.TH CONC 3 
.SH NAME
conc \- Datakit concentrator
.SH SYNOPSIS
.nf
.B
ctlfd = open("\fIrawdkdev\fP/ctl", ORDWR);
.B
write(ctlfd, "push conc", 9);
.B
write(ctlfd, "config \fIname nc0 nc1\fP...", n);
.fi
.sp
.B bind -a
.BI #K name
.B /dev
.sp
.B
dkctlfd = open("/dev/\fIname\fP/\fIn\fP/ctl", ORDWR);
.SH DESCRIPTION
The concentrator partitions the channel space of a raw Datakit device
(typically
.B #i
or
.BR #h )
into subspaces of size
.IR nc0 ,
.IR nc1 ...
Channel numbers are adjusted on all messages so that each subdevice
sees a channel space starting at zero.
This arrangement must agree with the switch configuration
as provisioned by the local Datakit operating company.
.SH FILES
.B /dev/\fIname\fP/\fIn\fP/data
.br
.B /dev/\fIname\fP/\fIn\fP/ctl
.SH SEE ALSO
.IR datakit (3)