Emergency Transfer

[Mugsiensedgwick]

I am needing a new ring generator the old one is showing signs it may be giving up.
I opened a ticket with Avaya and they sent out a tech with a new RG. Of course I found out we need to kill power to the switch for 15 minutes or so while we change it out. This is a hospital so we need to do it when calls are at a minimum.
Anyway I got to looking at how calls would be handled sans the switch and found 5- 808A Emergency Transfer panels. Only thing I can see is the -48V on the last pair of the 66 block. nothing to a station and nothing to a CO trunk. So I'm thinking I'm glad I looked into it before we need it.
I'm having a little trouble figuring out how they work.
I see that if we loose -48V the ETP relays close and calls go directly from CO trunk to an analog station which has become just an analog telephone.
My questions:
1.) My ETP is optioned to ground start, will a 2500 phone handle that?
2.) Why so many ETP panels (5) won't each ETP handle 5 lines?
3.) What triggers the CO to send calls to the POTS trunks and not the PRI trunks?
Thanks in advance,
-Randy

 

[Mugsiensedgwick]

Oh, I forgot it's a G3si V11

 

[Mugsiensedgwick]

Sorry guys, here is what I found out.
Question 1.) My ETP is optioned to ground start, will a 2500 phone handle that?
-No, not without a special phone to give a ground.
Question 2.) Why so many ETP panels (5) won't each ETP handle 5 lines?
-Yes, each panel will handle 5 lines each one has 3 inputs. One for CO trunk, One for the station to the switch and one telephone the telephone.
Question 3.) What triggers the CO to send calls to the POTS trunks and not the PRI trunks?
-When the switch dies it kills the PRI trunks and the CO sees that as a busy condition and sends calls to the 'roll over' analog trunks.

Check me out guys, I may have some of this wrong and I need it to be right.
Thanks,
-Randy