With the growth in data traffic, modern metropolitan area networks are moving away from traditional circuit-switched networking technologies towards high-speed packet-switched networking technologies, supporting best data traffic, offering high flexibility, cost-effective and easy-installation solution. Modified packet bursting (MPB) is introduced in packet-switched networks to improve protocol transmission efficiency and, accordingly, network performance. Circuit emulation service (CES) is introduced in packet-switched networks in order to support traditional TDM (circuit-switched) traffic. This paper presents the performance analysis of these two technologies on an all-optical Ethernet ring, demonstrating CES performance improvement thanks to MPB