TP-Link TL-SM311LM
TP-Link · SFP transceiver, 1000BASE-SX · TL-SM311LM
what it is
A 1000BASE-SX transceiver (TP-Link) in the SFP form factor, part number TL-SM311LM. Works over two multimode (MM) fibers (duplex), 850 nm. Reach per manufacturer: 550 m. Units examined: 1.
what we read from it
A switch that reads diagnostics from other transceivers showed no values for this one — the transceiver most likely has no optical diagnostics. Its identity can be read: manufacturer, part number and serial number.
how we checked
The result depends on what the transceiver was read with — the same switch model in a different installation can show different data. That is why each reading is recorded separately:
- UniFi Switch 24, firmware
7.4.1.16850— transceiver fields in the UniFi controller, 2026-10-17: diagnostics not shown (1 unit). Visible data: transmitter fault indication (TX_FAULT), standard (compliance code), identity (manufacturer, part number, serial number, revision). Cable test (production link at the customer site): link comes up 1 of 1; diagnostics reliability cannot be assessed 1 of 1; alarm after unplugging not checked — we do not unplug at the customer site.
The same transceiver in other switches and a comparison with other models: what each device shows.
what we cannot read
- Manufacturing date and wavelength — not visible when read through the controller; they are in the transceiver memory.
- Temperature, optical power and laser current.
parameters the transceiver returns
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.
6 parameters
| parameter | type |
|---|---|
numer_czesci | text — part number (PN) |
numer_seryjny | text |
producent | text — vendor name from transceiver memory |
rewizja | text |
usterka_nadajnika_tx_fault | boolean |
zgodnosc | text — standard (e.g. 1000BASE-LX) |
This is not a closed list. It comes from reading a unit we had access to — it shows what we managed to retrieve, not everything the device can return. A different firmware version, hardware variant or reading path can expose fields that are not here. If you are interested in a specific unit and a specific value — please ask; there is a good chance it can be obtained, even if you do not see it below.
List source: reading of 1 working unit (as of 2026-10-19). The list is the sum of what we observed — more units reveal more parameters, so numbers for different models are not directly comparable.