I'm new to the whold Cisco world and have a question regarding how our WAN here at my company was previously setup. We have a frac. T1 that spits out to our 3 WAN locations. Traffic passes through a Cisco 2500 series router and then into a Adtran DSU/CSU. All 3 WAN locations have a similar DSU/CSU and a Cisco 1600 series router. Now, on the back of the 2500 series router (LAN side) I see there are 4 serial ports (only 3 being used), 2 say "Serial X", 2 say Serial X A/S (X being a arbitrary number). 2 of my WAN location's connections come out of the DSU/CSU and plug into the non-A/S or Syncronous ports. My third WAN location plugs into an A/S or asyncronous port. My question is, will this difference in ports affect any of my WAN locations and if so, how? (My question stems around the lack of speed at my WAN locations and I'm trying to track down the problem.) Thanks in advance. Chris