 of next- OC-192 generation product OpTera line. Metro 3100 OpTera OpTera OpTera Metro 3500 Metro 3400 Metro 3100 Subtending OC-12/48/192 ring OpTera Optical hubbing Metro 3400 OpTera OpTera Metro 3400 OpTera Metro 3400 OpTera Metro 3100 Metro 3100 Terminating end user services Table 4-3 Edge (User Handoff) Core (Network Handoff) Three Forms of Next-Generation Ethernet SONET SONET Products SONET Packet (RPR) Next-generation SONET Ethernet SONET Hybrid: packet (RPR) on some Ethernet slots and TDM other slots Chapter 4 Nortel OPTera Metro 3400 Targeted for medium-sized businesses, this offers an OC3/12 line rate with available tributaries, including up to 84 DS1s, 4 DS3s/EC1s, 4 OC-3s/3cs, 8 100Base-T Ethernet, or mixed. Nortel OPTera Metro 3500 This can be used for head-end applications with a high-density drop requirement. It offers an OC3/12/48 line rate with an in-service upgrade plan to OC-192. Sixteen l DWDM capability ensures future bandwidth scalability. Available tributaries include up to 84 DS1s, 48 DS3s/ECs, 32 OC-3s, 8 OC-12s, 32 100Base-Ts, 8 GbE, or mixed (utilizes RPR). A set of distributed packet switch modules integrated into the Nortel OPTera Metro 3000 Multiservice Platform series enables connectionless, packet-based, and shared-bandwidth networking. With this approach to improved metro access/metro core support, packet- based data-networking modules can be added to a SONET platform to enable it to support a packetized/STDM uplink on the network side. These plug-in modules transform Nortel OPTera Metro 3300/3400/3500 Multiser- vice Platform and TransportNode OC-48 classic network elements into hybrid systems capable of concurrently supporting high-speed data services, voice traffic, and other traditional TDM (circuit-based) service offerings. With these plug-ins, carriers and service providers can deploy and upgrade a single network infrastructure that delivers a wide range of rev- enue-generating, resource-efficient data and voice services to their cus- tomers.12 Although data packets can always