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System cabling
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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.
Figure 4-13 Timing connector
1
Table 4-7
Point on
connector
Cable data (120 , symmetrical)
Preferably a shielded twisted pair cable should be used (22 or 26 AWG).
Cable data (75 , 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:
...................................................................................................................................................................................................................................
4-16
8
Pin assignment (timing cable)
(120 , symmetrical)
1
TX positive (a-wire)
2
TX negative (b-wire)
3
nc
4
nc
5
nc
6
nc
7
G D
8
G D
Alcatel-Lucent – Internal
Proprietary – Use pursuant to Company instruction
Signal name
External cable installation
Timing interface
Signal name
(75 , coaxial)
Braid of TX coaxial
nc
Inner conductor of TX coaxial
nc
nc
nc
G D
G D
Issue 2 July 2009
365-313-103R8.0
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