ATM_PHY_SIG_UNKNOWN
signal = ATM_PHY_SIG_UNKNOWN;
atm_dev_signal_change(atm_dev, ATM_PHY_SIG_UNKNOWN);
atm_dev_signal_change(atm_dev, ATM_PHY_SIG_UNKNOWN);
atm_dev_signal_change(atm_dev, ATM_PHY_SIG_UNKNOWN);
atm_dev->signal = ATM_PHY_SIG_UNKNOWN;
dev->signal = ATM_PHY_SIG_UNKNOWN;