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Theory of Operation

Hot-swap mechanism

A hot swap switch on the bottom of the SPM is activated by the lower ejector latch. It can be

used to request to the system that the SPM be removed.

LEDs

There are four LEDs on the SPM face plate.

These LEDs are located in the same vertical locations as the corresponding LEDs on the front

modules per the ATCA specification.

Event inputs

There are four general-purpose inputs supported through an 8-pin 2.5 mm Phoenix ‘Micro

Combicon’ header on the SPM’s face plate. The SPM provides both the header and the mating

terminal block.

Table 2. Face-plate LEDs

LED Color LED Color

Out of Service (OOS)

Red or amber

Application Amber

Power Green Hot Swap Blue

Software controlled

Note

The SCM LED activity differs from the SPM LED activity. The SCM requires three states to properly negotiate

redundant modules: Active (on), Standby (off), and Pending (blinking). The SPM requires only two states:

Active (on) and Standby (off).

Input Description

GPIN 0

GPIN 1

GPIN 2

GPIN 3

Each of these inputs is optically isolated and provides up to 1500 volts of isolation. Each

input can be switched in a range between 3.3 and 72 volts. These inputs provide reverse

polarity protection for the optical isolator.

See Table 7, “Event input header contact functions,” on page 23 for the pinout of the

header.

1 2 ... 9 10 11 12 13 14 15 16 17 18 19 ... 29 30

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