Ethernet Communications Modules, 3rd Edition, Rev. D
2–14
Chapter 2: Setup and Installation
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10/100BaseT Connections
Most 10/100BaseT hubs or repeaters use a patch (straight-through) cable for connecting the
network devices (PLCs or PCs). For hub-to-hub connections a crossover type cable is commonly
required. The figures on the previous page show pin assignments and insulation color codes for
patch (straight-through) and crossover type Ethernet cables.
UTP Cable
The ECOM has an eight-pin modular port that accepts RJ45 type connectors. UTP (Unshielded
Twisted-Pair) cable is rated according to its data-carrying ability (bandwidth) and is given a
“category” number. We strongly recommend using a category 5 cable for all ECOM connections.
NOTE:
See page 2-14 for 10/100BaseT cable distance limitations.
10BaseFL Connections
Each module has two bayonet ST-style connectors. The ST-style connector uses a quick
release coupling which requires a quarter turn to engage or disengage. The connectors provide
mechanical and optical alignment of fibers.
Each cable segment requires two strands of fiber: one to transmit data and one to receive data.
The ST-style connectors are used to connect the H2-ECOM-F or H4-ECOM-F module to
another H2-ECOM-F or H4-ECOM-F module or a fiber optic hub or repeater.
Fiber Optic Cable
The H2-ECOM-F and H4-ECOM-F modules accept 62.5/125 multimode fiber optic (MMF)
cable. The glass core diameter is 62.5 micrometers and the glass cladding is 125 micrometers.
The fiber optic cable is highly immune to noise and permits communications over much greater
distances than 10BaseT.
Fiber Optic Module ST Connector
NOTE:
See page 2-14 for 10BaseFL distance limitations
Transmit
Receive
Ferrule
62.5/125 MMF cable with
bayonet ST-style connectors
Core
Cladding
Sheathing
Transmit
Transmit
Receive
Receive
Connecting Two
Fiber Optic ECOMs
Multimode Fiber Optic (MMF) Cable
Fiber Cross-section
