Rj-45 Connectors; The Hub; The Switch - Johnson Controls FRICK QUANTUM LX AcuAir Communications Manual

090.510-CS (DEC 2012)
Page 8
transformers, solenoids, lighting,
etc.)
• Label the ends of each cable, to fa-
cility troubleshooting and identify-
ing in the future.
• Test each individual cable run with
an approved CAT5 E cable tester. A
TONING alone test is NOT accept-
able.
• Use rubber grommets anywhere
that the cable enters through a
hole in a metal panel.
• ALWAYS obey local, national and
fire building codes.
Don't:
• Don't install cable taut, cables
must always have some "play" or
slack in them.
• Don't over-tighten cable ties.
• Don't splice a cable. If a break
occurs, or the length is not long
enough (under 300 feet), replace
the entire run with an intact length.
• Don't tie cables to electrical con-
duits.
• Don't strip more than one inch
from the end of each cable when
installing end connectors.
• Don't sharply bend or kink the ca-
ble.
• Don't mix 568A and 568B wiring at
the same installation. 568B is the
most common wiring.
• Don't use excessive force when
pulling cable.

RJ-45 CONNECTORS

Ethernet network cables require the use of
industry standard RJ-45 plugs as shown be-
low, for the termination of all cables:
Typical RJ-45 Connector

THE HUB

A Hub is a common connection point for de-
vices in a network. Hubs are commonly used
to connect segments of a LAN (Local Area
Network). They also contain multiple ports.
When a data packet arrives at one port, it
is copied to the other ports so that all seg-
ments of the LAN can see all packets.

THE SWITCH

Network Switches look nearly identical to
QUANTUM™ LX AcuAir™ CONTROL PANEL
COMMUNICATIONS SETUP
hubs, but a switch generally contains more
intelligence than a hub. Unlike hubs, net-
work switches are capable of inspecting
the data packets as they are received, de-
termining the source and destination device
of a packet, and forwarding that packet ap-
propriately. By delivering messages only to
the connected device that it was intended
for, network switches conserve network
bandwidth and offer generally better per-
formance than hubs.
The Switch takes the signal from each com-
puter/Quantum™ LX and sends it to all of
the other computers/LX panels in your plant
or office. Switches come in several sizes,
noted by the number of ports available -- a
four-port Switch can connect four comput-
ers, an eight-port Switch can connect up to
eight computers and so on. So, if you start
with a four-port Switch but eventually add
more panels, you can buy another Switch
and connect it to the one you already have,
increasing the potential number of panels
on your network.
Typical Switch
Note: If you want to connect one computer to
one Quantum™ LX, you can avoid the switch and
use a crossover Cat 5 cable. With a crossover
cable, you directly connect one Ethernet device
to the other without a Switch. To connect more
than two you need a Switch.
Refer to the following pictorial to construct a
crossover cable:
1 2 3 4 5 6 7 8
Left (Not
Crossed)
Both Ends of a crossover-cable
3 6 1 4 5 2 7 8
Right (Crossed)