XECOM XE0020C, XE0020 Datasheet

Description

The XE0020 and XE0020C are complete compact
telephone interface modules. As with all Xecom
DAAs the XE0020 and XE0020C include Ring
Detection, Switch-Hook, and Loop Current
Holding Circuits. In addition both the XE0020 and
XE0020C include two line monitors to insure
unobtrusive customer premises operation. The
XE0020C also passes the Caller ID signal through
to the system host.

Xecom designed the XE0020 and XE0020C for
unobtrusive operation in residential applications.
Two integral line monitors prevent interference
with the residents calls.

Connect Detect verifies line availability before the
equipment seizes the line. This will prevent the
equipment from interrupting a residents call.

Handset Interrupt signals the system host to
drop the call in progress when the resident picks­up an extension phone. This feature permits the
resident to interrupt the call in case of emergency.

Caller ID permits the host to
identify incoming calls and
answer only those from
designated call centers.

Together these features give
residents priority use of the
telephone line without shutting
out the equipment.

XECOM XE0020

Telephone Line Interface with Active Line Monitoring

XE0020 and XE0020C

8/97

Features

* Small Size: 2.0" by 0.5" by 0.4" thick;
* Supports data transfer at 33,600 bps;
* FCC Part 68 Compliant;
* Ring Detection;
* Continuous Connect Detect Monitor;
* Handset Interrupt Monitor
* Single +5 Volt Power Supply;
* Hookswitch Control
* Caller ID Signal Path (XE0020C)

Models

XE0020: includes ring detect , hookswitch,

Handset Interrupt, Connect Detect, telephone
line transformer, loop current holding circuit;

XE0020C: XE0020 features plus Caller ID signal

pass through;

Block Diagram

OH

RI

RING

TIP

T1

T2

Line

Transformer

Hook-

Switch

Ring

Detect

CD

Line
Voltage
Monitor

Loop
Current
Holding

Circuit

HInt

Caller ID

(optional)

1 Ring Ring is one of two signals which form the telephone network connection (RJ11 Pin 4). The

XE0020 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 which 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 an active high input. 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 XE0020's internal telephone line

transformer.

5 GND This signal is used as common reference for all of the control signals in the XE0020. Signals

on T1 and T2 are not referenced to ground.

XECOM (2) XE0020

Mechanical Specifications

A

B

C

D

E

F

G

H

I

J

D

E

E

A - 0.400 - 10.16
B - 0.520 - 13.21
C - 2.020 - 51.05
D 0.040 0.060 1.02 1.52
E 0.090 0.110 2.29 2.79
F 0.790 0.810 20.07 20.57
G 0.490 0.510 12.45 12.95
H 0.390 0.410 9.91 10.41

I 0.040 0.060 1.02 1.52

J 0.125 0.200 3.18 5.08

Inches Millimeters

Dim Min Max Min Max

Pin Size: 0.025" by 0.025"
Recommended hole size: 0.056"
All pins tin-plated.

12 345678 910

oo oooooo oo

Ring Tip OH T1 Gnd Vcc T2 /RI HInt /CD

XE0020/XE0020C Pin Configuration & Descriptions

bottom view

Pin Name Description