ASCII string containing encoded summary of slot front
panel status.  The encoding uses keywords and associated
allowed values.

Keyword:value pairs delimited by the pipe '|' symbol, and
within a pair, a keyword should be separated from its
associated value by a colon ':' character.

Agent should provide the following info if available.  If
unknown or inapplicable, it should be omitted.

Description      Keyword  Allowed Values
---------------------------------------------------------
Slot/SNMP Type   slid     [use nbsCmmcSlotType]
LED              ledx     [use nbsCmmcLedColor]
PortLink         plnkx    [use nbsCmmcPortLinked]
PortOperational  popx     [use nbsCmmcPortOperational]
PortSelectLink   pselx    actv|stdby
PortConnector    pconx    [use nbsCmmcPortConnector]

An example string could be:
   |slid:436|led1:2|plnk1:2|pop2:2|psel2:actv|pcon4:15|

If this object is not supported, this string should be
empty.