Lowrance lcx-112c 操作ガイド

 

37

A network bus is an installed and operational network cable (backbone) 
running the length of your boat, already connected to a power supply and 

properly terminated. Such a bus provides network connection nodes at 
various locations around your boat. 
The NMEA 2000 network is similar to the telephone wiring in a house. 

If you pick up a phone in your living room, you can hear someone 
talking into the phone in the bedroom. 
Network Nodes 
A network bus is built of network nodes spread along a backbone. 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." 
Using our telephone example, the T connectors on the backbone are similar 

to telephone 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 

must 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 

connectors or backbone network cable plugged into one or both sides. 

Connections at the end of a network will have the backbone cable or a T 
connector plugged into one side and a terminator plugged into the other, as 

shown in the following figure.