6 Functional Description of the Ethernet Modules
6-38
Two single-color LEDs are provided on the RJ45 connector, indicating the current
communication state. Although these LEDs are not labeled, they can be clearly identi-
fied through their color. The upper, yellow LED indicates the link state, the lower,
green LED indicates that communication is active.
10BaseT Link LED
• OFF No active link. Communication is not possible.
• Yellow static Active link. Communication is possible.
10BaseT Active LED
• Off No communication.
• Green flashing Communicating.
6.7.2 Hardware structure
The 10BaseT module EI 813F comprises the following hardware components:
• LAN controller/coprocessor, adapted to Intel RISC-CPU
32-bit data bus, 32-bit address bus, DMA, interrupt
• Serial interface/Manchester encoder for generating a serial bit stream
• EEPROM for configuration data
• HEX coding switch for configuring IP address / redundancy link
• Electrical isolation for TP interface
• ESD protector on RJ45 socket
• Isolator for electrical isolation of the bus signals
• Buffer battery holder with polarity reversal protection and monitoring circuit
• RJ45 connector
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