DM9081 查看數據表（PDF） - Unspecified

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DM9081

10BASE-T Hub Controller

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DM9081

DM9081 Chip External Components

Figure 5 shows a typical twisted pair port external

components schematic diagram. The resistor used should

have a 1% tolerance to ensure compliance with 10BASE-T

networks. The filters and pulse transformers are necessary

devices that have a major impact on the performance and

compliance of the 10BASE-T repeater ports. Specifically,

the transmitted waveforms are heavily influenced by the

filter characteristics, and the twisted pair receivers employ

several criteria to continuously monitor the incoming

signals' amplitude and timing characteristics to determine

the necessity and the time to assert the internal carrier

sense. For these reasons, it is crucial that the values of the

resistors and the tolerances of the external components

comply with given specifications. Several manufacturers

produce modules that combine the functions of the

transmit filters, receive filters, and pulse transformers into

one package.

Figure 5. Typical Single TP Port Using External Components

Figure 6. Typical Single AUI Port Using Components

12

Final

Version: DM9081-DS-F01

April 22, 1997

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