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Cisco 5915 Embedded Services Router Hardware Technical Guide
OL-24796-01
Temperature Out of Range Detection
router halts. Once the router is power-cycled, the router will boot normally. If you choose to use the
erase-flash
option, the boot process stops at ROMMON because the Flash file system that normally
contains IOS is empty. If you choose to use the
erase-all
option, the Cisco 5915 ESR will have no user
data or binary code in router memory after the factory default process is complete.
Figure 8
Factory Default Setting Trigger Implementation
Temperature Out of Range Detection
When the Cisco 5915 ESR detects that the temperature is out of range, that is the temperature is either
too high or too low, the router toggles (blinks) the LED_OVER_TEMP signal for 50 seconds. Assuming
the temperature remains out of range during this period of time, the router deasserts (turns off) the
LED_OVER_TEMP signal and reboots to ROMMON.
Using the Cisco 5915 ESR
The Cisco 5915 ESR can be deployed in a variety of applications and physical formats.
I/O signal access is provided via edge fingers. The edge fingers are intended to connect with standard,
commercially available PCI-Express connectors.
Typically, integrators use a custom wiring board to access the I/O signals. For instance, one side of the
wiring board is populated with the PCI-Express connectors, while the other side is populated with
RJ-45s and/or circular shell connectors. This method works best when the enclosure is designed such
that the end product I/O panel is very close to the edge finger side of the Cisco 5915 ESR.
Another I/O access option is to use a flex circuit assembly. A custom flex circuit assembly can be
designed such that part of the assembly is rigid and part is more like a ribbon cable. The standard
connectors (PCI-Express, RJ-45, circular shell, etc.) can be placed on the rigid parts of the assembly.
This method provides a compact solution and is also useful when the end product I/O panel is not located
close to the edge finger side of the Cisco 5915 ESR.
Receiver
Factory Default
Setting Trigger
Switch
External
vIL=0.8V;vIH=1.7V
3.3V
C5915
Edge
Finger
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