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Technology Stocks : MRV Communications (MRVC) opinions? -- Ignore unavailable to you. Want to Upgrade?

To: Regis McConnell who wrote (16078)	9/30/1999 11:13:00 AM
From: Regis McConnell	Read Replies (2) \| Respond to of 42804

Via the Last Mile thread, anybody want to take a stab at what/if this involves for MRV? Message 11404914 "Editor's Notes The DISCS FiberStar system with RF Return consists of a Host Digital Terminal (HDT) and an Optical Network Unit (ONU). The HDT is located in either the Central Office (CO) or in the neighborhood, but within 10,000 feet of the ONU. Downstream, POTS (plain old telephone service) and other voice services use a 1310 nanometer (nm) optical network to transport telephony traffic from the DISCS Host Digital Terminal (HDT) to the Optical Network Unit (ONU), where the digital signal is down-converted and rendered as 24 analog voice lines. Broadband RF (video and data) is typically placed onto the video transport layer at a Head End or Central Office (CO). Transport of Broadband RF from the Head End/CO to the HDT uses 1550 nm optical transmitters and erbium doped fiber amplifiers (EDFAs). Granular distribution of the Broadband RF is accomplished at the HDT by using splitter optical cross-connects (SWXs) to deliver the Broadband RF signal in an optical format to each ONU. Typically, between 56 and 84 ONUs can be connected. From 8 to 32 ports of RF can be provisioned at each ONU. Wave division multiplexing (WDM) technology is used to multiplex the 1310 nm POTS traffic with the 1550 nm Broadband RF signals at the SWX (within the HDT), thus enabling a single-fiber solution to the ONU for converged voice, video and data services. A WDM within the optical interface unit (OIU) at the ONU separates the 1310 nm and 1550 nm optical signals. POTS signals are converted to baseband telephony signals and relegated to the 24 twisted pair punch-down locations at the ONU. The Broadband RF is split into SCM broadcast video and IP data and transported via coaxial cable to the consumer's television set-top box or cable modem/computer, respectively, for DOCSIS-compliant signalling applications. Upstream transport of RF takes advantage of the unused spectrum within the 1310 nm optical transport. RF Return signals (5 to 42 MHz bandwidth) and POTS signals (0 to 3.088 MHz bandwidth) are multiplexed into a common 1310 nm signal for transport back to the HDT. Bulk transport of return bandwidth allows communication of all RF Return signals, regardless of modulation technique or spectral allocation. Return path testing uses NCTA-recommended practices. Traditional Hybrid Fiber Coax Requires more costly infrastructure -- two separate networks for voice and video/data Requires complex range of equipment including RF amplifiers, series- connected cables, and distributed power supplies. Each of these represents a potential point of network failure. Noise/ingress interference is aggregated from the typical 500 homes served by each node Requires significant power Deep Fiber HFC using DISC*S FiberStar with RF Return Single-fiber network for voice, video and data (a 20-40 percent lower initial capital investment) RF amplifiers not required. The network is passive after the optical-to-RF conversion. Distributed battery power is eliminated. Significantly reduces potential network failure points. Serves 8 to 32 homes per ONU. Requires minimal power. Supports redundant powering via batteries and separate power feeds to each ONU for enhanced reliability. SOURCE Marconi Communications" Regis