Mitel 3300 - Loop Start Trunks; System Fail Transfer (SFT)

Hardware Technical Reference Manual
82
• ports 1 and 2 on the MXe Controller (PN 50005090) with AMB Version III.
The ONSP ports are suitable for off-premise applications and meet the requirements of
60950-01 and IEC 55024. Regular ONS ports are intended for on-premise applications
only.ONSP ports use the same loss plan settings as regular ONS ports.
Loop Start Trunks
System Fail Transfer (SFT)
System Fail Transfer (SFT) relays are available on the
• Analog Main Board (AMB) for the CX/CXi, CX/CXi II, and MXe controllers
• Universal ASU, and
• ASU II or AX controller with a 4 + 12 Combo Card.
The AMB for the CX/CX, CX/CXi II, and MXe controllers provides two System Fail Transfer
(SFT) relays. The Universal ASU and the Combo card each provide four System Fail Transfer
(SFT) relays, one per LS trunk circuit. If any of the following events occur, the relays close:
• Failure of the 3300 ICP controller
• Interruption of the system AC power
• Universal ASU reset
• Loss of the CIM link between the 3300 Controller and ASU.
When the relays close, ONS ports are automatically connected to the LS trunk circuits. After
power is restored and communication is re-established with the controller, the relays open and
the ONS and LS circuits function normally. Any SFT or PFT calls in progress are not cut off.
Relays are switched on a per-circuit basis after the termination of any SFT or PFT (Power Fail
Transfer) call.
Table 54: Loop Start Trunks by ASU Type
Attribute ASU II ASU
50 Hz Meter Pulse Detection No UK only
Loop Disconnect and Loop
Reversal Detection
Yes Yes
Incoming Ring Detection Yes Yes
Status LED per card per circuit