Tempest Engineering

[for inter-box data-transfer meeting crypto-TEMPEST EMI-minimization]

Shielded twisted tri-par is magnetically-coupled three-conductor constant-current triature (spatial tri-phase) signalling-wire:

it's advantages include:
• single-toroid (ferrite bead) EMP-blocking;
• mechanically-controlled co-length for minimal group-delay, maximum signal-frequency - being approximately the inter-wire radius: typically 1mm 200GHz in 1.6 I/R (cf twisted-pair greater inter-wire distance and less-uniform long-lay cable-lengths 10mm reduces to 20GHz in 1.6 I/R);
• more uniform cable-bending than twisted-pair;
• more uniform conduit-bending than pairs-of-twisted-pairs;
• combined clock-and-data in single cable minimizes clock/data discrimination via electromagnetic probing - one and only one triphase-transition ±120° occurs at every clock 001↔010↔100↔001;
• information is encoded as spatial-phase polarity-rotation virtually undetectable outside the cable shield (which helps confine and redistribute E-M twitches);
• thrives in optimal-low-pass-filter maximal-phase-distortion (e.g. the '...010101101010...'-transition half-bit group-phase-slam is centered in its full-bit-radius);
• optimal conductor-density (4-conductor cross-section is not as tight per-conductor as 3-conductor);
• 67% of the mass-redundancy and cost of paired twisted-pairs (3-conductor + 1-shield vs. 2x2-conductors + 2-shields);
• uniform inter-pair magnetic-coupling equal to 2-conductor twisted-pair (cf 4-conductor is not as tight);
• 33% longer conductor MTBFailure than paired twisted-pairs;
• 33% greater signal-phase separation than 4-conductor (120° vs. 90°);
• potentially 60° digital-6-phase 001↔0½½↔010↔½½0↔100↔½0½↔001, (excluding toroid-blocked 000↔111, albeit 0½½-type are half-current-pairs, or negative-rebalanced);
• potentially allowing 2-conductor-paired feedback (e.g. 100/001-to-010 clocks 010-to-110/011 feedback).

Note fiber-optics has less magnetic coupling but greater optical coupling which lasts longer, the duration of the fireball, and is similarly more susceptible to laser-light penetration-interference. The joints of fiber-optics must be very-high-precision manufactured to maintain coupling I/R index-of-refraction; and nano-crazing directly interferes with photons. Fiberoptic technology is yet new and little development of photon-color has been tried; meanwhile, little induced-lasering has been researched; neutron-pumping of fiber-glass is an infancy-art ... and better to let the infant grow-up in a science-conducive environment, than send it immediately to the TEMPEST front: it's ultimate utility may be found in fiber-optic-web/nets interconnecting tens of thousands of microprocess-control elements, as in adaptable-wing devices, and single-photon-encryption media-complexes ... since these require more circuitous service-looping, and photon-packet-switching,- and can be cost-and-mass-effective.

* ['tri-par'ed 3-paired 3-near 3-adjacent 3-twisted 'thristed' 3-conductor (cf 'twisted'; cf three:two::thrice:twice::thrin:twin)]

* [cf DC-OQPSK, OQTK offset-quadrature-transition-keying in dual-shielded twisted-pair, was application-invented by RKPetry ca 1978-79, Linkabit CORP Engineer #37, for minimal-EMI emission on optimally-/heavily-filter-damped interbox-cabling, with full-bit-radius clocking (00↔01↔11↔00) at high signal-bit-rates on TEMPEST Crypto processor equipment installations for USA SAC-CP and USN UHF-Follow-On military systems contracts: It was precursor similar to the decades-later IEEE 1394 "FireWire" which particularly defined a data control format and connectors... DC-TPSK or TTK in shielded Tri-Par is hereïn a subsequent and further improvement]

A premise discovery under the title,