zSeries channel and CHPID types

Published 07 November 2002

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Authors: Bill White


This Tip provides zSeries channel type descriptions.


    The following table shows all available channel types for the 9672 G5/G6 and zSeries servers. The value in the CHPID type column is used in the TYPE keyword of the IOCP.

    Channel type
    CHPID type
    Parallel ChannelBLparallel block multiplexer
    BYparallel byte multiplexer
    ESCONCVCconversion channel (ESCON to BL)
    CBYconversion channel (ESCON to BY)
    CNCconnection channel (ESCON Architecture)
    CTCchannel-to-channel (connects to CNC)
    Coupling LinksCFScoupling facility sender
    (2 buffers/connects to CFR)
    CFRcoupling facility receiver (connects to CFS)
    CFPcoupling facility peer
    (7 buffers/connects to CFP)
    CBSintegrated cluster bus coupling facility sender
    (2 buffers/connects to CBR)
    CBRintegrated cluster bus coupling facility receiver (connects to CBS)
    CBPintegrated cluster bus coupling facility peer
    (7 buffers/connects to CBP)
    ICPinternal coupling facility peer
    (7 buffers/connects to another ICP)
    Open System AdapterOSAopen system adapter channel (OSA-2 feature)
    OSDopen system adapter express channel (OSA-Express Queued Direct I/O mode)
    OSEopen system adapter express channel (OSA-Express/non-Queued Direct I/O mode)
    FICONFCfibre connection channel (FICON Architecture)
    FCVconversion channel (FICON-to-ESCON)
    FCPfibre channel protocol (full fabric attachment of Small Computer System Interface devices)
    HiperSocketsIQDinternal queued direct communication channel

    Special Notices

    This material has not been submitted to any formal IBM test and is published AS IS. It has not been the subject of rigorous review. IBM assumes no responsibility for its accuracy or completeness. The use of this information or the implementation of any of these techniques is a client responsibility and depends upon the client's ability to evaluate and integrate them into the client's operational environment.

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