Panasonic kx-ns0154la Installation Manual page 55

Conditions for Configuring the Air Synchronization
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Master CS2 must be within range of Master CS1.
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It is recommended that Master CSs be placed in the middle of the installation site.
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Both a Primary CS and Secondary CS should be assigned to Slave CSs.
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When using only two CSs on the network (only two CSs are connected to the PBX), make sure that you
do not create a Master CS2.
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All traditional CSs are automatically assigned and fixed as Master CS1.
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When using IP-CSs and traditional CSs in the same area, make sure that you do not create a Master CS2.
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When synchronizing CSs, do not create loops as in the examples below:
[Examples]
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It is recommended that the number of levels in the synchronization hierarchy is minimized for stable air
synchronization. The maximum number of levels is 4.
5 Appendix
Installation Guide 55