User`s guide

Cayman 3220-H User’s Guide Technical Specifications
December 2000 A-5
Notice
The Ringer Equivalence Number (REN) assigned to each terminal
device provides an indication of the maximum number of terminals
allowed to be connected to a telephone interface. The termination
on an interface may consist of any combination of devices subject
only to the requirement that the sum of the Ringer Equivalence
Numbers of all the devices does not exceed five (5).