Version 5.6  23  November 2008 
Installation Manual   2. Installing the Device 
 
 
AudioCodes recommends using a surge protector such as CIRCA 4B1FS-240 of 
CircaTelecom (http://www.circatelecom.com) and a building entrance terminal fixture (e.g., 
CIRCA 2625QC/QC).  
Alternative surge protectors should meet the following specifications: 
  Technology: Solid State 
  Breaking Voltage: 230V 
  Response Time: < 1 nanosecond 
¾  To connect MP-124 to a surge protector, take these 2 steps: 
1.  Mount the MP-124 as close as possible (less than 24 inches / 61 cm) to the surge 
protector chassis and connect the device's earthing screw to the surge protector's 
chassis ground hole, using a 14-AWG (minimum) wire. 
Figure  2-15: MP-124 Wiring Using Earthing Screw on Rear Panel