S1 dip-switch selection of dte speed, S2 dip-switch leased line mode selection, S4 dip-switch v.23 line modulation – Westermo TD-36 User Manual
Page 26: S1 dip-switch selection of dte-format, S2 dip-switch leased line 2/4-wire selection, S4 dip-switch permanent carrier control
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