XE0002D 查看數據表（PDF） - Xecom
零件编号
产品描述 (功能)
生产厂家
XE0002D Datasheet PDF : 7 Pages
| |||
XE0002D FCC Instructions
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 XE0002D has been 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 transmitted meet basic FCC requirements for maximum
transmission levels, 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 XE0002D 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 XE0002D 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 XE0002D. This is
generally accomplished through an independent testing lab which tests the System and submits the proper
paperwork to the FCC for approval. Since the XE0002D already complies with FCC Part 68 rules, this is a
relatively simple process.
XECOM
(6)
XE0002D
Share Link: 