
Proprietary TDM interfaces
• Used to connect ISDN devices inside equipment
• 4 to 7 wire interfaces
– Clock
– Data In
– Data Out
– Start of frame indicator
• Several versions defined by ASSP vendors
– CHI (Concentration Highway Interface): Lucent
– IOM-2 (ISDN Oriented Modular Interface): Infineon, AMD
– IDL (Inter-chip Digital Link): Motorola
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