In the DC power configuration, the MX480 router contains either two or four DC power supplies (see Figure 1) located at the rear of the chassis in slots PEM0 through PEM3 (left to right). You can upgrade your DC power system from two to four power supplies. Four power supplies provide full …

In the low-line (110 V) AC power configuration, the MX480 router contains three or four AC power supplies (see Figure 1), located horizontally at the rear of the chassis in slots PEM0 through PEM3 (left to right). Each AC power supply provides power to all components in the router.

Calculate the power requirement. Evaluate the power budget. Calculate input power. Calculate thermal output (BTUs) for cooling requirements. Both normal-capacity and high-capacity MX480 chassis with DC power supplies are zoned, meaning that certain components are powered by specific power supplies (see Table 4 for information on zoning).

It should be able to run on a single PEM since the high power PEM capacity of 2050 W is greater than the 1441 W allocated. Unfortunately the MX480 is live so I can't confirm if that is true or not.

要摆脱底盘警报，您可以尝试重新启动Juniper MX480 (在维护窗口中)，如果您的底盘警报/陷阱正在困扰网管。 当您重新启动的MX480，系统会相信，它现在有2 x PEM最初安装后，启动，因此不会报告第三个PEM丢失。 下面是重新启动整个底盘的命令:-

2022年7月22日 · Assuming this is not a fully populated chassis then it looks like a correct output. Only one PEM is handling all the load with the other 3 in standby. Hope this helps.

2020年5月8日 · MX480 has 2 zones (0 and 1) and there should be one PEM in each zone (MAX 2 supported) for router to be functional. In your case you have inserted both the PEM's in zone 0 which is triggering the alarm.

2020年10月14日 · I have an alarm showing up on an MX480 after removing unused PEMs: "PEM 2 Absent". The mx480 only has 2 FPCs populated, which keeps it fully redundant with 2 PEMs online (each zone is 25%). However, I would like to clear the alarm showing up so it stops triggering our monitoring system, and I am not having luck finding documentation on clearing it.

To maintain proper cooling and prevent thermal shutdown of the operating power supply unit, each power supply slot must contain either a power supply or a blank panel. If you remove a power supply, you must install a replacement power supply or a …

Locate a replacement power cord with the type of plug appropriate for your geographical location (see “AC Power Cord Specifications for the MX480 Router” on page 49).