|| $self->ut_foreign_key('modelnum', 'cable_model', 'modelnum')
|| $self->ut_alpha('serialnum')
|| $self->ut_mac_addr('mac_addr')
|| $self->ut_foreign_key('modelnum', 'cable_model', 'modelnum')
|| $self->ut_alpha('serialnum')
|| $self->ut_mac_addr('mac_addr')