Monitoring Line Card; Spine Card Block Diagram - HP Cluster Platform Interconnects v2010 Manual

Figure 3-5: Spine Card Block Diagram
µC
Sense &
Clocks
Control
7 6

3.3 Monitoring line card

All system interconnects must have a monitoring line card installed. The
monitoring line card is powered from the dual +12V sources in the same way as the
port line cards, and likewise includes a small microcontroller to monitor internal
functions, voltages, and temperatures. The monitoring line card is keyed by the
position of the backplane connector so that it can be inserted only in the top slot of
an enclosure, and so that port line cards cannot be inserted into this slot.
The main circuitry on the card is a microcontroller with RAM and flash
memory that communicates internally via 26 individual serial links with small
microcontrollers on the port line cards, backplane XBars, the fan-monitoring
board, and on the monitoring line card itself. Self-test, board identification,
voltage monitoring, and temperature monitoring are some of the functions of
the monitoring line card. All status information is reported on demand through
the serial link to the main microcontroller. The microcontroller will shut off the
line-card power on over-temperature or other fault conditions.
The front panel of the monitoring line card (Figure 3-6 and Figure 3-7) has
a Status LED, green for operating and yellow for fault. The card also has
dual-redundant 10-Base Ethernet ports. Each Ethernet port has a green LED. If
the LED is off, the card is not connected to an active port. If the LED is on, the
card is connected to an active port. If the LED is blinking, there is traffic. There
are two other LEDs for the +12V A and B internal power buses.
3-4 Switch, spine and monitoring line cards
Backplane Interface
7 6 5 4
Serial link
Physical-Level Conversion Circuits
5 4
Front-Panel Ports
3 2 1 0
dual +12V
Power & hot-swap
circuits
3 2 1 0