Mitel 3300 - Page 54

Hardware Technical Reference Manual
46
• Four On-Premise (ONS) lines
• Two Power Fail Transfer (PFT)/System Fail Transfer (SFT) ports
• One Loudspeaker Paging circuit.
LS CLASS
Custom Local Area Signaling Services (CLASS) is supported on embedded LS trunks and ONS
lines. CLASS allows the 3300 ICP system to pass Calling Line ID digits and CLASS name
information to display sets that support Caller ID functionality.
ONS Lines
The ONS line circuits connect standard telephones with line loop resistances usually less than
400 ohms. The ONS line circuits are used to connect internal telephones close to the system.
The ONS line circuit has the following features:
• On-hook signal transmission for CLASS function.
• Hardware ring trip with zero crossing.
• 48V tip and ring DC voltage in on-hook state.
• Off-hook detection by loop current.
• Software-controlled AC line and Balance impedance setting.
• First two ONS ports are protected (AMB Version III card only). Only the CX/CXi and MXe
Controller (PN 50005090) support protection for these ONS ports.
Table 16: ONS Station Line Circuits for the AMB
Attribute AMB (v1 to v3)
Battery Reversal
2
all regions
Constant Current 25 mA
DC Leakage Resistance Immunity 10 kohm
Dial Pulse Detection No
External Loop Drive Capability (Ringing Range) 1200
1
ohm
Earth Recall detection No
Ground Button detection No
Ground Start detection No
Loop Current Limit 25 mA (up to 1600 ohms (including 400 ohm
set))
Loop Feed Type constant
Loop status LED none
Low level diagnostics Yes
Message Waiting Cadence SW controlled. 300 ms on/1500 ms off
Message Waiting Indication
3
Yes
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