• MP-124 Rev. D:
Warning: For MP-124 Rev. D, routing of FXS telephony cables outdoors can be done
only in conjunction with AudioCodes’ approved surge protector (Circa model 4B3S-75)
and proper installation and grounding. When done correctly, the installation will meet
ITU-T K.21 (basic) standards. For more information, see Section 5.1.1 on page 20.
Figure 5-9: Connecting MP-124 Rev. D to FXS Patch Panel