s Cellular services are a lower-cost backup to their fiber- optic-based broadband links than DSL because cabling is not required. Small organizations and even some medium sized companies use cellular as a backup. It may have less capacity than DSL, but the costs are lower, the fiber services rarely fail, and it's possible to designate only to allow key staff to use the backup service. DSL as a Backup Option for Business Customers Medium-sized and large commercial and business customers lease DSL services primarily as a low-cost backup service in the event that their primary Internet www.TechnicalPDF.com access circuits fail. Many of these primary circuits are installed on fiber-optic cabling. The large volume of revenue generated by enterprise customers makes a carrier's investment in fiber-optic cabling for business customers viable. Fiber cabling supports higher speeds than the copper cabling used for DSL and requires less maintenance by providers than copper cabling. For these reasons, major telephone companies are adding more fiber to networks, eliminating DSL, and replacing it with Gigabit Ethernet circuits over newly installed fiber cabling. However, organizations may keep DSL for backup in case service on the fiber crashes or the fiber cable is cut. Cellular Backups for Small and Medium-Sized Organizations-Outgoing Calls Cellular backups are lower-cost options than adding duplicate fiber or DSL. However, in an outage the organization loses incoming calls. In these cases, customers can request that during an outage, their telephone company forward calls to their cellular service. Alternatively, onsite routers capable of load balancing traffic between cellular and fiber-optic lines may be able to automatically fail over to cellular service. Employees generally have cell phones and can make outgoing calls even when there is a fiber cut and service to their building is lost. Cellular service is particularly suited to temporary locations such as pop-up stores, construction trailers, and other temporary location