237     _PACK_STR = '!B'  variable in ChassisID
238     _PACK_SIZE = struct.calcsize(_PACK_STR)
256                 self._PACK_STR, self.tlv_info[:self._PACK_SIZE])
281     _PACK_STR = '!B'  variable in PortID
282     _PACK_SIZE = struct.calcsize(_PACK_STR)
301                 self._PACK_STR, self.tlv_info[:self._PACK_SIZE])
325     _PACK_STR = '!H'  variable in TTL
326     _PACK_SIZE = struct.calcsize(_PACK_STR)
334                 self._PACK_STR, self.tlv_info[:self._PACK_SIZE])
463     _PACK_STR = '!HH'  variable in SystemCapabilities
464     _PACK_SIZE = struct.calcsize(_PACK_STR)
484                 self._PACK_STR, self.tlv_info[:self._PACK_SIZE])
589     _PACK_STR = '!3sB'  variable in OrganizationallySpecific
590     _PACK_SIZE = struct.calcsize(_PACK_STR)
598                 self._PACK_STR, self.tlv_info[:self._PACK_SIZE])