Datasheet XE0204 Datasheet (XECOM)

Page 1

2-Wire/4-Wire Telephone Line Interface

XE0204

July 2000

Description

The XE0204 provides a common telephone interface for networks integrating two and four-wire telephone connections. The XE0204 supplies two and four wire leased line connections, and complies with FCC Part 68 Rules for 2-wire connections to the public switched network.

The XE0204 supports voice, data and fax transfer at speeds to 14,400 Bits Per Second, V.32bis data transfer over two wires and V.33 data transfer over four wires.

The XE0204 is a complete DAA in a compact package. It includes the telephone line transformers, loop current holding circuit, ring detection, switch hook, two-to-four wire convertor and four-wire switch. The small size of the XE0204, just 1.5 square inches, allows the XE0204 to be used in most any application requiring connection to the telephone network.

Features

* Small Size 0 1.5” x 1.08” 0.42” * FCC Part 68 Compliant * Integral Ring Detection * Integrated Switch Hook * Switchable between two-wire and four-wire lines * Integral two-to-four wire convertor * Integrated telephone line transformers * 1500 volt isolation barrier between the telephone line

and host equipment * Supports both dial-up and leased line applications * Supports 14,400 BPS data transfer; V.32bis (2-wire),

V.33 (4-wire) * Operates on a single +5 Volt supply

* Standard Operating Temperature Range 0C to 70C

Optional operating range, -40C to 85C available

XE0204 Block Diagram

XMIT

RCVR

/4Wire

4 Wire Switch

2 to 4 Wire

Convertor

Telephone

Line

Transformer

Loop Current Holding

Circuit

/RI

Telephone

Line

Transformer

XECOM (1) XE0204

Hook

Switch

Tx Tip

Tx Ring

Ring

Detect

Rx Tip

Rx Ring

Page 2

XE0204 Mechanical Specifications

Inches Millemeters

Dim Min Max Min Max

A 1.480 1.520 37.59 38.61 B 1.060 1.100 26.92 27.94 C 0.420 0.430 10.67 10.92 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 0.290 0.310 7.37 7.87

J 0.090 0.110 2.29 2.79

K 0.020 0.025 0.51 0.64

Denotes Pin 1

XE0204 Pin Configuration

VCC 1 20 TxTip

RCVR 4 17 TxRing

XMIT 5

OH 7 14 RxTip

/4Wire 8

N/C 9 Gnd 10 11 RxRing

G J

XE0204

(Top View)

/RI 3

XECOM (2) XE0204

Page 3

XE0204 Pin Configuration

Pin Name Description

1 VCC VCC supplies +5 Volts power to the XE0204 3 /RI Ring Indicate, output, active low, TTL. /RI indicates the XE0204 is receiving a ring signal. /RI remains

low for the duration of each ring.

4 RCVR RCVR acts as the analog output for signals recevied from the telephone line by the XE0204. In two wire

mode the received signal is placed on RCVR by the 2-to-4 wire convertor. In four wire mode the received signal comes directly from the receive phone line pair.

5 XMIT XMIT provides the analog input to the XE0204 for signals to be transmitted onto the telephone line. In

two wire mode the signal is passed to the 2-to-4 wire convertor. In four wire mode the signal goes directly the transmit phone line pair.

7 OH Hookswitch relay control. A high on OH closes the internal relay and connects the equipment to the

telephone line. OH must be forced high to maintain a 2 wire or 4 wire leased line.

8 /4Wire /4Wire is an active low input to the XE0204 which selects four wire operation. If pin 8 is open or driven

high, two wire mode is selected.

9 N/C No Connection 10 Gnd Gnd provides the ground reference connection to the XE0204. 11 RxRing RxRing provides the Ring connection to the receive pair of the four wire phone line. RxRing is not used

for two wire connections. RxRing has 1500 volts isolation from the rest of the circuitry. This isolation must be preserved throughout the system.

14 RxTip RxTip provides the Tip Connection to the receive pair of the four wire phone line. RxTip is not used for

two wire connections. TxTip has 1500 volts isolation from the rest of the circuitry. This isolation must be preserved throughout the system.

17 TxRing TxRing provides the Ring Connection to two wire lines as well as to the transmit pair of four wire phone

lines. TxRing has 1500 volts isolation from the rest of the circuitry. This isolation must be preserved throughout the system.

