Glossary / 643N0130943 02 Modular ICS 7.1 Installer GuideNVAM resides. The connection must bemade using PRI SL-1 lines with theMCDN protocol active. Both a PRI andan MCDN software codes (as well asany required voice mail codes) arerequired for this feature.Channel Service Unit (CSU): Adevice on the Digital Trunk Interfacethat is the termination point of the T1lines from the T1 provider. The CSUcollects statistics on the quality of theT1 signal. The CSU ensures networkcompliance with FCC rules and protectsthe network from harmful signals orvoltages.Class of Service (COS): The set ofNorstar features and lines available tothe user for a call. The Class of Servicefor a call is determined by the restrictionfilters and remote access packagesassigned to the telephone in Linesprogramming. The Class of Service fora call can be changed by entering a six-digit Class of Service password.(Internal users cannot change theiraccess to features with a COS password,only their restriction filters.) Class ofService and Class of Servicepasswords are assigned in Passwordsprogramming. See Remote Access.Class of Service password:≤fl°A six-digit code that allows you toswitch from your current Class ofService to one that allows you to dialnumbers prohibited by your currentClass of Service.CLID on busy Starting with version6.1 systems, on telephones that allowCLID display, incoming calls that arrivewhen the telephone is busy will brieflydisplay a CLID.cold start: When all systemprogramming is lost. This can happenbecause you have entered the Startupfeature code≤••ÍÊÅÂÊË∏, orafter a major event, such as an extendedpower failure.Combo Cartridge: A cartridge thatallows you to connect Trunk Modulesand Station Modules to the ICS toexpand the system capacity for trunksand telephones. Combo Cartridgesprovide six-port or 12-port expansionand Services functionality with eachcartridge. See also Expansion Cartridge.Conference: ≤‹A feature allows you to establish athree-person call at your Norstartelephone.contrast adjustment: ≤•‡Allows you to set the contrast level ofyour telephone display.control telephone: A controltelephone can place the lines for whichit has responsibility in or out of aService Mode.The direct-dial telephone is a controltelephone for directing calls to the extradirect-dial telephone. A telephone ismade a control telephone and has linesassigned to it in Services programming.Coordinated Dialing Plan: (CDP)This dialing plan uses a steering code toidentify each node in a private network.This one-digit code becomes part of theset DN number rather than a separatecode. In this way, system A might havecodes in range 2100 to 2999, whereassystem B might have codes in range3100 to 3999.COS: See Class of Service.cursor: A short horizontal line thatappears on the system telephone displayto indicate that characters can be enteredusing the dialpad.
