Overview Page 65 of 906Circuit Card Description and InstallationThe switch communicates with IPE modules over two separate interfaces.Voice and signaling data are sent and received over DS-30X loops andmaintenance data is sent over a separate asynchronous communication linkcalled the card LAN link.Signaling data is information directly related to the operation of the telephoneline. Some examples of signaling commands are as follows:• off hook/on hook• ringing signal on/off• message waiting lamp on/offMaintenance data is data relating to the configuration and operation of theIPE card, and is carried on the card LAN link. Some examples of maintenancedata are as follows:• polling• reporting of self-test status• CPU initiated card reset• reporting of card ID (card type and hardware vintage)• reporting of firmware version• downloading trunk interface unit configuration• reporting of trunk interface unit configuration• enabling/disabling of the DS-30X network loop bus• reporting of card status
