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D-Link (Europe) Ltd. D-Link House 6 Garland Road Stanmore London HA7 1DP U.K. Tel: +44-(0)181-2355555 Fax: +44-(0)181-2355500
TECHNICAL BULLETIN
DE-855 MEDIA CONVERTOR Configuration guidelines
The DE-855 media convertor can be used for 10Mbps media conversion between UTP and BNC. It comes with its own external power supply. Please note the following:• Never leave the BNC end of the DE-855 open (unterminated) attached to the UTP cable and make sure it is in a secure position. This may cause serious problems on the network since the DE-855 is not a technically a repeater; so it cannot partition and may send out jam packets across the network. • If you connect from DE-855 to Hub by UTP cable, you don't need to change the pin assignment of wire. If you connect the DE-855 to a network interface card by UTP cable you must cross over one cable end. (see fig 1 & fig 2 on the next page). You can check if the UTP cable link is correct by checking if the link LED is active on both the DE-855 & the network card. • If the Link LED is not lit then there is a definite fault [probably cable].
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• Fig 1: Standard pinouts: Straight through connection DE-855 to hub [protruding plastic clip facing you] Pin
RJ45 connector
Data Cable
RJ45 connector
1 2 3 4 5 6 7 8
TX+ TXRD+
Pin 1 Pin 2 Pin 3
Pin 1 Pin 2 Pin 3
RD-
Pin 6
Pin 6
Fig 2: Cascade pinouts: Crossed over at one end, DE-855 to PC [protruding plastic clip facing you] Pin
RJ45 connector
Data Cable
RJ45 connector
1 2 3 4 5 6 7 8
TX+ TXRD+
Pin 1 Pin 2 Pin 3
Pin 3 Pin 6 Pin 1
RD-
Pin 6
Pin 2
Copyright D-Link Europe Technical Support All trademarks acknowledged Page 2
