ABB Relion REG670, Technical Manual

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21.2.14 Optical ethernet module (OEM)
21.2.14.1 Introduction
The optical fast-ethernet module is used for fast and interference-free communication
of synchrophasor data over IEEE C37.118 and/or IEEE 1344 protocols. It is also used
to connect an IED to the communication buses (like the station bus) that use the IEC
61850-8-1 protocol (port A, B). The module has one or two optical ports with ST
connectors.
21.2.14.2 Functionality
The Optical Ethernet module (OEM) is used when communication systems according
to IEC 61850–8–1 have been implemented.
21.2.14.3 Design
The Optical Ethernet module (OEM) is a PMC card and mounted as a mezzanine card
on the ADM. The OEM is a 100BASE-FXmodule and available as a single channel or
double channel unit.
IEC05000472=1=en=Original.vsd
1
1
2
2
IEC05000472 V3 EN
Figure 539: OEM layout, standard PMC format 2 channels
• 1: Transmitter
• 2: Receiver
1MRK502052-UEN B
Section 21
IED hardware
1189
Technical manual