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ICDM-RX/TCP Installation and Configuration Guide
Daisy-Chaining ICDM-RX/TCP With Dual Ethernet Ports
11.6. Daisy-Chaining ICDM-RX/TCP With Dual Ethernet Ports
The ICDM-RX/TCP models with dual Ethernet ports follow the IEEE specifications for standard Ethernet 10/
100BASE-TX topologies.
When using the E1 and E2 ports, the ICDM-RX/TCP is classified as a switch. When using the UP port only, it is
a simple end node device.
The maximum number of daisy-chained ICDM-RX/TCP units, and the maximum distance between units is
based on the Ethernet standards and will be determined by your own environment and the conformity of your
network to these standards.
Pepperl+Fuchs has tested with seven ICDM-RX/TCP units daisy-chained together using 10 foot CAT5 cables,
but this is not the theoretical limit. You may experience a performance hit on the devices at the end of the chain,
so it is recommended that you overload and test for performance in your environment. The OS and the
application may also limit the total number of ports that may be installed.
Following are some quick guidelines and URLs of additional information. Note that standards and URLs do
occasionally change.
•
Ethernet 10BASE-T Rules
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The maximum number of repeater hops is four.
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You can use Category 3 or 5 twisted-pair 10BASE-T cables.
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The maximum length of each cable is 100m (328ft).
Note: Category 3 or 5 twisted pair cables look the same as telephone cables but they are not the
same. The network will not work if telephone cables are used to connect the equipment.
•
Fast Ethernet 100BASE-TX rules
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The maximum number of repeater hops is two (for a Class II hub). A Class II hub can be connected
directly to one other Class II Fast Ethernet hub. A Class I hub cannot be connected directly to another
Fast Ethernet hub.
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You must use Category 5 twisted-pair 100BASE-TX cables.
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The maximum length of each twisted-pair cable is 100m (328ft).
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The total length of twisted-pair cabling (across directly connected hubs) must not exceed 205m (672ft).
Note: Category 5 twisted pair cables look the same as telephone cables but they are not the same.
The network will not work if telephone cables are used to connect the equipment.
•
IEEE 802.3 specification: A network using repeaters between communicating stations (PCs) is subject to
the 5-4-3 rule of repeater placement on the network:
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Five segments connected on the network.
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Four repeaters.
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Three segments of the 5 segments can have stations connected. The other two segments must be
inter-repeater link segments with no stations connected.
Additional information may be found by searching the web.
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Troubleshooting
