SCTE to Develop RF over Glass Standards
April 3, 2008 // Published as a news service by IHS
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The Society of Cable Telecommunications Engineers (SCTE) launched development of a suite of technical industry standards to support wider use of optical fiber in the cable plant.
Focused on a technology called radio frequency (RF) over glass, the standards are touted as enabling cable systems to gain benefits from an expanded use of optical fiber while continuing to deliver cable services and technologies including Data Over Cable Service Interface Specifications (DOCSIS), according to SCTE.
The American National Standards Institute (ANSI)-accredited SCTE standards program is directed by the SCTE Engineering Committee, which approved the RF over glass work program in 2007 and assigned the program's projects to the SCTE Interface Practices Subcommittee (IPS) for development as industry standards.
Once developed and approved as standards, RF over glass is designed to broaden the SCTE standards program's footprint concerning optical fiber.
SCTE has two approved standards in this area:
- ANSI/SCTE 122 2006 - SCTE Recommended Optical Fiber Cable Types for Outside Plant Drop Applications.
- ANSI/SCTE 86 2005 - SCTE Recommended Optical Fiber Cable Types for Outside Plant Trunk and Distribution Applications.
Part of IPS's RF over glass focus was on a document titled IPS SP 910 - RF over Glass System Overview. This working document addresses DOCSIS and cable television's Hybrid Fiber/Coax (HFC) systems, which is an environment where data and video share the same RF spectrum.
Other points of focus for IPS concerning RF over glass are:
- Specification for performance of fiber-optic passive splitters and directional couplers.
- Specification for fiber-optic passive filters.
- Specification for RF over glass gateway RF levels.
- Specification for RF over glass gateway operation: burst transmitter RF input trigger power level range specification.
- Specification for RF over glass gateway optical input and output RF levels and wavelengths.
- RF over glass gateway environmental requirements.
- Recommended practices for mid-split cable equipment and system operations.
Source: Society of Cable Telecommunications Engineers (SCTE).