Yaskawa Microtrac LAN ARCNET Active hub - Manual (Page 8)

LAN CABLING RULES AND GUIDELINES
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4/23/97
LAN CABLING RULES AND GUIDELINES
The ARCNET LAN uses RG-62A/U coaxial cable, BELDEN number 9269 or
equivalent (MagneTek Part No. 05P00211-0047). Other cable types will not
work properly.
The LAN cable should be routed with signal level wires only. The LAN cable
may cross power wiring, but only at a 90 degree angle. A LAN cable that runs
parallel to power wiring may pick up noise from that power wiring even if
separated by a space of several inches. It is best to separate signal level wiring
(including the LAN cable) from power wiring (including relay coil wiring) with
a metal divider in a cable tray or by routing the signal wire through its own
metal conduit.
LAN nodes may be connected in any order. Minimum cable length between
nodes is 6 feet, and the minimum bend radius of the cable is 2.5 inches. The
maximum distance from one end of the LAN to the other without the Active
Hub is 900 feet. The ARCNET Active Hub can support a maximum of 900 feet
on each of its 4 ports. A maximum of eight (8) nodes can be connected to each
Active Hub port.
Each LAN node is directly connected to the coaxial cable with a TEE connector
( M a g n e Tek Part No. 05P00034-0540). Both ends of the coaxial cable must be
terminated with a 93 ohm termination (MagneTek Part No. 05P00034-0586).
The ARCNET Active Hub provides its own active termination as long as power
is applied to it. No TEE connector should be used on the Hub ports. The
ARCNET Active Hub must be connected at the end of the coaxial cable. Leave
unused ports open; it is not necessary to terminate them with 93 ohm
t e r m i n a t o r s .
If a node is disconnected at a TEE connector, either replace the TEE connector
using a BNC-BNC splice or (if temporary for diagnostic purposes) leave it open.
Do not add another 93 ohm terminator, as it may overload the signal and destroy
c o m m u n i c a t i o n s .
The outer conductor of the LAN cable must not touch ground. This means that
cable TEE connectors and terminating resistors should not touch a drive chassis
or any other grounded surface. If cable splice connectors are used for wiring
convenience, they must be insulated from metallic conduit or pull boxes.
L A N C A B L I N G
R U L E S A N D
G U I D E L I N E S
RD 90-279 © 1997 MagneTek, Inc. 97-04