Analog Trunk Cards - NT8D14 Universal Trunk Card Page 87 of 236Succession Communication Server for Enterprise 1000 Circuit Card Reference GuideConfigurationThe trunk type for each unit on the card as well as its terminating impedanceand balance network configuration is selected by software service changeentries at the system terminal and by jumper strap settings on the card.NT8D14BB (Release 10 and higher) has a reduced jumper strap setting on thecard. There are only three jumpers, J1.X, J2.X, and J3.X on each channel.Tables 11, 12, and 13 show the functionality of these 3 jumpers.Jumper strap settingsFor most applications, the jumper strap settings remain set to the standardconfiguration as shipped from the factory. See Table 11 on page 88.For CO/FX/WATS or tie trunk loops exceeding 1524 meters (5000 ft.), DIDtrunks exceeding a loop resistance of 600 ohms, or RAN trunks operating inpulse start or level start modes, the jumper strap settings must be changed asshown in Table 12 on page 89. Figure 32 on page 90 shows jumper locationson 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 13 on page 91 for the proper values for the trunk type and looplength. Refer to Succession Communication Server for Enterprise 1000 X21Software Input/Output Guide Administration (553-3023-311) for LD 14service change instructions.Before the appropriate balance network can be selected, the loop lengthbetween the near-end (Succession CSE 1000) and the far-end (a CentralOffice, for example) must be known. To assist in determining loop length,some typical resistance and loss values for the most common cable lengthsare given in Table 14 on page 91 for comparison with values obtained fromactual measurements.
