Carrier grounding, Receiver functions – Nortel Networks 1000 User Manual
Page 840
840
NTAK79 2.0 Mb PRI card
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
Table 358 "Carrier shield grounding switch settings"
.
Table 358
Carrier shield grounding switch settings
Switch
Carrier Pair
On
Off
S4-1
Rx shield
Open
GND
S4-2
Tx shield
Open
GND
NTAK79 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.
Table 359
Carrier shield grounding switch settings
Switch
Carrier Pair
On
Off
S4-1
Rx shield
Open
GND
S4-2
Tx shield
Open
GND
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
Table 360 "Carrier shield grounding switch settings"
.
Table 360
Carrier shield grounding switch settings
Switch
Carrier Pair
On
Off
S4-1
Rx shield
Open
GND
S4-2
Tx shield
Open
GND
Receiver functions
The receiver extracts data and clock from an AMI (Alternate Mark
Inversion) coded signal and outputs clock and synchronized data. The
receiver is sensitive to signals over the entire range of cable lengths and
requires no equalization. The clock and data recovery meets or exceeds
the jitter specifications of the CCITT recommendation G.823, and the
jitter attenuation requirements of the CCITT recommendation G.742.
This provides jitter attenuation increasing from 0 dB to 60 dB over the
frequency range from about 6 Hz to 6 KHz.
Nortel Communication Server 1000
Circuit Card Reference
NN43001-311
02.06
Standard
27 August 2008
Copyright © 2003-2008 Nortel Networks
.