Section II - The Protocol Stack
From the Top Down: Layer 1 - Populating the OFDM Waveform with Information

Layer 1 Structure
System Control

IBOC in the Time Domain
Audio Sampling Rate Implications
Frame and Block Duration
Diversity Delay
        AM Time Diversity
        FM Time Diversity
The Symbol

Sync-ing Up
System Control Processing
Differential Encoding
Universal Time

Service Modes
AM Service Modes
FM Service Modes
Backward Compatibility

From Logical to Physical

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Chapter 6: TABLES
6.1 Protocols Addressed in Chapter 6
6.2 IBOC Timing Structure
6.3 System Control Data on OFDM Reference Subcarriers
6.4 Reference Carrier System Control Data Bitmaps
6.5 Example of Differentially Encoded Sync Word
6.6 Hybrid AM IBOC OFDM Subcarrier Groups
6.7 All-Digital AM IBOC OFDM Subcarrier Groups
6.8 Primary FM IBOC OFDM Subcarrier Groups
6.9 Secondary FM IBOC OFDM Subcarrier Groups
6.10 Logical Channel Frame Rates and Robustness (most robust -1; least robust -11)
6.11 Backward Compatibility Default Service Modes for Reserved Expansion Service Modes

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Chapter 6: FIGURES
6.1 AM Layer 1 (From NRSC-5-A with permission)
6.2 FM Layer 1 (From NRSC-5-A with permission)
6.3 IBOC Frame, Block, and Symbol Structure
6.4 Information Flow on AM Logical Channel P1
6.5 Information Flow on FM All-Digtal Logical Channel P1

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