Content

| 10.2 |  | Introducing Transparent LAN Service Architecture |
| 10.2.5 |  | Role of QoS in TLS |

QoS becomes an important part of the optical network with the implementation of TLS, especially with shared bandwidth circuits. QoS is used to prevent one shared bandwidth node from starving the bandwidth from others. It can also be used to guarantee certain levels of service for all drops during times of peak usage.

Customers using private shared bandwidth services to connect a distributed campus network might also benefit from the implementation of QoS, as it allows the customer to extend their own QoS model across the WAN network to other sites.

To summarize, TLS provides for either dedicated point-to-point or shared point-to-multipoint communication. IP+Optical reduces packet overhead, allowing for increased bandwidth efficiency and allowing for TLS to be layered directly onto the optical layer. QoS plays a large role in TLS networks, guaranteeing bandwidth to customers and nodes.

In the next section, the module will discuss running Gigabit Ethernet over various transport mechanisms such as SONET, DPT, and DWDM.