B. Network Components and Cabling
52
Each node or component on the network segment connects by a point-to-point cable
with a male BNC connector on each end. The male BNC connector on one end of the
point-to-point cable screws into one side of the T connector on the ZT 8995-D2. The
other male BNC connector screws into the next Ethernet component down the segment
line. That component may be another ZT 8995-D2, another compatible Thin Ethernet
node, or a repeater.
RG58 A/U
Point-to-Point
Coax Cable
50 Ohm
Terminator
ZT 8995
or Compatible
Node
"T"
Connector
ZT8995
Thin Ethernet Cable Segment
Standard and Extended Length Segments
The ZT 8995 supports two different types of segment lengths: standard length (SL)
segments, which conform to the IEEE specification, and extended length (EL)
segments, which are not an IEEE conformity. EL segments can be used only if all of the
Ethernet cards and repeaters on the network are capable of operation in the extended
length mode. The ZT 8995 can be programmed with AUTOSET8 to use the longer
segment length. No jumper changes are required to set the ZT 8995 for SL or EL
segment usage. The SL maximum length-per-segment is 185 meters (600 feet), and the
EL maximum length-per-segment is 300 meters (1000 feet).
Each SL segment can have a maximum of 30 nodes while EL segments will support up
to 100 nodes, less one node for each repeater that may be connected. The minimum
distance between nodes is 0.5 meters (20 inches) for either SL or EL segments. See
the "
Thin Ethernet/Cheapernet
" table in Appendix C for additional specifications.
Thin Ethernet Repeaters
A commercially available repeater can connect several network segments together or
provide connection to a Thick Ethernet trunk. The repeater retimes and retransmits
signals as they pass from one segment of the network to another. Repeaters are
available with a single port to connect two segments together, or with multiple ports to
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