Optical transceiver classification distinguishes network interface components from complete Optical Transport Network products, preserving customs exemption eligibility.

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....Optical transceivers that convert optical signals into electrical signals and vice versa, functioning only as network interface modules, are components or parts of Optical Transport Network products rather than complete Optical Transport Network products. They do not perform complete system functions such as OTN framing, multiplexing, forward error correction or operations, administration and maintenance. Classification therefore falls under CTI 8517 7090 rather than CTI 8517 6290. Because the customs exemption exclusion applies only to complete Optical Transport Network products, it does not cover these transceivers. The claimed exemption benefit remains available, and the Revenue's appeals were dismissed.....