Connecting IP Devices to an IP Network
34 ECLYPSE User Guide
About the Integrated Ethernet Switch
The 2-port wired interface uses a switch to forward packets addressed to downstream IP
devices connected to it. This allows controllers to be daisy-chained together to extend the IP
network’s physical range and to reduce the amount of network cable required as each
controller no longer has to make a home run to the network switch.
Cat 5e Cable
To Next IP Device
To Other IP Devices
Wired Router / Switch
Daisy-Chained BACnet/IP Controllers 328ft (100m) Maximum
Figure 5-2: Wired Network Connection: Daisy-Chained ECLYPSE Controllers
Fail-Safe Ethernet (ECY-VAV Model Only)
To support fail-safe Ethernet, the onboard switch on the ECY-VAV model has a bypass
capability that links inbound and outbound network segments together when there is an
internal disruption (power is lost, for example). Under normal operating conditions, the
onboard switch regenerates the electrical signal when it forwards the IP packet to the next
device. For this reason, the maximum Cat 5e cable length between IP devices is 328 ft. (100
m).
When there is a failure and the switch is being bypassed, the network segments on both
sides of the controller are directly connected together; however the same length limit applies.
This means that the total maximum Cat 5e cable length between one functional switch and
the next functional switch cannot exceed 328 ft. (100 m). Therefore, it is recommended that
the cable length between controllers be no more than 50m so that if ever one device fails the
total cable length between both working devices is less than 328 ft. (100 m) as shown in the
following diagram:
Cat 5e Cable
To Next IP Device
To Other IP Devices
Wired Router / Switch
Daisy-Chained BACnet/IP Controllers
Com Fail
328ft (100m) Maximum
<164ft (50m)
<164ft (50m)
Figure 5-3: Wired Network Connection: Daisy-Chained ECY-VAV Controllers with
Fail-Safe Ethernet Support
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