NEC SV8500, Manual

Page: 652 / 3438

VOL.2-399
MCMG Card [SCA-7COTA]
Power Failure Transfer (PFT)
MCMG has one MC port and seven MG (COT) ports. PFT connects one MC port to one MG port directly
when some failure have occurred. Therefore, analog terminal is connected to PSTN network and then call
origination to C.O. Line becomes available. PFT is activated in the following cases:
• Power failure of MC&MG
→
immediately switched to PFT, available as PFT line.
Note:
If each port of MG and MC assigned by PFT function are talking to separate parties immediately before a
power failure, since PFT connects MG port and MC port directly after a power failure, the calling party
will suddenly be connected to a different party.
• IP link failure
→
depending on the connection status when health check time-out timer (150 sec-
onds) expires on MG side
(a) when both MG side and MC side are not used: immediately switched to PFT
→
available as
PFT line.
(b) when any calls are in progress on MG side and MC side is not used: switched to PFT after cut-
ting off MG side → available as PFT line.
(c) when MG side is not used and any calls are in progress on MC side: switched to PFT after re-
booting on detecting the call completion supervising the lines’ recovery on MC side → avail-
able as PFT line.
(d) when any calls are in progress on both MG side and MC side, switched to PFT after rebooting
on detecting the call completion supervising the lines’ recovery on MC side, and disconnecting
the calls on MG side
→ available as PFT line.
Note:
During supervising the lines’ recovery on MC side, MC&MG cannot receive any calls from PSTN line.
All MC port (other than PFT line), after supervising the lines’ recovery on MC side, may not be used until
another IP Link with a telephony server is established. MC-MG(COT) reboots after all MC and MG ports
recover.