Library /sys$common/syshlp/nclhelp.hlb set, lapb, link, holdback_timer  *Conan The Librarian (sorry for the slow response - running on an old VAX)

    Default: Implementation specific  Value: 0-60000

    Delay, in milliseconds, before an acknowledgment must be sent.
    This characteristic corresponds to the LAPB parameter T2. You can
    modify this characteristic only when the entity is disabled.