Nortel Circuit Card 311 Reference page 939

Table 390
Impedance matching switch selection
The line interface provides for the use of either 75ohm coaxial or 120ohm
twisted pair cable. The impedance is selected by a switch, as shown in the
settings table below.
Table 391
Impedance matching switch selection
Cable
75 Ohm
120 Ohm
The line interface provides for the use of either 75 ohms coaxial or 120
ohms twisted pair cable. The impedance is selected by a switch, as shown
in Table 392 "Impedance matching switch selection" (page
Table 392
Impedance matching switch selection
Carrier grounding
The NTAK79 card provides the capability of selectively grounding the shield
of the Tx and/or Rx pairs of the carrier. Closing (down) the on-board switch
applies FGND to the appropriate carrier cable shield. The switch settings are
shown in
Copyright © 2003-2008, Nortel Networks
.
Cable
75 ohms
120 ohms
Note: The ON position for all the switches is towards the bottom of the
card. This is indicated by a white dot printed on the board next to the
bottom left corner of each individual switch.
Note: The ON position for all the switches is towards the bottom of the
card. This is indicated by a white dot printed on the board adjacent to
the bottom left corner of each individual switch.
Cable
75 ohms
120 ohms
Note: The ON position for all the switches is towards the bottom of the
card. This is indicated by a white dot printed on the board next to the
bottom left corner of each individual switch.
Table 393 "Carrier shield grounding switch settings" (page
Nortel Communication Server 1000
Circuit Card Reference
NN43001-311 01.04 Standard
Release 5.0 23 May 2008
On
S2
S1
On
S2
S1
On
S2
S1
Architecture 939
Off
S1
S2
Off
S1
S2
939).
Off
S1
S2
940).