A set of capabilities information about ONU.            
| MSB |Byte2|Byte1|               LSB                                       |
|---------------------------------------------------------------------------|
|Rese-|Rese-|Rese-|Rese-|  GIS    |Extended|       |      |Multicast| OMCI  |
|rved |rved |rved |rved |Function |  OMCI  | MGC   | VRG  | Address |Sending|
|(8bi-|(8bi-|(8bi-|(1bi-| Enabling|Enabling| Mode  |      |  Range  | Mode  |
| ts) | ts) | ts) | ts)-|(1bit)   | (1bit) |(2bits)|(1bit)| (1bit)  |(1bit) |
|-----------------------  --------------------------------------------------|
Bits 7 - 31 are reserved for future use.            
Bit 0 represents OMCI sending mode, default value is 0.
If the bit is set to 1, OLT sends OMCI by synchronous mode.             
If the bit is set to 0, OLT sends OMCI by asynchronous mode.  
 
Bit 1 represents default multicast address range mode,
default value is 0.            
If the bit is set to 1, default multicast address range is
all-inclusive mode(224.0.0.0-239.255.255.255).                                   
If the bit is set to 0, default multicast address range is none. 

Bit 2 represents VRG enabling status, default value is 0.        
If the bit is set to 1, VRG function of the ONU is enabled.            
If the bit is set to 0, VRG function of the ONU is disabled.            
This attribute is not used for EPON.

Bit 3 and bit 4 represent MGC configuration mode, default value 
is 0. If both of two bits are set to 0, the MGC configuration mode 
is private. If bit 3 is set to 1 and bit 4 is set to 0, the MGC
configuration mode is ITU-T. If bit 3 is set to 0 and bit 4 is set 
to 1, the MGC configure mode is both.

Bit 5 represents extended OMCI enabling status, default value is 0.
If the bit is set to 1, extended OMCI is enabled.
If the bit is set to 0, extended OMCI is disabled.            
This attribute is not used for EPON.

Bit 6 represents PON GIS function is supported or not, 
default value is 0.
If the bit is set to 1, GIS function is supported.
If the bit is set to 0, GIS function is not supported.