UniFi Switch 16 PoE

Ubiquiti · rack switch, 1U · USW-16-PoE

what it is

A managed switch for a 19-inch rack, 1U high: sixteen gigabit ports and two SFP fiber transceiver slots. A 1.3-inch touchscreen on the front panel. Steel enclosure 442 × 200 × 44 mm, weight 2.8 kg — shallow for rack equipment, it fits in wall-mount racks.

Only eight of the sixteen ports deliver PoE, and the budget is 42 W for the whole device, with a maximum of 32 W per port. In practice that means one PoE+ access point or a few smaller devices — not eight cameras.

Cooling is passive, with no fan.

what we read from it

The state of each of the eighteen ports separately, and for the first eight also power draw.

• PoE draw per port and the total for the device. With a 42 W budget this is not a theoretical number: a second access point connected to this switch may fail to come up, and the symptom will look like an access point failure, not a lack of power.
• Link drop and errored frame counters per port.
• Spanning tree changes — on an access switch usually the first sign of a loop.
• CPU and memory load.
• Which device sits in which port, together with its MAC address.

port layout

The sixteen copper ports sit in two rows of eight, in two blocks of four columns. Numbering runs down, then right: 1, 3, 5… on top and 2, 4, 6… on the bottom.

The line dividing the port frame coincides here with the PoE split: the eight ports on the left deliver PoE+, the eight on the right do not. This makes the model convenient in this respect — on most switches the PoE boundary runs through the middle of a block and is not visible on the enclosure.

The two SFP slots are stacked at the right edge: the top one is port 17, the bottom one 18. The touchscreen is at the left edge, the reset button at the right. The rear panel has only the power inlet — there are neither fans nor a console port.

what to watch out for

• There is no cable test. The UniFi Network 10.6.106 controller has no such function at all.

what we cannot read

• PoE on ports 9–16 — they do not have it. This is a hardware limit.
• Internal temperature — the model has no sensor, so a missing value is not a reading failure. With passive cooling and a rack without airflow, it is worth keeping this in mind.
• PoE draw history over time.

transceivers tested in this device

Transceivers we checked in this device, and whether the device showed their optical diagnostics (temperature, power, alarm thresholds):

• MikroTik S-31DLC20D (1000BASE-LX), firmware 7.4.1.16850: diagnostics read (1 units).
• OPTIC SFP-S-31DLC20D (1000BASE-LX), firmware 7.4.1.16850: diagnostics read (1 units).
• Ubiquiti UF-MM-10G (10GBASE-SR), firmware 7.4.1.16850: diagnostics read (1 units).
• Ubiquiti UF-MM-1G (1000BASE-SX), firmware 7.4.1.16850: diagnostics read (1 units).
• Ubiquiti UF-SM-1G-S (1000BASE-BX), firmware 7.4.1.16850: diagnostics read (2 units).
• Unbranded GLC-LH-SM (1000BASE-LX/LH), firmware 7.5.15.17146: diagnostics not shown (1 units).

All transceivers and switches in one place, with filters: what each device shows.

full parameter list from the controller interface

The list shows WHAT the device exposes — including parameters we do not use ourselves. There are no values here at all: it is a catalog of capabilities, not a reading from anyone's network. It is not a closed list either — explanation below the table.

514 parameters

List source: reading of 5 working units (as of 2026-09-27). The list is the sum of what we observed — more units reveal more parameters, so numbers for different models are not directly comparable.

full list of parameters read via SNMP

This list comes from a different reading path than the controller list above. These are objects the device itself returns over SNMP (names from MIB files). There are no values here, and no port numbers either.

111 parameters

SNMP list source: reading of 2 units (as of 2026-10-18); sample counted separately from the controller list.