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5.3 ENVIRONMENTAL LIMITATIONS . . . . . . . . . . . . . . . . . . . . . . . 1-8
5.4 CABLE REQUIREMENTS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-8
5.5 SYSTEM TONES AND RINGS . . . . . . . . . . . . . . . . . . . . . . . . . 1-9
5.6 KEYSET LED INDICATIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-10
NX-SERIES HYBRID KEY SYSTEM GENERAL DESCRIPTION SECTION