Microsoft KB Archive/93019

= No Drop Cables Allowed from Thin Ethernet T-Connector to NIC =

Article ID: 93019

Article Last Modified on 10/13/2003

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APPLIES TO


 * Microsoft Windows for Workgroups 3.1
 * Microsoft Windows for Workgroups 3.11

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This article was previously published under Q93019



SUMMARY
The following configuration is not supported by 802.3 10BASE2 (Thin Ethernet) cable:    tT RG58/u (Main Cable)-Tt |           |     |<---RG58/u (Drop Cable) | |           |    NIC               NIC

Key

t = terminator

T = T-connector

NIC = network interface card

The additional drop cable depicted in the above diagram should not be used. The T-connector should be connected directly to the network interface card.



MORE INFORMATION
Because Thin Ethernet network interface cards are not impedance matched, some of the signal coming off the main cable reflects off the network interface card and back on to the main cable.

If the distance is short (less than one to two inches), the echo lands right on top of the main signal and no distortion occurs.

If the distance is long (more than one to two inches), the time taken for the signal to travel down the drop cable, bounce off the card, and come back, is significant and can make the echo land on top of the next pulse, which can result in scrambled signals.

Additional query words: 3.10

Keywords: KB93019

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