Connection, Access & Initial Setup; Connecting The Otmc 100 To An Ethernet Network - Omicron Lab OTMC 100 User Manual

5 Connection, Access & Initial Setup
5.1

Connecting the OTMC 100 to an Ethernet Network

Note regarding network switches:
The precise synchronization of clocks via Ethernet networks requires that the propagation
delay times for data packets is constant on the entire network. Network switches that do not
provide transparent clock functionality may introduce jitter and thus influence the propagation
delay. Therefore, the OTMC 100 will only be able to provide highly accurate time
synchronization in networks that that are equipped with network switches providing
transparent clock functionality as specified in IEEE 1588-2008 or that do not have a network
switch at all.
Do not connect conventional RJ45 connectors that are equipped with a locking tab to the
OTMC 100! The locking tab of such connectors cannot be accessed directly anymore after
inserting the plug to the OTMC 100. In this case, a small screwdriver must be used to
carefully unlock the RJ45 connector in the socket. Use the waterproof RJ45 connector
supplied with the OTMC 100 instead or, when using a cable with a conventional RJ45
connector (for test purposes only!), break off the locking tab at the RJ45 connector before
inserting it to the OTMC 100.
The OTMC 100 is supplied with power by Power over Ethernet (PoE) according to IEEE 802.3af. If the
network port the OTMC 100 is connected to does not provide PoE, a PoE injector has to be used as
shown in the figure below.
The OTMC 100 supports Ethernet cable lengths of up to 100 m without the need of repeaters. By
using additional media converters the use of optical Ethernet is possible, which allows much longer
distances. Depending on the used variant it is possible to cover distances up to 2000 m. For further
details, please refer to the user manual of the media converters used.
The OTMC 100 automatically powers up after inserting the RJ45 plug and providing supply voltage to
the OTMC 100. After the device is supplied with voltage, the LED first lights up red for approx. 15 s
during the boot process and then changes to green to indicate operational readiness.
The OTMC 100 is a class 1 powered device (PD) as defined in IEEE 802.3af (power
consumption < 3.84 W). The network port the OTMC 100 is connected to must be able to
supply a class 1 powered device.
CAUTION! Risk of injury or damage due to high voltages caused by lightning stroke.
The local lightning protection regulations and the protection concept of the building and the
electrical installation may require a suitable surge protection device for the Ethernet network
cable leading into the building.
Connection, Access & Initial Setup
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