Rj interfaces, Rj pinouts, Building rj45/rj11 loopback plugs – Comtrol ISA User Manual
Page 6: Setting the dip switches, Sample dip switch settings, 140 - 183 hex, 180 - 1c3 hex, 240 - 283 hex, 280 - 2c3 hex, 340 - 383 hex
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