Hri Protocol; Ethernet Signals; Figure 7-4 Interhub Slot And Shelf Manager Connectivity - Emerson AXP1620 Installation And Use Manual

Redundancy Control
7.5.2.2
7.5.2.3
AXP1620 Installation and Use (6806800E23E)
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The HRI also includes 13 test points for in-service monitoring of the hardware redundancy
signals and for out-of-service diagnostics, enabling the ShMM-1500R to isolate failures on the
HRI to a single carrier +ShMM-1500R pair.

HRI Protocol

In the redundant configuration, the two ShMM-1500R boards communicate through the HRI by
exchanging data packets. The HRI continues to be operational in case of a single
interconnection failure and is able to detect a double failure. The HRI has a redundant
communication path, using four signals. In the case of a single wire permanent failure (the
signal gets stuck high, low or breaks), data packets continue to be transmitted through the
redundant communication path. A short between two of these four signals is considered a
double failure.

Ethernet Signals

The SAMs implement a four-port 10/100Base-T Ethernet switch. The SAM's 10/100Base-T
links to each of the system controller/switching blades in logical hub slots 1 and 2.The
backplane has a cross-connect between each hub slot and the other SAM, as shown in the
following figure. The shelf manager's carrier card has the following:
Port to ShMM-1500R
Port to BC1 (ATCA-F120)
Port to BC2 (ATCA-F120)
Port to other SAM
The shelf manager mezzanine has a port to the face plate (eth0) and a port to the SAM (eth1).
The backplane has cross-connects between each hub slot and other SAM.
Figure 7-4 Interhub Slot and Shelf Manager Connectivity
ATCA-F120 ATCA-F120
Hub Slot 1 Hub Slot 2
SAM A
Front Panel Front Panel
SAM B
Shelf Management Alarm Module
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