Content

| 10.2 |  | Introducing Transparent LAN Service Architecture |
| 10.2.1 |  | Metro Ethernet services |

Understanding TLS architecture will facilitate network design and installation, as well as long-term operations and support. It is important to understand where TLS fits into an overall optical network architecture.

TLS is an ideal solution for providing shared bandwidth across a wide area, such as a distributed campus design, or for providing high bandwidths, where a LAN-based technology would facilitate operations. Typically, TLS will fall within the metro-to-customer access role.

Four services can be offered by a metro Ethernet service provider:

- High-speed Internet access – Gigabit Ethernet to the point of presence (POP) for Internet access
- High-speed Virtual Private Network (VPN) access – Gigabit Ethernet connected into a Multiprotocol Label Switching (MPLS) backbone using a local MPLS provider edge router
- Transparent LAN services – Gigabit connectivity over a shared multipoint metro LAN
- Point-to-point LAN services – Gigabit point-to-point connectivity

The following section will cover how TLS can be utilized in existing SONET-based networks and natively with the optical layer. The following sections elaborate on TLS in the metro environment in terms of:

- IP+Optical Efficiency
- Point-to-Point Dedicated
- Point-to-Multipoint Shared
- QoS