3Com 3C63311 Reference Guide - Page 227

Serial Interface 215 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 Frame In PathBuilder S330/S310 VP 0 DLCI 50 Out VC 50 ATM VP 0 VC 50 VP 3 Out VC 45 PathBuilder S330/S310 VP 3 VC 45 In 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 1 Mbps CBR or VBR at 1 Mbps Sustained Cell Rate 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 Frames ATM Cells DXI DTE (Router) DXI DCE (PathBuilder S330/S310) ATM Network