6
Network Backbone and Network Nodes
A network bus backbone consists of network cabling, terminators and T
connectors. Network nodes are made by fitting T-shaped connectors into
the backbone (using the sockets on the sides) and attaching any network
device to the bottom of the T.
Staying with the previous phone wiring example, T connectors on the
backbone are the equivalent of phone jacks spread throughout a house.
To pick up a phone and be able to hear a conversation from another
phone in the house, both phones have to be connected to the main phone
line. In similar fashion, only sensors and display units plugged into the
NMEA network can share information. The network backbone is like the
phone wiring that runs throughout a home.
It connects the network nodes, allowing them to communicate across the
network. Connections found in the middle of the bus could have T connec-
tors or backbone network cable plugged into one or both sides.
Connections at the end of a network will have the backbone cable plugged
into one side and a terminator plugged into the other, as shown in the fol-
lowing figure.
NMEA 2000 network node located at the end of a NMEA 2000 backbone.
NOTE:
If you have a double T Connector on your network that is not at-
tached to a device, you must cap the unused connector with a
NMEA 2000 cap. This will protect the pin connectors from corro-
sion. The NMEA 2000 cap looks like a terminator, but has "Cap"
stamped into the connector housing.
Backbone cable
(to rest of bus)
Cable from
sensor or
display unit
Terminator at
the end of the
backbone (bus)
Double T
connector
Cap for unused
connector
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Summary of Contents for EP-80R TH
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