PSTN V.92 Modem Module
56K PSTN Socket Modem (64,5 x 26,5 mm), 3kV isolation, 3.3V power supply based on Conexant Harley 2 module. SIA protocol and Contact ID with speakerphone support for alarm equipment


  • Conexant (Harley 2) based Socket PSTN V.92 Modem 
  • SIA protocol and Contact ID support for alarm equipment
  • Embedded applications:
    Security systems
    Point-of-sale verification systems
    Set top boxes
    Industrial /medical monitoring systems
    Power meters
    Remote monitoring
    E-mail Terminals
    ATM Terminals


  • Housing:
    PSTN Socket Modem : Small Size 64.5 x 26.5 mm
    Reliable SMD based design
  • Power Supply:
    3kV isolation (tested at 3kV dielectric withstandig Voltage)
    Low power consumption
  • Engine:
    Serial modem processor (Conexant) with SmartDAA and Voice codec for Speakerphone Support
    Based on Conexant H2 Harley chip
    Controller-based modem, no external memory required
    NVRAM for adding customized firmware code
    63 embedded and upgradeable country profiles
  • Functionality:
    Full-duplex PCM 8-bit/16-bit voice pass-through mode

    Full duplex Speakerphone with AEC
    DTMF tone detection and generation
    Concurrent DTMF, ring and Caller ID detection
    Hardware and software flow control and speed buffering
    Type I and Type II Caller ID detect
    Type II Caller ID snooping
    Call progress, blacklisting
    Integrated DAA
    Extension pickup detection
    Digital Line protection
    Call Waiting detection
    Line –in-Use detection
  • Communication protocols:
    ITU-T V.92 : Quick Connect, Modem-on-Hold and PCM upstream V.90,V.34,V.32bis, V.32, V.22bis, V.21
    Bell 212A, Bell103
    V.23 Reversing,V.23 half-duplex
    V.29 FastPOS and V22bis fast connect
    V.80 Synchronous Access Mode
    V.17/V.29 Fax Class 1/1.0 and Fax Class 2
    Data compression: V.44,V.42bis, MNP5
    Error Correction: V.42 and MNP 2-4
    V.80 synchronous access mode, synchronous and asynchronous DTE interface
    Telephony/TAM voice modes support (V.253)
  • Alarm Protocols:
    SIA protocol and Contact ID support for alarm equipment
  • Interface & Connectors:
    Serial asynchronous DTE host interface
  • Certification: CE
  • PIN-signals:


Additional Info

Bausch Datacom, a leading designer and manufacturer of dial-up and wireless modems for Commercial and Industrial Systems has developed a complete family of external and embedded modems specifically designed to meet the stringent requirements for the Medical Services, Electricity Metering Industry and Alarm Equipments.
The Bausch SM_H2 Socket Module is a V.92 (56K) PSTN modem based on Conexant Technology. This module is ideal for embedded medical, metering and alarm applications since it offers very low operating power requirements, a small board space, a worldwide compliance and a 3 kV dielectric withstanding voltage. Specifically for alarm applications it supports the SIA alarm protocol and contact ID.
The product can be provisioned for applications ranging from system monitoring and reporting to answering inbound calls with voice responses (for example SIA protocol for alarm equipment with voice listen-in applications –speakerphone functionality-). Industrial temperature ranges (-40° - 80°) are also available on special request.
The modem is available in both Serial TTL format and external modem format with serial RS-232/RS-485 (2 and 4 wire) interface.
The new external modems are available in DIN-RAIL (DinBox PSTN 485 SIA), Desktop (Proxima V.92 SIA) and DIN 43861-2 (InduBox PSTN SIA) format, capable of operating under Windows, Linux or Mac environments. The new Bausch modem family is Safety, Emissions, and Telco compliant to meet most medical, alarm and metering device requirements.
Different versions :
SM_H2 Socket Modem Serial TTL : (64,5 x 26,5 mm)
SM_H2_3V3 V.92 Socket Modem, 3V3, SIA & Contact ID
SM_H2_3V3_V V.92 Socket Modem, 3V3, SIA & Contact ID with Voice listen-in (full duplex speakerphone, simultaneous voice and data)
SM_H2 embedded in DESKTOP RS-232 Serial Modem:
P56SIA Proxima V.92 SIA: Desktop modem, serial RS-232, SIA & Contact ID
SM_H2 embedded in DIN-RAIL RS-232/RS-485 Serial Modem:
DinBoxP485-SIA DinBox PSTN 485 SIA: DIN-rail modem, serial RS-232 and RS-485 (2/4-wire), watchdog, 10-40 Vdc, SIA & Contact ID
SM_H2 embedded in DIN 43861-2 (electricity market)RS-232/RS-485 serial Modem:
IB PSTN SIA InduBox PSTN SIA: modem in sealable DIN 43861-2 housing, serial RS-232 and RS-485 (2-wire), watchdog, 85-265 VAC, SIA & Contact ID

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