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Appendix B: Cable Limits
B.1 Network/Cable Limits
Thinwire (10BASE2) segments can be no longer than 185 m (600 ft.), and
can have taps no closer together than 0.5 m (1.5 ft.) apart. These can be
no more than 30 taps per segment.
Thickwire segments can be no longer than 500 m (1650 ft.). Taps must
be increments of 2.5 m (8 ft.) apart. There can be no more than 100 taps
per segment.
10BASE-T segments can be no longer than 100 m (330 ft.). Longer
segments may work in some instances, but we do not recommend them.
Cable is phone grade (or better) unshielded twisted-pair (UTP) cable, RJ-45
connectors.
AUI cables can be no longer than 50 m (165 ft.).
For all media types, a total of 4 repeaters are allowed between any two
nodes connected by 5 segments of cable. A maximum of 3 segments between
any two nodes can have taps on them—the others must be point-to-point links
(10BASE-T or fiber). For example, if you use 5 segments to go across 4
repeaters between 2 nodes, 2 of the segments (5-3=2) must have NO taps.
B.2 Serial Cables
The EPS complies to the RS-423 specification. If you connect the EPS to an
RS-232 device, it is subject to the RS-232 limits shown below. If you connect
the EPS to an RS-422 device, it is subject to the RS-422 limitations.
• RS-232 lines are limited to 15 m (50 ft.) in length.
• RS-422 lines are limited to 300 m (1000 ft.).
B.3 Parallel Cables
Parallel cables (Centronics or Dataproducts) can be no longer than
6.1 m (20 ft.).
All parallel cables must be internally twisted (each signal with its return
signal) for the interfaces to function properly. If you don’t follow this rule,
the EPS may lose data.