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12.3. EXPLANATION OF BLOCK DIAGRAM / CIRCUIT OPERATION
12.3.1. OPTION CARD (KX-TD61261G)
Composition: / This Doorphone card is composed of the control interface with KX-TD612 and
two doorphone interface and two dooropener interface section. /
1. Doorphone Section
This card has two door phone interfaces. / This door phone
intercom pass is composed of the send amplifier and receive
amplifier circuits which are included in CODEC IC. / These
interfaces have the door phone power supply control circuit
(DCONT) and the door phone call circuit (DCALL). /
2. Dooropener Section
This card has two door opener interfaces. These interfaces are
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