INTRODUCTION
The ADSP-21mod870-110 is a complete single chip. All datapump and controller functions are implemented on a single 0.4 square-inch chip. This modem package allows the highest modem port density, while achieving the lowest power consumption in a software upgradable platform.

FEATURES
   ISDN B-Channel HDLC
   DATA Modulations
      CCITT V.90 (30k–56k)
      K56Flex™ (30k–56k)
      ITU-T V.34: 33600 Bits/s–2400 Bits/s
      CCITT V.32bis: 14400 Bits/s–7200 Bits/s
      CCITT V.32: 9600 Bits/s, 4800 Bits/s
      CCITT V.23
      CCITT V.22/V.22bis: 2400, 1200, 600 Bits/s
      CCITT V.21: 300 Bits/s
      Bell 212A: 1200 Bits/s
      Bell 103: 300 Bits/s
   Start-Up Procedures:
      ITU-T V.8
   Error Correction and Data Compression:
      CCITT V.42 Error Correction (LAPM and MNP2-4)
      CCITT V.42bis Data and MNP Class 5 Compression
   FAX Modem
      V.17/V.29/V.27ter/V.21 Channel 2
      T.30 Protocol
   V.120
   V.110
   PPP Asynchronous Framing Support (RFC 1662)
   Low Power
      80 mW Typical Active
      Low Power and Sleep Modes
   High Density
      100-Lead LQFP Package
      On-Chip DS0/DS1 Interface
      Full Function DMA Port
      No External Memory Required
      0.4 Square Inch per Complete Modem Port
   3.3 V Supply
   Fully Upgradable RAM-Based Architecture
   Fast Download
      Full Image in 5 ms
   High Speed 16-Bit Port Link Bus Provides Simple
      Interface Between Host and Modem Pool