Various little unlabeled squares in the outline above are transformers and similar parts.

My Thoughts:
   This adapter seems to be on a par with the IBM LANstreamer. Both adapters offer at least 40Mb/sec streaming (if your system supports it) and busmastering technology. However, the Smart Ringnode does have some advantages that make it better in some environments. More OSes have built in drivers and this adapter is known to work in lower end systems where the IBM streamer offerings may not work. This adapter also isn't affected by the nasty Windows NT bug that prevents IBM Streamer family adapters from working until an NT service pack is applied to fix the problem.

Also supported (if you use it) is auto-detection of ring speed. You can also manually force the adapter to a given ring speed.

For me, these Smart Ringnode adapters have also been much easier to find than the IBM Streamer adapters. I have only a few Streamers, but at least six Smart Ringnodes.

Oh, and the red plastic tabs sure do make for an adapter that gets your attention...

I/O Location & Interrupt Level
   Up to eight MC Ringnodes may be installed. Each Ringnode must use a different I/O Location. It is recommended that each adapter also uses a different Interrupt Level, although it is allowable for adapters to share an Interrupt Level if necessary. 
      <I/O 0A20-0A3F, Interrupt 3>, I/O 0A20-0A3F, Interrupt 10, I/O 0A20-0A3F, Interrupt 2, I/O 1A20-1A3F, Interrupt 10, I/O 1A20-1A3F, Interrupt 2, I/O 1A20-1A3F, Interrupt 3, I/O 2A20-2A3F, Interrupt 2, I/O 2A20-2A3F, Interrupt 3, I/O 2A20-2A3F, Interrupt 10, I/O 3A20-3A3F, Interrupt 3, I/O 3A20-3A3F, Interrupt 10, I/O 3A20-3A3F, Interrupt 2, I/O 0E20-0E3F, Interrupt 10, I/O 0E20-0E3F, Interrupt 2, I/O 0E20-0E3F, Interrupt 3, I/O 1E20-1E3F, Interrupt 2, I/O 1E20-1E3F, Interrupt 3, I/O 1E20-1E3F, Interrupt 10, I/O 2E20-2E3F, Interrupt 3, I/O 2E20-2E3F, Interrupt 10, I/O 2E20-2E3F, Interrupt 2, I/O 3E20-3E3F, Interrupt 10, I/O 3E20-3E3F, Interrupt 2, I/O 3E20-3E3F, Interrupt 3 

Arbitration Level
   The Arbitration Level need only be changed if it is in conflict with another adapter. 
     <Level 8>, Level 9, Level 10, Level 11, Level 12, Level 13, Level 14, Level 5, Level 6, Level 7, Disabled 

Transfer Mode
   Streaming Enabled permits host bus data transfer rates up to 40 MBytes/s in machines which      support this option. Streaming Disabled permits host bus data transfer rates up to 20 MBytes/s. 
   With Fair mode selected, the MC Ringnode enters an  inactive state when it releases the bus. The  system can service any other arbitrating devices in order of priority before the Node requests the bus again. In Unfair mode, the Node will immediately re-request the bus after releasing it. 
  <Streaming Disabled (Fair)>, Streaming Enabled (Fair), Streaming Disabled (Unfair), Streaming Enabled (Unfair) 

ROM Size & Location
 If you have an option ROM installed, set this in accordance with the instructions provided with it. 
     <Disabled/Not installed>, 8K, C4000-C5FFF, 8K, C6000-C7FFF, 8K, CC000-CDFFF, 8K, CE000-CFFFF, 8K, D4000-D5FFF, 8K, D6000-D7FFF, 8K, DC000-DDFFF, 8K, DE000-DFFFF 
   Rem'd options: 32K, C0000-C7FFF, 32K, C8000-CFFFF, 32K, D0000-D7FFF, 32K, D8000-DFFFF, 16K, C4000-C7FFF, 16K, CC000-CFFFF, 16K, D4000-D7FFF, 16K, DC000-DFFFF 

Ring Speed
   You must use the same ring speed as the ring you are connecting to. Incorrect ring operation will result from selecting the wrong ring speed. 
    <Not selected>,  4 Mbit/s, 16 Mbit/s 

Cable Type
   Select the appropriate option according to the lobe cable connector. Type 6 uses the 9-pin D-type (J1); type 3 uses the RJ45 phone-jack (J2) 
    <DB9  connector, J1 (STP)>, RJ45 connector, J2