rman to another server

hi all
i have two linux redhat5.4 servers
  - the rman server where the rman database resides
  - the target server where the explo(sid)  database resides 

i want to make an rman backup from explo but i wan to store the backups files in the rman database disk.i register the database
and

i use

connect target;
run {
  allocate channel D1 type disk
  ;
  backup
    full
    filesperset 10
    format '/BACKUPS/$SID/brman_%d_db_%s'
    (database)
    ;
}
 ilaunched from the rman nachine , /BACKUPS is on the rman machine, but rman tries to write in the target database disk

is there a way to make a backup with rman storing the backup in the rman disks ????