XE0052S &XE0052T
Slim V.34 Telephone Line Interface with 2/4 Wire Hybrid
5/99
Description
The XE0052S and XE0052T are compact telephone interface modules which support V.34 communications at
data rates to 33,600 bps yet are just 0.31 inches thick
and comply with FCC Part 68 Rules for connection to
the public telephone network.
The XE0052S and XE0052T are complete DAAs.
They include the 2-4 wire convertor to separate transmit and receive signals, ring detection, and the switch
hook to control line access. The two models differ only
in their RI outputs. The XE0052S has an integrated RI
output which remains low for the duration of the ring.
The XE0052T RI output is not integrated and provides
a pulse train at twice the ring frequency.
Xecom offers two mechanical variations for each of the
XE0052S and XE0052T. The XE0052S1/T1 mount
vertically to consume minimal board space. The
XE0052S2/T2 mount horizontally to maintain a low
profile. Both versions are electrically identical and
share the same pin configuration.
Features
* Small Size: just 1.5" by 0.5" by 0.32";
* FCC Part 68 Compliant;
* Internal 2-4 wire convertor separates transmit and
receive signals
* Two Ring Detect Options;
XE0052S1/S2: - Continuous Low Level
XE0052T1/T2 - Ring Signal Pulses
* Single +5V Operation;
* Hookswitch Control
* Compatible with V.34 data transfer
* Two Mechanical Variations
XE0052S1/T1 - Vertical Mount
XE0052S2/T2 - Horizontal Mount
XE0052 Block Diagram
Tx
Rx
OH
RI
2 TO 4
WIRE
CONVERTER
SURGE
AND
PROTECTIVE
NETWORK
LINE
CURRENT
CIRCUIT
HOOK-
SWITCH
CONTROL
RING
DETECT
CIRCUIT
XECOM (1) XE0052
TIP
RING
XE0052S1 and XE0052T1 Mechanical Specifications
Pin 1
Vertical Package
C
F
G
F
E
Inches Millimeters
Dim Min Max Min Max
A
B
Pin 1
H
D
A 0.300 0.320 7.62 8.13
B 0.490 0.510 12.45 12.95
C 1.490 1.510 37.85 38.35
D 0.040 0.060 1.02 1.52
E 1.390 1.410 35.31 35.81
F 0.090 0.110 2.29 2.79
G 0.790 0.810 20.07 20.57
H 0.125 0.200 3.18 5.08
XECOM (2) XE0052
XE0052S2 and XE0052T2 Mechanical Specifications
Pin 1
Horizontal Package
C
F
G
F
E
Inches Millimeters
Dim Min Max Min Max
A 0.490 0.510 12.45 12.95
B 0.320 0.330 8.13 8.38
C 1.490 1.510 37.85 38.35
D 0.040 0.060 1.02 1.52
E 1.390 1.410 35.31 35.81
F 0.090 0.110 2.29 2.79
G 0.790 0.810 20.07 20.57
H 0.125 0.200 3.18 5.08
I 0.440 0.450 11.18 11.43
B
H
D
A
Pin 1
I
XE0052 Pin Configuration (Top view)
87654 3 21
OOOOO O OO
/RI RX VCC Gnd TX OH Tip Ring
XECOM (3) XE0052
XE0052 Pin Descriptions
Pin Name I/O Description
1 Ring --- Ring connection to the phone line (RJ1 1 Pin 4). The Ring pin has 1500 volts isolation
from the rest of the circuitry . This isolation must be preserved throughout the system.
2 Tip --- Tip Connection to the phone line (RJ11 Pin 3). The Tip pin has 1500 volts isolation
from the rest of the circuitry . This isolation must be preserved throughout the system.
3 OH I Hookswitch relay control. A high on OH closes the internal relay and connects the
equipment to the telephone line.
4 TX I TX provides the analog input signal to the 2-4 wire convertor of the XE0052S. TX
uses a 2.5 volt reference signal and therefore must be capacitively coupled to the host
equipment.
5 GND -- Ground
6 VCC --- +5 Volts supply power
7 RX O RX provides the analog output signal from the 2-4 wire converter of the XE0052S. RX
uses a 2.5 volt reference signal and therefore must be capacitively coupled to the host
equipment.
8 /RI O Ring Indicate, output, active low, TTL. On the XE0052S a low on /RI indicates the
modem is receiving a ring signal. The XE0052T provides a pulse string at twice the
ring frequency when a ring is detected.
XE0052 Absolute Maximum Ratings
Storage Temperature -25OC to +85OC
Operating Temperature Range 0OC to +70OC
Maximum Lead T emperature 260OC
(soldering 2 seconds per wave)
XECOM (4) XE0052
XE0052 Electrical Specifications (VCC = 5V + 10%, Ta = 0 to 70C)
Parameter Conditions Min Typ Max Units
Power Supply Current Ring Indicate Active 10 15 mA
Transmit Insertion loss 600 Ohm Impedence, 1000 Hz 0 d B
Receive Insertion loss 600 Ohm Impedance, 1000 Hz 0 dB
Line Impedance At 1000 Hz 540 600 660 Ohms
Transhybrid Loss Attenuation between transmiter input and 10 18 dB
receiver output at 1KHz with 600 ohm
line termination
Ring Detect Sensitivity Min. AC voltage between Tip & Ring 38 Vrms
Type B ringer
Ring Detect Peak Current Ringing voltage of 40 Vrms applied 100 uA
between Tip & Ring
Ring Detect Idle Current No Ringing Voltage present 10 uA
Ring Indicate Output Ring Voltage present on Tip and Ring 0.2 0.5 Volts
Loop Current Switch ON: (off-hook) 2.0 3.0 Volts
Control Voltage OFF: (on-hook) 0.2 0.5 Volts
Loop Current Switch Off-Hook 0.5 mA
Control Current
XE0052 Typical Connection Diagram
+5 Volts
Modem Analog
Front End
/Ring
Receive
10 mFd
Transmit
10 mFd
OHRLY
XE0052S or XE0052T
/RI Rx Vcc Gnd Tx OH Tip Ring
876543 2 1
10 ohms, 1/2 W
FerriteBead
Teccor
P3100SB
FerriteBead
10 ohms, 1/2 W
470 pFd
3000 Volts
RJ11
4
3
470 pFd
3000 Volts
XECOM (5) XE0052
XE0052 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 XE0052 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 XE0052 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 XE0052 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 XE0052. 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 XE0052 already complies
with FCC Part 68 rules, this is a relatively simple process.
XECOM (6) XE0052
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 © 1999
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 (7) XE0052
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