Does anybody have experience having a T1 circuit with PPP encapsulation getting only 1290 Kbps maximum throughput looking at "sh int" result from cisco router or MRTG ? This is the explanation our upstream provider gave us: You have a 1.536Mbps port. However, there is the overhead from PPP and the translation overhead which takes place in all circuits. Judging by your settings that limit ends up somewhere between 1.3 and 1.4. This overhead would be the non-data portion of cells or frames for example. For example, you might have 1.3 Mbps of data which gets framing or cell information appended onto it before sending taking up additional bandwidth. It is to be expected in all circuits. Thank you for your help. Tony S. Hariman http://www.tsh.or.id Tel: +62(21)574-2488 tonyha@compuserve.com