NEC MOBILEPRO 780 User Manual page 175

Note:
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 5."
(For Canadian Use Only)
This Class B digital apparatus meets all requirements of the Canadian
Interference-Causing Equipment Regulations.
Cet appareil numérique de la classe B repecte toutes les exigences du
Règlement sur le matériel brouilleur du Canada.
FCC WARNING
Changes or modifications not expressly approved by the party responsible
for compliance could void the user's authority to operate the equipment.
Properly shielded and grounded cables and connectors must be used for
connection to host computer and/or peripherals in order to meet FCC
emission limits.
AC adapter with ferrite core must be used for RF interference suppression.