I have an example here.
Theres a router which has 2 serial connections configured and an ethernet connection. The Ethernet goes to a catalyst 4507 on the LAN.
One of the serial connections is s0(192.168.99.10) and the second being s1(192.168.99.15).
S0 and S1 have connections to 2 seperate T1 DSU/CSU units (data ports). 1 of the DSU/CSU units are connected to an HRE422 and the other is connected to an HRE420 (I believe these are pairgains)
In the above example, does this router have 2 dedicated T1 connections to the remote network? I'm not too experienced with the cabling structure, but to me it looks as though theres 2 t1 lines. If this is true, how can I tell which line is being used and if one is just there for a backup? I would also like to know how I can monitor and view the bandwidth on the T1 line?