reply to bbeesley
Re: [OK] How much of Cox's network is on UPS power? So is it safe to assume that a momentary outage should NOT be causing a drop, and Cox probably has a malfunctioning UPS somewhere up the line from me (but probably not too terribly far away)?
said by bchandler02:correct, a momentary loss in power should not cause a loss of the cable network
So is it safe to assume that a momentary outage should NOT be causing a drop, and Cox probably has a malfunctioning UPS somewhere up the line from me (but probably not too terribly far away)?
that said, Cox has fairly sophisticated monitoring for it's power supplies so it would be pretty unlikely for them to have one go hinky without knowing about it
Ok, thanks. I'm going to wait until I have another momentary outage (been stable yesterday and today), if it causes another drop I'll PM CT1 since I'm sure he will understand the problem much easier than the local call center.
Thanks for the info, was educational to learn about the cable version of PoE.
reply to bbeesley I took a quick pic of an open power supply at the NCTC show in Austin this week so folks could see what was in those boxes hanging on the poles (sorry it's so blurry..the lighting was pretty low in the convention room and I used my phone instead of my camera)
The upper section is the power supply itself - this one is showing a 90VDC output.
The little black box with the green LED display on the right is a telemetry unit that allows the operator to remotely monitor the power supply and battery status
The batteries can be clearly seen in the lower tray. This is what provides the standby power in the event of an outage
These units may or may not be backed up with generators powered by natural gas and where they aren't there are generally disaster plans in place to deploy portable generators in the event of a long-term power outage.
I would guess 8 hours is the target. This is probably more to support VOIP - cable phone service than to support the watching of MTV for 8 hours if the power fails.
Telcos have government mandates to give 8 hours for 911 support. So if Cox wants to play in that market they have to match such a requirement with cable.