                     COURIER HIGH SPEED MODEMS



         APPENDIX H.  TECHNICAL SPECIFICATIONS

      

USROBOTICS HIGH SPEED TECHNOLOGY (HST)

      14.4K bps, synchronous/asynchronous,
      asymmetrical, 14.4K/450 or 14.4K/300 bps
      with automatic handshake adjustment to
      300 bps, Trellis Coded Modulation (TCM),
      Quadrature Amplitude Modulation (QAM)

      12K bps, synchronous/asynchronous,
      asymmetrical, 12K/450 or 12K/300 bps
      with automatic handshake adjustment to
      300 bps, Trellis Coded Modulation (TCM),
      Quadrature Amplitude Modulation (QAM)

      9600 bps, synchronous/asynchronous,
      asymmetrical, 9600/450 or 9600/300 bps
      with automatic handshake adjustment to
      300 bps, Trellis Coded Modulation (TCM),
      Quadrature Amplitude Modulation (QAM)

      7200 bps, synchronous/asynchronous,
      asymmetrical, 7200/450 or 7200/300 bps
      with automatic handshake adjustment to
      300 bps, Trellis Coded Modulation (TCM),
      Quadrature Amplitude Modulation (QAM)

      4800 bps, synchronous/asynchronous,
      asymmetrical, 4800/450 or 4800/300 bps
      with automatic handshake adjustment to
      300 bps, Quadrature Amplitude Modulation
      (QAM)


CCITT V.32 BIS

      14.4K bps, synchronous/asynchronous,
      Trellis Coded Modulation (TCM)



               Technical Specifications    H-1

COURIER HIGH SPEED MODEMS



      12K bps, synchronous/asynchronous,
      Trellis Coded Modulation (TCM)

      9600 bps, synchronous/asynchronous,
      Trellis Coded Modulation (TCM)

      7200 bps, synchronous/asynchronous,
      Trellis Coded Modulation (TCM)

      4800 bps, synchronous/asynchronous,
      Quadrature Amplitude Modulation (QAM)

































H-2    Technical Specifications                                            

                     COURIER HIGH SPEED MODEMS



ADDITIONAL COMPATIBILITY FEATURES

      CCITT V.25 2100 Hz tone

      CCITT V.23, 1200 bps, asymmetrical
      (1200/75 bps), Frequency Shift Keying
      (FSK)

      CCITT V.22 bis, 2400 bps, synchronous/
      asynchronous, Quadrature Amplitude
      Modulation (QAM)

      CCITT V.22, 1200 bps,
      synchronous/asynchronous, Differential
      Phase Shift Keying (DPSK)

      Bell 212A, 1200 bps,
      synchronous/asynchronous, Differential
      Phase Shift Keying (DPSK)

      Bell 103, 300/110 bps, asynchronous,
      Frequency Shift Keying (FSK)

      CCITT V.21, 300 bps, asynchronous,
      Frequency Shift Keying (FSK)

      300/110 bps, asynchronous, variable
      Frequency Shift Keying (FSK)

      USRobotics HST error control protocol,
      asymmetrical mode, at
      14.4K/12K/9600/7200/4800 bps, 450/300
      bps back channel

      CCITT V.42 error control protocol at
      14.4K/12K/9600/7200/4800 bps (V.32 bis
      mode) and at 2400/1200 bps

      CCITT V.42 bis data compression

      Microcom Networking Protocol (MNP) error
      control protocol, Levels 2-4 at


               Technical Specifications    H-3

COURIER HIGH SPEED MODEMS



      14.4K/12K/9600/7200/4800 bps (V.32 bis
      mode) and at 2400/1200 bps

      Microcom Networking Protocol (MNP) Level
      5 data compression at
      14.4K/12K/9600/7200/4800/2400/1200 bps

      DB-25 RS-232 terminal/modem interface

      Superset of industry standard AT command
      set, S-registers, DIP switches

      Optional MI/MIC closure

      Optional pulsed DSR





























H-4    Technical Specifications                                            

                     COURIER HIGH SPEED MODEMS



DTE RATES

      38.4K, 19.2K, 9600, 4800, 2400, 1200,
      300, 110 bps


LINK RATES

      14.4K, 12K, 9600, 7200, 4800, 2400,
      1200, 300, 110 bps


ONLINE FALLBACK/FALL FORWARD

      14.4K, 12K, 9600, 7200, 4800 bps


PHONE LINE INTERFACE

      RJ11, RJ45S phone jacks


COMMUNICATIONS CHANNEL

      Full/half duplex on 2-wire dial-up,
      dedicated, or leased phone lines;
      demand-driven high speed channel
      turnaround in HST mode; symmetrical
      speeds in V.32 bis mode


OPERATIONAL MODES

      Synchronous/Asynchronous, Auto
      Dial/Answer, Manual Originate/Answer,
      Smart/Dumb mode


