Atm Dxi Mode - 3Com SuperStack II PathBuilder S330 Reference Manual

When connecting the PathBuilder S330/S310 to an ATM network, verify that the
PVC mapping for in and out ports is defined for proper operation. (See
Figure 153.)
Figure 153 PathBuilder S330/S310 to ATM PVC
PathBuilder
S330/S310
Frame
VP 0
In
Out
DLCI 50
It is also important to select the proper traffic contract from the ATM
switch/service provider. This card should utilize a VBR or CBR circuit set at the
speed of the connected port. (See Figure 154.)
Figure 154 PathBuilder S330/S310 Traffic Contract
PathBuilder S330/S310
Frame In
1 Mbps
VBR service will work; however the synchronous path will be subjected to possible
discards and delay.
The following subsections describe the supported frame protocol modes in greater
detail.

ATM DXI Mode

ATM DXI mode is used to interconnect a DTE to a DCE. The DTE is typically a
legacy interworking device with limited ATM capability. Through ATM DXI, the
DCE allows the DTE to participate in an ATM network. Figure 155 illustrates a
PathBuilder S330/S310 in the ATM DXI network.
Figure 155 DXI Network Connection
DXI DTE
(Router)
VC 50
ATM
VP 0 VC 50
CBR or VBR at
1 Mbps
1 Mbps
Sustained Cell
Rate
DXI Frames
DXI DCE
(PathBuilder
S330/S310)
Serial Interface
PathBuilder
S330/S310
VP 3
VC 45
VP 3
Out
VC 45
In
ATM Cells
ATM
Network
215