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XEISDNU Page 1 of 10
XEISDNU
Single Module ISDN Terminal Adapter
With Integrated NT1 Interface
Description
The XEISDNU integrated ISDN Terminal
Adapter is a unique component level solution for
high speed, stand-alone and embedded equipment applications needing access to ISDN service. The module can directly connect to a host
computer through its on-board EIA-232E interface
and link to the ISDN subscriber line U interface
with its integrated NT1.
The device is designed for the ISDN Basic
Rate Interface (BRI) which consists of two bearer
(B) channels for data or voice and one delta (D)
channel for signaling. The module provides two
64k bps channels between the host computer and
the ISDN service. One is available as a data
channel and the other can be made available for
analog phone/fax/modem calls with the addition
of the XEISDNP Analog Telephone (POTS)
Equipment Interface. Together these provide the
user with a complete ISDN terminal adapter
function in two compact modules.
Built-in ISDN control firmware supports all the
functions necessary for setup and configuration of
the terminal adapter and the ISDN line. Configuration can be accomplished via an extended AT
command set, a menu-driven setup utility, or
factory default/user stored configuration profiles.
The built-in ISDN Monitor firmware has fifteen
commands supporting customer program
development and download. The 256K x 16
Flash Memory is designed to support custom
control program downloading. By changing a
configuration pin, the XEISDNU can boot-up from
the ISDN Monitor or a user developed program
as well as the built-in ISDN control program.
Features
• Small size: 2.75" x 1.38" x 0.42"
• On-board Motorola MC68302 Integrated Multiprotocol Processor with RISC controller for
high speed operations; also included on-board:
128K x 16 SRAM, 256K x 16 Flash Memory
and 8K x 8 EEPROM
• ISDN line U interface (integrated NT1) with
2B1Q encoding (ANSI T1.601) for North
American usage. V.120 data rate adaptation
protocol and point to point protocol (PPP)
• ISDN control program allows connection with
AT&T 5ESS, Northern Telecom DMS 100 and
National ISDN-1 central office switches
• Standard EIA-232E, ITU V.24 serial interface,
300 to 115,200 bps asynchronous and 1200 to
64,000 bps synchronous data rate
• Menu-driven and stored configurations
• Control signal outputs to interface with
XEISDNP Analog Telephone (POTS) Equipment Interface module
• On-board ISDN Monitor supports user
program downloading and system debugging
• Jumper configurable memory addressing
allows change from Development mode (using
ISDN Monitor) to Application mode (using
either a built-in ISDN control program or a user
developed program)
• ISP (In System Programmable) Flash Memory
capability for future function up-grading
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XEISDNU Block Diagram
Mechanical Specifications
INCHES METRIC (MM)
MIN MAX MIN MAX
A
2.740 2.760 69.60 70.10
B
1.370 1.390 34.80 35.31
C
0.420 0.430 10.67 10.92
D
1.190 1.210 30.23 30.73
E
2.290 2.310 58.17 58.67
F
0.125 0.200 3.18 5.08
G
0.080 0.100 2.03 2.54
H
0.215 0.235 5.46 5.97
J
0.090 0.110 2.29 2.79
K
0.020 0.025 0.51 0.64
(Total pin count is 24 per side view.)
U
Interface
ISDN
Local
Loop
68000
Core
DMA
(1)
Timers
(3)
512KB
Flash
Memory
256KB
SRAM
RISC
Controller
DMA
(6)
1152 Byte
Dual Port
RAM
8KB
EEPROM
SMCs (2)
and
SCP
SCCs
(3)
RS-232C
Drivers
I/O Ports
POTS Data RS-232 POTS Control
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Pin Configuration
Pin Descriptions
Pin Name Pin # Direction Description
TIN1 1 ISDN U transformer Primary side (see schematic)
TIN2 2 ISDN U transformer primary side (see schematic)
No Pin 3 N/A No pin
TOUT1 4 ISDN U transformer secondary side (see schematic)
TOUT2 5 ISDN U transformer secondary side (see schematic)
Reserved 6 N/A No user connection allowed
Reserved 7 N/A No user connection allowed
Reserved 8 N/A No user connection allowed
GND 9 Ground Power & signal ground
TIN1
TIN2
TOUT1
TOUT2
Reserved
Reserved
Reserved
GND
CFG/SDO
TD
RD
RTS
CTS
DSR
CD
TCLK
RCLK
DTR
RI
MCLK
RST BT
-12V
GND
+5V
DCL
D OUT
DIN
FSX
Reserved
Reserved
Reserved
Reserved
FSR
isp EN
SCLK
OH/MODE
DTMF_RDY/SDI
RING EN
DC EN
PWR CTRL
RT CTRL
PDI
D4
D5
D6
D7
+12V
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
48
47
46
45
44
43
42
41
40
39
38
37
36
35
34
33
32
31
30
29
28
27
26
25
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Pin Descriptions continued
CFG/SDO 10 Input/Output Configuration setup. See Modes of Operation. When reprogramming
the In-System Programmable (ISP) CPLD, this pin is used for the
cascade connections and should not be pulled low or high.
