@Override
	public boolean equals(Object obj) {
		if (this == obj)
			return true;
		if (!super.equals(obj))
			return false;
		if (getClass() != obj.getClass())
			return false;
		UsbModemDevice other = (UsbModemDevice) obj;
        if (m_ttyDevs == null) {
            if (other.m_ttyDevs != null)
                return false;
        } else if (!m_ttyDevs.equals(other.m_ttyDevs))
            return false;
		if (m_blockDevs == null) {
			if (other.m_blockDevs != null)
				return false;
		} else if (!m_blockDevs.equals(other.m_blockDevs))
			return false;
		return true;
	}