Simtec 56.5 manual said:CAS (Primary Trigger)
The CAS consists of a toothed disk and an two coils (exciter and modulator). The disk is attached to the crankshaft and
theoretically comprises 59 teeth set around its circumference. At a position 114° BTDC, one tooth is omitted as a reference to
TDC and so a total of 58 teeth remain on the disk. A high frequency signal of between 120 and 180 khz is delivered to the exciter
coil by the ECM.
There you go - even Siemens classifies it as a high frequency