No no, thats the isolation transformer that physically isolates the network interface from the chip.
I think there was another thread on this chip failure and replacing getting a NIC back online. If you plug the cable in backwards, it likely kills those isolators. If it killed the main IC, then the ethernet driver would never see the card.
It appears both the AUI card has the same isolator as the main ethernet card.
This chip is used for ALL interfacing, it physically isolates the network interfaces from the main controller IC. Why they do this? I dunno. maybe impedance reasons, maybe lightning reasons, I dunno. But if it openes up, then you cant see any networks.
Here I linked a datasheet you can use to measure in ohms the devices. if one of the transformers is open then youll know it.
http://www.datasheetarchive.com/dlmain/Datasheets-9/DSA-162411.pdf
Also when you plug a cable in backwards, Does it kill the plate? or does it kill the card? or does it kill both? If its one or the other, You know where to look.
I think there was another thread on this chip failure and replacing getting a NIC back online. If you plug the cable in backwards, it likely kills those isolators. If it killed the main IC, then the ethernet driver would never see the card.
It appears both the AUI card has the same isolator as the main ethernet card.
This chip is used for ALL interfacing, it physically isolates the network interfaces from the main controller IC. Why they do this? I dunno. maybe impedance reasons, maybe lightning reasons, I dunno. But if it openes up, then you cant see any networks.
Here I linked a datasheet you can use to measure in ohms the devices. if one of the transformers is open then youll know it.
http://www.datasheetarchive.com/dlmain/Datasheets-9/DSA-162411.pdf
Also when you plug a cable in backwards, Does it kill the plate? or does it kill the card? or does it kill both? If its one or the other, You know where to look.