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2. ISDN Block
Composition: / ISDN I/F IC (IC500, IC501) / ISDN Transformer
(T500, T501) etc. / / Circuit Operation: / This circuit has the S-Bus
interface circuit and the ISDN lower LAYER (LAYER 1 only)
control circuit. / The component switches B and D channel
between the S/T interface and the PCM Highway I/F. /
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