Fiber Optic Reference Guide: A Practical Guide to Communications Technology, Third Edition
This guide is an ideal primer for newcomers to the fiber optics industry as well as a useful reference guide for seasoned fiber optics veterans.
TABLE OF CONTENTS Fiber Optic Reference Guide: A Practical Guide to Communications Technology, Third Edition
H
- Half-duplex
- A bidirectional link that is limited to one-way transfer of data, i.e., data can't be sent both ways at the same time.
- Hard-clad Silica Fiber
- An optical fiber having a silica core and a hard polymeric plastic cladding intimately bounded to the core.
- HBT
- Abbreviation for heterojunction bipolar transistors. A very high performance transistor structure built using more than one semiconductor material.
- HDSL
- Abbreviation for high data-rate digital subscriber line. A DSL operating at a high data rate compared to the data rates specified for ISDN.
See also DSL.
- HDTV
- High-definition television. Television that has approximately twice the horizontal and twice the vertical emitted resolution specified by the NTSC standard.
- Headend
- 1. A central control device required within some LAN/MAN systems to provide such centralized functions as remodulation, retiming, message accountability, contention control, diagnostic control, and access to a gateway. 2. A central control device within CATV systems to provide such centralized functions as remodulation.
See also LAN (Local Area Network).
- HFC
-
See Hybrid Fiber Coax (HFC).
- Hero Experiments
- Experiments performed in a laboratory environment to test the limits of a given technology.
- Hertz
- One cycle per second.
- HIPPI
- High performance parallel interface as defined by ANSI X3T9.3 document.
- HP
- Abbreviation for homes passed.
- Hybrid Fiber Coax (HFC)
- A cable construction that incorporates both fiber optic transmission components and copper coax transmission components.
- Hydrogen Losses
- Increases in fiber attenuation that occur when hydrogen diffuses into the glass matrix and absorbs light.
- Hz
-
See Hertz.
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