FP PostBase Guide D'utilisation page 49

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Appendix – External USB modem (optional)
49
External USB modem
(optional)
USB Modem 51.0052.3147.00:
This Class B digital apparatus complies with Canadian ICES-003.
This product meets the applicable Industry Canada technical specifications.
The RINGER EQUIVALENCE NUMBER (REN) for the USB modem is 0.006.
The Ringer Equivalence Number (REN) is an indication of the maximum number of
devices allowed to be connected to a telephone interface.
The termination of an interface may consist of any combination of devices subject
only to the requirement that the sum of the RENs of all the devices not exceed five.