In NMEA 2000 networks, trunk line cables and backbone cables refer to the same type of cables, but are called differently. NMEA 2000 is a standard for communication between electronic devices on ships, and is commonly used for data exchange between ship navigation, communication, and monitoring equipment. If you need help, please contact sales03@PCM-cable.net
Trunk Line Cable / Backbone Cable
1. Definition and Use
Definition:
Both Trunk Line Cable and Backbone Cable refer to the backbone cables of the NMEA 2000 network, which are used to connect various device nodes in the network to form a central communication link.
Use:
The main purpose of these two cables is to transmit data and power, ensuring that various devices connected to the network can communicate seamlessly.
Connector interface
NMEA 2000 cables usually use a standard M12 connector, which has 5 pins for power, ground, and data transmission.
Common connector types are:
M12 A-coded (5-pin) connectors:
Pin 1: Power (+12V)
Pin 2: Data high (CAN_H)
Pin 3: Ground (negative power supply)
Pin 4: Data low (CAN_L)
Pin 5: Shield (ground)
Structure and Installation
Trunk Line Cable and Backbone Cable are generally made of high-quality twisted pair shielded cables to reduce electromagnetic interference and improve the reliability of data transmission.
The length of the cable is usually customized according to the specific installation requirements, but the total length should not exceed 200 meters (656 feet) to ensure signal integrity.
Installation
One end of the cable is connected to the power source, and the other end is connected to the network terminal device or connected to other devices through a T-connector.
The T-connector allows the branch cable (drop cable) to be connected to the trunk cable (trunk line/backbone cable) to form a network node.
In addition to the trunk line and backbone cable, drop cables are also used in NMEA 2000 networks to connect individual devices to the backbone cable.
Purpose and connector interface of Drop cables
Purpose:
Drop cables are used to connect from the backbone cable to individual NMEA 2000 devices. They are usually shorter and the maximum length should not exceed 6 meters (20 feet).
Connector interface:
Drop cables also use the same M12 connector as the backbone cable to ensure seamless connection to the network.
Summary
Trunk Line Cable and Backbone Cable are the core parts of the NMEA 2000 network. They are responsible for connecting all devices and transmitting data.
They use standard M12 connectors and are customized according to installation requirements to ensure efficient and reliable communication in ship electronic systems.
