DM9081FP View Datasheet(PDF) - Davicom Semiconductor, Inc.

Part Name

Description

Manufacturer

DM9081FP

10 BASE-T hub controller

Davicom Semiconductor, Inc. 

DM9081

10BASE-T Hub Controller

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-F02

February 02, 2001

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