BusWorks
®
900EN-S005 Ethernet Switch User’s Manual Ethernet I/O
__________________________________________________________________
_______________________________________________________________________________________
Acromag, Inc. Tel:248-624-1541 Fax:248-624-9234 Email:
http://www.acromag.com
8
7
6
4
3
1
1
8
5
2
1
8
PIN
CLIP
8
10Base-T
100Base-T
100M
100M
CAT 5 UTP/STP
Not Used
Transmit -
Not Used
Tr
R
MDI-X WIRING
RJ-45 CONNECTOR
SPEED
CABLE
Not Used
DISTANCE
Not Used
Receive -
CAT 3, CAT 4, or CAT 5 UTP/STP
Note Crossover Connections
MINIMUM RECOMMENDED CABLE
Not Used
Receive -
Not Used
R
Tr
ETHERNET PORT
MDI WIRING
Not Used
Not Used
Transmit -
RJ45 MDI AND MDI-X CONNECTIONS
2
6
3
1
1
8
1
8
3
6
2
1
8
1
8
PINS:
1
1 TO 3
2 TO 6
3 TO 1
6 TO 2
RJ45 (Clip Side Down)
RJ45 (Clip Side Down)
CROSSOVER
CONNECTIONS
CROSSOVER CABLE
FOR MDI TO MDI, OR MDI-X TO MDI-X
TIP:
You can easily determine if a patch cable is a crossover cable upon
inspection by holding both end plugs together in the same direction and
reading the wire colors from left to right through the clear portion of the plug.
If the wire color arrangement is in the same order, then the cable is a
straight cable. Otherwise, it’s a crossover cable (
or good cable gone bad
).
Note that all ports of this switch are Automatic MDI/MDI-X and will
automatically swap the Tx/Rx channels pairs, as required. As such, a
straight-through or crossover cable can be used to connect to any port
of this device. However, it is not good practice to use crossover
cables when wiring to a switch or hub, as the ports of these devices
are already wired MDI-X.
Refer to the Accessory Cables section at the back of this manual for more
information on accessory cables including patch and crossover cables
available from Acromag and other vendors.
TIP:
You can significantly enhance the EMI/RFI performance of your
network connections by using Category 5E STP cable (Shielded Twisted
Pair) with shielded RJ45 plug connectors. This will also help to protect your
installation from damage due to ESD (Electro-Static Discharge). The use of
shielded cable is strongly recommended for installations in harsh industrial
environments and/or in the presence of strong electrical fields.
CONNECTIONS
Network
For 100Base-TX systems, at a
minimum, use data grade
Unshielded Twisted-Pair
(UTP) wiring that has a 100
Ω
characteristic impedance and
meets the EIA/TIA Category
Five wire specifications.
For 10Base-T systems, you
may use Category 3, Category
4, or Category 5 UTP cable.
In either case, you are limited
to 100 meters between any
two devices.
A crossover cable simply
connects the differential
transmit pair on each end, to
the receive pair at the opposite
end.
Note that network switches
and hubs are wired MDI-X by
default, while your PC is wired
MDI.
This switch does not require
use of a crossover cable.
It is documented here for use
with Acromag 9xxEN Ethernet
I/O modules.
