Nortel Networks Circuit Card 311 - Manual (Page 343)

Functional description 343
Table 144
Impedance level and loop mode switch settings
Swit
ch
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
Transmission mode
A per-trunk switch (S4/S10) provides selection of the digital trunk interface
type. Refer to
Table 145 "Impedance level and loop mode switch settings"
(page 343) .
Table 145
Impedance level and loop mode switch settings
Description S4/S10 switch settings
E1 OFF
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 146 "Trunk interface line
build out switch settings" (page 343) .
Note: Do not change this setup.
Table 146
Trunk interface line build out switch settings
Switch setting
Description S5/S11 S6/S12 S7/S13
0dB OFF OFF OFF
Receiver impedance
A per-trunk set of four DIP switches (S8/S14 provides selection between 75
or 120 ohm values. Refer to
Table 147 "Trunk interface impedance switch
settings" (page 344) .
Nortel Communication Server 1000
Circuit Card Reference
NN43001-311 01.04 Standard
Release 5.0 23 May 2008
Copyright © 2003-2008, Nortel Networks
.