xe0055cs2 ETC-unknow, xe0055cs2 Datasheet - Page 6

• Manufacturer Part Number: xe0055cs2
• Description: Miniature Telephone Line Interface Module Applications
• Manufacturer: ETC-unknow

When developing a product to be connected to the telephone line, it is necessary to use a circuit known as a Data
Access Arrangement (DAA) approved by the appropriate governmental agency. In the US this agency is the Federal
Communications Commission (FCC), while in Canada it is Industry Canada (IC). 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 XE0055CS2 has been designed to meet all FCC Part 68 requirements for hazardous voltage, line impedance and
leakage current. If the system transmits data, synthesized voice, 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:
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 XE0055CS2 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 XE0055CS2 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 XE0055CS2. 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 XE0055CS2 already complies with FCC Part 68 rules, this is a relatively simple process.
FCC Part 68 Instructions
XECOM
Frequency
3995 Hz
4005 Hz
12 kHz
90 kHz
270 kHz
to
to
to
to
to
Range
4005 Hz
12 kHz
90 kHz
270 kHz
6 MHz
(6)
Max. Power
-27 dBm
-20 dBm
-55 dBm
-55 dBm
-15 dBm
XE0055CS2