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Minature V.34 Telephone Line Interface
XE0055S & XE0055T
1-11-96
Features
* Small Size:
XE0055S1/T1 1.5" by 0.5" by 0.280";
XE0055S2/T2 1.5" by 0.5" by 0.230";
* V.34 compatible for data transfer to
28,800 bps;
* FCC Part 68 Compliant;
* Pin compatible replacement for Xecom's
XE0054SIP
* Ring Detection;
* Single Power Supply, 3 to 5 Volts;
* Hookswitch Control
* Two Mechanical Variations
XE0055S1/T1 Vertical Mount
XE0055S2/T2 - Horizontal Mount
Description
The XE0055S and XE0055T are very slim
telephone interface modules. They support
V.34 communications at 28,800 bps, yet are
no more than 0.290 inches thick and comply
with FCC Part 68 Rules for connection to the
public telephone network.
The XE0055S and XE0055T differ only in
their Ring Indicate outputs. The XE0055S
provides an integrated RI output. It remains
low while ring is present. The XE0055T's RI
output is not integrated. It provides a pulse
train at twice the ring frequency.
Xecom offers two mechanical variations of
the XE0055S and XE0055T. The XE0055S1
and XE0055T1 mount vertically to consume
minimal board space. The XE0055S2 and
XE0055T2 mount horizontally for
the lowest possible profile. Both
versions have the same pin out and
are electrically identical.
The XE0055S operates from a
single power supply from +3 to +5
Volts. As with all Xecom telephone
interface modules, internal ring
indication and switch hook are
provided.
xecom
Block Diagram
XE0055S & XE0055T
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Mechanical Specifications
XE0055S&T XECOM/2
A 0.270 0.290 6.86 7.37
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 4.19 5.08
I 0.260 0.280 6.60 7.11
Inches Millimeters
Dim Min Max Min Max
XE0055S1 & XE0055T1
A 0.490 0.510 12.45 12.95
B 0.225 0.235 5.72 5.97
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 0.460 11.18 11.68
Inches Millimeters
Dim Min Max Min Max
XE0055S2 & XE0055T2
Pin Size: 0.025" by 0.025"
Recommended hole size: 0.056"
Pin Size: 0.025" by 0.025"
Recommended hole size: 0.056"
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3/XECOM XE0055S&T
Pin Descriptions
Pin Name Description
1 Ring Ring is one of two signals which form
the telephone network connection
(RJ11 Pin 4). This device is not
sensitive to the polarity of the battery
voltage on the telephone line. Ring
has 1500 volts isolation from the rest
of the circuitry. This isolation must
be preserved throughout the system.
2 Tip Tip provides the second connection
to the telephone network (RJ11 Pin
3). Tip has 1500 volts isolation from
the rest of the circuitry. This isolation
must be preserved throughout the
system.
3 OH Hook-switch relay control. A high on
OH closes the internal relay and
connects the equipment to the
telephone line.
4 T1 T1 connects directly to the secondary side of the XE0055S telephone line
transformer.
5 GND This signal is used as common reference for all of the control signals in the
XE0055S. Signals on T1 and T2 are not referenced to ground.
6 VCC VCC provides the power source for the hook-switch control. The XE0055S
will operate with VCC equal to 3 to 5 volts
7 T2 T2 connects directly to the secondary side of the telephone line transformer of
the XE0055S
8 /RI Ring Indicate, output, active low TTL. Ri goes low on the XE0055S with each
ring and remains low as long as the ring is present on the telephone line.
The XE0055T RI output provides a pulse at twice the Ring Frequency.
1 o
2 o
3 o
4 o
5 o
6 o
7 o
8 o
PIN CONFIGURATION
XE0055S & XE0055T
Ring
Tip
OH
T1
Gnd
VCC
T2
/RI
(top view)
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Electrical Specification(Vcc=+3v , Ta=0 to 70 deg C)
Power Supply Current Off Hook 6 10 mA
Transmit Insertion loss 600 Ohm Impedence, 1000 Hz 1.7 2.7 3.7 dB
Receive Insertion loss 600 Ohm Impedance, 1000 Hz 1.7 2.7 3.7 dB
Line Impedance At 1000 Hz, Rm 590 ohms 540 600 660 Ohms
Coupler Match Input impedence to T1 & T2 336 340 344 Ohms
input impedence
Ring Detect Min. AC voltage between Tip & 38 150 Vrms
Sensitivity (on-hook) Ring Type B ringer
Ring Detect Ringing voltage of 40 Vrms 100 uA
Peak Current applied between Tip & Ring
Ring Detect No Ringing Voltage present 10 uA
Idle Current
Ring Indicate Output Ring Voltage present on Tip 0.2 0.5 Volts
Voltage & Ring
Loop Current Switch ON: (off-hook) 2.0 2.5 Volts
Control Voltage OFF: (on-hook) 0.2 0.5 Volts
Loop Current Switch 15 25 mA
Control Current
Loop Current Off-Hook current draw from 20 100 mA
Telephone Line
Total Harmonic At 1800 Hz, -9 dBm signal level -72 -76 dBm
Distortion
Parameter Conditions Min Typ Max Units
XE0055S&T XECOM/4
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ABSOLUTE MAXIMUM RATINGS
Storage Temperature -25OC to +85OC
Operating Temperature Range 0OC to +70OC
Maximum Lead Temperature 260OC
(soldering 2 seconds per wave)
5/XECOM XE0055S&T
XE0055S Typical Connection Diagram
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XE0055S &T XECOM/6
Converting from XE0054SIP to XE0055S
Application Note
The schematic above shows the only change required to convert from an XE0054SIP to the
XE0055S. The value of Rm (impedance matching resistor) must be changed from 536 ohms
to 340 ohms.
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Telephone Line Connection Information
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 XE0055S and XE0055T were 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 transmit 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 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 XE0055S or XE0055T 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 XE0055S or XE0055T 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 isolation
provided by the DAA module. This is generally accomplished through an independent testing lab
which test the System and submits the proper paperwork to the FCC for approval. Since the
XE0055S and XE0055T already comply with FCC Part 68 rules, this is a relatively simple process.
7/XECOM XE0055S&T
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Copyright, Xecom © 1996
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.
X e com Incorporated
374 Turquoise Str eet ,Mi lpitas, CA 95035
Ph:408-945-6640 Fax:4 08-94 2 - 1 346 E-Mail [email protected]
XECOM
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.
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