Cisco 5915 Technical Manual - Page 11

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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

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.

OL-24796-01

Factory Default Setting Trigger Implementation

Receiver

vIL=0.8V;vIH=1.7V

C5915

Cisco 5915 Embedded Services Router Hardware Technical Guide

Temperature Out of Range Detection

3.3V

Edge

Finger

Factory Default

Setting Trigger

Switch

External