The MDMQ9604 HF Modem

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The MDM-Q9604HF Modem

• Rod Blocksome
• Feb. 3, 2005

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Topics

• Modem Overview
• Diversity Performance
• Voice over IP (VoIP)
• Serial Control over IP (SCoIP)

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MDM-Q9604 ModemOverview
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Rockwell Collins MDM-Q9604 HF Modem
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Q9604 Features

• JITC certification for MS-188-110B, App. C F
• DERA (QuinetiQ) certified for S-4539, Annex B
• Wide Selection of Standard Proprietary
  Waveforms
• Data Transmission Rates up to 64 kbps using 4ISB
  HF or 76.8 kbps using 25 kHz V/UHF Channel
• Compatible with MS-188-141B ALE Radios
• Diversity Operation

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Q9604 Features cont.

• VoIP Mode
• SCoIP Mode
• Three Modem Control Methods
• Local front panel or embedded GUI
• Serial control through COM ports
• Ethernet through sockets
• Software upgradeable from Ethernet port
• LINUX operating system
• Comprehensive BIT

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Waveform Summary
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Waveform Summary cont.
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Specification Summary

• Data Interfaces
• RS-232/422/423 sync/async
• MS-188-114 sync/async
• Functional digital data Ethernet
• Remote Control
• RS-232/422/423/485
• Ethernet
• Embedded Control
• Front Panel
• Linux X-Windows GUI
• Single Ethernet Connection for data control
  (separate sockets)

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Specification Summary cont.

• Receive Transmit Audio 600-ohm balanced
  Adjustable Tx levels
• Radio Keyline dry contact, open collector,
  6-volt with each audio channel
• Prime Power 85 265 Vac, 47 440 Hz
• Size 1.75 x 19 x 16 inches
• Weight 8.6 lbs

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Diversity Performance
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Types of Diversity

• Frequency Diversity
• Transmit same information on more than one
  Frequency or Channel
• Polarization Diversity
• Receive same channel on two separate antennas
  one vertical other horizontal
• Not applicable for LOS and surface wave
  propagation
• Space Diversity
• Receive diversity with antennas separated
  spatially

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Types of Diversity cont.

• Time Diversity
• Transmit time delayed data on separate channel
• Transmit Diversity
• Same data on multiple channels
• Diversity provides link improvements provided the
  diversity channels have uncorrelated
  noise/fading/interference characteristics

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Receive Diversity Performance

• Q9604 has 4 audio channels to provide
• Up to four channel diversity for single channel
  waveforms
• Dual Channel diversity with MS-188-110B App. F
  waveform
• Diversity performance evaluated using baseband
  channel simulators

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Tx Audio
Rx Audio
MDM-3001
MDM-3001
Q9604 Modem
Q9604 Modem
MDM-3001
MDM-3001
Channel Simulators
Tx Data
Data Analyzer
Rx Data
Fireberd 6000A
Test Set-up Block Diagram
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CCIR Channel Definitions
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Diversity (2 Channels)

• CCIR Poor
• 5 to 7 dB improvement for 4.8 to 9.6 kbps
• CCIR Moderate
• 7 to 8 dB improvement for 4.8 to 9.6 kbps
• CCIR Good
• 8 to 10 dB improvement for 4.8 to 9.6 kbps

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Diversity (4 Channels)

• CCIR Poor
• 10 to 12 dB improvement for 9.6 kbps
• At 15 dB SNR, BER lt 10-3 for 9.6 kbps
• CCIR Moderate
• 15 to 17 dB improvement for 9.6 kbps
• CCIR Good
• 14 to 15 dB improvement for 9.6 kbps

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Diversity MS-188-110B App. F

• CCIR Poor
• 6 to 9 dB improvement for 9.6 to 19.2 kbps
• CCIR Moderate
• 5 to 9 dB improvement for 9.6 to 19.2 kbps
• CCIR Good
• 7 to 10 dB improvement for 9.6 to 19.2 kbps
• Channel diversity should allow 19.2 kbps with 20
  dB SNR HF link

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Voice over IPandSerial Control over IP
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Why VoIP and SCoIP?

