Supported Applications
101
Figure 67
DCE Allows DTE to Participate in ATM Network through ATM DXI
DXI protocol defines an open interface between brouter and Data Service Unit.
The Data Service Unit off-loads cell encapsulation services from the brouter. This
allows your current brouter to support ATM simply by supporting V.35 and
High-level Data Link Control (HDLC). The DXI protocol itself is based on HDLC and
provides simple and efficient encapsulation of the Data Service Unit and the
mapping within the HDLC frame to place the brouter data on an appropriate VC.
See Figure 68.
Figure 68
DXI Format Mode 1A Encapsulation
DTE
DXI
DCE
UNI
DTE SDU
AAL 5 CPCS
AAL 5 SAR
DXI Data Link
DXI Physical
UNI Physical
ATM
DTE SDU
DXI Data Link
DXI Physical
DTE
SDU
DTE Service Data Unit
DTE to DSU
DXI Frame
Flag
FCS
Data
DXI Information
Flag
1
2
2
1
0-9232
Octet
AAL 5 CPCS-PDU
DSU to ATM
Network
Translation
Error Check
01111110
DSU
AAL 5
SAR
SAR-PDU
DXI Protocol Mode 1A
Address Maps
to/from VPI/VCI
ATM Cell
SAR-PDU
SAR-PDU
SAR-PDU
Содержание 3C63400-3AC-C - PathBuilder S700 Switch
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Страница 260: ...246 CHAPTER 6 PATHBUILDER S700 DIAGNOSTICS AND PERFORMANCE MONITORING ...
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