XECOM XE3301I, XE3301G, XE3301F, XE3301B, XE3301 Datasheet

XECOM (1) XE3301

Multi-National 33,600 BPS Modem Module

XE3301

11-05-96

xecom

Description

Xecom's XE3301 is a complete 33,600 bps modem
in a single component. It is available for use in
many countries throughout the world. Xecom
offers versions for North America and Japan,
Germany, France, the United Kingdom and other
countries of the European Community.

The XE3301 is a complete modem including the
DAA. XE3301 users do not need to add RAM,
ROM, Crystals, transformers, or switches to
complete the modem design. The user only needs
to provide the TTL level, serial interface and the
telephone jack.

The XE3301 is a full-featured modem. Besides the
high-speed, XE3301 bps data transfer, the XE3301
supports data compression, error correction and
fax transfer. The XE3301 also inlcudes NVRAM
for permanent storage of the modem configuration.

The XE3301 is pin compatible with Xecom's
XE2401, XE9601 and XE1401 modems. This
family of modems permits a simple upgrade path
from 2400 bps to 33,600 bps.

Features

*

Models for North America, Japan, and Europe

Country Model
Canada XE3301
Japan XE3301
France XE3301F
Germany XE3301G
Italy XE3301I
UK XE3301B
USA

1

XE3301

1

(user transferable FCC Registration)

*

Small Size: 2.75 inches by 1.38" by 0.42"

*

Modem Protocols: V.34bis (33,600 bps), V.34,
V.32bis, V.32, V.22bis, V.22, V.21, Bell 212A
and 103

*

Fax Protocols: V.17 (14,400 bps), V.29, V.27ter,
and V.21 channel 2

*

Error Correction; V.42, MNP2-4 and MNP10

*

Data Compression; V.42bis and MNP5 provides
a maximum effective data rate of 133,400 bps.

*

Pin compatible upgrade for Xecom's XE2401,
XE9601, and XE1401 modems

Block Diagram

Modem

Controller

ROM

NVRAM

Analog

Front

End

DAA

/DTR
/RTS
/CTS
/DSR

TXD

RXD

/DCD

/RI

Serial I/O

RESET

AR

/LCS

OH

AMP

Tip

Ring

Auxiliary I/O

XECOM (2) XE3301

XE3301 Mechanical Specifications

A 2.74 2.760 69.60 70.10
B 1.370 1.390 34.80 35.31
C 0.400 0.420 10.16 10.67
D 0.890 0.910 22.61 23.11
E 1.890 1.910 48.01 48.51
F 0.125 0.200 3.18 5.08
G 0.080 0.100 2.03 2.54
H 0.415 0.435 10.54 11.05
J 0.090 0.110 2.29 2.79
K 0.020 0.025 0.51 0.64
L 0.380 0.400 9.65 10.16
M 0.090 0.110 2.29 2.79

Pins = 0.025 inch square pin
All pins tin-plated

INCHES METRIC(MM)

PIN MIN MAX MIN MAX

XE3301 PIN CONFIGURATION

RESET

N/C

RXD

/DTR
/LCS
/CTS

OH

TXD

/RTS

NC

/RI

TIP

RING

VCC
/DSR
/DCD

AMP
GND

1
2
3

9
10
11
12
13
14
15
16

18

20

40
39
38

22
21

XECOM (3) XE3301

1 RESET Hardware reset pin, Input, active High, TTL. A high on Pin 1 initiates a hardware

reset. An external reset is not required or recommended. The Reset pulse must be

a minimum of 100 milliseconds long.
2 N/C
3 RXD Received Data, Output, TTL. Serial data output to the host. A logic "High" on RXD

represents a "mark" and a logic "Low" represents a "space".
9 \DTR Data Terminal Ready, Input, active Low, TTL. The "AT&D" command sets the

function of DTR. The default, AT&D2, requires the host to assert DTR to permit a

modem link. The modem drops the call in progress if DTR is revoked and will not

connect until DTR is re-asserted.

10 \LCS Loop Current Sense, active Low Input, TTL. A low on \LCS tells the modem that

loop current is flowing through Tip and Ring. This feature is used only in the

XE3301B version.

11 \CTS Clear to Send, Output, active Low, TTL/CMOS. CTS is used as a Flow Control

output from the modem. The modem revokes CTS with hardware flow control active

to signal the host that the modem's input buffer is full. The modem reasserts CTS

when the buffer can accept more data without a buffer overflow.

12 OH Off-Hook, Output, active High. OH indicates the modem's hookswitch relay is

closed. Hookswitch closure connects the modem to the telephone line.

13 TXD Transmit Data, Input, TTL. Serial data input from the host. A logic "High" represents

a "mark" and a Low represents a"space", TTL.

14 \RTS Request to Send, input, active LOW, TTL. The XE3301 uses RTS for hardware flow

control. When RTS is revoked and hardware flow control is enabled, the modem will

not place data RXD.

15 NC No Internal Connection
16 \RI Ring Indicator, Output, active Low, TTL. When low indicates the modem is receiving

a ring signal.

18 TIP Tip connection to the phone line(RJ11 pin3) from the internal DAA. The XE3301 is

not sensitive to the battery voltage polarity across Tip and Ring.

