System Fail Transfer (Sft) - Mitel 3300 ICP Hardware Technical Reference Manual

C 3
HAPTER
Loop Start Trunks by ASU Type (Continued) (Sheet 2 of 2)
Table 3.7:
Attribute
Loop Disconnect and Loop
Reversal Detection
Incoming Ring Detection
Status LED

System Fail Transfer (SFT)

System Fail Transfer (SFT) relays are available on the
Analog Main Board (AMB) for the CXi to CXi II, and MXe controllers
•
Universal ASU, and
•
ASU II or AX controller with a 4 + 12 Combo Card.
•
The AMB for the 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.
The System Fail Transfer ONS ports are physically mapped to the LS trunks as follows:
ONS Port Circuit Assignment to LS Trunk Circuit
Table 3.8:
Universal ASU
ONS Port LS Trunk
Circuits Circuits
13 1
14 2
15 3
16 4
You should plan carefully where you want the ONS ports to terminate within the network. If power is lost
they will provide the only connectivity to the telephone network. The LS trunks do not have to be dedicated
ASU II
Yes
Yes
per card
ASU II or AX controller with 4
+ 12 Combo Card
ONS Port LS Trunk
Circuits Circuits
1 1
2 2
3 3
4 4
C
S
ERVICES
ASU
Yes
Yes
per circuit
AMB in MXe
ONS Port
Circuits
(PLID)
4,1,1,1
4,1,1,2
D
IRCUIT ESCRIPTIONS
U G
NITS AND ATEWAYS
LS Trunk
Circuits
(PLID)
4,1,1,5
4,1,1,6
51