Looking for some references for embedded telecom board

If you're interested in high speed digital, get a copy of High Speed Digital Design.

Key points:

• The main determining factor of you circuit is the rise time of the logic. Even if you operate at a slow clock rate, fast edges can create problems.
• The maximum rise time of your system then gives you the critical length of your circuit. Essentially if the propagation delay of your signal over the length of the circuit is longer than the rise time of the signal, you need to worry about the high frequency aspect of the design.
• If it turns out the critical length is shorter than the circuit layout, then you need to use controlled impedance layout. This includes:
  • Track geometry (track width and hight above a ground plane) to give the circuit a defined characteristic impedance.
  • Terminating the drivers and/or recievers with the line's characteristic impedance.

You need to break down ALL of the supplies into Voltage, Amperage and Wattage. - why don't you tabulate that in the question?

Once you have that then you can calculate the total wattage, and compare it against the various options you have for required Voltages vs. the current at each voltage.

You should expect to over size each supply by 15% (although others may have a different opinion on that)