Technical Documentation
T640 Power System Description
The router supports two load-sharing DC power supplies, located at the lower rear of the chassis. The power supplies connect to the midplane, which distributes different output voltages produced by the power supply to the router components, depending on voltage requirements.
The T640 router supports the DC power supplies in Table 1.
 | Note: Mixing power supplies with a different number of inputs in the same router is supported only during upgrade. Mixing different types of power supplies is not supported during normal operations. |
Table 1: Supported Power Supplies
Name | Model Number | First Supported Junos OS Release |
|---|---|---|
Two-input 160-A DC power supply (EOL PSN-2010-01-644) | PWR-T-DC | 5.3 |
Three-input 240-A DC power supply See the T640 Three-Input 240-A DC Power Supply Description. Note: For the T640 router, this power supply is supported only in 2-INPUT mode. | PWR-T1600-3-80-DC | 8.5 |
Four-input 240-A DC power supply | PWR-T1600-4-60-DC | 10.0 |
