Switch Expansion and Power Modules

Identify the chassis before the module

Modules are made for a specific chassis, not for switches in general. Listings name the supported line, such as Aruba 2920 or the E5400 and E8200 zl series, and a newer module revision, marked v2, may need a recent management module or firmware. Find the model and slot type on your existing switch, then match the exact part number rather than the port count. Titles in this area also include server-side options, so read the full title before assuming a part fits a switch.

Power supplies, optics and PoE budget

Power modules are matched by wattage and slot style: a flex-slot unit of 1400 W is one example, and it will not fit every chassis. PoE ports draw from that same supply, so adding PoE+ line cards means checking the total budget. Optical modules are matched by cabling: 850 nm for multi-mode and 1310 nm for single-mode fiber. Speeds such as 10 Gbit/s are common, but the connector and range still have to match the other end.

Questions about Switch Expansion and Power Modules

Can I put any SFP or QSFP module in a switch module slot?

No. Modules must match the cage type and speed, and some switches accept only coded modules. Check the compatibility notes for your switch model, and confirm the fiber type at both ends.

How do I find the right part number?

Check the label on your existing module or power supply, or the chassis model and slot description. Match the full part number including any revision suffix, such as v2, because similar-looking modules can differ in what they support.

Does adding PoE ports need a bigger power supply?

Often, yes. PoE devices draw their power from the switch supply, so total wattage limits how many ports can run at full PoE+ output. Add up the devices' needs and compare them with the supply's PoE budget.