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Network Model Vendor A’s ROADM ring Vendor B’s Mesh network | | +--------+ +--------+ | +-------+ +-+ +-+ +-------+ | ROADM | | ROADM +---|---+ PXC +-+D| |D+-+ PXC | | or WXC +========+ or WXC +---|---+ +-+W+=====+W+-+ | | (LSC) | | (LSC) +--|TP|-+ (LSC) +-+D| |D+-+ (LSC) | +---+----+ +--------+ | | +-|M| |M+-+ | || || | +++++++++ +-+ +-+ +++++++++ || || | ||||||| ||||||| || +--------+ || | +++++++++ +++++++++ || | ROADM | || | | DWDM | | DWDM | ====+ or WXC +==== | +--++---+ +--++---+ | (LSC) | | || || +--------+ | +--++---+ +--++---+ | | DWDM | | DWDM | | +++++++++ +++++++++ | ||||||| ||||||| | +++++++++ +-+ +-+ +++++++++ | | PXC +-+D| |D+-+ PXC | | | +-+W+=====+W+-+ | | | (LSC) +-+D| |D+-+ (LSC) | | | +-+M| |M+-+ | | +-------+ +-+ +-+ +-------+ |