3-1
CHAPTER 3
INSTALLING THE IRM
This chapter contains instructions for installing the Cabletron Systems
IRM into a Cabletron Systems' MMAC. Additional instructions are
provided on setting the mode switches and for connecting segments to the
IRM.
3.1
UNPACKING THE IRM
Before you install the IRM, you should visually inspect the module.
Unpack the module as follows:
1. Remove the shipping material covering the IRM in the shipping box.
2. Carefully remove the module from the shipping box. Leave the
module in its conductive bag until you are ready to install it. Save the
shipping box and materials in the event the unit has to be reshipped.
3. Visually inspect the module. If any damage appears to have occurred,
contact Cabletron Systems' Technical Support immediately.
3.2
SETTING THE IRM JUMPERS
On the IRM are five jumpers (See Figure 3-1). Three of the jumpers, JP2,
JP4, and JP5, can be changed. JP1 is for Cabletron Systems use only and
should not be changed from its default positions. JP3 is not used.
3.2.1
Setting the Battery Enable/Disable Jumper (JP5)
The Battery Enable/Disable Jumper (JP5, Fig. 3-1) allows you to enable
or disable the Battery Backed-up RAM on the IRM. When set to the
Enabled position, all parameters that you enter into the IRM
