Alcatel-Lucent 1643 AMS Installation Manual page 121

System cabling
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.
Figure 4-22 Timing connector
1
Table 4-7
Point on
Connector
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.
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365-312-802R7.2
Issue 4, June 2007
8
Pin assignment (timing cable)
(120 Ω, symmetrical)
1 TX positive (a-wire)
2 TX negative (b-wire)
3 nc
4 nc
5 nc
6 nc
7 GND
8 GND
Alcatel-Lucent - Proprietary
See notice on first page
Signal Name Signal Name
(75 Ω, coaxial)
Braid of TX coaxial
nc
Inner conductor of TX coaxial
nc
nc
nc
GND
GND
4-23