Connecting Otmc 100 To An Ethernet Network - Omicron Lab OTMC 100 Quick Start Manual

OTMC 100 Quick Start Guide
4 Connecting 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, 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
OTMC 100. The locking tab of such connectors cannot be accessed directly anymore after
inserting the plug to 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
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
OTMC 100.
OTMC 100 is supplied with power by Power over Ethernet (PoE) according to IEEE 802.3af. If the
network port OTMC 100 is connected to does not provide PoE, a PoE injector has to be used as
shown in the figure below.
OTMC 100 supports Ethernet cable lengths of up to 100 m without the need of repeaters.
OTMC 100 automatically powers up after inserting the RJ45 plug and providing supply voltage to
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.
OTMC 100 is a class 1 powered device (PD) as defined in IEEE 802.3af (power
consumption < 3.84 W). The network port 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.
12 OMICRON