However, those copper cables get more "lossy" as the frequencies they have to carry get higher, meaning they lose a lot of their signal on the way to the base station, Corning's Cune said. That has left coax behind as new frequencies are adopted, he said. For example, coax isn't good at carrying the 5GHz band, which is crucial in newer Wi-Fi equipment, Cune said.
MIMO, a technology that uses multiple antennas in one unit to carry separate "streams" over the same frequency, is another big limitation of DAS, according to Corning. MIMO antennas for better performance can be found in newer Wi-Fi gear based on IEEE 802.11n and 802.11ac, as well as in LTE. A coax-based DAS with MIMO antennas needs to have a separate half-inch-wide cable for every stream, which is a major cabling challenge, Cune said.
Corning ONE links each antenna to the base station over optical fiber, converting the radio signals to optical wavelengths until they reach the base station. Fiber has more capacity than coax, can handle higher frequencies, and requires just one cable from a MIMO antenna, Cune said. Because of fiber's high capacity, it's relatively easy to bring other mobile operators onto the DAS.
The system is based on optical fiber, but it can be extended over standard Ethernet wiring to provide backhaul for Wi-Fi access points. Each Corning ONE remote antenna unit that's deployed around a building will have two Ethernet ports to hook up nearby Wi-Fi access points, which can use the fiber infrastructure for data transport to wired LAN equipment, Cune said.
Corning ONE is in beta testing at one enterprise and will have limited availability beginning in late June, after which orders can be placed, Cune said. It is expected to be generally available two to three months later. The company expects its main customers to be mobile operators, though most of those operators will arrange multi-carrier services, he said. Enterprises and large building owners increasingly will step in to buy and deploy the DAS, Cune said.
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