Panasonic KX-TD500 Installation Manual page 40

1.6 Specifications
LCOT Card (KX-T96180) Functions
Loop Start Central Office Trunk card (8 CO Lines/ card)
1.
Loop start CO interface.
CPC detection, 1 DTMF generator.
With loop start, you seize a line by bridging through a resistance the tip and ring (both
wires) of your telephone line.
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 (KX-T96180) Operation
The LED indicator on the LCOT card lights when the system resets or LCOT local reset occurs.
GCOT Card (KX-T96181) Functions
Ground Start Central Office Trunk card (8 CO Lines/card)
1.
Ground start CO interface.
CPC detection, 1 DTMF generator.
A way of signalling 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 (KX-T96181) Operation
The LED indicator on the GCOT card lights when the system resets or GCOT local reset
occurs.
DID Card (KX-T96182) Functions
Direct Inward Dialling card
Wink start/immediate start DID interface.
(4 circuits/card)
45 V used in circuits is originated from DC-DC converter on DID card.
The DID card will receive pulse signals only.
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System Outline