Maximum TCP throughput calculations:
There are several important things what you should know before reading this.
Please check TCP/IP fundamentals at  http://www.tcpipguide.com/free/index.htm
Common window sizes:
Standard 64KB
Windows XP 17.5KB
FTP 8KB
SCP 64KB
SMB 16K/4K

TCP throughput:

http://wand.net.nz/~perry/max_download.php << this is a calculator, it can show you the throughut weakness
http://www.babinszki.com/Networking/Max-Ethernet-and-TCP-Throughput.html

Data throughput in TCP based on TCP window size and latency:
FTP TCP window 8KB -> 65356bit
RTT=60ms=0.06s
Maximum TCP transfer = 65356bit/0.06s=1.038Mbps

General TCP window 64KB -> 524288bit
RTT=60ms=0.06s
Maximum TCP transfer = 524288bit/0.06s=8738133,33bps = 8.533.33Mbps

DataMover TCP window 256KB -> 2097152bit
RTT=60ms=0.06s
Maximum TCP transfer = 2097152bit/0.06s=33.33Mbps

Throughput can never exceed window size divided by round-trip time.
window = 17520byte = 140160
rtt 60ms = 0.06s
Max link throughput (based on window and rtt) = 140160bit/0.06s=2336000 = 2281,25kbps

The capacity of a pipe is its bandwidth multiplied by round-trip time.
BW = 2Mbps = 2097152bps
rtt = 60ms = 0.06s
Max link capacity (based on BW and rtt) = 125829,12bit = 15728,64byte

Formula to calculate the optimal TCP window size:
Bandwidth-in-bits-per-second * Round-trip-latency-in-seconds = TCP window size in bits / 8 = TCP window size in bytes
BW = 2Mbps = 2097152bps
rtt = 60ms = 0.06s
2097152bps * 0.06s = 125829,12bit = 15728,64byte — ideal window size

Formula to calculate Maximum Latency for a desired throughput
TCP-window-size-bits / Desired-throughput-in-bits-per-second = Maximum RTT Latency
TCP window size = 17520byte = 140160bit
desired BW = 2Mbps = 2097152bps
140160bit / 2097152bps = ~0.067ms is the max RTT for the desired 2M throughput

Please consider that these values are IP packets, not frames (or Layer2 bandwidths) or the packets’ data transers.