Pitney Bowes DM125 - Manual (Page 5)

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Industry Canada
This product meets the applicable Industry Canada technical specifications.
The Ringer Equivalence Number (REN) is an indication of the maximum
number of devices allowed to be connected to a telephone interface. The
Ringer Equivalence Number (REN) of this terminal equipment is 1.0. The
termination on an interface may consist of any combination of devices sub-
ject only to the requirement that the sum of the RENs of all devices does not
exceed five.
The abbreviation, IC, before the registration number signifies that registration
was performed based on a Declaration of Conformity indicating that Industry
Canada technical specifications were met. It does not imply that Industry
Canada approved the equipment.