Nortel Networks Circuit Card - Manual (Page 343)

NT5D97 Dual-port DTI2/PRI2 card Page 343 of 906
Circuit Card Description and Installation
Trunk interface switches for NT5D97AA/AB
Impedance level and unit mode
The S9/S15 switch selects the impedance level and loop operation mode on
DEI2 OR PRI2. Refer to Table 122.
Transmission mode
A per-trunk switch (S4/S10) provides selection of the digital trunk interface
type. Refer to Table 123.
Line build out
A per-trunk set of three switches (S5/S11, S6/S12 and S7/S13) provides the
dB value for the line build out. Refer to Table 124 on
page 344 .
Table 122
Impedance level and loop mode switch settings
Switch Description S9/S15 Switch Setting
1 Impedance level OFF - 120 ohm
ON - 75 ohm
2 Spare X
3 Spare X
4 Unit mode OFF - Loop operates in the DTI2 mode
ON - Loop operates in the PRI2 mode
Table 123
Impedance level and loop mode switch settings
Description S4/S10 switch settings
E1 OFF
Not used