Difference between cascading mode and non-cascading mode

TOM boards can work in cascading or non-cascading mode. In cascading mode, the total client-side service rate for each TOM board must be less than or equal to 2.5 Gbit/s. In non-cascading mode, the total client-side service rate for each TOM board must be less than or equal to 10 Gbit/s. When working in cascading mode, each TOM board can map a maximum of eight client-side services into one ODU0 or ODU1 signal. When working in non-cascading mode, it can map a maximum of four client-side services into one ODU0 or ODU1 signal.
To map more than four client-side services into one ODU1 or ODU0 signal, the cascading mode is recommended.
To map four or less client-side services into one ODU1 or ODU0 signal, the non-cascading mode is recommended.

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