TD 11 Input RS-232C, Transmitted Data
RD 12 Output RS-232C, Received Data
RTS 13 Input RS-232C, Request to Send
CTS 14 Output RS-232C, Clear to Send
DSR 15 Output RS-232C, Data Communications Equipment (DCE) Ready
CD 16 Output RS-232C, Received Line Signal Detect
TCLK 17 Output RS-232C, Transmit Clock
RCLK 18 Output RS-232C, Receive Clock
DTR 19 Input RS-232C, Data Terminal Ready
RI 20 Output RS-232C, Ring Indicator
MCLK 21 Input RS-232C, Master Clock, Transmitter Signal Timing (DTE Source)
RST_BT 22 Input Optional on-board processor Reset button
-12V 23 Power -12 Volt power supply
GND 24 Ground Power & signal ground
+12V 25 Power +12 Volt power supply
D7 26 Input Data bus line 7 for CODEC Data
D6 27 Input Data bus line 6 for CODEC Data
D5 28 Input Data bus line 5 for CODEC Data
D4 29 Input Data bus line 4 for CODEC Data
PDI 30 Output CODEC Power Down Control
RT_CTRL 31 Output CODEC Voice Signal Route Control
PWR_CTRL 32 Output POTS Phone Set Power Control
DC_EN 33 Output Enable DC Source for RING generation
RING_EN 34 Output RING Signal Enable for POTS module
DTMF_RDY/SDI 35 Input DTMF Signal Ready from POTS module. When used with the In
System Programmable CPLD, It becomes the SDI
OH/MODE 36 Input Off Hook Signal from POTS module. When used with In System
Programmable CPLD it becomes the Mode Control
SCLK 37 Input SCLK for In System Programmable CPLD
ISP_EN 38 Input In System Programmable CPLD Enable Signal
FSR 39 Output CODEC Frame Sync. Receive
Reserved 40 N/A No user connection allowed
Reserved 41 N/A No user connection allowed
Reserved 42 N/A No user connection allowed
Reserved 43 N/A No user connection allowed
FSX 44 Frame Synchronization
DIN 45 Input Data In
DOUT 46 Output Data Out
DCL 47 Data Clock
+5V 48 Power +5 Volt power supply
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XEISDNU Page 5 of 10
Electrical Specifications
ABSOLUTE MAXIMUM RATINGS
Parameter Maximum Value*
Supply Voltage VCC (+5V) +6.5 Volts
Supply Voltage VDD (+12V) +15 Volts
Supply Voltage VEE (-12V) -15 Volts
DC input voltage (TTL inputs) -0.6 Volts to +6.5 Volts
Storage Temperature Range -25C to +85C
Lead Temperature (soldering, 2 sec/wave) +260C
Operating Temperature Range 0 to 70C
*Exceeding these values may result in permanent damage to the device
POWER SUPPLY CHARACTERISTICS (Ta = +70C)
Symbol Parameter Min Typ Max Unit Notes
VCC Supply Voltage 4.75 5.0 5.25 Volts
ICC VCC Supply Current 200 mA
VEE Supply Voltage +9 +12 +15 Volts
IDD VDD Supply Current 35 mA
VEE Supply Voltage -9 -12 -15 Volts
IEE VEE Supply Current 50 mA
I/O Characteristics
ISDN U - INTERFACE
Parameter Specification
Line interface (with recommended components) ANSI T1.601, 2B1Q encoding, U reference point
Rate adaptation V.120 or Clear Channel
Protocol PPP (Point to Point Protocol)
RS-232E INTERFACE*
Parameter Symbol Min Typ Max Unit Notes
Input Current
Low State
IIL 1.0 1.6 mA VIL = 0
Input Current
High State
IIH 10 mA VIH = 5.0V
Output Voltage
High State
VOH +9.0 +10.5 Volts VCC = +13.2 Volts
VEE = -13.2 Volts
Output Voltage
Low State
VOL -9.0 -10.5 Volts VCC = +13.2 Volts
VEE = -13.2 Volts
VEE Supply Voltage -9 -12 -15 Volts
IEE VEE Supply
Current
50 mA
*For additional information see Motorola MC1488 Quad Line Driver data sheet
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Recommended Components List
Component Quantity Value Supplier Part Number Phone Number
Transformer 1 Midcom 671-7308 (605) 886-4385
Transformer 1 Midcom 671-7834 (605) 886-4385
Schott 671 46720 (615) 889-8800
Pulse Engineering PE 68628 (619) 674-8100
