Instruction manual

Simrad EK60
20
850-164696 / A
Pairs
1
3
2
4
5
7
6
8
1
3
2
4
5
7
6
8
RJ45 plu
g
RJ45 plu
g
(1) TX Data + to (3) Recv Data +
(2) Tx Data - to (6) Recv Data -
(3) Recv Data + to (1) Tx Data +
(6) Recv Data - to (2) Tx Data -
(CD7002)
Figure 4 IEEE 802.3 10BaseT “cross-over” cable with
receive and transmit wires swapped
• Thick Ethernet coax is durable and can be run through
conduit and thin walls. It is relatively immune to
electromagnetic interference and cross-talk. Thick coax is
somewhat difficult to install, and the maximum cable length
is 500 meter. A maximum of 100 Ethernet transceivers can
be connected to the backbone coax.
• Thin Ethernet coax is cheaper than thick coax, the
maximum cable length is 200 meters and a maximum of 30
Ethernet transceivers can be connected. The cable must be
cut at each transceiver and a BNC T-unit used for tapping the
signal. Some computers have a built-in transceiver with a
BNC connector at their rear allowing the computer to be
connected directly to the thin coax cable.
• Fibre-optic Ethernet cable is resistant to electromagnetic
interference, radio interference, lightning and high voltages.
It is also difficult to tap making it very secure. Attenuation is
extremely low allowing data to be transmitted a distance of
2000 meters. Fibre transmission is used mostly for
point-to-point connections.
• Twisted-pair wire is similar to ordinary telephone wire. It is
inexpensive and easy to install, but is not as durable as coax.
An Ethernet HUB unit is required at the central point.
Available units typically contain from 8 to 32 ports.