AT&T Wavelength Long Haul (formerly EPLS-WAN) is a point-to-point, fixed full-bandwidth Ethernet service that provides inter-city data transport over combined-access (local) and long-haul (core) networks. AT&T Wavelength Long Haul provides a range of speed options depending on the transport.

When we provide AT&T Wavelength Long Haul via 1 Gbps, or 10GigE Premium speeds, once your packets are on the AT&T long haul network, they travel over an optical transport network (OTN). This helps assure you of low latency and a fast recovery from failure–typically within 400 milliseconds.

When we provide AT&T Wavelength Long Haul via Ethernet over Fiber (at 10 Gbps or 100 Gbps) the transport network is our long-haul core optical wavelength network, which uses Dense Wavelength Division Multiplexing (DWDM). In this case, AT&T Wavelength Long Haul operates as an unprotected, point-to-point service via an 802.3 Ethernet signal and provides route diversity and packet collision avoidance; however, recovery from failure requires manual intervention.