This object indicates the type of an optical interface, when
the type is not specified in the ifType object in the IF-MIB,
i.e., when the ifType object is set to 'other'.
The value 'opticalTransponder' represents an optoelectronic
interface that relays signals of various physical layer
protocols. The interface may be capable of pulse shaping and
retiming. The interface may be capable of monitoring various
physical layer protocols. The interface may emit signals
that are colored (e.g. one channel in a DWDM system) or
uncolored (i.e., for single channel interfaces).
The value 'wdmTransport' indicates an optical interface that
carries multiple wavelengths.
The value 'wdmChannel' indicates an interface sub-layer above
'wdmTransport' representing a single wavelength.
The value 'wdmChannelGroup' indicates an interface sub-layer
above 'wdmTransport' representing a wavelength division
multiplexed group of wavelengths.
The value 'wavelengthTransport' indicates an optical interface
that carries a single wavelength.
The value 'ethernetPhy' indicates an interface that implements
the physical layer of the Ethernet protocol.
The value 'esconPhy' indicates an interface that implements the
physical layer of ESCON.
The value 'gigabitPhy' indicates an interface that supports the
physical layers of both Gigabit Ethernet and Fibre Channel.
The value 'twoGigabitPhy' indicates an interface that supports
the physical layer of 1x and 2x Fibre Channel.
The value 'sonetPhy' indicates an interface that carries the
trunk side traffic of eight port multirate muxponder
The value 'multiRate' indicates an interface that supports
client protocols of eight port multirate muxponder .