3Com manual ATM DXI Mode, PathBuilder S330/S310 to ATM PVC

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

DLCI 50

PathBuilder

S330/S310

VP 0	VC 50	ATM	VP 3	VC 45
Out		VP 0 VC 50	Out

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

CBR or VBR at

1 Mbps

1 Mbps

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 DTE

DXI Frames ATM Cells

DXI DCE

ATM

(PathBuilder

(Router)

S330/S310)

Network