Nortel Circuit Card 311 Reference page 913

Table 373
System clock specification and characteristics
Specifications
Base Frequency
Accuracy
Operating Temperature
Drift Rate (Aging)
Tuning Range (minimum)
Input Voltage Range
Since the accuracy requirements for CCITT and EIA Stratum 3ND are so
different, it is necessary to have two TCVCXO which feature different values
of frequency tuning sensitivity.
Table 374
System clock specification and characteristics
Specifications
Base Frequency
Accuracy
Operating Temperature
Drift Rate (Aging)
Tuning Range (minimum)
Input Voltage Range
Since the accuracy requirements for CCITT and EIA Stratum 3 are different,
it is necessary to have two TCVCXOs which feature different values of
frequency tuning sensitivity.
Table 375
System clock specification and characteristics
Specifications
Base Frequency
Accuracy
Operating Temperature
Drift Rate (Aging)
Copyright © 2003-2008, Nortel Networks
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CCITT
20.48 MHz
±3 ppm
0 to 70 C ±1 ppm
±1 ppm per year
±60 ppm min.
±90 ppm max.
0 to 10 volts, 5V center
CCITT
20.48 MHz
±3 ppm
0 to 70 C ±1 ppm
±1 ppm per year
±60 ppm min.
±90 ppm max.
0 to 10 volts, 5V center
CCITT
20.48 MHz
±3 ppm
0 to 70 C ±1 ppm
±1 ppm per year
Nortel Communication Server 1000
Circuit Card Reference
NN43001-311 01.04 Standard
Release 5.0 23 May 2008
Functional description 913
EIA
20.48 MHz
±1 ppm
0 to 70 C ±1 ppm
±4 ppm in 20 years
±10 ppm min.
±15 ppm max.
0 to 10 volts, 5V center
EIA
20.48 MHz
±1 ppm
0 to 70 C ±1 ppm
±4 ppm in 20 years
±10 ppm min.
±15 ppm max.
0 to 10 volts, 5V center
EIA
20.48 MHz
±1 ppm
0 to 70 C ±1 ppm
±4 ppm in 20 years