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The line interface provides for the use of either 75 ohms coaxial or 120
ohms twisted pair cable. The impedance is selected by SW2, as shown in
Table 410 "Impedance matching switch settings" (page
Table 410
Impedance matching switch settings
Carrier grounding
NTBK50 enables the shield of the Tx and/or Rx pairs of the carrier to be
selectively grounded. Closing (down position) the on-board switch applies
FGND to the appropriate carrier cable shield. The switch settings are shown
in
Table 411 "Carrier Shield grounding switch settings" (page
Table 411
Carrier Shield grounding switch settings
NTBK50 provides for 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 below.
NTBK50 enables the shield of the Tx and/or Rx pairs of the carrier to be
selectively grounded. Closing (down position) the on-board switch applies
FGND to the appropriate carrier cable shield. The switch settings are shown
in
Table 414 "Carrier Shield grounding switch settings" (page
Carrier Shield grounding (Switch SW4)
Table 412 "Carrier Shield grounding switch settings" (page 982)
Carrier Shield ground switch settings.
Copyright © 2003-2008, Nortel Networks
.
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 Type
75 ohms
120 ohms
Note: The ON position for all the switches is toward 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.
Switch
SW 4 – 1
SW 4 – 2
Nortel Communication Server 1000
Circuit Card Reference
NN43001-311 01.04 Standard
Release 5.0 23 May 2008
Down (On)
Down (On)
Rx – FGND
Tx – FGND
Architecture 981
981).
SW 2-1
Up (Off)
981).
Up (Off)
Rx – OPEN
Tx – OPEN
982).
lists the
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