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V.91 Modem Software

V-91 Modem SoftwareV.91 modem software is fully compliant with the ITU V.91 Recommendation and optimized for most architectures. ITU-T V.91 specifies the operation of a duplex digital modem for use on a 4-wire circuit switched connection and on leased point-to-point 4-wire digital circuits at data signalling rates of up to 64 kbit/s. Contact us to discuss your V.91 modem application requirements.

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VOCAL’s V.91 modem software is optimized for performance on leading DSP architectures and processors from TI, Intel, ADI, AMD and other vendors. Our modem software may be licensed standalone, as a library or complete design. Custom designs are also available to meet specific modem application requirements.

Virtual Modem over IP

VOCAL’s SIP Software modem (MoIP or V.MoIP) solution provides developers a range of solutions to connect legacy dial up modems to modem infrastructure. Unlike other virtual modem designs, the SIP software modem can communicate with a physical modem at the far end using a VoIP service over an IP network.

V.91 Software Features

  • Duplex mode of operation on a 4-wire digital connection;
  • Channel separation by 4-wire connection;
  • PCM modulation at a rate of 8 ksymbols per second;
  • Synchronous channel data signalling rates from 28 kbit/s to 64 kbit/s in increments of 8/6 kbit/s;
  • An optional control channel that uses 125 bit/s of the primary channel data signalling rate and allows for a 67.5 bit/s secondary channel data signalling rate;
  • Adaptive techniques to achieve close to the maximum data signalling rate that the channel can support on each connection;
  • Support of transparent mode on unrestricted 64 kbit/s channels;
  • Exchange of rate sequences during start-up to establish the data signalling rate;
  • Automoding to devices supporting V.8, and optionally V.8 bis, procedures.

V.91 Modem

The V.91 digital modem is specified in terms of coding, start-up sequences, operating procedures and DTE-DCE interface functionalities.  ITU V.91 includes an optional control channel and support for transparent mode on unrestricted 64 kbit/s channels. The network interface and the signalling rate that is used to connect the V.91 modem locally to a 4-wire connection are considered to be country specific matters and are hence not specified.

Platforms

supported-platforms

VOCAL’s optimized software is available for the following platforms. Please contact us for specific V.91 supported platforms.

Processors Operating Systems
  • Texas Instruments – C6000 (TMS320C62x, TMS320C64x, TMS320C645x, TMS320C66x, TMS320C67x), DaVinci, OMAP, C5000 (TMS320C54x, TMS320C55x)
  • Analog Devices – Blackfin, ADSP-21xx, TigerSHARC, SHARC
  • PowerPC
  • MIPS – MIPS32, MIPS64, MIPS4Kc
  • ARM – ARM7, ARM9, ARM9E, ARM10E, ARM11, StrongARM, ARM Cortex-A8, Cortex-M1
  • Intel / AMD – x86, x64 (both 32 and 64 bit modes)
  • Google Android
  • Apple iOS / iPhone / iPad & MacOS
  • Unix,  Linux, μClinux, BSD
  • Microsoft Windows ACM / RTC / CE / Mobile
  • Symbian
  • eCOS / eCOSPro
  • Wind River VxWorks
  • Green Hills Integrity
  • VOCAL LANsEND
  • Micrium μCOS

Links

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VOCAL Technologies, Ltd.
520 Lee Entrance, Suite 202
Amherst New York 14228
Phone: +1-716-688-4675
Fax: +1-716-639-0713
Email: sales@vocal.com