XECOM (1) XE0002D
XE0002D
August 2005
Modular DAA with 2/4 Wire Convertor
Description
The XE0002D is a compact DAA module designed
for applications requiring voice, data or fax
transfer. It complies with FCC Part 68 rules for
direct connection to the public switched telephone
network and also supports leased line applications.
The XE0002D provides a complete telephone
interface. It includes the 2/4 wire convertor to
separate transmit and receive signals, ring
detection, integral switch hook and telephone line
transformer. All of this circuitry is integrated into a
module requiring only 1.25 inches of board space.
Features:
Small Size: just 1.25 inches by 1.0 inches by
0.32 inches high
FCC Part 68 Compliant
User selectable 2-4 wire convertor
Active Low Ring Detection
Integral Switch Hook
Supports V.32 Data Transfer
Supports both dial-up and leased line
applications
Extended Operating Temperature Range (-40C
to +85C) available
XE0002D Block Diagram
Jumpers J1 and J2 must be installed to connect the 2 to 4 wire convertor.
Ring DetectRing Detect
Tip
Ring
HookHook--SwitchSwitch
LoopLoop
Current Current
HoldingHolding
Cir cuit Cir cuit
TelephoneTelephone
Line Line
TransformerTransformer
2/42/4--WireWire
ConverterConverter
J1
J2
/OH
XMIT
RCVR
XFMR
T1
T2
/RI
XECOM (2) XE0002D
XE0002D Mechanical Specifications
XE0002D Pin Configuration
VDD 1 20 TIP
VCC 2
/ RI 3 (Top V iew)
RCVR 4 17 RING
XMIT 5
XFMR 6
T1 7 14 N/C
OH 8 13 N/C
Gnd 9 12 N/C
T2 10 11 N/C
Inches Millimeters
Dim Min Max Min Max
A 1.235 1.265 31.37 32.13
B 0.985 1.015 25.02 25.78
C 0.490 0.510 12.45 12.95
D 0.890 0.910 22.61 23.11
E 0.890 0.910 22.61 23.11
F 0.125 - 3.18 -
G 0.040 0.060 1.02 1.52
H 0.165 0.185 4.19 4.70
J 0.090 0.110 2.29 2.79
K 0.020 0.025 0.51 0.64
XECOM (3) XE0002D
XE0002D Pin Descriptions
Pin Name Description
1 VDD VDD supplies -5 Volt power to the XE0002D’s 2 to 4 wire converter.
2 VCC VCC supplies +5 Volts power to the XE0002D
3 /RI Ring Indicate, output, active low , TTL. /RI indicates the XE0002D is receiving a ring
signal. /RI remains low for the duration of each ring.
4 RCVR RCVR acts as the analog output from the XE0002D’s 2 to 4 wire converter. Signals
pass from the telephone line to the host via RCVR
5 XMIT XMIT provides the analog input to the XE0002D’s 2 to 4 wire converter . Signals
placed on XMIT are sent out onto the telephone line.
6 XFMR XFMR is provided to connect the internal 2 to 4 wire converter to the telephone line
transformer. A jumper is required from XFMR to T1 whenever the 2 to 4 wire circuit
is required.
7 T1 T1 is one of two direct connections to the internal telephone line transformer. T1
must be connected to the XE0002D XFMR lead to use the internal 2 to 4 wire
converter. If the 2 to 4 wire converter is not required, Signals for the telephone line
can be passed across T1 and T2.
8 OH Hookswitch relay control. A high on OH closes the internal relay and connects the
equipment to the telephone line.
9 G nd Gnd provides the ground reference connection to the XE0002D.
10 T 2 T2 is one of two direct connections to the internal telephone line transformer. T2
must be connected to Ground to use the internal 2 to 4 wire converter. If the 2 to 4
wire converter is not required, Signals for the telephone line can be passed across T1
and T2.
1 1-14 No Connection
17 Ring Ring is one wire of the two-wire telephone line connection (RJ11 Pin 4). FCC Part
68 Rules require a 1500 volt isolation barrier between the telephone line and all other
circuits. This isolation must be preserved throughout the system. Xecom
recommends 0.100 inch spacing between traces connected to Ring and all other
conductors to preserve this isolation
20 Tip T ip is one wire of the two-wire telephone line connection (RJ11 Pin 3). The
telephone company places a DC "Battery" voltage across Tip and Ring on all public
switched telephone lines. The XE0002D accept this line battery voltage without
regard to its polarity.
