Jim Wilkins wrote:
"Michael A Terrell" wrote in message
...
rangerssuck wrote:
On Wednesday, November 8, 2017 at 12:28:33 PM UTC-5, Larry Jaques
wrote:

[big snip]

Just curious: do you continue to get TV and internet when the
regional
power is down for days/weeks?

I have determined that my cable system (Spectrum, formerly Time
Warner) stays up for five hours after an outage. That's a
disappointingly short time.



Do you have any idea how much power it takes to run a CATV
distribution system? Those pole mounted power transformers are a
60V, 30A modified square wave from a Constant Voltage Transformer.

That is 1800 VA, continuous, and typically powers about a half
mile of CATV system. How much do you want to be added to your bill,
to extend that three hour design?

It takes that much power to deliver 0dBmV to each house?


Simple, 12 ch one way analog systems are extinct. Today they carry
digital TV, and internet. Both are bidirectional. They also monitor
system status with the return channels. A weak, or missing sgnal at an
EOL testpoint will ntify the headend faster than a customer can find the
right phone number, and has more useful data.

Here is a quick shot of the levels Involved in my DOCIS 3.0 modem. I
don't have a modern FSM for the QAM256 bit video used for digital TV

Downstream Bonding Channel Value
Channel ID 17 18 19 20 21 22 23 24
Frequency 681000000 Hz 687000000 Hz 693000000 Hz 699000000 Hz
705000000 Hz 711000000 Hz 717000000 Hz 723000000 Hz
Signal to Noise Ratio 37 dB 36 dB 36 dB 36 dB 37 dB 37 dB 38 dB
38 dB
Downstream Modulation QAM256 QAM256 QAM256 QAM256 QAM256 QAM256
QAM256 QAM256
Power Level
The Downstream Power Level reading is a snapshot taken at the time this
page was requested. Please Reload/Refresh this Page for a new reading
0 dBmV -1 dBmV -1 dBmV -1 dBmV -1 dBmV 0 dBmV 0 dBmV 1 dBmV

Upstream Bonding Channel Value
Channel ID 3 1 2 4
Frequency 30200000 Hz 17400000 Hz 23800000 Hz 36600000 Hz
Ranging Service ID 7992 7992 7992 7992
Symbol Rate 5.120 Msym/sec 5.120 Msym/sec 2.560 Msym/sec 5.120 Msym/sec
Power Level 41 dBmV 41 dBmV 38 dBmV 40 dBmV
Upstream Modulation [4] 16QAM
[2] 64QAM
[4] 16QAM
[2] 64QAM
[3] QPSK
[3] 16QAM
[2] 64QAM
[4] 16QAM
[2] 64QAM

Ranging Status Success Success Success Success

Signal Stats (Codewords) Bonding Channel Value
Channel ID 17 18 19 20 21 22 23 24
Total Unerrored Codewords 29160951386 29160125781 29160129343
29160128668 29160098379 29160057034 29159825336 29159451723
Total Correctable Codewords 3106 2757 6792 13887 20869 51354
113548 165190
Total Uncorrectable Codewords 4952 1906 2551 4315 3557 15497
186133 509452