Zte ZXA10 S300, Техническое руководство

Страница: 57 / 102

Chapter 2 Technical Indexes
Confidential and Proprietary Information of ZTE CORPORATION 45
Timing and Synchronization
Function and Performance
Indexes
Timing and synchronization function and performance indexes
contain:
„
Frequency Accuracy
„
Frequency Capture and Out-of-lock Range
„
Synchronization Clock Source
„
Switching of Reference Clock
„
Output of Timing Reference
„
Some Electrical and Physical Features of Timing Interfaces
„
Wander and Jitter Indexes of Timing Reference Interface
„
Timing Interface Extension Function
„
Number of Clock Concatenations
Frequency Accuracy
The output frequency accuracy during the free run of the NE
clock is better than +4.6
× 10
-6
.
The frequency stability in the holdover mode is: Frequency
deviation
≤ 0.37 × 10
− 6
. (20 ∼ 30 ° C) 24 hours.
Frequency Capture and Out-of-lock
Range
The minimum frequency capture and out-of-lock range are: ± 4.6
× 10
-6
.
Synchronization Clock Source
It can be obtained from the following types of input:
„
2,048 kHz synchronization clock input and 2,048 kbit/s
synchronization clock input. 2,048 kbit/s is preferred as the
default upon power-on. The 2,048 kbit/s synchronization
clock signal complies with Recommendation G.704.
„
Recover timing from the STM-N signals.