Nortel Networks 311 사용자 설명서
Architecture
939
Table 390
Impedance matching switch selection
Impedance matching switch selection
Cable
On
Off
75 ohms
S2
S1
120 ohms
S1
S2
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.
card. This is indicated by a white dot printed on the board next to the
bottom left corner of each individual switch.
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.
twisted pair cable. The impedance is selected by a switch, as shown in the
settings table below.
Table 391
Impedance matching switch selection
Impedance matching switch selection
Cable
On
Off
75 Ohm
S2
S1
120 Ohm
S1
S2
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.
card. This is indicated by a white dot printed on the board adjacent to
the bottom left corner of each individual switch.
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
ohms twisted pair cable. The impedance is selected by a switch, as shown
in
Table 392
Impedance matching switch selection
Impedance matching switch selection
Cable
On
Off
75 ohms
S2
S1
120 ohms
S1
S2
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.
card. This is indicated by a white dot printed on the board next to the
bottom left corner of each individual switch.
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
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
.
Nortel Communication Server 1000
Circuit Card Reference
NN43001-311
01.04
Standard
Release 5.0
23 May 2008
Copyright © 2003-2008, Nortel Networks
.