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10GbE layered model

In contrast to Gigabit Ethernet( GbE), some new layers and interfaces have been defined for the layer model of10GbE. The MAC sublayer is essentially based on the familiar Ethernet high-speed versions. However, the MAC layer now only supports full- duplex transmission. In addition, there are two data rates at the MAC interface: For LANs the transmission rate of exactly 10 Gbit/s and for WAN applications the transmission rate of 9.584640 Gbit/s and an optional media-independent interface( XGMII). Linkaggregation according to 802.3ad is also supported.

A mechanism is defined at the MAC level to equalize the different data rates between local networks and wide area networks. The Medium Access Control (MAC) determines the data packet length on the sender side and extends the gap between the data packets, the Interframe Gap( IFG), until the average data rate in the WAN of 9.584640 Gbit/s is not exceeded.

Layer model of 10Gbe

Layer model of 10Gbe

XGMII, the 10 Gigabit Media Independent Interface, serves as the interface between Medium Access Control (MAC) and Physical Coding Sublayer ( PCS) or XGMII Extender Sublayer (XGXS). Data is transferred at double speed using Double Date Rate( DDR). The XGXS layer is optional and only necessary if the maximum line length of XGMII is exceeded. 8B10B coding takes place at this layer. The XAUI interface, 10 Gigabit Attachment Unit Interface, serves as the interface between two XGXS units.

The PCS layer is responsible for encoding the data. An efficient block coding was selected as the coding method for WAN applications, 64B66B coding, which requires only two additional bits for a 64-bit data block. In addition to this new coding technique, 8B10B coding is used for LAN applications.

Another component of 10 Gigabit Ethernet is the WAN Interface Sublayer (WIS). This is only required if the user wants to connect the system to a wide area network. WIS packages the Ethernet packets in STS-192c frames. On the wire, this results in a data rate of 9.53280 Gbit/s; minus the overhead, this corresponds to a data rate for the payload of 9.584640 Gbit/s on the physical coding sublayer (PCS). The SUPI interface is only required for wavelength division multiplexing in wide area networks (WAN).

Informations:
Englisch: 10GbE layered model
Updated at: 13.11.2013
#Words: 359
Links: indium (In), contrast, Gigabit Ethernet (GbE), Gigabit Ethernet (GbE), layer model
Translations: DE
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