Adding a 3com 4400 se to the stack

I couldn't find the procedure to do this since 3com has been bought by HP, I just got thru doing it today successfully so here are my recommendations
my 4400's are at firmware v 6.11
there are 2 optical daughter cards in my stack configured as an aggregated link

reset the switch you want to add to the stack to factory defaults; you can find this in the web interface or the command line
this will NOT reset the IP config of the management interface
set the password and SNMP community strings to the same as the stack you are adding to; if you don't change these before hand the entire stack will not be IP manageable until you change pw+snmp via the serial interface; i saw much strangeness doing it after so do it ahead of time.


make sure you add the switch to the highest end of the stack; look at the LEDs on the front to determine which switch is unit 1; don't connect anything to the unit 1 end or it will want to become the stack master and push its empty config on all the other switches.  connect to the high end of the stack.

don't move any optical uplink daughter cards arround during this process; leave them where they are

all of my stacking daughter cards have the same model number so i left them where they were
disconnect the backplane cable from the highest unit number and attach the plastic box with 2 db9 connectors to the stacking daughter card; the plastic box has color coded squares beside the connectors to tell which end of the short cable goes where.

connect the short cable to the plastic stacking box and the newly added switch, making sure to follow the colored squares to get it the right way around
power on the newly added switch unit after all the connections are made

when i added the new unit the rest of the stack did NOT power cycle; i don't think they lost connectivity but i didn't have a ping running to know for sure.