V.23 2- / 4-wire hdx- / fdx-leased line settings, S1 dip-switch selection of dte speed, S2 dip-switch leased line mode selection – Westermo TR-36 User Manual

Page 20: S3 dip-switch v.23 line modulation, S1 dip-switch selection of dte-format, S2 dip-switch leased line 2/4-wire selection, S4 dip-switch permanent carrier control