Panasonic KX-TD500 Installation Manual page 40

2.
Power failure transfer (PFT) by each port.
Tip/Ring of CO are connected to a CO interface circuit, and directly to LCOT PFT modular.
When power failure occurs, CO Tip/ring leads are directly connected to SLT Tip/Ring leads,
but LCOT PFT modular and SLT PFT modular should be connected to each other in
advance.
3.
Diagnostic transfer (DT) by each port.
A diagnostic relay is placed in Tip/Ring of each port. During diagnostic test, only one
diagnostic relay in an LCOT of a system is activated.
LCOT Card (Loop Start Central Office Trunk card (8 CO Lines/ card)) (KX-
T96180) Operation
1.
The LED indicator on the LCOT card lights when the system resets or LCOT local reset
occurs.
GCOT Card (Ground Start Central Office Trunk card (8 CO Lines/card)) (KX-
T96181) Functions
1.
Ground start CO interface.
CPC detection, 1 DTMF generator.
A way of signaling on subscriber trunks in which one side of the two wire trunk (typically
the "Ring" conductor of the Tip and Ring) is momentarily grounded to get dial tone.
2.
Power failure transfer (PFT) by each port.
Tip/Ring of CO are connected to a CO interface circuit, and directly to GCOT PFT modular.
When power failure occurs, CO Tip/Ring leads are directly connected to SLT Tip/Ring
leads, but GCOT PFT modular and SLT PFT modular should be connected each other with
connection cords in advance.
3.
Diagnostic transfer (DT) by each port.
A diagnostic relay is placed in Tip/Ring of each port.
During diagnostic test, only one diagnostic relay in a GCOT of a system is activated.
GCOT Card (Ground Start Central Office Trunk card (8 CO Lines/card)) (KX-
T96181) Operation
1.
The LED indicator on the GCOT card lights when the system resets or GCOT local reset
occurs.
DID Card (Direct Inward Dialing card)(KX-T96182) Functions
1.
Wink start/immediate start DID interface. (4 circuits/card)
45V used in circuits is originated from DC-DC converter on DID card.
The DID card will receive pulse signals only.
DID Card (Direct Inward Dialing card)(KX-T96182) Operation
1.
The LED indicator on the DID card lights when the system resets or DID local reset occurs.
System Outline
1.6 Specifications
41