20 RING Ring connection to the phone line(RJ11 pin4) from the internal DAA.
21 GND Ground (0 volts)

PIN NAME DESCRIPTION

XE3301 Pin Descriptions

XECOM (4) XE3301

PIN NAME DESCRIPTION

XE3301 Pin Descriptions

22 AMP Audio Output function is set by L & M commands and the value in register S22. This

output can drive a minimum load of 300 ohms.

38 \DCD Data Carrier Detect, Output, active Low, TTL/CMOS. &C sets the DCD function. In

the default condition, AT&C1, DCD indicates the presence of a carrier signal on the

telephone line.

39 \DSR Data Set Ready, Output, active Low, TTL/CMOS. &S sets the DSR function. In the

default condition, AT&S0, DSR is forced true.

40 Vcc +5 Volts

ABSOLUTE MAXIMUM RATINGS*

SUPPLY VOLTAGE - Vcc +6.5 Volts

DC INPUT VOLTAGE -0.6 Volts to +6.5 Volts

STORAGE TEMPERATURE RANGE -25° C TO +85° C

LEAD TEMPERATURE (Soldering, 2 sec per wave) 260° C

OPERATING TEMPERATURE RANGE 0 TO 70° C

*Exceeding these values may result in permanent damage to the device.

XE3301 ELECTRICAL SPECIFICATIONS

VCC 4.75 5.25 Volts
ICC 170 200 220 mamps On Line

50 mamps Idle

Ring Voltage Detected 38 150 RMS XE3301

10 RMS XE3301B, XE3301I

20 RMS XE3301G
Ring Frequency Detected 15.3 68 Hz
Telephone Loop Current 10 100 mamps XE3301

10 120 mamps XE3301B, XE3301I

10 60 mamps XE3301G

10 45 mamps XE3301F
Data Transmit level -12 -10.5 -9.0 dBm
DTMF Transmit Level -2.5 0 dBm Avg over 3 second interval
Billing tone Filter 16 KHz XE3301G Only

Parameter Min Typ Max Units Comments

XECOM (5) XE3301

XE3301 Typical Applications Schematic

Note: RJ11 Pin assignments reflect a 6-pin connector. Tip and Ring are always the center pins of the

RJ11 jack.

Recommended Parts

Reference Designation Description Recommended Part Number

L1, L2 Ferrite Beads TDK CB30-1812

C1, C2 Capacitors Sprague 30GAT47, 470 pfd, 3000 Volts

J1 RJ11 Jack Stewart SS6446NF

XECOM (6) XE3301

XE3301 AT Commands

Modes of Operation

The XE3301 uses "AT" commands for control and

configuration. The XE3301 operates in three
modes; Command Mode, Fax Mode and Data
Mode. Extensions to the AT command set support

fax operation.

Data Mode: The modem enters data mode after it
establishes a link and issues a "CONNECT" result
code. In Data Mode the modem modulates all
signals on Transmit Data, Pin 13, and sends them
to the remote modem. The modem demodulates
the signal from the remote modem and places it
onto Received Data, Pin 3, for the host equipment.
When the modem exits data mode, it issues a "NO
CARRIER" result code.

Command Mode: The XE3301 enters command
mode on application of power, reset, loss of the
connection, or receipt of the escape sequence. In
command mode the modem accepts commands
from the host on Transmit Data. Appropriate
result codes are returned on Received Data at the
same speed and parity as the commands.

Fax Mode: The modem enters fax mode on
receipt of the AT+FCLASS=1 command. Fax
commands and responses are issued at 19,200
bits per second; the character format is 8 bits no
parity. The modem accepts Class 1 Fax
commands only in fax mode. The A/, ATO, AT&T
and escape commands are not valid in fax mode.

Commands

The modem is configured and controlled with AT
commands. AT commands follow a strict format.
The command line is stored in the command
buffer and executed upon receipt of a carriage
return. Until executed, the command line can be
edited with the backspace key.

Command Format - Each command, except A/,
begins with the AT prefix. The "A" and "T" may be
both upper case or both lower case but cannot be
of different cases. The modem uses the prefix to
identify the host's speed and parity. The modem
determines speed by measuring the width of the
incoming bits and parity by comparing the parity
bits of the "A" and "T." The modem then returns
result codes at the host's speed and parity.

Command Line - A command line may include
multiple commands. The modem executes the
commands in the sequence they appear in the
command line. Spaces, inserted to improve
legibility, do not fill space in the command buffer.
A carriage return terminates the command line and
causes the commands to be executed. Register
S3 allows the user to select a character other than
a carriage return to terminate the command line.

Command Buffer - The command buffer holds 40
characters, including the AT prefix. If it overflows,
the modem issues an "ERROR" result code and
commands are not executed.

Command Line Editing - A backspace can be
used to edit the command any time before it is
executed. The backspace character, Control and
H simultaneously on some systems, erases the
previous character in the command line. Any
character except for the "A" and "T" can be erased.
Register S5 allows the user to select a character
other than a backspace to edit the command line.

Re-Execute Last Command - The A/ command
causes the modem to re-execute the command
line stored in the command buffer. This is the only
command which does not require the "AT" prefix.

Omitted Parameters - Most commands include a
parameter which determines the command
function. When the parameter is omitted from the
command string, it is assumed to be a 0.