Specifications

Appendix C Operation, Administration, and Maintenance (OAM) Installation and Operation Manual
C-4 OAM Flows RICi-4E1/T1, RICi-8E1/T1 Ver. 2.0
• In case of one flow per UNI ( Figure C-3 ), the PM and CC are transmitted once.
Figure C-3. One Flow per UNI
• In case of multiple flows per UNI ( Figure C-4), PM and CC are transmitted
three times.
Figure C-4. Multiple Flows per UNI
• In case of one flow and multiple CoS (Service Instances) per UNI ( Figure C-5 ),
the PM is transmitted three times and the CC is transmitted once.
Figure C-5. One Flow and Multiple CoS (Service Instances) per UNI
C.4 OAM Flows
Figure C-6 illustrates a typical OAM traffic flow. The OAM message is transmitted
from the source MEP 1 to the destination MEP 2 and the reply is transmitted back
The source is also a destination for messages from the other direction.
The OAM interval is one second, so each NTU transmits one request and one
reply and receives one request and one reply. A total of four messages are
transmitted per second per service instance.
MEP 1 MEP 2
Source Destination
OAM Message
Request
OAM Message
Reply
Figure C-6. OAM Flow