Here are the classes, structs, unions and interfaces with brief descriptions:

_srv_item	The Service Item currently holds only name and priority
commitedTime	A struct to hold the start register and the length register for each ONU in the ONUTable
CopyableQueueCVectors	This class hold pointers to cOutVectors
EPON_LLidCtrlInfo	EPON_LLidCtrlInfo extends cObject and is used for ControlInfo carried in the messages
EPON_mac	EPON_mac class is actually the EtherMAC2 class modified
EPON_OLT_relayDefault	The default relay way
EPON_OLT_vlanBridgeRelay	TODO - Generated class
EPON_ONU_relayDefault	The default relay way
EPON_ONU_vlanBridgeRelay	TODO - Generated class
EtherFrameWithLLID	Class generated from `common/EPON_messages.msg` by opp_msgc
MPCP	Class generated from `common/EPON_messages.msg` by opp_msgc
MPCPGate	Class generated from `common/EPON_messages.msg` by opp_msgc
MPCPRegAck	Class generated from `common/EPON_messages.msg` by opp_msgc
MPCPRegister	Class generated from `common/EPON_messages.msg` by opp_msgc
MPCPRegReq	Class generated from `common/EPON_messages.msg` by opp_msgc
MPCPReport	Class generated from `common/EPON_messages.msg` by opp_msgc
MPCPTools	A class to handle simTime and convert it to nanoseconds clock 32 bit with 16ns granularity
OLT_QPL_RR
OLTMacCtl_NP	OLTMacCtl_NP class controls the below MAC layer transmission times
OLTQPerLLiDBase	OLT_Q_mgmt_PerLLiD creates on queue per MAC-LLID tuple
OLTQPerLLiDBase_P	Polling algorithm base
ONU_QPL_RR
ONUMacCtl_NP	ONUMacCtl class controls the below MAC layer transmission times
ONUMacCtl_P	TODO - Generated class
ONUMacCtlBase
ONUQPerLLiDBase	ONU_Q_mgmt_PerLLiD creates on queue per LLID
ONUTable	A simple class containing a vector of ONUTableEntry objects
ONUTableEntry	This class holds a single ONUTable entry..
PON_Splitter	PON_Splitter is a fairly simple module to forward frames from ONU side to OLT side and the opposite
QueuePerLLid	Allocation per LLID
QueuePerMacLLid	Allocation per MAC-LLID
ServiceConfig	A simple module to configure all the services in a scenario and their parameters
SyncCode	Class generated from `common/EPON_messages.msg` by opp_msgc