Nortel Circuit Card Installation Manual page 343

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.
Table 122
Impedance level and loop mode switch settings
Switch
1
2
3
4
Transmission mode
A per-trunk switch (S4/S10) provides selection of the digital trunk interface
type. Refer to Table 123.
Table 123
Impedance level and loop mode switch settings
Description
E1
Not used
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
NT5D97 Dual-port DTI2/PRI2 card
Description
Impedance level
Spare
Spare
Unit mode
S9/S15 Switch Setting
OFF - 120 ohm
ON - 75 ohm
X
X
OFF - Loop operates in the DTI2 mode
ON - Loop operates in the PRI2 mode
S4/S10 switch settings
OFF
Circuit Card Description and Installation
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