Nortel Networks 553-3001-211 manual Service change entries

NT8D14 Universal Trunk card Page 607 of 894

•DID trunks exceeding a loop resistance of 600 ohms

•RAN trunks operating in pulse start or level start modes

Figure 137 on page 608 shows jumper locations on the universal trunk card (vintage BA).

Service change entries

The trunk type, terminating impedance, and balance network are selected by making service change entries in the Trunk Administration program LD 14.

See Table 188 on page 609 for the proper values for the trunk type and loop length. Refer to Software Input/Output: Administration (553-3001-311) for LD 14 service change instructions.

Before the appropriate balance network can be selected, the loop length between the near-end and the far-end (a Central Office, for example) must be known. To assist in determining loop length, some typical resistance and loss values for the most common cable lengths are given in Table 189 on page 610 for comparison with values obtained from actual measurements.

Circuit Card Description and Installation