Hitachi supports the International Telecommunications Union management standard known as Y.1731.
It a service layer protocol that measures SLA parameters end-to-end from UNI to UNI. To measure SLA parameters such as delay or frame delay variation, a small number of synthetic frames are transmitted along with the service to the end point of the maintenance region, where the MEP responds to the synthetic frame. For a function such as connectivity fault management, the messages might be sent less frequently, while performance management frames might be sent more frequently. For services requiring protection switching, a connectivity check message can be sent up to 300 times per second to support 50msec protection.
The following procedures are included in ITU-T Y.1731 standard:
Hierarchical Maintenace Domains & Maintenace Points
