IEC 60512-29-100:2015
[Current]
Connectors for electronic equipment - Tests and measurements - Part 29-100: Signal integrity tests up to 500 MHz on M12 style connectors - Tests 29a to 29g
...Thereafter, the return loss of
the reference loads for calibration shall be measured...
...ss shall be >46 dB
Balun port description
A
B C
D
A-B: 100 balanced
C: 50 common-mode
D: 50 unbalanced
A
B C
D
A
B
D
C
Insertion loss (2 units back-to-back)
50 50
Return loss (50:100 )
A
B C
D
50
Return loss (100:50 )
A...
...1 Differential mode
Differential mode plus common mode (DMCM) terminations, as shown in Figure 5 on the left,
shall be used on all active pairs under test, except when measuring return loss, where DM
only resistor terminations are recommended...
