Point-to-point lines can be facilitated by many types of circuits. These include T1, DS3, OC3 and Ethernet. Ethernet circuits commonly provide all of the advantages of T1, DS3 and OC3, and often offer added advantages as well. Ethernet circuits usually carry the same service level guarantees as T1, DS3, and OC3, but often provide much more bandwidth for a far lower price. Also, T1, DS3 or OC3 bandwidth is usually static at 1.5 mbps, 45 mbps, or 155 mbps respectively. By contrast, Ethernet can be provided in virtually any increments, like 3, 5 10, 20 ….up to 1000 mbps. Additionally, Ethernet bandwidth can often be burstable; this is not the case with T1, DS3 or OC3. When ethernet is provided over fiber, it can often be burstable. This allows a customer to commit to and pay for a minimum amount of bandwidth but burst above the minimum as needed to accommodate peak business needs. For example, a business can commit to pay for 100 mbps, but during peak times, bandwidth usage can burst as high as 1000 mbps when needed. When bandwidth bursts above the minimum bandwidth committed to by a business, the customer only pays extra for the amount of bandwidth above 100 mbps that is actually used, and they only pay for the time that they use the extra bandwidth. Another advantage of Ethernet over the other types of bandwidth mentioned, is that technology has improved to the point where customer premise routing equipment does not need to be as sophisticated and therefore is commonly far less expensive than customer premise routers required to facilitate T1, DS3 or OC3.