92 Chapter 8 Lines overviewNN40020-603NN40020-603Physical linesPhysical lines are the central office (CO) trunks assigned to the trunk media bay modules. See theInstallation and Maintenance Guide (NN40020-302) for information about which lines areenabled.You can change the line types to suit your system. For instance, BRI and DTM modules can bedesignated to a number of line types, depending on the type of line service provided through thecentral office (CO). However, the line numbers are associated for specific tasks or to specificDS30 bus numbers.The line record allows you to program settings for lines that affect how the lines operate in thenetwork and with other switches, as well as how the system uses the line.Trunk types:• VoIP• DTM (digital): TI types (Loop, E&M, DID, Ground, or fixed data channel), PRI, DASS2,DPNSS.• CTM (North America)/GATM: Analog Loop• BRI: BRI S/T• Target linesBRI loops programmingThe Loops panels define the loop numbers and loop attributes that correspond to the DIP switchsettings that were configured on the BRI trunk media bay modules installed on your system. Checkyour Programming Record to see which modules are installed, and what settings were chosen.Available BRI trunk loop attributes are determined by the country profile that is assigned to yoursystem. All profiles allow BRI programming; however, there is a difference between T1-basedprofiles and for E1-based profiles.Once loops are provisioned, the system assigns two line numbers per loop. These lines are thenprogrammed as you would any other lines.You can program a loop to support either trunking services to the ISDN network, or terminalservices to one or more ISDN devices. The following sections describe the programming for eachtype of loop. For complete module installation instructions and safety precautions, see theInstallation and Maintenance Guide (NN40020-302).Programming linksDetermine line assignments for routing: “Line Job Aids” on page 94.
