Hello FTLE 20 : My MSL -100 Switch was running version 7 (and has been for years), but in the past 4 years, I was experiencing a LOT of P-Side Link failures due to a "Bad Frame Pule" error (per the ENET/LOGUTIL messages (example from my printout on my terminal):
FTRCAKUACG0 ENET311 JUL29 21:37:02 9900 FAIL ENET PSide Link Test
Plane: 1 Shelf: 00 Slot: 25 Link: 03 Test Type: Fiber Test
PM: DTC 1 , Port: 1, Capability: Fiber
Test initiated by System RTS
Fail reason: bad frame pulse on fiber
After having this issue on several other PM's, I found out thru another forum that capacitor 'C1' was found to have problems on version 7 and earlier, and after pulling and replacing it with a version 8, I haven't had any problems on the shelf units/PM's that I R&R'ed from. So, in a nutshell, if you are experiencing any P-Side failures due to the DS 512 Link Paddleboard card (NT6X40GA), in theory, you should be o.k. with a version 8 or better.