Chapter 3: Installing the IRM3
Page 3-2
IRM3 User’s Guide
3.2 SETTING THE IRM3 JUMPERS
There are eight jumpers on the IRM3 as shown in Figure 3-1. Four of the
jumpers, H1, H6, H8, and JP1 can be changed. The remaining jumpers are
for Cabletron Systems use only and should not be changed from their
default positions.
3.2.1 Setting the Battery Enable/Disable Jumper (H1)
The Battery Enable/Disable Jumper (H1, Figure 3-1) allows you to enable
or disable the Battery Back-up for RAM on the IRM3. When set to the
enabled position, all parameters that you enter into the IRM3 will be
saved if power to the MMAC should fail, or if the IRM3 is removed from
the MMAC. When set to the disabled position, all parameters entered into
the IRM3 will be lost if power is removed from the IRM3.
To set the Battery Enable/Disable Jumper perform the following:
•
To enable the battery back-up , place the jumper over Pins 1 and 2.
•
To disable the battery back-up, place the jumper over Pins 2 and 3.
This is the position in which the IRM3 is shipped.
