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Back to Glossary of Digital Infrastructure Terms

Three-Legged Stool Model

A metaphor for digital infrastructure comprising Transmission, Processing, and Storage, emphasizing that compromise of any leg leads to system failure.
Source: Section III, “Digital Infrastructure Vulnerabilities”

Previous: The Good. The BEAD. The Ugly.

Next: Tier 1, 2, 3

Related Digital Infrastructure Terms

Cascading Failure

Digital Infrastructure Terms

6D Attack Methodology 63-20 Financing

ACP Administrative Expenses Aerial Deployment Aerial Installation Application Model Area Challenge Module ARPA ARPU Assassin's Maces Assassin's Maces (杀手锏, Shashoujian)Asymmetric Autonomous Recovery

BABA Whitelist Compliant Equipment Backhaul Bandwidth BEAD Grant Cybersecurity Requirements BEAD Program BEAD Timelines BIP Bit Blended Domains Broadband Broadband Audit Broadband DATA Act Broadband DATA Maps Broadband Feasibility Study Broadband Service Provider Broadband Serviceable Locations BTOP Bulk Fabric Challenge Buried Fiber Deployment

Cable CAF CAI Capex Capital Projects Program Capital Stack Cascading Failure CBG Census Block Challenge Process CMC Pilot Program Co-op Coax Common Stock Communications Act of 1934 Community Development Financial Institution Community Reinvestment Act Conduit Financing Connectivity Profile Consolidated Appropriations Act of 2021 Content Provider Contested Logistics CPE

Data Packet Davis-Bacon Act (for BEAD)Debt/EBITDA Digital Contested Logistics Digital Divide Digital Equity Act Programs Digital Inclusion Digital Infrastructure Digital Infrastructure as a Strategic Target Digital Sovereignty DPP DSL DSRC

EBITDA EBITDA Margin Economic Development Incentive Eligible Community Anchor Institution Eligible Entity Ethernet Cable EV

Fabric False Confidence Paradox FCC Feasibility Study Fiber Fiber to the Home Fiber to the home/premises/curb/node Final Proposal Formula Grant FRN FTTC FTTH FTTN FTTP

GAN GO Bond Graceful Degradation Grant Adjusted YOC Grant Revenue Anticipation Notes Gross Profit Margin Ground Deployment Guaranteed Bank Loan

High Cost Area

ILEC In-kind Matching Funds Indian Tribe Infrastructure Investment & Jobs Act Initial Funding Availability Initial Proposal Internet Exchange Facility Internet Protocol IRBs IRU ISP

Kessler Cascade

Last Mile Legal Expenses Letter of Credit Limited-Tax General Obligation Pledge Loan LOC Local Coordination Low-Cost Broadband Service Option

Make Ready Work Match Funding Matching Funds for BEAD Grants MDU Challenge Module Mezz Debt Middle Mile Millimeter Wave Mission-Critical Ruggedization Mobile Monitoring, Reporting and Performance Management Multi-Dwelling Unit Multi-Modal Network Multi-Modality Muni Bond

Native American Native Entity Net Working Capital Network Node Nielsen’s Law of Internet Bandwidth NOFO NTIA

OLT ONT Outside Plant

Packet Loss Peering and Transit Agreements Performance Bonds for BEAD Grants Physical Layer Attack Ping Point to Point PPP Preferred Equity Private Activity Bonds Project Finance

RDOF ReConnect RECs Reliability Reliable Broadband Service Request for Initial Planning Funds Resilient Digital Infrastructure Revenue Bond Revolver Rural Utility Service

SAFE Satellite Internet Secondary Addresses Secured Debt Security Senior Debt Shareholders’ Equity Speed Speed Test Module State Strategic (High Altitude) EMP Subgrantee Subgrantee Selection Subordinated Debenture Subsidiarity Symmetric

Tactical (Close Range) EMP Take Rate Tax-Exempt Debt Taxable Debt Telecommunications Act of 1996 The Good. The BEAD. The Ugly.Three-Legged Stool ModelTier 1, 2, 3 Tribal Broadband Connectivity Program Tribal Data Sovereignty Tribal Government Tribal Land Trust Land

Underserved Underserved Service Project Universal Service Fund Unlevered Returns Unlimited-Tax General Obligation Pledge Unsecured Debt Unserved community Unserved Service Project Upload and download USS Utility

Wi-Fi Wi-Fi Router Wireless

YOC