How do I calculate the power and current requirements for an MSE 8000?

Chassis calculator

Use this calculator to determine the power requirements for your MSE 8000 chassis and blades. (To calculate power requirements manually, see the information later in this article.)

Slot 1:   MSE 8050 - Supervisor
Slot 2:   Empty slot MSE 8220 - VCR MSE 8310 - ISDN4 MSE 8321 - ISDN8 MSE 8330 - Serial GW MSE 8420 - Media MSE 8510 - Media2 MSE 8710 - Telepresence Media 820 - Telepresence

Slot 3:   Empty slot MSE 8220 - VCR MSE 8310 - ISDN4 MSE 8321 - ISDN8 MSE 8330 - Serial GW MSE 8420 - Media MSE 8510 - Media2 MSE 8710 - Telepresence Media 820 - Telepresence

Slot 4:   Empty slot MSE 8220 - VCR MSE 8310 - ISDN4 MSE 8321 - ISDN8 MSE 8330 - Serial GW MSE 8420 - Media MSE 8510 - Media2 MSE 8710 - Telepresence Media 820 - Telepresence

Slot 5:   Empty slot MSE 8220 - VCR MSE 8310 - ISDN4 MSE 8321 - ISDN8 MSE 8330 - Serial GW MSE 8420 - Media MSE 8510 - Media2 MSE 8710 - Telepresence Media 820 - Telepresence

Slot 6:   Empty slot MSE 8220 - VCR MSE 8310 - ISDN4 MSE 8321 - ISDN8 MSE 8330 - Serial GW MSE 8420 - Media MSE 8510 - Media2 MSE 8710 - Telepresence Media 820 - Telepresence

Slot 7:   Empty slot MSE 8220 - VCR MSE 8310 - ISDN4 MSE 8321 - ISDN8 MSE 8330 - Serial GW MSE 8420 - Media MSE 8510 - Media2 MSE 8710 - Telepresence Media 820 - Telepresence

Slot 8:   Empty slot MSE 8220 - VCR MSE 8310 - ISDN4 MSE 8321 - ISDN8 MSE 8330 - Serial GW MSE 8420 - Media MSE 8510 - Media2 MSE 8710 - Telepresence Media 820 - Telepresence

Slot 9:   Empty slot MSE 8220 - VCR MSE 8310 - ISDN4 MSE 8321 - ISDN8 MSE 8330 - Serial GW MSE 8420 - Media MSE 8510 - Media2 MSE 8710 - Telepresence Media 820 - Telepresence

Slot 10: Empty slot MSE 8220 - VCR MSE 8310 - ISDN4 MSE 8321 - ISDN8 MSE 8330 - Serial GW MSE 8420 - Media MSE 8510 - Media2 MSE 8710 - Telepresence Media 820 - Telepresence

If you know the efficiency of your rectifier, enter the value here to find AC power and current. For example, for 90% efficiency, enter the value 90:

Calculator results

The results are as follows (values are rounded up):

Requirements	Value
DC power (Watts)
DC current (Amps)
Rectifiers required per power shelf

Calculator results for AC power

Using the rectifier efficiency value that you entered above, the AC power and current results are as follows:

Requirements	Value
AC power (Watts)
240V P.S.U. current draw (Amps)
110V P.S.U. current draw (Amps)

Understanding power requirements

The power requirements for an MSE 8000 chassis vary significantly depending on the number of blades installed and their individual power requirements. For example, a chassis that is fully loaded (nine MSE 8510 Media2 blades) would require 4kW of power. In contrast, a chassis that is minimally loaded with one MSE 8420 Media blade would require 0.52kW of power.

Each blade and fan tray has a power requirement figure, which is available from a label on the blade or from the following table.

Calculating the current draw from a 48V DC power supply unit

To calculate the current that will be drawn from your 48V DC power supply unit:

1. Use the table above to find the DC current requirement for each blade and fan tray to be installed in your MSE 8000.
2. Sum these figures to give a total DC current requirement.

Example. The current drawn in the instance outlined above would be:

1.3 + 3.5 + 3.5 + 7.3 + 7.3 + 1.3 = 24.2 Amps

So the total current drawn will be approximately 25 Amps.

Calculating the number of rectifiers needed

To calculate the number of rectifiers needed:

1. Calculate your total DC current requirements using the information above.
2. Use the following table to determine the number of rectifiers required:

Total DC current requirement (Amps)	Rectifiers required per power shelf
20	1
40	2
60	3
80	4

Example. In the chassis example detailed above, there was a total DC current of 25 Amps meaning that two rectifiers would be needed per power shelf.

This article applies to the following products:

• Cisco TelePresence MSE 8000 Chassis