DIN EN 50090-4-2 : 2004 Title: Home and Building Electronic Systems (HBES) - Part 4-2: Media independent layers - Transport layer, network layer and general parts of data link layer for HBES Class 1; German version EN 50090-4-2:2004, text English Year: 2004 Publisher: DIN Media GmbH Availability: Within 1-2 working days