what's the difference between PEM and PS?

[Ray Han]

what's the difference between PEM and PS?

PEM : Power entry module

PS : Power supply

who's know about this?

[Shashank Singh · Accepted solution]

There is no real difference. PEM and PS are the modules that supply power to the switch/router. In some cases they also perform the AC to DC conversion as required by some platforms.

For example, PEM was replaced by PS after it became EOL in case of 7600 routers.

http://www.cisco.com/en/US/prod/collateral/routers/ps368/prod_end-of-life_notice0900aecd806b0baa.html

End-of-Sale Product Part Number

PEM-20A-AC

Power Entry Module for CISCO7606 (1900W Pwr Sup)

Replacement Product Part Number

PWR-2700-AC

2700W AC power supply for CISCO7606

In case of some routers (10k series), the power unit is still called PEM.

Cheers,

Shashank

P.S. Please rate helpful posts.

[Ray Han]

Thanks for your help.

it's a good help and have a good time ^^

[Latchum Naidu · Accepted solution]

Hi,

DC Power Entry Module:

The MGX 8850 or MGX 8850/B switch can accept power from a -48 VDC (-42 to -56 VDC) source that connects to one (primary) or two (secondary/redundant) -48 VDC PEMs. Each DC PEM must be connected to a dedicated 60 A regulated source.

AC Power Supply Tray:

The Cisco MGX 8850 switch can accept power from a 220 VAC (180 to 254 VAC) source that connects to an optional AC power supply tray, The optional AC power supply tray houses up to six AC power supplies and is installed directly below the air intake plenum. The AC power supplies convert 220 VAC to -48 VDC power for the switch.

Hope this cleare you...

Please rate the helpfull posts.

Regards,
Naidu.

[Ray Han]

Thanks for your comments

it's a great help.

Regards

Sanghee