Yes, you can assign addresses to those interfaces .... however, unless the interface is up, it will have no effect.
No, you cannot connect Token-Ring back-to-Back (well, you can, but it doesn't work).
To use the TR interfaces, you'll need some flavor of Multi-Station Access Unit (MAU) and the correct cables for the type of MAU-to-router (router = DB9 female, I believe).
Token-Ring was designed to be self-powered; there are "phantom voltages" on the different pair to accomplish three different voltage levels to the (originally passive) MAU.
The 802.5 protocols are also very specific for testing before entering the ring ... back-to-back won't work because those tests can't pass without a MAU.
IBM and Synoptics both had some devices that needed a "Token-Ring Crossover" cable (aka "The Yellow Cable"), but it is not supported (and will not work) in a host-host configuration.
Fortunately, MAUs on eBay and other NetJunk sites are pretty cheap. A MAU might also be a TR switch.
IBM 8228 was the original (uses the goofy bi-gendered connector), Thomas Conrad also made some decent MAUs (many/most with RJ45-style connectors).
When you get the MAU, keep in mind that RI/RO (Ring In / Ring Out), expecially on RJ45-style ports, will need to be terminated in some form or fashion (some units have a switch to terminate the port).
Units that have the IBM Data Connector will self-terminate.
Make sure you use the right cable for the connectors you have (IBM DC/DB9 or DB9->RJ45). The RJ45-style connectors *probably* also have to be BALUNs, Shielded Twisted Pair (STP) is 150 ohm cable, UTP (i.e., Cat{anything}) is usually 100 ohm cable.
You may be able to fake the connection to bring up the interface on the router. Token-Ring uses pins 4&5, 3&6 ... essentially a loopback, but there wouldn't be much sense in it.
The IBM Data cable for Token-Ring will also work as a loopback.
Good Luck
Scott
