background image

NAL Research Corporation (TN2009-25-V1.0) 

level (i.e. low) for at least 270 ms and released, the A3LA-XM will alternate from its current on/off state. The 

current drawn on the external load used to pull the A3LA-XM to GND is no more than 0.5mA. The signal on 
pin 1 is considered GND when it is at 0.5V or less. 

 

Cables used to supply power to the A3LA-XM should be kept as short as possible to prevent significant 

voltage drop, which can cause the A3LA-XM to malfunction during a data call, a voice call, an SMS session or 
an SBD session. Power reset by the A3LA-XM during a call is an indicative of the DC power source unable to 
sustain voltage above 4.0VDC at peak current demand. 

3.5 Audio Interface 
 

The  A3LA-XM  supports  both  digital  and  analog  audio  I/O.  The  digital  audio  is  in  PCM  format.  In  such 

format, digital audio cannot travel far (less than one foot); this is why the analog is chosen for the A3LA-XM 
audio  handset.  The analog audio  input  is  a  single-ended,  unbalanced  input  with  a minimum  impedance  of 
10k   to  ground.  The  A3LA-XM  accepts  a  maximum  input  level  of  2.0V  peak-to-peak  without  signal 

distortion.  The  analog  audio  output  is  also  a  single-ended,  unbalanced  output  capable  of  driving  an 
impedance of 600  or more to ground. The A3LA-XM delivers undistorted audio up to 2.0V peak-to-peak at 

this port. 

 

The combined analog I/O audio interface (pins 5 and 15) and the DPL UART I/O interface (pins 18 and 

20) enable an analog audio handset to be connected to the A3LA-XM. The signal level for the DPL I/O can be 
RS232 or logic level. The level can be selected using a switch that is accessible when the SIM cover plate is 
removed.  With  the  DPL  audio  handset  model  DPLS0401-X  and  DB25  data  kit  model  HRC-24-8X/XU,  the 

A3LA-XM  can  be  used  both  as  data  modem  and  a  satellite  phone  (see  Figure  4).  This  setup  can  be  an 
extremely useful developmental tool since the modem status can be seen on the handset LCD similar to a 
9555 Iridium phone. 

 

 

 

 

 

 

 

 

 
 

3.6 Digital Peripheral Link (DPL) 
 

The DPL interface is composed of two ports—a full duplex asynchronous serial link for control messages 

and  a  PCM  digital  audio  link  for  audio  traffic.  The  protocol  used  on  these  ports  is  made  available  to 

application developers only on a case-by-case basis and after appropriate Non-disclosure Agreements and/or 
License Agreements are executed. 

Figure 4. 

A3LA-XM connected to a DPL handset, AC adapter and data Kit. 

DPL Handset 

Model DPLS0401-X 

AC Adapter  

Model LA-3098 

DB25 Data Kit 

Model HRC-24-8X 

Summary of Contents for A3LA-XM

Page 1: ...document or from the use of the A3LA XM based on this document including but not limited to claims or damages based on infringement of patents copyrights or other intellectual property rights NAL Res...

Page 2: ...Data Interface 3 Wire Configuration 7 3 3 USB Data Interface 7 3 4 DC Power Interface 8 3 5 Audio Interface 9 3 6 Digital Peripheral Link DPL 9 4 0 IRIDIUM ANTENNA CONNECTOR 10 5 0 GPS FEED THROUGH OP...

Page 3: ...ones Trackers LBT L Band Transceiver LED Light Emitting Diode LNA Low Noise Amplifier NIPRNET Non Secure Internet Protocol Router Network NOC Network Operation Center OFAC Office of Foreign Asset Cont...

Page 4: ...3LA XM has been certified to MIL STD 810F standards for temperature humidity altitude rain shock sand dust and salt fog Services supported include 1 Dial Up Data 2 Direct Internet Connection or NIPRNE...

Page 5: ...n the field of view between the modem antenna and the Iridium satellite 2 4 Environmental Specifications Operating Temperature Range 30o C to 70o C 22o F to 158o F Operating Humidity Range 75 RH Stora...

