Used as a pair, the AT-MC605 provides up to 100 Mbps/60 Mbps of data transfer, while supporting POTS service over phone-grade, twisted-pair, wiring (CAT1, 2, 3) at distances up to 3km or 10, 000 feet. These units are the ideal solution for providing data on 'last-mile' twisted pair circuits or existing in-building wiring. Standard Ethernet operation is preserved end-to-end, retaining VLAN tags, & Ethernet MAC information across the link, while higher layer protocols are passed transparently. 10/100 Mbps Ethernet operation is supported simultaneously with POTS, ISDN or PBX signaling, without disruption. The AT-MC605 provider unit is available as a compact standalone unit for installation at the central office, or alternatively, it can be rack mounted in the standard AT-MCR12 chassis from Allied Telesis, capable of housing up to twelve units in one compact chassis with a redundant power supply, simplifying wiring & minimizing space requirements.