In the context of Nokia 7750 SR, the 'Assured' class type is designed for non-real-time customer traffic that needs some committed bandwidth. This type of traffic prioritizes the assurance of a certain level of service without the stringent requirements for real-time delivery that other classes, like 'Gold' or 'High Priority', might need. 'Best Effort' does not guarantee any committed bandwidth, making 'Assured' the best fit.