xe0020 ETC-unknow, xe0020 Datasheet - Page 5

• Manufacturer Part Number: xe0020
• Description: Telephone Line Interface With Active Line Monitoring
• Manufacturer: ETC-unknow

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 Industry Canada.
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 XE0020 has been designed to meet 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 certify that these
transmitted signals meet 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:
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 XE0020 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 XE0020 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 XE0020. 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 XE0020 already complies with FCC Part 68 rules, this is a relatively simple proces
Telephone Line Connection Information
XECOM
Frequency
200Hz
3990Hz
4005Hz
8kHz
86kHz
270kHz
to
to
to
to
to
to
Range
3990Hz
4005Hz
16kHz
94kHz
270kHz
6MHz
(5)
Max. Power
-9 dBm
-27 dBm
-16 dBm
-47 dBm
-46 dBm
-6 dBm
XE0020
s.