ATM modPHY Cards
          Customer Installable Media Interface Modules

    The ATM modPHY cards allow the exchange of data between
    different ATM systems using particular Physical Layer (PHY)
    types.  ATM modPHY cards provide the media-specific portion
    of an ATM interface to support ATM connectivity across
    multiple platforms for different media types at speeds up to
    155.52 Mb/s. 

    The host system provides the power, initialization, and
    control for the modPHY card.  The modPHY card is used with an
    ATM segmentation and reassembly (SAR) or cell-switching line
    card.

    ATM modPHY cards are optional single-port daughter cards that:

    . Provide a customer-installable, field-replaceable module
    . Provide front insertion, hotswapping capabilities, and FLOWmaster 
      flow control if supported by the host system
    . Support cabling and connectors for:
      - STS-3c (155 Mb/s) multimode fiber (MMF), DAGGM-AA
      - STS-3c (155 Mb/s) single-mode fiber (SMF), DAGGS-AA
      - STS-3c (155 Mb/s) unshielded twisted-pair (UTP) or
        STS-3c (155 Mb/s) screened twisted-pair (ScTP), DAGGU-AA
      - T3 (44 Mb/s) coaxial, DAGGT-AA
      - E3 (34 Mb/s) coaxial, DAGGE-AA
      - E1 (2 Mbps) short reach UTP, DAGE1-AA 
      - T1 (1.54 Mbps), DAGT1-AA

    Hosts which use modPHY cards include:

      VNswitch 900
      ATMswitch 900
      GIGAswitch/ATM
      GIGAswitch/FDDI
      DECNIS 600 Router

    Reference the host's firmware release notes to ascertain
    which media options are currently supported by a host system.