3Com V7111 - Manual (Page 62)

FXO Only: The Ringer Equivalence Number (REN) for this terminal is 0.5. The REN
assigned to each terminal equipment 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
Ringer Equivalence Number of all devices do not exceed five.
Network Compatibility
The products support the Telecom networks in EU that comply with TBR21 .
Telecommunication Safety
The safety status of each port is declared and detailed in the table below:
Ports Safety Status
Ethernet (100 Base-T) SELV
FXO TNV-3
TNV-3: Circuit whose normal operating voltages exceeds the limits for an SELV circuit under
normal operating conditions and on which over voltages from Telecommunication Networks
are possible.
SELV: Safety extra low voltage circuit.
MP-1xx FXO Notice
The V7111 FXO Output Tones and DTMF level should not exceed -9 dBm (3Com setting
#23) in order to comply with FCC 68, TIA/EIA/IS-968 and TBR-21.
The maximum allowed gain between any 2 ports connected to the PSTN should be set to 0
dB in order to comply with FCC 68, TIA/EIA/IS-968 Signal power limitation
FCC Statement
This equipment has been tested and found to comply with the limits for a Class B digital
device, pursuant to part 15 of the FCC Rules. These limits are designed to provide
reasonable protection against harmful interference in a residential installation. This
equipment generates, uses and can radiate radio frequency energy and, if not installed and
used in accordance with the instructions, may cause harmful interference to radio
communications. However there is no guarantee that interference will not occur in a
particular installation. If this equipment does cause harmful interference to radio or television
reception, which can be determined by turning the equipment off and on, the user is
encouraged to try to correct the interference by one or more of the following measures:
ƒ Reorient or relocate the receiving antenna.
ƒ Increase the separation between the equipment and receiver.
62 3Com VCX V7111 Analog Gateway Installation Guide