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In computer networking, the maximum transmission unit (MTU) is the size of the largest protocol data unit (PDU) that can be communicated in a single network layer transaction. [1]: 25 The MTU relates to, but is not identical to the maximum frame size that can be transported on the data link layer, e.g., Ethernet frame.
The process is repeated until the MTU is small enough to traverse the entire path without fragmentation. As IPv6 routers do not fragment packets, there is no Don't Fragment option in the IPv6 header. For IPv6, Path MTU Discovery works by initially assuming the path MTU is the same as the MTU on the link layer interface where the traffic originates.
Class 73/9, one MTU 8V 4000 R43L engine [1] Class 168, Class 170 and Class 171: MTU 6R 183TD series (one per car) Class 172: MTU 6H1800R83 (one per car) Class 195 and Class 196: MTU 6H1800R85L (one per car) Class 43s: MTU 16V4000 R41R widely installed in early 2000s, replacing original Paxman Valenta engines.
Jumbo frames for PPPoE is defined in RFC 4638, with the purpose of removing the old 1492-byte limit (originally defined because PPP needs 8 more bytes of overhead), so that normal 1500-byte Ethernet can run without fragmentation. The "PPP-Max-Payload" tag can still accommodate much larger, non-baby jumbo frames.
Detroit Diesel and MTU jointly developed the 2000 and 4000 series, with Detroit Diesel leading development of the 2000 and MTU leading the 4000, each of which are named for the per-cylinder displacement in cm 3. [17] Like the Series 149, the 4000 comes in 8V-, 12V-, 16V-, and 20V- configurations.
An example of the fragmentation of a protocol data unit in a given layer into smaller fragments. IP fragmentation is an Internet Protocol (IP) process that breaks packets into smaller pieces (fragments), so that the resulting pieces can pass through a link with a smaller maximum transmission unit (MTU) than the original packet size.
The SDU and metadata added by the lower layer can be larger than the maximum size of that layer's PDU (known as the maximum transmission unit; MTU). When this is the case, the PDU must be split into multiple payloads of a size suitable for transmission or processing by the lower layer; a process known as IP fragmentation.
In contrast to standard Ethernet according to IEEE 802.3 and Ethernet bridging according to IEEE 802.1Q, time is very important in TSN networks.For real-time communication with hard, non-negotiable time boundaries for end-to-end transmission latencies, all devices in this network need to have a common time reference and therefore, need to synchronize their clocks among each other.