XE014JS 查看數據表（PDF） - Xecom

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XE014JS

PLCC DAA for Shared-Line Applications

Xecom 

Telephone Line Connection Information

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 XE014JS 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:

Frequency

Range Max. Power

3995 Hz to 4005 Hz -27 dBm

4005 Hz to 12 kHz -20 dBm

12 kHz to 90 kHz -55 dBm

90 kHz to 270 kHz -55 dBm

270 kHz to 6 MHz -15 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 XE014JS 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.

OEM’s using the XE014JS 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 XE014JS. 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 XE014JS already complies with FCC Part 68 rules, this is a relatively simple process.

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XE014JS

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