.TH ATMLOOP 8 "April 26, 2000" "Linux" "Maintenance Commands"
.SH NAME
atmloop \- get/set loopback mode of ATM interfaces
.SH SYNOPSIS
.ad l
.B atmloop
.B \-s
.RB [ \-l\ \fIlevel\fP ]
.RB [ \-r\ \fIlevel\fP ]
.RB [ \fIitf\fP ]
.br
.B atmloop
.RB [ \fIitf\fP ]
.br
.B atmloop
.B \-q
.RB [ \fIitf\fP ]
.br
.B atmloop
.B \-V
.ad b
.SH DESCRIPTION
.B atmloop
sets or shows the current loopback settings of an ATM interface, and allows
to query the loopback modes supported by the interface.
.P
Some ATM cards can be configured to echo data back to the driver (local
loopback) or to the network (remote loopback). The echoing may be done at
several different levels:
.IP \fBaal\fP
AAL PDUs
.IP \fBatm\fP
ATM cells
.IP \fBdigital\fP
bits sent to or received from the line interface
.IP \fBanalog\fP
the analog signal
.P
The levels supported by an interface can be queried with the \fB\-q\fP option.
If invoked without options, \fBatmloop\fP displays the current loopback
settings.
.SH OPTIONS
.IP \fB\-s\fP
set loopback mode. Followed by either \fB\-l\fP or \fB\-r\fP, both
options to set local and remote loopback at the same time (if supported by
the driver), or none of them to turn off any loopback.
.IP \fB\-l\ \fIlevel\fP
enable local loopback.
.IP \fB\-r\ \fIlevel\fP
enable remote loopback.
.IP \fB\-q\ \fIlevel\fP
query loopback levels supported by the interface.
.IP \fB\-V\fP
print version number of \fBatmloop\fP on standard output and exit.
.SH AUTHOR
Werner Almesberger, EPFL ICA <Werner.Almesberger@epfl.ch>
.SH "SEE ALSO"
atmdiag(8), sonetdiag(8)
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