The REA-1 transposition system

The R1 transposition system (sometimes coded R1-5) has been employed in many cases for transposing rural open-wire telephone lines. These have been both subscriber lines and trunk lines, voice and carrier. The R1 system has the attractiveness of: 1. Patterns lending themselves to simplicity in engineering and construction. 2. No transposition “sections” or “S” poles. 3. No quantitative limits on sag or span length deviations. 4. Up to 5 pairs per crossarm and up to 4 crossarms.