Page 6: ...ntrol input DC Power 2 12VDC Output Voltage to Power the DPL Handset DC Power 3 EXT_GND External GND input DC Power 4 EXT_B External 4 0VDC 32 0VDC input DC Power 5 SPKR_AUD Speaker audio output Analo...

Page 7: ...he DTR input from the DTE 4 AT Kn must be set to AT K0 for no flow control or AT K4 for XON XOFF software flow control 5 The setting can be stored on the modem permanently until another setting overwr...

Page 8: ...voided if the A3LA XM is disassembled for any reason other than to set these switches IMPORTANT The A3LA XM USB port does not work reliably under Windows Vista 64 3 4 DC Power Interface The DC power...

Page 9: ...is also a single ended unbalanced output capable of driving an impedance of 600 or more to ground The A3LA XM delivers undistorted audio up to 2 0V peak to peak at this port The combined analog I O au...

Page 10: ...e specifications in the following table It should be noted that the A3LA XM power transmission profiles may vary for a number of reasons Users are reminded to optimize their setup to attain the lowest...

Page 11: ...GPS pass through connector must be terminated with a 50 load when not in use A suitable load is the Huber Suhner 65_SMA 50 0 1 111_NE Either a passive or an active GPS receiver can be connected to th...

Page 12: ...her encrypted or unencrypted data in all modes dial up direct Internet RUDICS SBD and SMS The A3LA XM does not support encrypted voice calls All voice calls are made in the clear unless an external en...

Page 13: ...uring data calls A3LA MPT versions earlier than 1 1 0 had the timer set to every 2 minutes When the timer expires the micro controller will check to make sure the 9522B is still responding by sending...

Page 14: ...e a true drop in replacement for the A3LA D Figure 4 of 4 in Appendix E shows the dimension of the optional plate 11 0 TECHNICAL SUPPORT FOR TECHNICAL SUPPORT PLEASE CONTACT US AT Phone 703 392 1136 F...

Page 15: ...e projects 48 beams on the surface of earth which may be viewed as providing coverage cells on the ground similar to terrestrial systems Each beam is approximately 600 km in diameter The 66 satellite...

Page 16: ...nd operates an Iridium gateway located in Hawaii United States Each gateway generates and controls all user information pertaining to its registered users such as user identity geo location and billin...

Page 17: ...e LAN or an Internet service provider as shown in Figure A2 The handshaking and protocols are established between the modems independent of the landline The Iridium dial up data service functions in m...

Page 18: ...ure B3 illustrates how Iridium Internet NIPRNet call is routed Direct Internet service can be enhanced using Windows based emulated point to point protocol PPP called the Apollo Emulator With the use...

Page 19: ...140 octet byte maximum message size SMS service is a store and forward method of transmitting messages to and from an Iridium modem The short message from the modem is stored in a central Short Messag...

Page 20: ...y The Iridium network can locate an ISU to within 10 km only about 78 of the time The so called error ellipse can have a large eccentricity with the major axis oriented in the azimuth dimension and th...

Page 21: ...use of a non standard antenna not expressly approved by the party responsible for compliance could void the user s authority to operate the equipment CE Compliance The 9522B when marked with the CE sy...

Page 22: ...laws and regulations Failure to comply can result in the imposition of fines and penalties the loss of export privileges and termination of your contractual agreements with NAL Research The export an...

Page 23: ...NAL Research Corporation TN2009 25 V1 0 23 APPENDIX D MIL STD 810F CERTIFICATE OF COMPLIANCE...

Page 24: ...NAL Research Corporation TN2009 25 V1 0 24 IRIDIUM NAL Research Corporation Model A3LA XM POWER SERIAL DPL SIM APPENDIX E MECHANICAL DRAWINGS...

Page 25: ...NAL Research Corporation TN2009 25 V1 0 25 NAL Research Corporation Model A3LA XM POWER SERIAL DPL SIM IRIDIUM...

Page 26: ...NAL Research Corporation TN2009 25 V1 0 26...

Page 27: ...NAL Research Corporation TN2009 25 V1 0 27...

Reviews: