DESC: The ADTRAN Total Access Ear and Mouth /Transmit Only Dataport (E&M/TO) is an access module that plugs into a single channel slot of a Total Access 1500 platform. It provides an interface between a platform PCM interface and a Voice Frequency (Voice Frequency) transmission facility with E&M DC signaling supervision. The unit is multifunctional and can be provisioned to operate in two-wire E&M, four-wire E&M, two-wire TO, and four-wire TO. The primary applications for the E&M/TO channel unit are for providing PBX foreign exchange at the customer premises, or tandem central office applications. The channel unit is intended only for interface with intro-building wiring, and it is not equipped with outside plane metallic interface lightning and power cross protection. The E&M/TO card can also be deployed in a Total Access 750 or Total Access 850. ??The E&M/TO features a four-wire 600W or two-wire 600W + 2.15 mf VF interface with DC isolation. Provisioning is accomplished through on boar...