XE0055T2 Ver la hoja de datos (PDF) - Xecom
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XE0055T2 Datasheet PDF : 8 Pages
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Telephone Line Connection Information
When developing a product to be connected to the telephone line, it is necessary to use a circuit
described as a Data Access Arrangement (DAA) which is approved by the appropriate
governmental agency. In the US, for example, this agency is the Federal Communications
Commission (FCC), while in Canada it is the Department of Communications (DOC). These
agencies test and approve the product to ensure that it meets their specifications, thereby
protecting the telephone system from damage and protecting the user from high voltage transients
(such as lightning strikes) which may come down the telephone line.
The XE0055S and XE0055T were designed to meet all FCC Part 68 requirements for hazardous
voltage, surge protection and leakage current. If the system developed transmits data, or DTMF
tones on the telephone line, the user must certify that the signals transmit 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 Part 68 of the FCC 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
6MHz
-6 dBm
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 the time the XE0055S or XE0055T is taken “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 user of the XE0055S or XE0055T 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 isolation
provided by the DAA module. This is generally accomplished through an independent testing lab
which test the System and submits the proper paperwork to the FCC for approval. Since the
XE0055S and XE0055T already comply with FCC Part 68 rules, this is a relatively simple process.
7/XECOM
XE0055S&T
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