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data exchange interface (DXI)

The Data ExchangeInterface (DXI) is an ATM Forum specification described in RFC 1483. DXI is a frame-oriented protocol that specifies how network components such as bridges, routers, or hubs in an ATM network or Switched Multimegabit Data Service (SMDS) interoperate with a Data Service Unit (DSU) that supports the Segmentation And Reassembly Sublayer (SAR) function.

Originally, the DXI interface was specified as a data feeder protocol for metropolitan area networks (MAN). Since there was no ATM-specific DXI specification, many vendors also implemented the SMDS-DXI as a High Speed Serial Interface (HSSI). In 1993, the ATM Forum defined a modified DXI specification, ATM-DXI, which was, however, incompatible with the SMDS-DXI of the time.

The functions of HSSI and DXI as a data feeder service

The functions of HSSI and DXI as a data feeder service

DXI distinguishes between two modes: mode 1 with 1,024 virtual channels (VC), ATM Adaption Layer (AAL) type 5, 16-bit CRC and a maximum of 8k frames, mode 2 with 16 million VCs, AAL type 3 to 5, 23-bit CRC and 64k frames.

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Englisch: data exchange interface - DXI
Updated at: 25.06.2011
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Translations: DE