XE0092 View Datasheet(PDF) - Unspecified

Part Name

Description

Manufacturer

XE0092

Surface-Mount DAA Module

Unspecified 

Cermetek Microelectronics, Inc

FCC part 68 Information

XE0092 Low-cost DAA Module

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 XE0092 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 XE0092 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 XE0092 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 XE0092. 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 XE0092 already complies with FCC Part 68 rules, this is a relatively simple process.

©2009 Cermetek Microelectronics, Inc.

Page 11

Document No. 607-0100 Revision A (10/09)

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