Nortel Networks M3310 - Manual (Page 244)

244 Digital Telephone IP Adapter Installation and Administration Guide
Safety and regulatory information Standard 2.1
Electromagnetic immunity
The Digital Telephone IP Adapter units resist electromagnetic interference.
The Digital Telephone IP Adapter units perform correctly when subjected to
narrow band radiated fields in frequency range 500 kHz to 1 GHz (field strength
up to 10 V/m, 1 kHz, 50% modulated AM signal) per IEC 1000-4-3.