DBU rate. The values mean:
dbuRate2400
the DBU interface is operating at 2400bps
dbuRate4800
the DBU interface is operating at 4800bps
dbuRate9600
the DBU interface is operating at 9600bps
dbuRate19200
the DBU interface is operating at 19200bps
dbuRate38400
the DBU interface is operating at 38400bps
dbuRate56000
the DBU interface is operating at 56000bps
dbuRate57600
the DBU interface is operating at 57600bps
dbuRate64000
the DBU interface is operating at 64000bps