Specifications

60 IBM Voice Over Frame Relay Perform Guide
When you enable the interface and one or more circuits for BRS and do not
configure any c-classes or t-classes, all the circuits are assigned to one c-class
called the default. With this configuration, there will be only the default c-class on
the queue of c-classes and each of the circuits in the c-class with packets for
transmission will be handled in a round-robin order. If you want BRS to do this,
leave all circuits in the default c-class and do not create any other circuit classes.
Figure 26. BRS with S-Class versus BRS without Super-Class
In the BRS Super-Class demonstration in Japan, the following hardware
configuration was used. IBM 8275 is an Ethernet switch.
Figure 27. BRS Super-Class Demonstration
At first both 2212s are defined without BRS and no IP traffic. Voice quality using
both sides of 2212 FXS and E&M/PBX is very good. When WWW and ping traffic
is generated, voice quality will be very poor.
Local 10%
Defaul t 90%
VOFR (Urgen)
DE b it : OFF
OSPF,etc
DE b it : OFF
DLSw(High)
DE bi t : OFF
Other (Normal)
DE b it : ON
Local 10%
OSPF
Default 20%
Other(Normal))
SNA 70%
DLSw( Hi g h)
Super-Class
VOFR(Urgent)
WAN WAN
AIS V3.2 or lower
IBM
2212
40F
FXS
2212
40F
E&M
8275
WWW Serer
WWW Browser
IBM
PBX
8275