XECOM (4) XE0002D
XE0002D Electrical Specifications (VCC = 5V + 10%, Ta = 0 to 70C)
Power Supply Current VCC 10 m A
VDD 4 mA
Transmit Insertion loss 600 Ohm Impedance, 1000 Hz 0 dB
Receive Insertion loss 600 Ohm Impedance, 1000 Hz 0 dB
Line Matching Resistor (Rm) for 600 ohm telephone line 3 40 ohms
Line Impedance At 1000 Hz, Rm equal to 340 ohms 5 4 0 6 0 0 6 6 0 Ohms
without internal 2/4 wire convertor
Transhybrid Loss Attenuation between transmitter input and 10 18 dB
receiver output at 1KHz with 600 ohm
line termination
Transmit Input Impedance At XMIT, 1800 Hz 8 10 12 Kohm
Receive Output Impedance At RCVR, 1800 Hz 10 100 ohms
Ring Detect Sensitivity Min. AC voltage between T ip & Ring 38 Vrms
Type B ringer
Ring Indicate Output Ring Voltage present on Tip and Ring 0.2 0.5 Volts
Hook Switch Control Voltage ON: (off-hook) 4 . 0 Volts
OFF: (on-hook) 0 . 8 Volts
Hook Switch Control Current Off-Hook 0.5 mA
Telephone Line Loop Current Off-Hook 20 100 mA
Parameter Conditions Min Typ Max Units
XE0002D Absolute Maximum Ratings
Storage Temperature -25C to +85C
Operating T emperature Range 0C t o +70C
Maximum Lead Temperature 260OC
(soldering 2 seconds per wave)
XECOM (5) XE0002D
XE0002D Typical Connection Diagram with Internal 2/4 Wire Converter
Modem Analog
Front End
XE0002D
RJ11
4
3
/Ring
Receive
Transmit
OHRLY
+5 Volts
10 ohms, 1/2 W
470 pFd
3000 Volts 470 pFd
3000 Volts
FerriteBead
FerriteBead
Teccor
P3100SC
10 ohms, 1/2 W
-5 Volts
VDD TIP
VCC
/RI
RCVR
XMIT RING
XFMR
T1
OH
Gnd
T2
J1
J2
XE0002D Typical Connection Diagram without Internal 2/4 Wire Converter
XE0002D
RJ11
4
3
GPIO0
RXAN
TXAN
TXAP
RXAP
GPIO1
+5 Volts
10 ohms, 1/2 W
470 pFd
3000 Volts 470 pFd
3000 Volts
FerriteBead
FerriteBead
Teccor
P3100SC
10 ohms, 1/2 W
VDD TIP
VCC
/RI
RCVR
XMIT RING
XFMR
T1
T2
Gnd
/OH
R1
R2
Note:
R1 and R2 each equal one half of the ideal line matching impedance, 170 ohms.
42K
42K
TDK 73M1903
XECOM (6) XE0002D
When developing a product 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 XE0002D 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 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
200Hz to 3990Hz -9 dBm
3990Hz to 4005Hz -27 dBm
4005Hz to 16kHz -16 dBm
8kHz to 94kHz -47 dBm
86kHz to 270kHz -46 dBm
270kHz to 6MHz -6 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 XE0002D 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 XE0002D 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 XE0002D. 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 XE0002D already complies with FCC Part 68 rules, this is a
relatively simple process.
XE0002D FCC Instructions
XECOM (7) XE0002D
Copyright, Xecom © 2005
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.
Terms of Sale
Devices sold by XECOM are covered by the warranty provisions appearing in its Terms of Sale only. XECOM
makes no warranty, express, statutory, implied, or by description regarding the information set forth herein, or
regarding the freedom of the described devices from patent infringement. XECOM makes no warranty of
merchantability or fitness for any purposes. XECOM reserves the right to discontinue production and change
specifications and prices at any time and without notice. This product is intended for use in normal commercial
applications. Applications requiring extended temperature range, unusual environmental requirements, or high
reliability applications, such as military, medical life-support or life-sustaining equipment, are specifically not
recommended without additional processing and authorization by XECOM for such application.
Xecom assumes no responsibility for the use of any circuitry other than circuitry embodied in a Xecom product.
No other circuits, patents, or licenses are implied.
Life Support Policy
Xecom's products are not authorized for use as Critical Components in Life Support Devices or Systems.
Life Support Devices or Systems are devices or systems which, (a) are intended for surgical implant into the body,
or (b) support or sustain life, and whose failure to perform, when properly used in accordance with instructions pro-
vided in the labeling, can be reasonably expected to result in significant injury to the user.
A Critical Component is any component of a life support device or system whose failure to perform can be rea-
sonably expected to cause failure of the life support device or system, or to affect its safety or effectiveness.
Xecom Incorporated
374 Turquoise Street, Milpitas, CA 95035
Ph:408-942-2200 Fax:408-942-1346
Email: info@xecom.com
www.xecom.com