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A storage temperature and two humidity ranges, and no operating temperature

TP-Link TL-SM311LM, multimode gigabit SFP, 850 nm, 550 m stated

The module of a switch maker sold for other makers’ switches, with the shortest specification on this shelf: a wavelength, a distance and an LC socket, plus a storage temperature standing where an operating one should be.

TP-Link TL-SM311LM multimode gigabit SFP module with an LC optical port

TP-Link TL-SM311LM, multimode gigabit SFP, 850 nm, 550 m stated

The module of a switch maker sold for other makers’ switches, with the shortest specification on this shelf: a wavelength, a distance and an LC socket, plus a storage temperature standing where an operating one should be.

Module form factor
SFP, named a MiniGBIC in the first bullet — the gigabit cage. The second bullet places it on a switch with SFP ports
Module rate
Gigabit — stated as such in the title, with the first bullet calling it a multi-mode MiniGBIC module. No figure in megabits or gigabits per second is printed anywhere on the page
Optical or copper medium
Optical — multi-mode, stated in the title and in the first bullet, with the second naming enterprise fibre networks, campus fibre networks and ISP networks as its use
Fibre type
Multimode — stated in the title and in the first bullet. The grade is not published on the listing: no OM1, OM2, OM3 or OM4 designation appears, and the third bullet gives 550 m at 850 nm in its place
Stated reach
550 m — stated in the title as a reach of up to 550 m, and in the third bullet as a transmission distance of 550 m
Connector type
LC — stated in the title as an LC interface. Whether that is a duplex pair or a single position is not published on the listing, and no bullet returns to the subject
Wavelength
850 nm — stated in the third bullet, in the same line as the distance
Vendor coding stated
Not published on the listing — the title claims compatibility with Cisco, Meraki, Ubiquiti and Mikrotik, and no coding, no part number and no module list is named against any of them. This is a switch maker’s own module, offered for other makers’ switches
Operating temperature range
Not published on the listing — the fourth bullet publishes a storage temperature of -40 to 85 °C, an operating humidity of 10 to 90 % relative and a storage humidity of 5 to 90 % relative, and never the temperature the module is meant to work at
Amazon reference
B001800S6M (same reference on 6 Amazon marketplaces)
EAN
1210002612036
  • Made by a switch maker, and the model designation in the title is that maker’s own catalogue number
  • Publishes a wavelength beside the distance, which is the pair a multimode reach claim needs
  • No operating temperature anywhere, on a page that finds room for two humidity ranges

Best for: A short multimode run inside one building, into a switch that accepts third-party modules without argument.

≈ £22 / 17 €
Check price on Amazon

Specifications

Module form factor
SFP, named a MiniGBIC in the first bullet — the gigabit cage. The second bullet places it on a switch with SFP ports
Module rate
Gigabit — stated as such in the title, with the first bullet calling it a multi-mode MiniGBIC module. No figure in megabits or gigabits per second is printed anywhere on the page
Optical or copper medium
Optical — multi-mode, stated in the title and in the first bullet, with the second naming enterprise fibre networks, campus fibre networks and ISP networks as its use
Fibre type
Multimode — stated in the title and in the first bullet. The grade is not published on the listing: no OM1, OM2, OM3 or OM4 designation appears, and the third bullet gives 550 m at 850 nm in its place
Stated reach
550 m — stated in the title as a reach of up to 550 m, and in the third bullet as a transmission distance of 550 m
Connector type
LC — stated in the title as an LC interface. Whether that is a duplex pair or a single position is not published on the listing, and no bullet returns to the subject
Wavelength
850 nm — stated in the third bullet, in the same line as the distance
Vendor coding stated
Not published on the listing — the title claims compatibility with Cisco, Meraki, Ubiquiti and Mikrotik, and no coding, no part number and no module list is named against any of them. This is a switch maker’s own module, offered for other makers’ switches
Operating temperature range
Not published on the listing — the fourth bullet publishes a storage temperature of -40 to 85 °C, an operating humidity of 10 to 90 % relative and a storage humidity of 5 to 90 % relative, and never the temperature the module is meant to work at
Amazon reference
B001800S6M (same reference on 6 Amazon marketplaces)
EAN
1210002612036

On the listing

A gigabit multimode SFP module described as a multi-mode MiniGBIC, with an LC interface, a transmission distance of 550 m and a wavelength of 850 nm; a stated use on switches with SFP ports, for enterprise fibre networks, campus fibre networks and ISP networks; compatibility claimed in the title with Cisco, Meraki, Ubiquiti and Mikrotik; and a fourth bullet giving a storage temperature of -40 to 85 °C, an operating humidity of 10 to 90 % relative and a storage humidity of 5 to 90 % relative, all non-condensing.

