IEC 61850-9-2 Edition 2 out for CDV ballot

The Committee Draft for Vote for IEC 61850-9-2 Ed.2 has been published the other day (document 57/996/CDV):
Communication networks and systems for power utility automation - Part 9-2 Specific Communication Service Mapping (SCSM) – Sampled values over ISO/IEC 8802-3

Closing date for commenting and voting: 2009-09-11
(contact your national TC 57 committee for a copy).

The following are two extensions in the CDV of Edition 2:

• Link Redundancy: Parallel Redundancy Protocol and High Availability Seamless Ring (according to IEC 62439-3) - optional
• Sample Mode has been added to the control block and sample value message:
  0 = samples per nominal period (DEFAULT)
  1 = samples per second
  2 = seconds per sample
  If not available (backward compatibility) the
  default value is 0.