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- Miscellaneous notes....Thin ethernet cabling
-
- This document contains some cabling information for thin ethernet
- (10Base2) networks. For more information thin ethernet, contact
- your local network supplier or call the IEEE (800-678-IEEE).
-
- This document (or an updated version) is also available on FaxBACK,
- document #6305.
-
- Thin ethernet is a linear bus topology that uses a COAX cable.
- If their is a break in the cable it will disrupt the entire segment.
-
- 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/u 50 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
- ------------------------------------------------
-
- CABLE LENGTHS
- ---------------------------------------------------------------------
- Max trunk length 185 meters (607 feet)
- Max number of nodes per trunk 30
- Max number of trunks 5 (only 3 can have wkst attached)
- Max length of entire network 925 meters (3035 feet)
- (all trunks added together)
- Min cable length between nodes .5 meters (1 1/2 feet)
- ---------------------------------------------------------------------
-
-
- Each node is connected to the cable using a T-connector.
- - Do not 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 3 of these segments can have workstations attached. Repeaters
- count as a workstation so 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