NT8D14 Universal Trunk card Page 619 of 906Circuit Card Description and Installation• DID trunks exceeding a loop resistance of 600 ohms• RAN trunks operating in pulse start or level start modesFigure 140 on page 620 shows jumper locations on the universal trunk card(vintage BA).Service change entriesThe trunk type, terminating impedance, and balance network are selected bymaking service change entries in the Trunk Administration program LD 14.See Table 193 on page 621 for the proper values for the trunk type and looplength. Refer to Software Input/Output: Administration (553-3001-311) forLD 14 service change instructions.Before the appropriate balance network can be selected, the loop lengthbetween the near-end and the far-end (a Central Office, for example) must beknown. To assist in determining loop length, some typical resistance and lossvalues for the most common cable lengths are given in Table 194 on page 622for comparison with values obtained from actual measurements.
