ote:
•
When 75 Ω connections are used, the outer conductor of the coaxial pair must be
connected to earth.
•
When 120 Ω connections are used, the screen of the symmetrical pair must be
connected to earth.
•
The frequency deviation from nominal of the input signal shall be less than 4.6
ppm.
The station clock input provides tolerance for sinusoidal phase variations as specified in
the following table:
Table 4-6
Jitter tolerance at 30 channel market station clock inputs
Peak-peak amplitude
Frequency range
250 ns
1-20 Hz
5000/f ns (f in Hz)
20-50 Hz
100 ns
50-100 kHz
Point on connector
Signal name
(120 Ω, symmetrical)
Signal name
(75 Ω, coaxial)
1
nc
nc
2
nc
nc
3
nc
nc
4
RX positive (a-wire)
Braid of RX coaxial
5
RX negative (b-wire)
nc
6
nc
Inner conductor of RX
coaxial
7
GD
GD
8
GD
GD
System cabling
External cable installation
Synchronization interface
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365-313-103R8.0
Issue 2
July 2009
Alcatel-Lucent – Internal
Proprietary – Use pursuant to Company instruction
4-15
