IBM3229P2035
Advance
IBM Packet Routing Switch Serial Interface Converter
Figure 20: Switch X Loopback
Y
IBM Packet Routing Switch Serial Interface Converter
X
X/Y
X/Y
DASL
DASL
Ingress
Egress
X
Y
Protocol
Engine
Switch Control
Perform the following operational sequence to execute the switch loopback (starting from operational mode):
1. Set the converter in OBFC mode.
2. Force X or Y switch plane in service or let the switch control decide which switch plane is in service.
3. Set the switch loopback bit corresponding to the plane to be set in loopback.
4. Initiate the traffic from the switch control.
The data transfer must have been stopped for long enough and in such a way that all buffers are empty before
the loopback is initiated. If the buffers are not empty, reset the path on which the loopback is to be performed.
To execute the loopback, the converter must be set in OBFC mode to avoid modifying the packet qualifier
byte.
prssi.02.fm
Functional Description
Page 45 of 154
March 1, 2001
IBM [ IBM ]
