[c-nsp] Help Understanding Traffic Rates for different interfaces

[Thanh_Mai at 3com.com]

Multiple Part Question:
1) I know an Ethernet frame has a preamble of 8 bytes and a minimum of 12
bytes for the inter frame gap. With an FE line rate of 100Mbps and 64 byte
packets only, the maximum rate that is possible is
100*(64/(64+8+12))=76.19Mbps.
Where can I find similar (maximum rate per packet size) calculations for
T1/T3/E1/E3/POS/ATM, etc? If you have this information, I'd really
appreciate it if you pass it along. I can't find it anywhere.
2) If a T1 is 24 channels and 1.544Mbps and a T3 is 28 T1s, How is the rate
for a T3 44.736Mbps? It's obvious that you can't just simply multiply 28 by
1.544. So what am I missing?

Thanks,
-Thanh