3.16.2 CIC/CTB Interfaces: Serial Phase Bus (SPB)
The CIC/CTB has two SPB interfaces, SPB In and SPB Out. The SPB-IN connection for the first CIC/CTB
in the system connects to the ST950 CPU. The SPB Out connects to the next CIC/CTB in the system
via its SPB-IN connector.
Over this interface the ST950 CPU can obtain lamp states as well as inventory and fault
information from the CIC and the Nodes.
The scheme is arranged such that messages sent by the ST950 CPU are routed to, and seen by, all
devices on the bus but replies from downstream devices are directly routed to the ST950 CPU
without being seen by other devices on the bus.
3.16.3 CIC/CTB Interfaces: GSPI Bus
The CIC/CTB has two GSPI interfaces, GSPI In and GSPI Out. The GSPI In connection for the first
CIC/CTB in the system connects to the ST950 EFC. The GSPI Out connects to the next CIC/CTB in
the system via its GSPI In connector. The last CIC/CTB in the system may, via its GSPI Out, connect
to optional Serial I/O Cards. Refer to section 3.16.11.
Over this interface the ST950 CPU can obtain I/O input states as well as inventory and fault
information from the CIC and the Nodes.
The communication scheme is arranged such that messages sent by the ST950 CPU are routed to,
and seen by, all devices on the bus but replies from downstream devices are directly routed to the
ST950 CPU without being seen by other devices on the bus.
3.16.4 CIC/CTB Interfaces: Street Terminations
The Plus
+
street cabling connects to the cage clamp terminals (SK5, SK6 and SK7). Each Plus
+
street
cable carries four wires; +48V (Red), 0V (Blue), D+ (Yellow) and D- (Black). Each street cable will
terminate to a Ring or Arm connection as specified by the site configuration. The following
diagram shows a connection to Ring 1A.
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