Specifications

Mobility and Logistics, Traffic Solutions

Sopers Lane, Poole, Dorset, BH17 7ER

Security classification Unrestricted Page 17 of 83

Version 2 Status Released

Last Editor Harry Smyth Date 09/12/2014

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

3.2.4 ST950 CPU Card

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

shown in Figure 2. The CPU Card is 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

3.2.5 CPU I/O Card

The ST950 Controller can be equipped with additional Input/Output cards, remote from the

CPU card. However, the ST950 can also be equipped with a CPU I/O Card, mounted in a

daughter board arrangement on the CPU Card. Please refer to Figure 3.

Figure 3 – CPU I/O Card

The CPU Card I/O is not supplied in the Outercase chosen from Table 1, it is ONLY

supplied with specific Cuckoo kits as an option. Ultimately, all I/O signals are returned to /

derived from the ST950 Processor. The ST950 CPU Card, CPU I/O card, and other

components described later in this handbook (I/O cards on the termination panel and

Intelligent back planes) communicate via a GSPI serial interface. The serial communication

is carried out over Cat5e cable. The serial Link relies on addressing techniques to ensure

that the appropriate information is delivered to the correct component. The order of the serial

link connections does not influence the operation of the serial link. However, for purposes of

consistency the order of connection set out in Table 2 should be used. When a component

is not fitted the serial link continued onto the next component in the sequence.