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Understanding ATM DXI Concepts
117375-A Rev. A 2-3
• Address Resolution Protocol (ARP) and Inverse ARP support
The DSU/CSU supports the following layers:
• Segmentation and Reassembly (SAR) sublayer of the ATM adaptation layer
(AAL)
• ATM layer defined in the B-ISDN PRM
• Physical layer interface to the ATM network through DS1 and DS3
Multiprotocol Encapsulation
Multiprotocol encapsulation enables the router to multiplex and demultiplex
bridged or routed protocol data units (PDUs).
For transmission, this function adds a header from 2 through 8 octets in length to
the PDU to allow decoding. The decoding process determines the proper service
access point (SAP).
When receiving packets, this function evaluates the header to determine whether
the PDU is a valid routed or bridged packet. If it is valid, this function then strips
the header from the packet and passes it to the appropriate SAP for routing or
bridging.
AAL Sublayer Support
The CS in the router logically connects to the SAR in the DSU/CSU using a
common interface defined by the ATM DXI protocol. The ATM DXI protocol
interface transfers PDUs between the CS and the SAR. Figure 2-2 shows the
functional division of the AAL sublayers between the router and the DSU/CSU.
- Configuring ATM DXI 1
- Services 1
- Contents 5
- 117375-A Rev. A 11
- About This Guide 13
- Conventions 14
- Acronyms 15
- Bay Networks Customer Service 17
- How to Get Help 17
- For More Information 18
- Chapter 1 19
- Starting ATM DXI 19
- Adding ATM DXI to the Router 20
- Appendix , “VPI Number 21
- Appendix , “VCI Number 21
- Where to Go Next 23
- Chapter 2 25
- ATM DXI Support 26
- Multiprotocol Encapsulation 27
- AAL Sublayer Support 27
- ATM DXI Error Checking 28
- ATM DXI LMI Support 29
- ATM DXI Implementation Notes 30
- ATM DXI Modes of Operation 31
- Configuring ATM DXI Services 32
- 2-8 117375-A Rev. A 32
- Figure 2-4. Group Access Mode 33
- 2-10 117375-A Rev. A 34
- 117375-A Rev. A 2-11 35
- 2-12 117375-A Rev. A 36
- ATM DXI and Multipath Support 37
- 2-14 117375-A Rev. A 38
- Figure 2-8. Multipath Network 38
- ATM Layers 39
- 2-16 117375-A Rev. A 40
- ATM0005A 41
- Chapter 3 45
- ATM DXI Window Basics 45
- Managing Protocols 47
- Chapter 4 49
- Changing the DXI Mode 50
- Assigning Data Encapsulation 51
- 4-4 117375-A Rev. A 52
- Enabling or Disabling LMI 53
- Chapter 5 55
- Customizing ATM DXI PVCs 55
- Enabling or Disabling a PVC 56
- Changing the PVC Access Mode 57
- 5-4 117375-A Rev. A 58
- Appendix A 61
- Interface Parameters 62
- 117375-A Rev. A A-3 63
- 64
- PVC Parameters 65
- 67
- Appendix B 69
- Site Manager Default Settings 69
- 117375-A Rev. A Index-1 71
- 117375-A Rev. A Index-3 73
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