xe0002b ETC-unknow, xe0002b Datasheet - Page 8

• Manufacturer Part Number: xe0002b
• Description: Daa With 2/4 Wire Hybrid
• Manufacturer: ETC-unknow

8/XECOM
Telephone Line Connection Information
When developing a product that is 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
l i n e .
The XE0002B 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 from the XE0002B meet basic 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:
For modem applications, the out of band energy limit is normally ensured by the transmit filter in the modem circuitry.
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 XE0002B is taken “off hook” and before any data is transmitted.
This is required to ensure that billing information may be exchanged between telephone company central offices without
i n t e r f e r e n c e .
The user of the XE0002B 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 that is provided by the XE0002B. This is generally accomplished through an
independent testing lab which will test the System and submits the proper paperwork to the FCC for approval. Since the
XE0002B already complies with FCC Part 68 rules, this is a relatively simple process.
Copyright, Xecom © 1991
While Xecom, Inc. has made every effort to ensure that the information presented here is accurate, Xecom will not be liable for
any damages arising from errors or omission of fact. Xecom reserves the right to modify specifications and/or prices without
notice. Product mentioned herein are used for identification purposes only and may be trademarks and/or registered
trademarks of their respective companies.
XECOM
X e com Incorporated
374 Turquoise Str eet , Mi lpitas, CA 95035
Ph:408 -945 -66 40 Fax: 4 08 - 94 2 - 1 346
REGISTRATION NUMBER DWE6TM - 72963 - WP - E
F r e q u e n c y
2 0 0 H z
3 9 9 0 H z
4 0 0 5 H z
8 k H z
8 6 k H z
2 7 0 k H z
JACK RJ11C
t o
t o
t o
t o
t o
t o
RINGER EQUIVALENCE = 0.9B
R a n g e
3 9 9 0 H z
4 0 0 5 H z
1 6 k H z
9 4 k H z
2 7 0 k H z
6 M H z
Max. Power
-9 dBm
-27 dBm
-16 dBm
-47 dBm
-46 dBm
-6 dBm
XE0002B