Introduction
The Conexant RH56D-PCI V.90/K56flex™ Host Controlled Modem Device Family supports high speed analog data up to 56 kbps, 14.4 kbps fax, voice/TAM, and speakerphone (optional) operation. The modem operates with PSTN telephone lines in the U.S. and world-wide. The modem is available with or without speakerphone support (see Table 1).
The modem is packaged in a single 144-pin thin quad flat pack (TQFP) that combines PCI Bus Interface (BIF) and Modem Data Pump (MDP) functions. This modem is pin-compatible with the SoftK56-PCI modem, part number R6793 (see SoftK56-PCI data sheet Order No. MD231).

FEATUREs
• Data modem
   − ITU-T V.90, K56flex, V.34 (33.6 kbps), V.32 bis, V.32, V.22 bis, V.22, V.23, and V.21; Bell 212A and 103
   − V.42 LAPM and MNP 2-4 error correction
   − V.42 bis and MNP 5 data compression
   − V.250 (ex V.25 ter) and V.251 (ex V.25 ter Annex A) commands
   − Fax modem send and receive rates up to 14.4 kbps ITU-T V.17, V.29, V.27 ter, and V.21 channel 2
   − EIA/TIA 578 Class 1 and T.31 Class 1.0 commands
• Voice, telephony, TAM
   − V.253 commands
   − 8-bit µ-Law/A-Law coding (G.711)
   − 8-bit/16-bit linear coding
   − 8000/7200 Hz sample rate
   − Music on hold from host or analog hardware input
   − TAM support with concurrent DTMF detect, ring detect and caller ID
• V.80 synchronous access mode supports host-controlled communication protocols
   − H.324 interface support
• V.8/V.8bis and V.251 (ex V.25 ter Annex A) commands
• Full-duplex Speakerphone (FDSP) Mode (SP model)
   − Telephone handset interface
   − External microphone and speaker interface
   − Microphone gain and muting
   − Speaker volume control and muting
   − Adaptive acoustic, line, and handset echo cancellation
   − Loop gain control, transmit and receive path AGC
• Data/Fax/Voice call discrimination
• Multiple country support
   − Call progress, blacklisting
• Single profile stored in host
• Modem and audio paths concurrent across PCI Bus
• System compatibilities
   − Windows 95, Windows 95 OSR2, Windows 98, Windows NT 4.0, Windows NT 5.0 operating systems
   − Microsofts PC 98 Design Initiative compliant
   − Unimodem/V compliant
   − Pentium 133 MHz equivalent or greater
   − 16 Mbyte RAM or more
• 32-bit PCI Local Bus interface
   − Conforms to the PCI Local Bus Specification, Production Version, Revision 2.1
   − PCI Bus Mastering interface to the MDP
   − 33 MHz PCI clock support