NEC NEC-80570 User Guide - Page 10

Single Line Telephone REN Limitations, Installation Basics

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System Preparation and Configuration Single Line Telephone REN Limitations Please note the following when installing single line telephones: q The total Ringer Equivalence Number (REN) per system cannot exceed 4. q The total REN per analog port cannot exceed 4. q Ringer Equivalence is cumulative. By default, all analog telephones ring simultaneously for outside calls (as do all analog telephones connected to the same port). This means you must add up all analog telephones connected to the system (including all those connected to the same port) and ensure that the total combined REN is 4 or less. Note: A REN of 1 is the normal for an industry standard 2500 set with electromechanical ringer. Many phones with electronic ringers have significantly lower RENs. 1-4 x Section 1: Installation Basics DS1000 Hardware Manual

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System Preparation and Configuration
1-4
◆
Section 1: Installation Basics
DS1000 Hardware Manual
Single Line Telephone REN Limitations
Please note the following when installing single line telephones:
●
The total Ringer Equivalence Number (REN) per system cannot exceed 4.
●
The total REN per analog port cannot exceed 4.
●
Ringer Equivalence is cumulative.
By default, all analog telephones ring simultaneously for outside calls (as do all analog telephones con-
nected to the same port). This means you must add up all analog telephones connected to the system (includ-
ing all those connected to the same port) and ensure that the total combined REN is 4 or less.
Note:
A REN of 1 is the normal for an industry standard 2500 set with electromechanical ringer. Many
phones with electronic ringers have significantly lower RENs.