I have problem with max. speed on serial ports (WIC-2T) installed into Cisco1721 and Cisco1760. Let's say I am using only Fastethernet ports and one serial connection (WIC-2T one or two port used). Is 2 Mb/s per port max. speed I can achieve? Can I have 4 Mb/s on one port and 0 Mb/s on the secound?