XECOM

(1)

XE924M

XE924M

March 2003

XE924M Base Access Point for Multiple Remote Machines

Description

Xecom combines proven embedded modem technology
and a 900 MHz transceiver in the XE924M, Base Access
Point. The Base Access Point is a simple scheme to
connect up to 128 remote systems to a single dial-up
telephone line. Each remote system communicates with
the Base Access Point using Xecom's XE900M Smart
Transceiver. The XE924M eliminates hardware
redundancy, and therefore reduces both the initial
investment and operating costs.

Xecom's Base Access Network significantly reduces
hardware costs in locations with multiple systems. For
example, credit card verification normally requires a
dedicated modem and telephone line for each sales
terminal. Each time a terminal is added another modem
and another telephone line also need to be added. The
Base Access Point connects all of the terminals through
one shared modem and telephone line. The only
hardware requirement is the addition of an XE900M
Smart Transceiver to the terminal equipment.

This scheme eliminates the installation requirements of
a wired network. Whether you add a system equipped
with a Smart Transceiver to the network or build a new
facility, the 900 MHz wireless link eliminates the need to
install cables and configure a server. By virtue of its
commonality with millions of cordless telephones the
XE924M also offers the most cost effective wireless
link available.

The XE924M reduces hardware costs in multiple
system environments. Systems which now require a
dedicated modem and telephone line for each unit
can be connected through the shared modem and
telephone line.

Features

* Small Size: 2.75" by 1.38: by 0.500"

* Provides dial-up network access for up to 128

machines equipped with Xecom's XE900M Smart
Transceiver.

* Count-off feature allows polling of all 128 nodes in

less than 5 seconds

* Telephone Modem Data Transfer at 300, 1200, and

2400 BPS

* Telephone Modem Control and Configuration via

industry standard AT Commands.

* Supports 126 Wireless Carrier Frequency from 902 to

928 MHz

* Wireless Range; maximum 150 Feet indoors

* Wireless Data Rate 9600 BPS, half-duplex

* Integrated communications controller regulates the

wireless communications protocols, error correction
and controls the wireless link to the modem.

* In circuit upgradeable firmware

* User Transferrable FCC Part 68 Registration

* FCC Part 15 Compliance

Preliminary

System A

XE900M

Equipped

XE924M

Base Access

Point

Dial-up

Telephone

Line

System B

XE900M

Equipped

System C

XE900M

Equipped

900MHz Base Access Network

XECOM

(4)

XE924M

XE924M PIN CONFIGURATION

SIGNAL

PINS

DESCRIPTION

RGND

1, 3, 5, 7, 9, 39,

RFGND provides the common reference point for all high frequency

43, 44, 46, 48, 50, 52

signals.

RESERVED

2, 4, 6, 8, 11, 12, 13,

These pins are reserved for future use. No connections should be

18, 40,41, 42, 45, 47,

should be made to these pins.

49, 51

VDD

VDD provides 3 volt power to the communications controller

DGND

DGND provides the ground reference for the modem and
communications controller circuitry in the XE924M.

/RST_VPP

RST_PV provides a hardware reset line for the XE924M's
communications controller.

VCC

VCC provides 3 volt power to the 900 MHz transceiver

2
3
4
5
6
7
8
9

10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26

52
51
50
49
48
47
46
45
44
43
42
41
40
39
38
37
36
35
34
33
32
31
30

28
27

XE924M

RGND

RESERVED

RGND

RESERVED

RGND

RESERVED

RGND

RESERVED

RGND
RGND

RESERVED
RESERVED
RESERVED

VDD

DGND

/RST_VPP

VCC

RESERVED

/DSR

/MDM_DSR

RXD

/MDM_RXD

TXD

/MDM_TXD

/RI

/MDM_RI

RGND
RESERVED
RGND
RESERVED
RGND
RESERVED
RGND
RESERVED
RGND
RGND
RESERVED
RESERVED
RESERVED
RGND
/CTS
/MDM_CTS
/DCD
/MDM_DCD
/DTR
/MDM_DTR
/RTS
/MRTS
Vmd

TIP
RING

XECOM

(5)

XE924M

XE924M PIN CONFIGURATION

SIGNAL

PINS

DESCRIPTION

/DSR

/DSR is the Data Set Ready input to the communications controller. This
pin is normally tied to /MDSR, pin 20

/MDSR

/MDSR supplies the Data Set Ready output from the modem. /MDSR is
an active low output. This pin is normally tied to /DSR, pin 19.

RXD

RXD is the serial data input to the communications controller. This pin is
normally tied to /MRXD, pin 22.

/MRXD

/MRXD is the serial data output from the XE924M's internal modem. A
Mark condition on /MRXD is active low. This pin is normally tied to
RXD, pin 21.

TXD

TXD is the serial data output from the communications controller. It is
normally tied to /MTXD, pin 24

/MTXD

/MTXD is the serial data input to the internal modem. A Mark condition
on /MRXD is active low. TXD is normally tied to /MTXD, pin 23

/RI

/RI provides the Ring Indication input to the communications controller. /
RI is normally tied to Pin 26

/MRI

/MRI supplies the Ring Indication output from the embedded modem in
the XE924M. /MRI is active low. /MRI is normally tied to Pin 26

RING

The Ring and Tip signals provide the connection from the XE924M to
the telephone line. FCC Part 68 Rules require a 1500 volt isolation barrier
between the telephone line and all other circuits. This isolation must be
preserved throughout the system.

UL60950 requires minimum creepage and clearances distances be
maintained between Tip and Ring and all other circuits. Clearance is the
shortest distance between conductive circuits; creepage is the distance
between conductive surfaces along the surface.

TIP

UL60950 requires minimum creepage and clearances distances be
maintained between the Tip and Ring traces and all other circuits.
Clearance is the shortest distance between conductive circuits; creepage
is the distance between conductive surfaces along the surface.

NO PIN

This pin is intentionally removed to improve the isolation from the local
telephone line.

VMD

VMD provides 3.3 Volt power to the integral modem.

Электронный компонент: XE924M