fido2100 3-Port Industrial Ethernet DLR Switch with IEEE1588
Data Sheet
April 10, 2013
The pass-through of traffic is handled swiftly by using cut through forwarding to pass traffic to the
other external port. This is accomplished without host CPU intervention, which keeps throughput time
host interaction to a minimum and keeps pass through delay to a minimum.
The fido2100 also has the ability to operate in a DLR configuration, which provides media redundancy
amongst its members. Host CPU source code is available to provide the ability for the device to be a
DLR participant or a DLR supervisor using the DLR support functions. The fido2100 will default to
linear topology operation, and when inserted into a ring, will automatically change to DLR operation as
a DLR participant.
1.1 Introduction to Device Level Ring Protocol
There are a variety of Industrial applications in which Ethernet ring topologies are preferable to the star
topologies common in enterprise networks. Ring networks provide inherent single-point fault tolerance
and reduced connectivity costs. Device Level Ring (DLR) protocol provides a means for detecting,
managing and recovering from faults in a ring-based network.
DLR supports three classes of devices:
1 Ring Supervisor – Ring Supervisors are required to send and process DLR beacon frames at the
default beacon interval.
2 Ring Node, Beacon-based – These devices are required to process beacon frames.
3 Ring Node, Announce-based – These devices are not required to process DLR beacon frames,
but must be capable of processing announce frames.
A DLR network consists of a Ring Supervisor and any number of Ring Nodes. Ring nodes incorporate
fido2100 technology with at least two external ports. The Ring Supervisor is responsible for generating
a “beacon” at regular intervals. These beacons traverse the ring in each direction. The ring supervisor
must be capable of blocking DLR frames to avoid infinite propagation of beacons. Faults are detected
when beacon traffic is interrupted. There are obviously a number of failure mechanisms and associated
recovery strategies. For a detailed explanation of DLR refer to ODVA documentation - Volume II:
EtherNet/IP Adaptation of CIP, chapter 9, section 9-5. For definition of the DLR EtherNet/IP object,
refer to Volume II: EtherNet/IP Adaptation of CIP, chapter 5, section 5-5.
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