HP CM1312 MFP Series - Manual (Page 259)

cause to request the user to disconnect the equipment. Users should ensure for their own protection
that the electrical ground connections of the power utility, telephone lines, and internal metallic water
pipe system, if present, are connected together. This precaution can be particularly important in rural
areas.
CAUTION: Users should not attempt to make such connections themselves, but should contact the
appropriate electric inspection authority, or electrician, as appropriate. The Ringer Equivalence Number
(REN) of this device is 0.7.
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.
ENWW Additional statements for telecom (fax) products 247