Difference between One Pair Ethernet vs Energy Efficient Ethernet vs Power Over Ethernet vs Gigabit Ethernet
This page compares One Pair Ethernet vs Energy Efficient Ethernet vs Power Over Ethernet vs Gigabit Ethernet and covers basic difference between One Pair Ethernet (OPEN), Energy Efficient Ethernet, Power Over Ethernet (PoE) and Gigabit Ethernet (GIG-E).
Above mentioned are types of Automotive Ethernet used in automotive industry for communication between components.
Following sections mention features of all these automotive ethernet types.
One Pair Ethernet-OPEN
Following are the features of One Pair Ethernet (OPEN).
• Supports distance of about 700 meters.
• Supports PAM-3 signaling and encoding in order to help reduce bandwidth over cable.
• Due to echo canceller functionality, this type of ethernet carry bi-directional data transfer on single pair.
• It meets EMI specification due to lower bandwidth e.g. 27 MHz or 62.5 MHz.
• 802.3bp standard supports 1G data rate over single twisted pair which links upto 15M connections. This new physical layer (i.e. PHY) is known as 1000Base-T1. Here digit '1' in 'T1' stands for single pair.
Energy Efficient Ethernet
As we know electrical components of a car doe not turn off when engine is in OFF condition. Battery capacity is limited when engine is in OFF state. This ethernet type is useful to minimize power consumption. This is achieved by turning off network segments when engine is OFF and use EEE type of ethernet is used when engine is ON. The name energy efficient ethernet has been derived from this functionality.
Power Over Ethernet-PoE
Following are the features of Power Over Ethernet (PoE).
• This is developed with minor modification to existing PoE standard.
• This has less wiring.
• The standard 801.3bu which is under development specifies PoE over a single pair.
• It is known as PoDL i.e. One Pair Power Over Data Lines.
What is PoE➤.
Gigabit Ethernet (GIG-E)
Following are the features of Gigabit Ethernet.
• It meets EMC requirement of automotive vehicles.
• It supports 15 meter range over unshielded automotive cabling.
• It supports gigabit ethernet MAC interfaces e.g. SGMII/RGMII/GMII and are defined in IEEE standard specifications.
• 1000Base-T1 draft standard is currently under development which defines gigabit ethernet PHY transceiver specifications. Following are the merits of 1000Base-T1 as mentioned below.
-Suitable for High Speed Video links.
-Support 100 Mbps uplink video channels.
-Can use cost effective unshielded cables.
-Light in weight and flexible to use
What is Gigabit Ethernet➤.
10, 40, 100 Gigabit Ethernet Physical Layers
Refer following links to navigate articles on 10, 40 and 100 Gigabit Ethernet Physical Layers.
10 Gigabit Ethernet Physical Layer
40 Gigabit Ethernet Physical Layer
100 Gigabit Ethernet Physical Layer
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