Resistor 2 6 Ohm, _ W
Capacitor 1 3300 pF
Connector 1 8 pin (pins 4, 5 active) RJ45
Design Considerations
ISDN Capability
Integrated Services Digital Network (ISDN) is a powerful, flexible, high-speed service now available from
most local phone service providers in North America, Asia, and Europe. It provides two 64k bps digital
bearer channels (B channels) and one 16k bps signaling channel (D channel) over a single pair of copper
wires. Typically the installed base of subscriber loop wiring is adequate for this service, making ISDN the
most cost effective means of delivering high speed digital dial-up service to homes and businesses.
Because ISDN is a digital service, connection of computer equipment does not require a modem like a
conventional analog line. However a terminal adapter is required to translate the physical signal levels and
the protocols of the Data Terminal Equipment into those of the ISDN lines and switches. External ISDN
Terminal Adapters have been available for some time. The XEISDNU provides a simple means for
designers to implement an internal TA function without dedicating an entire board and a significant firmware
investment to this purpose.
Terminal Adapter Function
The XEISDNU integrated ISDN Terminal Adapter Module is designed to provide a compact, simple
design solution for adding ISDN service access to industrial, medical, computer, business, and consumer
products which need to communicate with remote computers or networks at high data rates. Only four
passive components must be added to implement the hardware interface, signaling and protocols for the
North American ISDN standard interface to the local telephone company.
When used alone the XEISDNU module presents a high speed digital data channel to the local host
equipment through a standard RS-232E serial interface. This channel can be configured by the designer or
user for up to 64k bps synchronous transmission or up to 115,200 asynchronous operation (limited by the
speed of the host serial interface).
When combined with the XEISDNP Analog Telephone Equipment Interface, the XEISDNU can provide
either B channel ( on the same physical ISDN line) for simultaneous use by an independent analog phone,
fax, or modem designed for “Plain Old Telephone Service” (POTS). Thus the user can place voice calls
over the same ISDN line as data calls, and his investment in existing analog phone equipment is
preserved.
Modes of Operation
Application Mode
The normal mode of operation of the XEISDNU is Application Mode. This would typically be the only
mode visible to the equipment end user. When the CFG/SDO (pin 10) is pulled high, the XEISDNU module
is in the Application mode. The ISDN configuration and control program supplied by XECOM or the equipment designer’s specially developed control program will boot-up upon power-on. In this mode the control
program can occupy up to 240K x 16 of the 256K x 16 Flash memory.
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XEISDNU Page 7 of 10
Typical Application Circuit
See page 9 of this datasheet for a full-page schematic
Development Mode (ISDN Monitor)
XEISDNU also provides a development tool for designers who wish to write their own firmware control
code. When the CFG/SDO (pin 10) is pulled low, the module will boot-up from the on board ISDN Monitor
program. The XECOM ISDN Monitor has fifteen debugging commands including program downloading,
memory contents display and Flash memory operation. The complete command set is listed in the
Configuration Guide.
