3Com 3C63400-3AC-C - PathBuilder S700 Switch Reference Manual page 114

100 C 4: P B
HAPTER ATH UILDER
S700 M A
ODULE AND PPLICATION
Figure 65 shows the application for DXI.
Figure 65 DXI Application
V.35/KS422/X.21/HSSI
64K to 8M to 52M
PathBuilder S700
DXI
Mode
1 A
DXI Mode 1A is designed to allow legacy routers to utilize frame based
transmission to transit an ATM network to the DXI Mode 1A device (PathBuilder
S700 QSIM/HSIM/FAM), which then performs SAR and AAL5 mapping to an ATM
PVC. See Figure 66.
Figure 66 DXI Router to ATM Connection
Internet Router
IP
DXI
DXI Link
Transport
Brouter/DXI
Internet Router
IP
DXI
DXI Link
Transport
Brouter/DXI
Through ATM DXI, the DCE allows the DTE to participate in an ATM network. See
Figure 67.
O
VERVIEW
PVC
ATM
V.35
High-speed Serial Interface -HSSI
RS 449/422
DXI
Protocol
DXI Link
DS1
V.35
DS3
High-speed Serial Interface -HSSI
AAL 5
RS 449/422
ATM Cell
DXI
Protocol
DXI Link
Path Layer
DS1
DS3
Line Layer
AAL 5
Section Layer
ATM Cell
Photonic Layer
Path Layer
ATM/DSU/SONET
Li L
PathBuilder S700
DXI
Mode
ATM 1 A
Native
Host
Synchronous
DXI
Synchronous
Transport
ATM
DXI
Transport
SONET
ATM