PacketLight Networks

 

Motorola's Gigabit Passive Optical LAN is similar to the GPON gear deployed in residential fiber-to-the-premises networks but re-tooled for enterprise networks.

Unlike a typical enterprise LAN, which stems from a central core switch/router to "work-group" switches on each floor, Motorola's GPON LAN system stems from a central access switch to passive optical splitters on each floor that, unlike work-group switches, don't require power or cooling.

Those splitters distribute the network to as many as 32 "work-group terminals (WGTs)," which are functionally analogous to the home-side optical network terminals in residential networks. Each WGT has four 10/100/1000-megabit-per-second Ethernet ports to serve a mix of devices such as phones, computers and wireless LANs, which can distribute connectivity even further. And the end devices in each work group would share bandwidth (2.4 gigabits per second downstream, 1.2 Gb/s upstream) with the others in their splitter group. Motorola said each one of its access switches can serve up to 7,000 stationary Ethernet devices.

Using GPON for business LANs not only eliminates the need for work-group switches on each floor, Motorola said, it eliminates the typical 100-meter distance limits inherent in most Ethernet LAN networks. GPON gear has a range of about 20 kilometers between the switch and the terminating gear, Motorola said.


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