Constrained Transport
Constrained transport refers to communication channels with severe limitations in bandwidth, latency, availability, or some combination of all three. Examples include satellite burst messaging (Iridium SBD: 340 bytes uplink, variable latency), Globalstar simplex (9 bytes per packet), SMS (160 characters / 140 bytes), acoustic underwater communication (tens of bits per second), and LoRa (variable, typically 51-222 bytes depending on spreading factor). Operating over constrained transports requires fundamentally different protocol design: no session negotiation, no handshaking, no acknowledgment loops, and minimal overhead. Every byte must carry actionable data.
How XO Defense Addresses This
Constrained transport is the primary design constraint of XO Defense's protocol stack. The 25-byte Mustard Envelope was specifically designed to fit within the minimum payload of every transport in the XO Defense matrix — satellite burst, SMS, acoustic relay, LoRa, and BGAN. Rather than adapting existing protocols to work over constrained channels (compression, truncation, fragmentation), XO Defense built protocols that are native to constrained environments. The result is a protocol stack where the minimum-viable transport unit is also the maximum-efficiency data unit.
Learn how XO Defense's 25-byte protocol stack operates in the most constrained environments.
View Protocol Stack →