I'm here installing a pots line on a pertner ACS (REel not know) I cant get into system programming mode changed the phone and switch to Ext 10 and 11. a very sensitive situation on the site and director does not want me to power down the switch. Is there sometjinbg I am missing (as I can get into cetral programming) before ordering a module to keep on hand in case it conks outs during reboot?