Library /sys$common/syshlp/tracehlp.hlb ANALYZE, /L3CHANNEL  *Conan The Librarian (sorry for the slow response - running on an old VAX)

    /NOL3CHANNEL
    /L3CHANNEL=(channel-range,...)

    A  list  of  channel  numbers  and  ranges.   Only  trace   records
    containing  a  Packet  Level channel number within a selected range
    will be displayed.  Each channel  range  can  be  either  a  single
    value,  or  a  range  of values, or *.  This is only valid for X.25
    trace  records  that  contain  a   packet   level   field   (X25L2,
    LLC2CHANNEL,  X25L3CHANNEL,  X25L3LINE  and X25GATEWAY).  Note that
    channel numbers  are  displayed  in  HEXADECIMAL  in  the  analyzed
    output.

    /NOL3CHANNEL will select all trace records.

    For example /L3CHANNEL=(0,%x100-*) selects channel  0  and  channel
    numbers greater than or equal to 256 (decimal).