Panasonic KX-T336 System Reference Manual page 40

9.00 PCOT Card
Functions
PCOT (KX-T96180)-----Loop Start Central Office
Trunk with Pay Tone
Detection card (4 CO
Lines/card)
(1)Loop start CO interface.
CPC detection, 1 DTMF driver.
With loop start, you seize a line by bridging
through a resistance the tip and ring (both
wires) of your telephone line.
Pay tone detection (12kHz/16kHz)
(2)Power failure transfer (PFT) by each port.
Tip/Ring of CO are connected to a CO
interface circuit, and directly to PCOT PFT
modular. When power failure occurs, CO
Tip/Ring leads are directly connected to SLT
Tip/Ring leads, but PCOT PFT modular and
SLT PFT modular should be connected each
other with connection cord 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 PCOT of a system is activated.
Operation
LED indicator on the PCOT card lights when the
system reset or PCOT local reset occurs.
10.00 GCOT Card
( for U.S.A. and Canada only)
Functions
GCOT (KX-T96181) ----Ground Start Central Office
(1)Ground start CO interface.
CPC detection, 1 DTMF driver.
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.
Operation
LED indicator on the GCOT card lights when the
system reset or GCOT local reset occurs.
1-E-6
(70695)
Trunk card (8 CO Lines/
card)