NEC Univerge sv8500 Manual page 869

Power Failure Transfer (PFT)
MG-COT has six MG (COT) ports and one PFT port. PFT connects the PFT port to one MG port (MG0)
directly when some failure has occurred. Therefore, analog terminal is connected to PSTN network and
then call origination to C.O. line becomes available. PFT is activated in following cases.
• Power failure of MG-COT
• IP link failure
onds) expires;
(a) when any calls are not in progress on MG-COT: immediately switched to PFT
comes available.
(b) when any calls are in progress on MG-COT: switched to PFT after cutting off MG side
line becomes available.
The PFT service is not available for the UG50.
Note:
PFT
Release of PFT
PFT is released under the following conditions:
• After rebooting, IP link with the Telephony Server is established
• Release of the lines activating over PFT function are supervised.
→ immediately switched to PFT, PFT line becomes available.
→ depending on the connection status when health check time-out timer (150 sec-
Connecting Diagram of PFT Function
MG-COT
IP Network
VOL.2-616
Change over when failure occurs.
PFT
MG0
MG1
MG2
COT
MG3
MG4
MG5
VoIP CODER
Interface to LAN
MG-COT Card [SCA-6COTB]
Note
→
PFT line be-
PSTN
COT: Central Office Trunk
PFT: Power Failure Transfer
→
PFT