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