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The Cisco point-to-point broadband fixed wireless system is an integrated solution, consisting of a Cisco uBR7200 series universal broadband router (Cisco uBR7223, uBR7246, or uBR7246 VXR), one or more wireless modem cards that are installed in the router, and a power feed panel for each wireless modem card. (See Figure 1-1.) A wireless transverter containing the RF amplifier must be purchased from a third-party vendor. These components, coupled with the necessary cables and an antenna subsystem, provide an effective, easily deployed means of providing broadband access without a fiber/wired infrastructure.
As part of an end-to-end solution, the broadband fixed wireless system can be integrated with Cisco's digital subscriber line (DSL) and cable offerings to provide broadband access services. Cisco incorporates Vector Orthogonal Frequency Division Multiplexing (VOFDM), which allows wireless operation in obstructed, non-line-of-sight (NLOS) environments by taking advantage of multipath signals and diversity reception.
The Cisco broadband fixed wireless system provides up to 44 Mbps full-duplex data in a 12 MHz RF channel in the Unlicensed National Information Infrastructure (U-NII) band (5.725 to 5.825 GHz).
Features of the broadband fixed wireless system include:
The examples in this section provide some representative applications of Cisco's broadband fixed wireless system.
Figure 1-2 shows an application providing a broadband access solution, complementary to an existing residential coaxial cable structure of a multiple service operator (MSO). Broadband wireless access can be used to link the MSO's hybrid fiber coaxial (HFC) distribution node to a cable headend that delivers cable access to homes and businesses or multitenant dwellings.
Figure 1-3 shows how broadband fixed wireless can extend the coverage of a local carrier's fiber infrastructure. By linking a fiber node via a wireless link to a new facility, the coverage of a local carrier can be extended to many new customers more easily and efficiently than laying new fiber or leasing other carriers' fiber.
Figure 1-4 shows a large business campus with many buildings spread throughout a metropolitan area. Because campus environments require high-speed connections between sites to satisfy their LAN-based applications environment, fiber or possibly Gigabit Ethernet is used for the connection. If these sites are spread over many miles, broadband fixed wireless offers a quick and efficient way to interconnect the multiple buildings.
The Cisco uBR7200 series universal broadband routers are designed to allow two-way transmission of digital data using either coaxial cable or broadband fixed wireless. These routers support IP routing with a wide variety of protocols and any combination of Ethernet, Fast Ethernet, High-Speed Serial Interface (HSSI), serial, and Asynchronous Transfer Mode (ATM) media. Network interfaces reside on port adapters that provide the connection between the router and external networks. Cable or wireless interfaces reside on modem cards and provide the connection to cable or wireless networks.
Other features include:
The Cisco uBR7223 has two slots for double-width modem cards, one slot for a single-width port adapter, one slot for an input/output (I/O) controller, and one slot for a network processing engine. A port adapter can only be placed in the port-adapter slot. Modem cards can be placed in either of the two available double-width slots.
The Cisco uBR7246 and Cisco uBR7246 VXR have four double-width slots for modem cards, two slots for single-width port adapters (which can also function as a single slot for a dual-wide port adapter), one slot for an I/O controller, and one slot for a network processing engine. Port adapters can be placed in either of the two available slots. Modem cards can be placed in any of the four available double-width slots.
For further information regarding the Cisco uBR7200 series routers, including detailed installation and basic configuration instructions, refer to the Cisco uBR7200 Series Universal Broadband Router Hardware Installation Guide.
The wireless modem card installs in a modem card slot of a Cisco uBR7200 series router. It is configured through the router's system console or via the CiscoView network management system. The wireless modem card provides the control and data interface to the system's digital motherboard and the radio frequency (RF) subsystem in the wireless transverter. It also provides the up/down conversion from baseband to intermediate frequency (IF).
Wireless modem cards consist of the following components:
For further information regarding the wireless modem card, including detailed installation and configuration information, refer to the Cisco uBR7200 Series Universal Broadband Router Wireless Modem Card and Subsystem Installation and Configuration document.
The power feed panel serves as an interconnection device between the wireless modem card, the wireless transverter, and a -48 VDC power supply. The main purpose of this unit is to provide DC power, transmit and receive IF signals, and control signals to the wireless transverter. In addition, the unit contains circuit breakers for the DC power and secondary lightning protection circuitry for the control cables.
The power feed panel consists of the following components:
One power feed panel is required for each modem card. Each power feed panel supports two wireless transverters and two antennas (main and diversity).
For further information regarding the power feed panel, including detailed installation information, refer to the Cisco uBR7200 Series Universal Broadband Router Wireless Modem Card and Subsystem Installation and Configuration document or Cisco Broadband Fixed Wireless System Power Feed Panel Replacement Instructions.
Posted: Thu Jul 18 17:34:23 PDT 2002
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