Host Signal Processing Modem (HSP ModemTM) Chip

388 ASICThe PCT388 is a high speed HSP Modem chip  implementing ITU-T V.34 33.6Kbps protocols and Rockwell's K56Flex technology. Several patents are pending on the PC-TEL HSP Modem software and hardware architecture. The PCT388 supports baseline data/fax/voice communication features without  the expensive DSP data pump, controller , UART and memory components found in conventional DSP modems.  Luxury features such as simultaneous voice and data (DSVD) and HSP Speakerphone can be supported through a full duplex audio chip. In the absence of a full-duplex audio chip, the external low-cost PC-TEL ASIC/Voice CODEC is needed for DSVD/HSP Speakerphone.

The HSP Speakerphone feature allows speakerphone support with any  full-duplex audio CODEC. HSP Speakerphone is just a software upgrade.

The PCT388 has been designed to operate in a Windows environment ensuring product compatibility over the life of the product.  The PCT family of products are software upgradable for speed, features, and enhancements, thus eliminating the need to ever have to "swap out" product.

The HSP Modem reference design, evaluation units, users manual, schematics and Gerber files will be provided on request to qualified customers.
Features:
  • 56K TIA/ITU standards upgradable data/14.4K Fax/ADPCM Voice/V.80
  • Optional DSVD/HSP Speakerphone as a software upgrade using full-duplex audio chip (or with low cost PC-TEL ASIC/Voice Codec
  • Supports Win 3.11, Win 95, OS/2 and NT 4.0 operating systems
  • Received Win 95 logo
  • On-Chip PnP logic. Supports 16 bit PnP address. Needs 256 bytes external serial EEPROM (XX93C56)
  • Pin-compatible with the PCT288I in non-PnP mode
  • PCT388P comes in 100-pin PQFP package.
  • PCT388T comes in 100-pin TQFP package.
  • Auto selection of COM ports/ IRQs
  • Supports Ties AT command set
  • High throughput virtual (software) UART  allows DTE rate over 115,200 bps
  • Low power consumption (150mW operating  @ 5V) and auto power management
  • Excellent choice for low power applications

System Requirements:

  • Pentium class CPU (100 MHz)/ 8MB RAM/256K L2 cache with ISA bus expansion slot
  • Windows 3. 11, Win 95, OS/2, NT 4.0 and relevant applications
  • Communications software package
  Technical Specifications

Data Modulation Standards

  • A 56K bps TIA/ITU standards software upgradable technology
  • ITU-T V.34: 33,600, 31,200, 28,800, 26,400, 24,000, 21,600, 19,200, 16,800, 14,400, 12,000, 9,600, 7,200, 4,800, 2,400bps
  • ITU-T V.32bis: 14,400, 12,000, 9,600, 7,200,bps(TCM), 4,800bps(DPSK)
  • ITU-T V.32: 9,600 bps (TCM/QAM), 4,800 bps (DPSK)
  • ITU-T V.22bis: 2,400 bps (QAM)
  • ITU-T V.22: 1,200 bps (DSPK)
  • ITU-T V.21: 300 bps (FSK)
  • ITU-T V.23: 1,200/75 bps (FSK)
  • Bell 212A: 1200 bps (DSPK)
  • Bell 103: 300 bps (FSK)

Data Compression

  • ITU-T V.42bis
  • MNP Class 5

Error Correction

  • ITU-T V.42 LAPM
  • MNP 2-4

Fax Modulation or Protocol Standards

  • ITU-T V. 17: 14,000, 12,000, 9,600, 7,200 bps (TCM)
  • ITU-T V.29: 9,600 bps (QAM), 7,200 bps (QAM)
  • ITU-T V.27ter: 4,800 bps(DSPK), 2,400 bps (DSPK)
  • ITU-T V.21 Channel 2: 300 bps (FSK)
  • Group 3
  • EIA Class I

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