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EtherExpress™ Adapter
10Base2 Cable Information (Thin Ethernet)

Thin Ethernet Cable Notes

This document contains cabling and installation recommendations. For more information on thin Ethernet cabling, contact your local network supplier or call the IEEE at 800-678-IEEE.

The EtherExpress™ adapters have a cylindrical, bayonet BNC connector.

BNC cabling is also known as thin Ethernet, RG-58A/U, Cheapernet, and 10BASE-2.

Recommended Cables

Here is a list of IEEE approved and non-approved cables.

Approved cable types
802.3 10Base2 50 ohms, stranded tinned core
RG-58 a/u50 ohms, stranded tinned core
RG-58 c/u 50 ohms, stranded tinned core

NON-Approved cable types
RG-58 50 ohms, solid center core
RG-58 u 50 ohms, solid center core

Installation recommendations

Thin Ethernet is a linear bus toplogy that uses a coax cable. A break in tcable will disrupt the entire segment.

Each node is connected to the cable using a T-connector.

  • Don't connect the end of the cable directly to the BNC connector on the EtherExpress card.

  • Do not use cable drops or external transceivers unless you are using the AUI connector instead of the BNC connector.

Both ends of a trunk must be terminated with 50 ohm terminators. One end should be grounded.

Up to 5 trunk segments may be connected (through repeaters), but only three of these segments can have workstations attached. Repeaters count as a workstation. If you have two repeaters on a segment, then the maximum number of user workstations is 28.

Example:

	                   no workstations           no workstations
	                          |                          |
	                          v                          v
	    |--+------+ +--------+ +-----+------+ +--------+ +----+----|
	       |      | |        | |     |      | |        | |    |
	       |    repeater   repeater  |   repeater   repeater  |
	       |                         |                        |
	   workstation               workstation            workstation
	      1-29                      1-28                   1-29
	
Cable Lengths
Max trunk length 185 meters (607 feet)
Max number of nodes per trunk30
Max number of trunks5 (only 3 can have wkst attached)
Max length of entire network925 meters (3035 feet
(all trunks added together)
.5 meters (1 1/2 feet)

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