!) about to get some major refurbishment to provide for the improved upstream bandwidth and 100 Mb/s

I am in Merton, but fed from New Malden.

My modem (EPC2100R2) stats are:-

Downstream Status Operational
Channel ID 7
Downstream Frequency 339000000 Hz
Modulation 256QAM
Bit Rate 10241000 bits/sec
Power Level 2.4 dBmV
Signal to Noise Ratio 40.8 dB

Upstream Status Operational
Channel ID 4
Upstream Frequency 29200000 Hz
Modulation QPSK
Symbol Rate 769000 bits/sec
Power Level 43.5 dBmV

Having read other posts it would appear that QPSK is a problem. However for the 4 years I have had this service I have always been on QPSK.

I have a 15 dB forward path attenuator on the back of the modem as I am directly across the street from the green cabinet, and even on the lowest tap the power levels were too high.

I don't have any T3 errors etc in the event log, nor do I get disconnects.

Is it possible that in this area that 16QAM upstreams are not provided at the moment and that after the upgrade work this will change?

Or should 16QAM be operational here now and I have a fault?

04-09-2011, 18:27	#1
ccarmock Inactive Join Date: Jun 2008 Posts: 804	Poor upstream performance During the past few days I have experienced poor performance. I have the Business 10 Mb/s service with Fixed IP address. I am in an ex-Telewest area that is (hopefully!) about to get some major refurbishment to provide for the improved upstream bandwidth and 100 Mb/s I am in Merton, but fed from New Malden. My modem (EPC2100R2) stats are:- Downstream Status Operational Channel ID 7 Downstream Frequency 339000000 Hz Modulation 256QAM Bit Rate 10241000 bits/sec Power Level 2.4 dBmV Signal to Noise Ratio 40.8 dB Upstream Status Operational Channel ID 4 Upstream Frequency 29200000 Hz Modulation QPSK Symbol Rate 769000 bits/sec Power Level 43.5 dBmV Having read other posts it would appear that QPSK is a problem. However for the 4 years I have had this service I have always been on QPSK. I have a 15 dB forward path attenuator on the back of the modem as I am directly across the street from the green cabinet, and even on the lowest tap the power levels were too high. I don't have any T3 errors etc in the event log, nor do I get disconnects. Is it possible that in this area that 16QAM upstreams are not provided at the moment and that after the upgrade work this will change? Or should 16QAM be operational here now and I have a fault?