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SpectraLink 6100 MCU: Installation and Operation: SpectraLink 6000 System 
PN: 1725-36097-001_J.doc 
32 
No more than 15 units may be grounded through one connection to 
the protective earth ground.  Systems involving more than 15 units 
must be broken up into groups of 15 or fewer units with each group 
provided with an independent protective earthing conductor. 
Connect MCU to demarc blocks 
Connect the male RJ-21 connector from the appropriate demarcation 
block to the designated RJ-21 connector (
A
 or 
B
) on each MCU. Secure 
the cables using the keeper. 
Connect multi-unit systems 
Use the following procedure to connect multiple MCUs. 
1.  Mount the MCUs side by side.  
2.  Connect the IPC cable from the 
OUT
 port of the first unit to the 
IN
 
port of the adjacent unit. Repeat until all units are connected, as 
shown in the following illustration.