Variable Message Format (VMF) Training

Commitment 3 days, 7-8 hours a day.
Language English
User Ratings Average User Rating 4.8 See what learners said
Delivery Options Instructor-Led Onsite, Online, and Classroom Live


Currently used mainly by the US, this TDL is emerging as the fastest-growing system in today’s modern armed forces.

The Variable Message Format (VMF) Training course familiarises the delegate with all aspects of current VMF operations. Our highly knowledgeable instructors have based this course around the latest versions of US MIL-STD-188-220, MIL-STD-2045-47001, and MIL-STD-6017 (differences between the different versions will be discussed during the course). The transmission protocols are considered in detail, as are the message headers, structure, and use of the K-Series VMF messages.  Considerations of interoperability are an important feature.

  • 3 days of  Variable Message Format (VMF) Training with an expert instructor
  • Variable Message Format (VMF) Electronic Course Guide
  • Certificate of Completion
  • 100% Satisfaction Guarantee


  • We can adapt this Variable Message Format (VMF) course to your group’s background and work requirements at little to no added cost.
  • If you are familiar with some aspects of this Variable Message Format (VMF) course, we can omit or shorten their discussion.
  • We can adjust the emphasis placed on the various topics or build the Variable Message Format (VMF) around the mix of technologies of interest to you (including technologies other than those included in this outline).
  • If your background is nontechnical, we can exclude the more technical topics, include the topics that may be of special interest to you (e.g., as a manager or policy-maker), and present the Variable Message Format (VMF) course in a manner understandable to lay audiences.

Upon completing this Variable Message Format (VMF) course, learners will be able to meet these objectives:


The target audience for this Variable Message Format (VMF) course:

  • TDL operators
  • TDL certification and testing professionals
  • Engineers and technicians
  • Analysts
  • Other military and defense professionals

The knowledge and skills that a learner must have before attending this Variable Message Format (VMF) course are:

  • N/A


Lesson 1 – Introduction
  • A Short History of VMF
  • System Overview
  • Documents
  • Current and Planned Users
Lesson 2 – Open Systems Interconnection (OSI) 7 Layer Model
  • 7 Layer Model Composition
  • Data Frame Compilation
  • Ethernet Principles
  • System Performance
  • Variable Message Format (VMF) Training
Lesson 3 – MIL-STD-188-220 Frames
  • Frame Content
  • Types of Frame
  • Frame Elements
Lesson 4 – Types of Service
  • Types of Service Description
  • Data Link Acknowledgements
  • Duplicate Detection
  • Window Method
  • Station Classes
Lesson 5 – Network Access Control
  • Network Access Delay (NAD)
  • Probabilistic & Deterministic NAD
  • NAD Types
  • Frequency of Access Ranking
Lesson 6 – Net Joining Procedures
  • Exchange Network Parameters (XNP)
  • XNP Messages
  • Network Controller
  • Static & Dynamic Stations
Lesson 7 – Message & Header Syntax
  • Message Numbering
  • Cases & Conditions
  • Data Field Classification
  • Presence & Recurrence Indicators
Lesson 8 – Application Header (MIL-STD-2045-47001)
  • Application Header Fields
  • Future Use Groups
  • Receipt / Compliance
  • Segmentation Reassembly
  • Interoperability
Lesson 9 – Functional Area Designators (FADs) & K-Series Messages
  • Functional Area Designators
  • VMF K-Series Messages
  • Message Use Scenario
  • Variable Message Format (VMF) Training
Lesson 10 – Unit & Entity Reporting
  • Unit Reference Number (URN)
  • Unit Name (UN)
  • URN Look-Up Table
  • Entity Identity Serial Number (EISN)
  • Entity Identity Reference Number (EIRN)
Lesson 11 – Radios & Modems
  •  VMF Capable Radios & Modems
  • Compliance
Lesson 12 – Inter / Intranet Protocols
  • Internet Protocol (IP)
  • IP Addresses
  • Transmission Control Protocol (TCP)
  • User Data Protocol (UDP)
  • N-Layer Pass-Through
  • Topology Update
  • Intranet Relay
Lesson 13 – Data Forwarding
  •  Message Translation
  • Forwarding – TDL Differences
  • Gateways
Lesson 14 – Network Management (NM)
  •  NM Responsibility
  • Initialization Data
  • VMF NM
  • Management & Test Tools
Lesson 15 – Interoperability (IO)
  • Interoperability Issues
  • DoD Standard Profile Implementation Conformance Statements (DSPICS)
  • Possible Solutions
Lesson 16 – XML-VMF
  • XML Usage
  • XML Schemas
Lesson 17 – Close Air Support
  • CAS Definition
  • Message Implementation
  • CAS Procedures
Variable Message Format (VMF) TrainingVariable Message Format (VMF) Training Course Wrap-Up


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