Library /sys$common/syshlp/ncphelp.hlb SET, CIRCUIT, BABBLE TIMER milliseconds  *Conan The Librarian (sorry for the slow response - running on an old VAX)

 Applies to DDCMP CONTROL circuits.  It represents the number of
 milliseconds that a selected tributary or remote half-duplex
 station is allowed to transmit.  Milliseconds must be a decimal
 integer in the range 1 to 65535.  The  default is 6000 (6
 seconds).