Timing interface
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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
4nc nc
5nc nc
6nc nc
7 GND GND
8 GND GND
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 4-22 Timing connector
1
8
System cabling
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365-312-802R7.2
Issue 4, June 2007
Alcatel-Lucent - Proprietary
See notice on first page
4-23
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