XECOM XE0055T2, XE0055T1, XE0055S2, XE0055S1 Datasheet

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

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"

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)