IEEE Std 802.7-1989 IEEE Recommended Practices for Broadband Local Area Networks -Description

Abstract: IEEE 802.7-1989, IEEE Recommended Practices for Broadband Local Area Networks (LANs) specifies the design, installation, and test parameters for a broadband cable medium. The medium supports the communication of 802.3b, 802.4, video, and narrow-band radio frequency (RF) modem devices. The broadband bus topology consists of amplifiers, coaxial cable, and directional couplers that create a full duplex directional medium. Inbound signals flow from user outlet transmitters to a central headend location. The headend processes the signals and then transmits the signals via an outbound path to all the user outlets. The medium utilizes frequency division multiplexing (FDM), which supports the simultaneous coexistence of services. Each service is assigned a unique inbound and outbound channel frequency.

Content

• 1. Introduction
• • 1.1 Scope
  • 1.2 Assumptions
  • 1.3 Document organization
  • 1.4 Definitions
  • 1.5 Medium overview
  • • 1.5.1 Path loss
    • 1.5.2 Loop Loss
    • 1.5.3 Frequency division multiplexing (FDM)
  • 1.6 Referenced Standards
  • • 1.6.1 Connectors
• 2. Medium specifications
• • 2.1 Purpose
  • 2.2 Frequency Range
  • 2.3 Path Loss and Loop Loss
  • • 2.3.1 Single Cable Inbound
    • 2.3.2 Single Cable Outbound
    • 2.3.3 Looped dual cable system
  • 2.4 Transmit Signal Levels
  • • 2.4.1 Derating formula
  • 2.5 Carrier-to-Noise Ratio (CNR)
  • • 2.5.1 Single Cable Inbound CNR
    • 2.5.2 Single Cable Outbound CNR
    • 2.5.3 Dual Cable CNR
  • 2.6 Intermodulation Distortion
  • • 2.6.1 Second order distortion
    • 2.6.2 Third order distortion
  • 2.7 Channel Frequency Response
  • 2.8 Incidential Modulation (Hum)
  • 2.9 Characteristic Impedance
  • 2.10 Outlet return loss
  • 2.11 Outlet Isolation
  • 2.12 Cable System Signal Leakage
  • 2.13 Environmental
  • 2.14 Terminations
  • 2.15 Drop Cables
• 3. Medium Utilization
• • 3.1 Spectrum Management
  • • 3.1.1 Usable Spectrum
    • 3.1.2 Spectrum allocation
  • 3.2 Organization of the Spectrum
  • • 3.2.1 Channel Conventions
    • 3.2.2 The CATV Frequency Plan
    • 3.2.3 Channel Designations
    • 3.2.4 System Bandwidth Nomenclatures
    • 3.2.5 IEEE Channel Conventions
  • 3.3 Reserved Spectrum
  • • 3.3.1 Frequency Rolloff Response
    • 3.3.2 Leakage Regulations
    • 3.3.3 Sensitive Spectrum Regulations
    • 3.3.4 Pilot and Transponder Frequencies
    • 3.3.5 Ingress Accumulation
    • 3.3.6 Off-Air Channels Ingress
    • 3.3.7 Ingress monitoring
    • 3.3.8 Secured Bandwidth
  • 3.4 Spectrum Allocation
  • • 3.4.1 Single and Dual Cable Systems
    • 3.4.2 Allocating IEEE 802.3b Services
    • 3.4.3 Allocating IEEE 802.4 Services
    • 3.4.4 Allocating Other Services
    • 3.4.5 Other Countries
    • 3.4.6 Protocol Timing Limitations
    • 3.4.7 Group Delay Distortion
  • 3.5 Initializing Services
  • • 3.5.1 Calibrating services to rms power
    • 3.5.2 Good Neighbor Policies
    • 3.5.3 Amplifier Overload
  • 3.6 Spectrum Maintenance
  • • 3.6.1 Spectrum Monitoring
    • 3.6.2 Status Monitoring
    • 3.6.3 Use of Inbound Switching
    • 3.6.4 Status Monitoring Channels
• 4. Documentation
• • 4.1 Tracking System
  • 4.2 Design Package
  • 4.3 Layout Drawing(s)
  • 4.4 Alignment Specifications
  • 4.5 Power/Grounding System Detail(s)
  • 4.6 Bill of Materials
  • 4.7 System design parameters
  • 4.8 System Schematic Drawing(s)
  • • 4.8.1 Drawing Key
    • 4.8.2 Scale
    • 4.8.3 Location identification tags
    • 4.8.4 Component Identification Tags
    • 4.8.5 Amplifier Table
  • 4.9 Installation Documents
  • 4.10 Certification Report
  • 4.11 Maintenance Records
• 5. Installation Guidelines
• • 5.1 Construction practices
  • 5.2 Site Preparation
  • 5.3 Aerial Installation
  • 5.4 Underground Construction
  • 5.5 Building Construction
  • • 5.5.1 Semi-Rigid Cable Installation
    • 5.5.2 Flexible Cable Installation
    • 5.5.3 Miscellaneous Guidelines
  • 5.6 System test
  • • 5.6.1 Installation
    • 5.6.2 Activation
    • 5.6.3 Certification
    • 5.6.4 Optional tests
    • 5.6.5 Reference
  • 5.7 Maintenance
  • • 5.7.1 Purpose
    • 5.7.2 Administration
    • 5.7.3 Monitoring
    • 5.7.4 Status monitoring
  • A.1 Abbreviations and acronyms
• Annex D Bibliography
• Annex E Glossary

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