17OverviewContents This section contains information on the following topics:"Line cards" (page 18)"Installation" (page 19)"Operation" (page 21)"Analog line interface units" (page 26)"Digital line interface units" (page 28)"Analog line call operation" (page 30)"Digital line call operation" (page 34)"Lineside T1 and E1 call operation" (page 34)"Voice frequency audio level" (page 42)"Off-premise line protection" (page 43)"Line protectors" (page 43)"Line protection grounding" (page 44)"Line and telephone components" (page 44)"Trunk cards" (page 44)"Host interface bus" (page 48)"Trunk interface unit" (page 53)"Serial Data Interface (SDI) cards" (page 55)"Uses" (page 56)"Features" (page 56)"Specifications" (page 57)"Installation" (page 58)"Maintenance" (page 59)Nortel Communication Server 1000Circuit Card ReferenceNN43001-311 01.04 StandardRelease 5.0 23 May 2008Copyright © 2003-2008, Nortel Networks.
