IPIQ

H

ELECTRICITY

H04

ELECTRIC COMMUNICATION TECHNIQUE

H04L

TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION

12/00

Data switching networks

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H04L12/64

Hybrid switching systems

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H04L12/6418

Hybrid transport

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H04L2012/6432

Topology

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H04L2012/6437

Ring

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