Ground Mobile Forces

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'Ground Mobile Forces (GMF) refers to the tactical satellite communications (SATCOM) component of the Tri-Service Tactical (TRI-TAC) program.[1] Developed by GTE-Sylvania in the mid-1970s, TRI-TAC was a joint-service military command, control, and communications initiative.[1] The program aimed to field advanced multichannel switched equipment, eliminate redundant acquisitions across military branches, and establish seamless interoperability between tactical and strategic communications systems.[1]

## Contents

* 1 Architecture and technical specifications
* 1.1 Terminal classifications
* 1.2 Data capacities and throughput
* 1.3 Radio frequency and environmental protection
* 2 Obsolescence and legacy
* 3 See also
* 4 References
* 5 Further reading

## Architecture and technical specifications

GMF systems operate in a hub-and-spoke network topology.[1] In this configuration, a central hub terminal can simultaneously ingest up to four primary data feeds from outlying spoke terminals.[1]

### Terminal classifications

The system utilizes four primary designated SATCOM terminals categorized by their operational role:

* Hub Terminals (AN/TSC-85B and AN/TSC-100A): Equipped for point-to-point and hub operations.[1]
* Spoke Terminals (AN/TSC-93B and AN/TSC-94A): Designated remote terminals that connect directly back to a hub.[1]

### Data capacities and throughput

* Hub Performance: Standard hub configurations ingest up to 48 multiplexed, encrypted channels from a maximum of four spoke terminals simultaneously.[1] Utilizing an external multiplexer doubles this capacity to 96 channels.[1]
* Channel Configuration: Channels operate at 16 kbit/s or 32 kbit/s, translating to an effective true capacity of 48 kbit/s when accounting for protocol overhead.[1]
* Spoke Performance: Outlying terminals support up to 24 multiplexed channels (16/32 kbit/s).[1]

Terminal Type | Designation | Primary Role | Max Capacity (Channels) | Antenna Type

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Hub | AN/TSC-85B / AN/TSC-100A | Point-to-Point / Hub | 48 (96 with external mux)[1] | 20 ft (6.1 m) QRSAG dish[1]
Spoke | AN/TSC-93B / AN/TSC-94A | Remote Spoke | 24[1] | 8 ft (2.4 m) parabolic dish[1]

### Radio frequency and environmental protection

GMF terminals communicate via Super High Frequency (SHF) X-band through the Defense Satellite Communications System (DSCS) satellite constellation.[1][2]

All GMF terminals feature external interfaces for field telephones, a 70 MHz Intermediate Frequency (IF) wideband input, and connection to an AN/TSQ-111 Tech Control Facility.[1] To support sustained tactical deployments, equipment shelters are sealed for operations in Chemical, Biological, Radiological, and Nuclear (CBRN) environments.[1]

## Obsolescence and legacy

While legacy TRI-TAC and GMF hardware provided foundational field communications for decades, the bulky circuit-switched equipment has largely become obsolete.[1]

Over time, these systems were largely phased out in favor of modern, IP-based fly-away quad-band systems equipped with compact routers, switches, and advanced encryption hardware.[1] Despite their technical obsolescence, select GMF terminals remained active in field operations under severe conditions during military engagements in Iraq and Afghanistan.[1]

## See also

* Defense Satellite Communications System
* AN/TTC-39 Circuit Switch
* Tactical Communications Network

## References

1. ↑ 1.00 1.01 1.02 1.03 1.04 1.05 1.06 1.07 1.08 1.09 1.10 1.11 1.12 1.13 1.14 1.15 1.16 1.17 1.18 1.19 1.20 Ground Mobile Forces, Wikipedia, The Free Encyclopedia.
2. ↑ DSCS-3, GlobalSecurity.org.

## Further reading

* "AN/TTC-39 Technical Manual / Document" (PDF). https://radionerds.com/images/4/4b/TTC-39.pdf.
* Carestio, R.; McLeskey, F.; Coyle, D. (1986-06-16) (in en-us). ﻿An Analysis of Planned Army Ground Mobile Forces (GMF) Satellite Use in Support in Mobile Subscriber Equipment.﻿ (Report). M/A-COM Government Systems, Inc.. https://apps.dtic.mil/sti/pdfs/ADA169469.pdf. Retrieved 2022-08-26.
* Shively, Robert G. (1993-04-15) (in en-us). ﻿Updating The Joint Common User Communications Architecture — A Case For The Army's View﻿. Carlisle Barracks, Pennsylvania. ADA263904. https://apps.dtic.mil/sti/pdfs/ADA263904.pdf. Retrieved 2022-08-24.

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