VPI II Overview - Alstom

Vital Subsystem4.4. VSC (VITAL SERIAL CONTROLLER) BOARD 59473-939-XXThe Vital Serial Controller board is a microprocessor-based board that provides ameans for exchanging the states of Vital interlocking functions between interlockingsystems in a Vital manner. This board family was first designed to provide Vital VPI II toVPI II Vital communications more efficiently than line wires. There are two types of datatransmission interfaces; one for private copper pairs and one for generic, EIA232, DCEconnection. A daughter board is used to provide the EIA232 connection, so the numberof chassis slots required for this interface is two (2).Two additional applications of the VSC were created to provide a means ofcommunicating to and from AF Track Circuit modules (MVSC) and programmableGenrakode modules (GVSC or GVSCE).The system software installed on the Vital Serial Controller board is associated with aparticular version of system software on the Vital processor board. Each type of board,MVSC, GVSC, GVSCE, or VSC, has its own unique Vital system software that is notinterchangeable.4.4.1. System CapacityUp to ten VSC boards or combinations of VSC, MVSC, GVSC, GVSCE, and CRGboards can be supported by a single Vital subsystem. See Table 4–5 for moreinformation on permissible combinations of these boards.Figure 4-4. VSC BoardP2511G, Rev. Jan/06 4–6 ALSTOM Signaling Inc.