The Expanded beam conector / HMA optical modules are designed for connection of the nodes of tactical network by the help of cables with optical fibers. The used „Expanded beam technology“ preserves all advantages of signals transmission through the optical lines in field harsh environmental conditions. 
Benefiting from expanded beam technology, with a long and proven industry track record, the precision optical alignment system creates immunity from water, mud, dust, oil and other contaminants.
The HMA Hermaphroditic coupling eliminates the need for adaptors and male and female mating halves. Hermaphroditic housings allow for rapid deployment, creating low loss Single mode, Multimode and Hybrid daisy chained links in a variety of planforms ranging from simplex fiber to a copper Hybrid. The Expanded beam conector / HMA is ideally suited for environmental extremities where low maintenance and quick repairabilty is necessary, the connectors are uniquely field installable and rapidly field repairable.
There are two different types of HMA connection modules:
a)    LD type military tactical cable with HMA plugs at both sides
b)    Hybrid connection module  HMA to standard fiber optic connectors (FC, SC, ST, LC, …)