HP Color LaserJet Enterprise CM4540 MFP series - Manual (Page 374)

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 Number of all the devices does not exceed five (5.0). The standard
connecting arrangement code (telephone jack type) for equipment with direct connections to the
telephone network is CA11A.
Japan Telecom Mark
A08-0138004
354 Appendix D Regulatory information ENWW