Timing interface
Purpose
The timing interface provides one external timing output for ITU-T compliant 2048 kHz
timing signals. It does not support timing inputs.
Connector data
The timing output is realized as 8-pin RJ45 connector suitable for symmetrical twisted
pair cables with an impedance of 120 Ω or coaxial cables with an impedance of 75 Ω.
Table 4-7
Pin assignment (timing cable)
Point on
connector
Signal name
(120 Ω, symmetrical)
Signal name
(75 Ω, coaxial)
1
TX positive (a-wire)
Braid of TX coaxial
2
TX negative (b-wire)
nc
3
nc
Inner conductor of TX coaxial
4
nc
nc
5
nc
nc
6
nc
nc
7
GD
GD
8
GD
GD
Cable data (120 Ω, symmetrical)
Preferably a shielded twisted pair cable should be used (22 or 26 AWG).
Cable data (75 Ω, coaxial)
Preferably a MiniCoax 75Ω 2.5 mm cable should be used.
Cable connection
Please connect the timing cable as shown in the figure below:
Figure 4-13 Timing connector
1
8
System cabling
External cable installation
Timing interface
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4-16
Alcatel-Lucent – Internal
Proprietary – Use pursuant to Company instruction
365-313-103R8.0
Issue 2
July 2009
