Specifications

Mobility and Logistics, Traffic Solutions

Sopers Lane, Poole, Dorset, BH17 7ER

Security classification Unrestricted Page 49 of 83

Version 2 Status Released

Last Editor Harry Smyth Date 09/12/2014

Document Name Configuration Control Document No. 667/CC/45950/000

Figure 33 –ST950ELV Rack Assembly

4.2.2 Logic Power Unit

The LPU (Logic Power Unit) is powered by the Mains 230V AC supply and is contained

within the Rack Assembly, refer to Figure 33 A switch-mode power supply mounted in the

LPU produces +5V and +24V DC supplies used by PCBs within the cabinet. The Logic

power Unit does not need to be ordered separately as it is contained within the Rack

Assembly.

4.2.3 ST950ELV CPU Card

The ST950 CPU Card will be mounted to a designated position in the Rack Assembly, as

shown in Figure 33. The CPU Card holds the controller configuration and performs the

function of configuration, control and management. The main external data interfaces of the

CPU Card are:

 Interface to Lamp Switch Cards

 Serial Interfaces (GSPI) to IO Cards and Intelligent Detector Backplanes

 Manual Panel

 RS232 interface to handset, Gemini

or Stratos Outstation

 USB interfaces

 Ethernet Interface