• Reduction in operating costs for remote
  controlled HF Ground Stations
• Currently multiple phone line channels used
  between operators and radio sites
• Replace with WAN/LAN running IP data
• VoIP for analog audio e.g. voice traffic
• SCoIP for equipment control/monitoring e.g.
  radios, modems, antenna switching/rotation, etc.

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Control Site
Receiver Site (10 Receivers)
Rx Audio (10)
Tx Audio (10)
Control (2)
Tx Audio (10)
Control (1)

• Typical Split-Site HF Station
• 30 Phone line channels for audio
• 3 Phone line channels for control

Transmitter Site (10 Transmitters)
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Control Site
Receiver Site (10 Receivers)
VoIP SCoIP
LAN/WAN
Transmitter Site (10 Transmitters)

• Typical Split-Site HF Station
• All Audio on VoIP
• All Control via SCoIP

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Q9604 VoIP Function

• Allows voice to use an IP Network as the
  transport channel between a radio operator and a
  remote radio while maintaining the ability of the
  modem to function as a modem
• Provides ability to control the PTT or keyline
  of the remote radio
• Q9604 provides keyline input for PTT devices, and
  supports VOX thresholds as a keying mechanism
• Based upon standard protocols for compatibility
  with COTS VoIP clients minor VoIP COTS client
  modifications likely needed to support HF or VHUF
  radio systems
• Two CODECS 32 kbps ADPCM and 32 kbps µLaw
• Q9604 VoIP mode features several configurable
  parameters for adapting to congested IP networks
• Supports split-site ALE systems

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Q9604 SCoIP (Serial Control over IP)

• Enables control of remote serial devices over IP
  links
• The controllers serial cable is connected to the
  base station Q9604s AUX port
• The Q9604 SCoIP menu acquires the IP address of
  the remote Q9604 modem a common port number is
  then configured on both the base and remote Q9604
  modems, serving as the control socket
• The remote station Q9604 modem interfaces with
  the serially controlled device, via the modems
  COM port
• Q9604 SCoIP function is independent of the modem
  function. Waveform data and control packet
  messages are exchanged through a single common IP
  link, to the modems data and control sockets

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IP Voice and Serial Control DataRTP Stream
Interconnect

• Single Radio remotely operated/managed by a
  single workstation
• Transceiver supports 2 ISB Channels (Audio)
• Operator console consists of an audio interface
  panel and a pc/laptop
• Control Software only needs to provide serial
  control of transceiver

Control PC
Audio Console
Push To Talk
RS-232 Control Data
TX/RX Audio 2 Channels
MDM-Q9604
MDM-Q9604

• 4 RTP Streams
• Audio Channel 1
• Audio Channel 2
• Push-to-Talk (Radio key line)
• Possibly combined with Audio channel 1
• RS-232 Serial Control Data

TX/RX Audio 2 Channels
RS-232 Control Data
Push To Talk
Transceiver
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IP Voice and Serial Control DataRTP Stream
Interconnect9604 in Split-Site mode
Control PC
Audio Console

• Split Site Configuration remotely
  operated/managed by a single workstation
• Transmitter and Receiver each support 2 ISB
  Channels (Audio)
• Operator console consists of an audio interface
  panel and a pc/laptop
• Control Software could be any application capable
  of split site serial control
• Operator workstation MDM-Q9604 splits audio,
  transmit audio goes to transmit site, receive
  audio goes to receive site
• RS-232 control and push-to-talk is also passed
  to both transmit site and receive site
  simultaneously

Push To Talk
RS-232 Control Data
TX/RX Audio 2 Channels
MDM-Q9604
MDM-Q9604
MDM-Q9604
RX Audio 2 Channels
RS-232 Control Data
Mute
Push To Talk
TX Audio 2 Channels
Receiver
RS-232 Control Data
Transmitter
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Transmitter Site
Receiver Site
Receiver Site
Control Site A
Transmitter Site
Transmitter Site
LAN/WAN
Receiver Site
Receiver Site
Transmitter Site
Expansion to Multi-User/Control Multi-Station
Control Site C
Control Site B
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The End