The ZXMP M720 is a compact OTN equipment features high integration, large capacity and smooth upgrade, provides flexible and mature protection schemes and supports flexible traffic grooming. The sub-rack of ZXMP M720 is only 6RU high and single cabinet supports 6 sub-racks installation. One sub-rack can provide 14 slots, four sub-racks support 40 wavelengths, resulting in equipment room space saving and power consumption reduction and greatly lowering operation & maintenance expense.