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PDF ( 数据手册 , 数据表 ) XE0002B

零件编号 XE0002B
描述 DAA
制造商 Xecom
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XE0002B 数据手册, 描述, 功能
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XECOM
XE0002B
DAA with 2/4 Wire Hybrid
Description
The XE0002B Data Access Arrangement provides a
'direct connect' telephone line interface. It complies
with FCC Part 68 hazardous voltage, surge and leakage
current specifications. This component may be used as
the direct connect telephone line interface for virtually
any application in which voice or data is to be
transmitted over the public switched telephone network.
The XE0002B provides high voltage isolation,
independent on/off hook control, ring detection circuitry
and a 2 to 4 wire converter hybrid for use in modem
applications. It operated from ±5 volt power supplies
and occupies 1.25 square inches of board space.
Features
• Small Size - 1.25" x 1.0" x 0.5"
• FCC Part 68 Compliant
• Ring Detection
• 2 to 4 Wire Converter
• 1500 Volt Isolation
• 800 Volt Surge Protection
• Hookswitch Control
PIN CONFIGURATION
VDD 1 •
20 TIP
Vcc 2
RI 3
RCVR 4
17 RING
XMIT 5 (Top View)
XMFR 6
T1 7
14 N/C
OH 8
13 N/C
GND 9
12 N/C
T2 10
11 N/C
CAUTION
PINS 17 & 20 HAVE 1500V ISOLATION FROM THE REST OF
THE CIRCUITRY. THIS ISOLATION SHOULD BE
PRESERVED THROUGHOUT THE SYSTEM
Block Diagram







XE0002B pdf, 数据表
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
line.
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:
Frequency
200Hz
3990Hz
4005Hz
8kHz
86kHz
270kHz
to
to
to
to
to
to
Range
3990Hz
4005Hz
16kHz
94kHz
270kHz
6MHz
Max. Power
-9 dBm
-27 dBm
-16 dBm
-47 dBm
-46 dBm
-6 dBm
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
interference.
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.
JACK RJ11C RINGER EQUIVALENCE = 0.9B
REGISTRATION NUMBER DWE6TM - 72963 - WP - E
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 Xecom Incorporated
374 Turquoise Street, Milpitas, CA 95035
Ph:408 -945 -66 40 Fax: 408 - 942-1346
8/XECOM
XE0002B














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