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Application NotesTransition Networks Makes Remote CDMA Network Deployment Possible A wireless telephone service provider was looking for an affordable solution to connect Nortel cellular switches over long distances. Nortel Networks’s cellular switches are only available with multimode fiber interfaces. These interfaces are used to connect their switches in a Central Office to a MicroCell switch in a Base Transmit Station, where the cellular antennas are located. This works well in densely populated areas where the Base Transmit Stations are located relatively close, within 2 km, to the Central Office. The wireless service provider wanted to offer their services in rural areas. But the number of potential customers in these sectors didn’t justify the large capital expenditures required to install additional Central Offices and Base Transmit Stations. What they needed was a solution to connect the Base Transmit Stations back to their Central Office over distances greater then the multimode cable could handle. Single mode fiber cable has the bandwidth capabilities to transmit signals over the distances required by the service provider. By utilizing Transition Networks’s® single mode to multimode 622Mbps converters, they were able to use single mode fiber cable to connect the Base Transmit Stations located up to 60km from the Central Office. The Transition Networks solution has allowed the service provider to save time and money in their network deployment, and reduced the hardware requirements to provide wireless services to customer in these remote cellular sectors. In the diagram, Transition Networks’s 13-slot Point System Chassis, housing several single mode to multimode converters, was mounted in the same rack as the Nortel Cellular switch. Short multimode patch cables connected the switch to the media converters. Next the converters were connected to the single mode fiber installed between the central office and the various Base Transmit Stations located throughout the rural areas where the service provider wanted to offer their wireless services. Within each Base Transmit Station, a Transition Single Slot chassis and another media converter was installed to make the final connection to the Nortel MicroCell Switch which interfaces with the antennas. The single mode to multimode converters offered by Transition Networks are not protocol specific, but are based on the data transmission speed. In this example, the Nortel equipment uses a proprietary protocol, which transmits at 634 Mbps and the Transition Networks converters were able to work with that data rate. Transition also offers similar converters designed to work in Fast Ethernet (100Mbps) and Gigabit Ethernet (1000Mbps) environments. Transition Networks is the leader in media conversion technology; offering a wide array of products including Ethernet, Fast Ethernet (FX and SX), Gigabit Ethernet, 10/100 rate converters, T1/E1, DS3, OC3, OC12, RS485, V.35, Token Ring and more. Our Point System chassis provides users with manageability, reliability, and future proofing. The Point System offers fully SNMP compliant read/write software including web-based management. The chassis also provides for redundant management, redundant power (AC or DC), converters that can be upgraded in the field, and more. Please contact Transition Networks for more information and how we may be able to help you deliver data services to your customers. |
