[Outages-discussion] [outages] [META] Some outages are planned

[Chris Boyd]

> On Sep 14, 2020, at 6:46 PM, Jay R. Ashworth <jra at baylink.com> wrote:
> 
> ----- Original Message -----
>> From: "Chris Boyd" <cboyd at gizmopartners.com>
> 
>> I wish they had shown how they reconnected the subscriber lines to the 5ESS. The
>> “cut” is the easy part, but the “over” would be more interesting.
> 
> Over the preceding 3 to 4 weeks, they multipled each line on the IDF to the
> incoming 5E, leaving it connected to the cables you saw chomped.
> 
> They probably then asked each line card "do you see voltage" and maybe walked 
> a single burst of ring along each row (I'm not sure if the 5E line card is
> equipped to make those measurements, but I'd assume it's though worth the
> component space). 
> 
> Then, once they did the cut, they fished out the IDF to Xbar cables, and, 
> presumably, recycled them.
> 
> The cutover time is 47 second, but the prep and clean probably takes 3 or 4
> guys two months.

So the guy typing at the MAP (do they call them maintenance administrative positions on 5ESS? I’m only a little familiar with Nortel DMS250.) was probably activating the line cards. I wonder if the dramatic switch flip toward the end actually did anything. Definitely understand the amount of pre- and post- work that has to be done. I’ve worked on the IP routing team to support several VoIP virtual cutovers of large subscriber bases from one carrier to another.