problem to graph in MRTG software

[smarifinul]

HI,

At first thank for such helpful script. recently i have graphed Optical power in a MRTG software. but its posible for only one device.
i got OID for a single interface by snmpwalk(1.3.6.1.4.1.2636.3.47.1.1.5.1.2.111.112.116.105.99.115.68.53.51.56).
as per your script 1.3.6.1.4.1.2636.3.47.1.1.5.1.2.111.112.116.105.99.115 is fixed, 68 is for Receive Power dBm. what is for 53.51 ? is this possible to remove? because device to device its vary.