After the designer program has been developed and tested using the ISDN Monitor utility it can be
downloaded into non-volatile Flash memory. The module is then reconfigured to the Application Mode, and
the program is ready to run.
Configuration and Setup
An ISDN telephone line presents a significantly more powerful and complex interface to the user than a
standard analog (POTS) line. Unlike an analog line, the digital ISDN line requires special setup, demultiplexing, and signal processing to separate its two 64k bps data channels (B channels) and its 16k bps
signaling channel (D channel) at the user interface. In order to establish a connection to an ISDN line,
certain parameters must be exchanged between the telephone company switch and the local data
communication equipment to initialize the call. It is assumed here that the user has access to an already
installed ISDN line and the configuration parameters (Dial Numbers, Service Profile Identifiers, Switch
Type, Switch Version, Long Distance Carrier) provided by the phone company for that line. Further
information on these parameters is contained in the Configuration Guide.
In addition to the remote switch configuration, the local terminal adapter (TA), like an analog modem,
must be set up properly to operate. There are several parameters which must be set compatibly at the TA
and the switch to specify the exact services to be provided over the line. These parameters will vary with
the application. The XEISDNU implements these functions based on setup information provided by the
user. There are three methods for configuration of the link.
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AT Command Configuration
The most basic configuration technique is through AT commands. The user interface is similar to that of
an analog modem with an extended command set. The user communicates this information to the module
through the RS-232E serial port. A PC running standard VT100 compatible serial communications software
is typically used for this purpose. The AT command set of the XEISDNU is designed to enable configuration
and testing for both the remote switch and the terminal adapter.
Like an analog modem, the XEISDNU operates in two modes: data mode and command mode. In data
mode the device sends all data received at its data ports down the ISDN link. In command mode the TA
interprets these inputs as configuration and setup commands and processes them locally. Commands are
communicated to the TA via its RS232 serial interface from the local host processor. The TA enters
command mode upon power-on, any time the Escape command “+++” is received, or when a call is
terminated.
The commands for TA configuration are modeled on the standard set used for analog modems with
extensions for the new ISDN functions. Commands for remote switch configuration and the unique ISDN
functions required of the terminal adapter have been added. The XEISDNU firmware contains an AT Command Help listing which can be displayed by typing “AT&H” while in command mode. The module will
respond with a listing of AT commands with brief definitions of each. The complete command set listing
appears in the Configuration Guide along with examples of configuration profiles for typical applications.
Menu Configuration
The second configuration method uses a group of Setup Menus built into the XEISDNU firmware. These
menus are accessed by entering the command “@SETUP” while the module is in Command Mode. Keyboard commands from a PC in VT100 terminal emulation mode allow the user to move through the
complete set of configuration choices, enter variable data, and store the results. Operation of the Setup
Menus are explained in the Configuration Guide.
Stored Configurations
A complete set of configuration parameters must be in place each time the XEISDNU places a call.
However the current parameters are held in volatile memory and are lost when the host equipment power
is interrupted. Also, once a working configuration has been established for a particular ISDN line, terminal
equipment set, and service type there is no need to change it for each call. To speed up and/or automate
the call setup process stored configurations are provided in the XEISDNU.
Two types of stored configurations are provided: factory defaults and user defined configurations.
Factory defaults are stored in Flash memory while user defined sets are stored in EEPROM. The factory
default configuration sets provided represent setups for common applications. Descriptions of these are
contained in the Configuration Guide. There are provisions for two user defined configuration sets. In
addition the settings associated with switch parameters are stored and accessed separately to help prevent
accidental changes. Extended AT commands are provided to store and load these configuration sets upon
power up or separately. These commands are detailed in the Configuration Guide.
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XEISDNU Page 9 of 10
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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 lifesustaining equipment, are specifically not recommended without additional processing and authorization
by XECOM for such application.
Life Support Policy
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. 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.
Copyright, XECOM © 1997
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. Products mentioned herein are used for
identification purposes only and may be trademarks and/or registered trademarks of their respective
companies.
Xecom, Inc.
374 Turquoise Street
Milpitas, CA 95035 USA
Tel: 408 • 945 • 6640
Fax: 408 • 942 • 1346
www.xecom.com
#9712-XEISDNU
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