User manual

Installing a Liebert iCOM Unit-to-Unit Network
45
5.2 U2U Hardware: Cables and Network Switch
Plan wiring runs for U2U communication when designing the layout of your conditioned space. In
addition to general good wiring practices, take into account:
• Ethernet CAT5 or greater cable is required for interconnecting the units.
• Maximum distance must not exceed 328 feet (100m).
• A device to boost the Ethernet signal may be used to exceed the 328 feet (100m) length limitation.
• Ethernet network should be private—set up only for management and control of the cooling units.
• Keep control and communication cables away from power cables to prevent electromagnetic inter-
ference.
• Do not bend cables to less than four times the diameter of the cable.
• Do not deform cables when securing in bundles or when hanging them.
• Keep cables away from devices that can introduce noise into them, such as machines, fluorescent
lights, and electronics.
• Avoid stretching Ethernet cables—tension when pulling cables should not exceed 25 pounds
(11kg).
• Do not secure Ethernet cables with any method that might damage them; use approved hangers,
such as telephone wire/RG-6 coaxial wire hangers, available at most hardware stores.
Minimum Network Switch Requirements
• IEEE 802.3; IEEE 802.3u
• 10/100 Mbps speed
• Multiple 10/100 RJ-45 ports—one shared; RJ-45 Uplink port
The Liebert vNSA
™
is an approved powered network switch designed to support Liebert iCOM U2U
networks. See Liebert vNSA on page 50 for details.