20 TxTip TxTip provides the Tip Connection to two wire lines as well as to the transmit pair of four wire phone

lines. TxTip has 1500 volts isolation from the rest of the circuitry. This isolation must be preserved throughout the system.

XECOM (3) XE0204

Page 4

XE0204 Electrical Specifications (VCC= +5V + 10%, Ta = 0C to 70C)

Parameter Conditions Min Typ Max Units

Power Supply Current 4-Wire Operation 10 16 mA

Transmit Insertion loss 2-Wire line, 1000 Hz, 600 Ohm line -0.5 0 0.5 dB

Receive Insertion Loss 2-Wire line, 1000 Hz, 600 ohm line -0.5 0 0.5 dB

4-Wire line, 1000 Hz, 600 ohm line 0.8 3.0 dB

Telephone Line Impedance At 1800 Hz, (2 and 4 wire Lines) 540 6 00 660 Ohms

Coupler Match input Output impedance driving RCVR in four- 531 536 541 Ohms Impedance wire mode

Transmit Input Impedance At 1800 Hz 8 10 12 KOhms

Receive Output Impedance 2 Wire mode, 1800 Hz 10 100 Ohms

Transhybrid Loss 2-wire mode, 1 KHz, 600 ohm line 15 21 dB

Ring Detect Sensitivity T ype B Ringer 38 150 Vrms

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

/4WIRE Switch 2-Wire 4.0 Volts

4-Wire 0.8 Volts

Loop Current, Tx Pair Off-hook 0 100 mA

Loop Current, Rx Pair 4-Wire Line 0 mA

XE0204 Absolute Maximum Ratings

Supply Voltage - VCC +6.5 Volts Storage Temperature -25OC to +85OC Operating Temperature Range 0OC to +70OC Maximum Lead T emperature 260OC

(soldering 2 seconds per wave)

XECOM (4) XE0204

Page 5

XE0204 Typical Connection Diagram for a 2-Wire, Dial-up Line

+5 Volts

XE0204

Modem Analog

Front End RJ11

/Ring

Receive

Transmit

OHRLY

VCC TxTIP

/RI RCVR TxRING XMIT

OH RxTip /4Wire

Gnd RxRing

10 ohms, 1/2 W

P3100SB

10 ohms, 1/2 W

Teccor

FerriteBead

470 pFd

2600 Volts

470 pFd 2600 Volts

XE0204 Typical Connection Diagram for a 2-Wire, Leased Line

4 3

Modem Analog

Front End

/Ring

Receive

Transmit

OHRLY

+5 Volts

XE0204

VCC TxTIP

/RI RCVR TxRING XMIT

OH RxTip /4Wire

Gnd RxRing

10 ohms, 1/2 W

P3100SB

10 ohms, 1/2 W

Teccor

FerriteBead

470 pFd

2600 Volts

RJ11

4 3

470 pFd 2600 Volts

XECOM (5) XE0204

Page 6

XE0204 Typical Connection Diagram for a 4-Wire, Leased Line

+5 Volts

XE0204

Modem Analog

Front End RJ11

/Ring

Receive

Transmit

OHRLY

VCC TxTIP

/RI RCVR TxRING XMIT

OH RxTip /4Wire

Gnd RxRing

10 ohms, 1/2 W

Teccor

P3100SB

Teccor

P3100SB

FerriteBead

470 pFd

2600 Volts

Recommended Parts

Reference Designation Recommended Part Number

Ferrite Beads TDK ACB2012L-120-X

4 3

RJ11

4 3

High Voltage Capacitors Panasonic ECKDRS471, 470 pfd, 2600 Volts

RJ11 Telephone Jack Stewart SS6446NF

XECOM (6) XE0204

Page 7

XE0204 FCC Instructions

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 XE0204 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 XE0204 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 XE0204 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 XE0204. This is generally accomplished through an independent testing lab which tesst the System and submits the proper paperwork to the FCC for approval. Since the X0204 already complies with FCC Part 68 rules, this is a relatively simple proces

XECOM (7) XE0204

Page 8

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 provided 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 reasonably expected to cause failure of the life support device or system, or to affect its safety or effectiveness.

Copyright, Xecom © 2000 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.

Incorporated

Xecom 374 Turquoise Street, Milpitas, CA 95035 Ph:408-945 -6640 Fax:408 -942-1346 Email: info@xecom.com

XECOM (8) XE0204