Analog line cards Page 217 of 236Succession Communication Server for Enterprise 1000 Circuit Card Reference GuideSelf TestThe faceplate of the card is equipped with a red LED. When an OPS analogline card is installed, the LED remains lit for two to five seconds while theself-test runs. If the self-test completes successfully, the LED flashes threetimes and remains lit. When the card is configured and enabled in software,the LED goes out.Functional descriptionThe following information describes the NT1R20 Off-Premise StationAnalog Line Card.Card interfacesVoice and signaling interfacesThe eight line interfaces provided by the NT1R20 OPS analog line cardconnect to conventional, 2-wire (tip and ring), analog line facilities. Incominganalog voice and signaling information from a line facility is converted by theNT1R20 OPS analog line card to digital form and routed to the SuccessionCSE 1000 CPU over DS-30 network loops. Digital voice and signalinginformation from the CPU is sent over DS-30 network loops to the NT1R20OPS analog line card where it is converted to analog form and applied to theline facility.The NT1R20 OPS analog line card uses only eight of the 30 availabletimeslots for its eight line interfaces. The NT1R20 OPS analog line card canbe configured in software to format PCM data in the Mu-Law or A-Lawconventions.Maintenance communicationMaintenance communication is the exchange of control and status databetween line or trunk cards and the Succession CSE 1000 CPU. Maintenancedata is transported through the card LAN link.The card LAN link supports the following functions on the OPS analog linecard:• polling• reporting of self-test status• CPU initiated card reset
