Nortel Networks 311 User Manual
Functional description
343
Table 144
Impedance level and loop mode switch settings
Impedance level and loop mode switch settings
Swit
ch
Description
S9/S15 Switch Setting
1
Impedance level
OFF - 120 ohm
ON - 75 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
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
type. Refer to
Table 145
Impedance level and loop mode switch settings
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
the dB value for the line build out. Refer to
Note: Do not change this setup.
Table 146
Trunk interface line build out switch settings
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
or 120 ohm values. Refer to
.
Nortel Communication Server 1000
Circuit Card Reference
NN43001-311
01.04
Standard
Release 5.0
23 May 2008
Copyright © 2003-2008, Nortel Networks
.