[j-nsp] Tracking Juniper Pluggable Optics

[Clinton Work]

JunOS doesn't provide part numbers (show chassis hardware models) for
pluggable optics.  I'm wondering how people track the part #s for
pluggable optics for sparing & inventory purposes?  You can use the
Juniper manufacturing # (ex 740-031981), but this could change over time
due to later revisions.   Maybe using the pluggable optic description
(SFP+-10G-LR) is the best option?   

show chassis hardware
Item             Version  Part number  Serial number     Description
  PIC 2                   BUILTIN      BUILTIN           4x 10GE(LAN)
  SFP+
    Xcvr 0       REV 01   740-031981   2ZT817101261      SFP+-10G-LR
    Xcvr 1       REV 01   740-031981   2ZT817102631      SFP+-10G-LR


Take, the SFP+-10G-SR optic as another example.  When 740-021308 is
installed in a MX960 then it has Juniper part # SFPP-10GE-SR according
to the following datasheets, but when installed in a EX8216 switch, the
optic part # changes to EX-SFP-10GE-SR.  

M/MX/T Optic Modules:
https://www.juniper.net/us/en/local/pdf/datasheets/1000329-en.pdf
EX8200 Ethernet Linecards:
https://www.juniper.net/us/en/local/pdf/datasheets/1000262-en.pdf

-- 
Clinton Work