Table of Contents
Advertisement
Frame Application
The QSIM/HSIM/FAM modules support 3 modes of Frame to Cell transit services:
n
n
n
Each service is designed to support a different type of user application. However,
they all share the same ATM backbone characteristics. The QSIM/HSIM/FAM port
modules are mapped over ATM PVCs.
When you are connecting the PathBuilder S700 to an ATM network, verify that the
PVC mapping for in and out ports is defined for proper operation. See Figure 63.
Figure 63 PathBuilder S700 to ATM PVC
QSIM
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 64.
Figure 64 PathBuilder S700 Traffic Contract
VBR service will work, however the synchronous path will be subjected to possible
discards and delay.
DXI Mode 1A
DXI protocol frame is an HDLC LLC1 frame similar to PPP protocol. In terms of the
brouter, it is easier to implement DXI Protocol since it only requires the brouter to
encapsulate the SDU.
The ATM Forum defines the DXI service in three modes: 1A, 1B, and 2. The
PathBuilder S700 supports Mode 1A, which includes the following features:
n
n
n
n
DXI Mode 1A
Frame Relay Forum Specification 5 and 8; Service and Network Interworking
HDLC/SDLC
PathBuilder S700
VP 0
Out
PathBuilder S700
QSIM In
1 Mbps
1 Mbps
up to 1023 virtual connections
supports an AAL5 transit encapsulation
maximum DTE SDU size 9232 bytes
Uses 16-bit FCS
VC 50
ATM
VP 0 VC 50
CBR or VBR at
1 Mbps
Sustained Cell
Rate
Supported Applications
PathBuilder S700
VP 10
VC 45
VP 10
Out
VC 45
In
99
Advertisement
Table of Contents