DIALING

      Rotary (pulse 0-9), Touch-Tone (DTMF 0-
      9, #, *), a-z when in Quote (") Mode


               Technical Specifications    H-5

COURIER HIGH SPEED MODEMS




DATA FORMAT

      Binary, serial; defaults to 7-bit word
      length, even parity

     Start Data             Stop
      Bits Bits   Parity    Bits
      
       1    7   Even, Odd    1
               Mark, Space
       1    7None, Even, Odd,2
               Mark, Space    
       1    8      None     1, 2






























H-6    Technical Specifications                                            

                     COURIER HIGH SPEED MODEMS



FRONT PANEL STATUS LIGHTS

       HS  High Speed (above 2400 bps)
       AA  Auto Answer/Answer
       CD  Carrier Detect
       OH  Off Hook
       RD  Received Data
       SD  Send Data
       TR  Terminal Ready (DTR)
       MR  Modem Ready/Test Mode
       RS  Request to Send
       CS  Clear to Send
       SYN Synchronous Mode
       ARQ Error control connection
           established
         

FLOW CONTROL BUFFERS

      Transmit Buffer

          Error control:  3.25k bytes

          Non-Error control:  1.5k bytes, 128-
      byte option

      Receive Buffer:  2K bytes


COMMAND BUFFER

      40 characters, exclusive of AT prefix,
      Carriage Return and spaces


TEST OPTIONS

      Analog loopback with test pattern
      Remote digital loopback
      Digital loopback
      Test pattern
      Dial test


               Technical Specifications    H-7

COURIER HIGH SPEED MODEMS



CALL PROGRESS CODES

      NO DIAL TONE
      BUSY
      NO ANSWER
      RINGING
      VOICE


FAILED CALL TIMEOUT

      60-sec. default, programmable 2-255 sec.


ANSWER TONE TIMEOUT

      60 sec.


ANSWER TONE DETECTOR

      2200-2300 Hz


LOSS OF CARRIER (DISCONNECT TIMER)

      0.7-sec. default, programmable 0.2-25.5
      sec.


EQUALIZATION

      Adaptive


TRANSMITTER CARRIER FREQUENCIES

      USR-HST, 450 bps back channel
   Originate Mode:375 Hz
      Answer Mode:1800 Hz

      USR-HST, 300 bps back channel
   Originate Mode:350 Hz

H-8    Technical Specifications                                            

                     COURIER HIGH SPEED MODEMS



      Answer Mode:1800 Hz

      V.32 bis
   Originate Mode:1800 Hz
      Answer Mode:1800 Hz







































               Technical Specifications    H-9

COURIER HIGH SPEED MODEMS



      V.23
      Originate Mode:   
             Mark:390 Hz
            Space:450 Hz
      Answer Mode:
             Mark:1300 Hz
            Space:2100 Hz
                  
      V.22 bis, V.22, Bell 212A
      Originate Mode:1200 Hz
      Answer Mode:2400 Hz
      
      Bell 103
      Originate Mode:   
             Mark:1270 Hz
            Space:1070 Hz
      Answer Mode:
             Mark:2225 Hz
            Space:2025 Hz
      
      V.21
      Originate Mode:
             Mark:980 Hz
            Space:1180 Hz
       Answer Mode:     
             Mark:1650 Hz
            Space:1850 Hz


RECEIVER CARRIER FREQUENCIES

      USR-HST, 450 bps back channel
   Originate Mode:1800 Hz
      Answer Mode:375 Hz

      USR-HST, 300 bps back channel
   Originate Mode:1800 Hz
      Answer Mode:350 Hz

      V.32 bis
   Originate Mode:1800 Hz
      Answer Mode:1800 Hz


H-10    Technical Specifications                                           

                     COURIER HIGH SPEED MODEMS



      V.23
      Originate Mode:   
             Mark:1300 Hz
            Space:2100 Hz
      Answer Mode:
             Mark:390 Hz
            Space:450 Hz
      
      V.22 bis, V.22, Bell 212A
   Originate Mode:2400 Hz
      Answer Mode:1200 Hz

      Bell 103
   Originate Mode:      
             Mark:2225 Hz
            Space:2025 Hz
      Answer Mode:
             Mark:1270 Hz
            Space:1070 Hz

      V.21
   Originate Mode:
             Mark:1650 Hz
            Space:1850 Hz
      Answer Mode:
             Mark:980 Hz
            Space:1180 Hz


RECEIVE SENSITIVITY

      - 44 dBm + 2 dBm


TRANSMIT LEVEL

      - 9 dBm maximum


TRANSMITTER FREQUENCY TOLERANCE

      .01%


              Technical Specifications    H-11

COURIER HIGH SPEED MODEMS



CERTIFICATION

      FCC Part 68 and Part 15, Class B
      Domestic; DOC (Canada), UL listed


POWER CONSUMPTION

      5 watts


SIZE

      8.30 x 12.65 x 1.57 inches






























H-12    Technical Specifications                                           
