RJ45 or M12?

RJ45 or M12?

RJ45 plug connectors, which conform to the IEC 60603-7 standard, are the most widely established connection technology for Ethernet systems. These eight-pin components are widely used and are available for both Cat5 and Cat6 (IEC 11801:2002).

For Ethernet networks that must comply with protection class IP67, M12 plug connectors represent an attractive alternative to RJ45 and are frequently more suitable.

he M12 four-pin plug connector with D-coding has already been defined as an Industrial Ethernet standard according to IEC 61067-2-101 . PNO also supports the use of this connector type and has included it within its PROFINET cabling specifications alongside the RJ45 push-pull connector. M12 connection technology is well established in sensor-actuator and fieldbus cabling and provides several advantages in industrial environments.

Even though they are IP67-compliant, M12 connectors have a compact design. In keeping with the growing trend toward miniaturization, this makes them particularly attractive to equipment manufacturers that develop small-scale products. M12 connectors are very sturdy despite their small size, and they provide a reliable connection even when subjected to shock or vibration.

However, not every M12 connector is suitable for Ethernet systems. Ethernet transmission has to comply with Cat5 (IEC 11801:2002), and the contact geometry of standard M12 connectors is only partially compatible with this. Connection mechanisms such as spring cages, for example, may cause an electrical imbalance and so adversely affect transmission properties such as return loss. In order to ensure full Cat5 compliance, it is necessary to compensate these negative side effects. Properly designed Industrial Ethernet M12 components are specifically designed to overcome this kind of shortcoming and so consequently provide faultless transmission.

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