WTB is the Wire Train Bus. MVB is the Multifunction Vehicle Bus. Both are used in rail transit systems. The WTB is typically used at the higher level and between cars. MVB is mainly used between devices within a car or within a rack. Both are covered by document IEC 61375-1:1999. In the US this can be found at the ANSI online bookstore. They are very proud of it. ----- Original Message ----- From: "vdesign" vdesign at s...> To: cores at o...> Date: Tue, 15 Apr 2003 14:34:32 +0530 Subject: [oc] WTB & MVB protocols