K2L MOST150, User Manual, Page: 9 / 24

MOST150 E-O Converter
© 2015 - 2017 K2L GmbH & Co. KG 9 DS60001342C
K2L - USER’S GUIDE
Chapter 2 Introduction
In order to validate electromagnetic compatibility (EMC) and conduct operational electrostatic
discharge (ESD) tests for MOST devices, it is necessary to isolate the device under test (DUT) from
other nodes within the MOST network (see
Figure 2.1 ). Isolation involves eliminating the influence of
the other nodes as well as external environmental factors from the DUT. In the case of EMC testing,
environmental isolation is achieved through the use of an anechoic chamber, which is a shielded room
that is designed to attenuate environmental noise sources. For operational ESD testing, the transient
voltages induced on the electrical cPHY network need to be confined to the DUT. This is accomplished
by electrically isolating the DUT’s electrical cPHY network from the other MOST devices.
K2L developed an easy to use product that fulfills all the requirements mentioned above: the MOST150
E-O Converter Kit. It assists in isolating the DUT during a functional network test by converting a
MOST network (data rate: 150 Mbit/s, electrical cPHY layer) into an optical physical layer network
interface.
Figure 2.2 shows how this is achieved by using two MOST150 E-O Converter devices. One
MOST150 E-O Converter is connected electrically to the MOST network devices outside of the test
environment (this MOST150 E-O Converter is connected to a power supply and automatically charges
the rechargeable batteries that are assembled inside) while the other MOST150 E-O Converter is
connected electrically to the MOST network (data rate: 150 Mbit/s, electrical cPHY layer) DUT inside
of the test environment (this one operates with batteries inside the chamber). The network is completed
when an optical connection is made between the two MOST150 E-O Converters.
Figure 2.1 MOST Network Implementation