subPortNumber

The subPortNumber is used to identify multiple logical
ports on a physical that require their own interface
number, e.g. DS1s on a DS3 port.
              
Note that multiple protocol layers such as IP over ATM
do not require unique interface numbers and are handled 
by the standard ifStackTable mechanism.
              
Subport 0 is reserved to designate that a physical port
has no subport and hence a single interface number.

MIB

ZHONE-INTERFACE-TRANSLATION-MIB

OID

.1.3.6.1.4.1.5504.3.5.3.1.4

Type

column

Access

readonly

Status

current

Parent

ifIndexToPhysicalEntry