/sys$common/syshlp/NCLHELP.HLB  —  set  lapb  link  retry_maximum
    Default: Supplied by profile         Value: 1-255

    Maximum number of times that a frame will be retransmitted
    before assuming a fatal error, at which point more drastic
    error recovery action will be attempted. This characteristic
    corresponds to the LAPB parameter N2.
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