XE1000 データシートの表示（PDF） - Xecom
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XE1000 Datasheet PDF : 8 Pages
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US Telephone Line Connection Information
The following information describes the requirements for connecting equipment to the telephone network in
the United States. For similar information for other countries contact the regulatory agency in that country.
When developing a product to be connected to the telephone line, it is necessary for the equipment to be
approved by the appropriate governmental agency. In the US this agency is the Federal Communications
Commission (FCC). The FCC evaluates the product to ensure it meets all specifications, thereby
protecting the telephone system from damage and the user from high voltage transients (such as lightning
strikes) on the telephone line. The DAA performs an essential function in meeting these requirements.
The XE1000 meets or exceeds all FCC Part 68 requirements for hazardous voltage, surge protection and
leakage current. If the system transmits data, or DTMF tones on the telephone line, the user must meet
basic FCC requirements for maximum transmission levels of out of band energy and billing delay. Full
details may be obtained from the FCC under FCC Part 68 Rules and Regulations, or in Title 47 of the Code
of Federal Regulations, however the basic requirements are as follows:
1. Maximum Transmit Level
For the normal “permissive” (standard) telephone line, equipment which transmits data (such as a modem)
must not exceed a transmission level of -9 dBm.
2. Out of Band Energy
Data equipment must not transmit “out of band” energy on the telephone line which exceeds the following
limits:
Frequency Range
Max. Power
200Hz to 3990Hz -9 dBm
3990Hz to 4005Hz -27 dBm
4005Hz to 16kHz -16 dBm
8kHz
to 94kHz -47 dBm
86kHz
to 270kHz -46 dBm
270kHz to 6MH
-6 dBm
For modem applications, the out of band energy limit is normally ensured by the transmit filter in the modem
circuitry.
3. DTMF Transmission Level
If the system is capable of DTMF dialing, the maximum DTMF transmission level must be less than 0 dBm
averaged over a 3 second interval.
4. Billing Delay
A delay of 2 seconds or greater is required after “off hook” and before any information is transmitted. This
is required to ensure that billing information may be exchanged between telephone company central offices
without interference.
The XE1000 user must certify to the FCC that the final system meets the requirements of Part 68 which
include the criteria above as well as the high voltage protection provided by the DAA. This is generally
accomplished through an independent testing lab which tests the System and submits the proper
paperwork to the FCC for approval.
XECOM
(7)
XE1000
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