Questions tagged [power]

For questions about power and power management on network devices. It should only be used for on topic network devices. For instance, you have a switch with PoE, but the power supply might be faulty.

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HP ProCurve Switch 4100 series - Checking PSU status & S/N from the CLI

Do you know if there is any CLI command available on the very old HPE Procurve 4108gl/J4865A switches where you can see how many PSUs are installed in the chassis, what's their current status and ...
9
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1answer
3k views

Is wifi power consumption related to password length

For wifi the Max password length is 63 characters. When I choose such a long password will this lead to notably higher power consumption of the network device (router, smartphone, ...)? I would guess ...
0
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1answer
62 views

mx480 “PEM 3 absent” alarm

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%). ...
0
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1answer
57 views

PEM Modules Redundancy in Juniper SRX3600 series Firewall

We have Juniper SRX3600 running in our network. At the moment only 2 x PEM Modules (AC Power Supply) are installed in the chassis while other 2 x PEM are not. This is shown below from the output of '...
2
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2answers
51 views

Networking switch boxes distance from 480v transformers

I am working on a network layout for a manufacturing plant and ran into a situation I am just not experienced in. We have 6 steel beams from the ground to the ceiling that we are planning on mounting ...
2
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2answers
729 views

Is it really necessary for APs to constantly send beacon frames (always be in “discovery mode”)?

Why do wireless APs constantly transmit (e.g., with a beacon interval of 10×/sec.), even when no devices are connected to them? Doesn't that just cause needless RFI? Is it really necessary to ...
6
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1answer
2k views

Cisco 3750X Power Cable

I received a Cisco 3750X the other day. I went to go plug it in for testing and found that the standard three prong female power connector is no longer compatible with the power supply. Cisco has ...
5
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2answers
81 views

Network Switch Power Isolation

I run a small office network that uses TP-LINK T1600G-28TS (TL-SG2424) JetStream switches. The office is across two buildings, each fed by a different phase of power. We've recently installed HD ...
1
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1answer
145 views

Feeding a PoE capable device with variable power supply over TIA568 A cable (DC spares)

The purpose of such a variable power over Ethernet supply would be to test network equipment that are receiving power over PoE under condition of conditions of low voltage or current and determining ...
1
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1answer
90 views

Cisco C3750G Power On Failure

I have been using my C3750G for a while now. It has been used normally and hasn't been exposed to any excess heat but for some reason when I issued the 'reload' command the other day the switch didn't ...
3
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2answers
1k views

How close can Ethernet cables be to power line if in parallel?

How close can unshielded CAT 5e/6/6a cables be in parallel to 110V power lines in rooms of common residential/commercial buildings before interference becomes an issue? If proximity between the two ...
3
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2answers
16k views

show current power consumption Cisco 3650 IOS 3.07.04E

What command can I issue to see the current power (POE and System Power) on a Cisco 3650 Switch running IOS 3.07.04E. Sh Env Power #shows me power supplies, not usage. Sh Power Inline #show me the ...