850 nanometres over 550 metres, and the grade that is not named

Four bullets, and the technical content of all four fits in a line: 850 nm, 550 m, LC, multimode.

That is not nothing. A wavelength and a distance printed together are more than two of the seven modules here manage. But multimode fibre comes in grades, and the grade is what a distance figure is measured against. The page never names one. So 550 m arrives as a number without the glass it was worked out in, and a buyer with fibre already in the wall has no way to tell whether the figure describes their run.

A storage temperature standing where the operating one should be

The fourth bullet is a curious piece of drafting. It publishes a storage temperature. It publishes an operating humidity. It publishes a storage humidity. It does not publish an operating temperature.

Whoever wrote it had the table open — you do not produce two humidity figures by accident, and the pair of them proves the operating column exists. The one line a buyer would use is the one that did not make it onto the page.

Two of the seven modules on this shelf publish a working range in plain figures. This is not one of them, and it is the only one that publishes a temperature of a different kind in the same breath.

A switch maker’s module for other makers’ switches

The interesting thing about this listing is who wrote it. TP-Link builds switches, and this module carries a TP-Link catalogue designation. The title then sells it for Cisco, Meraki, Ubiquiti and Mikrotik equipment.

That is a compatibility claim like any other on this shelf, made by the party selling the module rather than the party selling the switch, and it names four brands without naming a coding, a part number or a module list. The document that decides it is still the list published by whoever built the switch it is going into.

Before ordering

Ask what multimode grade is in the run, because 550 m without a grade is half a specification. Check whether your switch reads vendor codes and what its own module list says. And if the module will live somewhere warm, note that the only temperature on this page is the one for the box it arrives in.

Availability

Priced from 17 € to 27 € across the German, French, Italian and Spanish Amazon stores the day this page was checked.

It is stocked on the British Amazon store as well, in that country’s own currency. The range above leaves those out: it counts euro stores and no others.

In the American Amazon catalogue with no live offer against it: the reference exists, nobody is filling it.

Every figure in this section is what Keepa held on the day this page was last updated. Stock and prices move without warning.

Prices quoted in this text were read on 10 September 2026. The live price is at the top of the page.

More SFP modules

  • DIGITUS bidirectional gigabit SFP module with a single LC optical port

    DIGITUS DN-81003, bidirectional single-mode SFP, Tx 1310 / Rx 1550 nm, 20 km stated

    A single-strand module that sends on one wavelength and listens on another, sold with the longest list of switch makers on this shelf and without the reversed counterpart that a link of this kind cannot work without.

    Module form factor
    SFP, called a mini GBIC in the title — the gigabit cage. The second bullet gives the operating mode as single-mode, LC simplex, bidirectional
    Module rate
    Up to 1.25 Gbit/s — stated in the title and in the fourth bullet, and repeated in the seventh as a maximum data rate of 1.25 Gbps. The eighth bullet names IEEE 802.3z as the gigabit standard it meets
    Optical or copper medium
    Optical — the sixth bullet calls it a plug and play fibre connection, and the second names a single-mode simplex LC port
    Fibre type
    Single-mode — stated in the title and in the second bullet. The grade is not published on the listing: no OS1 or OS2 designation appears, and the maker gives a pair of wavelengths and a distance instead
    Stated reach
    Up to 20 km — stated in the title and in the fourth bullet, which prints the rate and the distance in the same line
    Connector type
    LC simplex — a single position rather than a duplex pair, stated in the title and in the second bullet, because both directions travel on the same strand of glass
    Wavelength
    Tx 1310 nm and Rx 1550 nm — stated in the title and in the third bullet. A module with those two reversed has to sit at the far end, and the listing does not say whether one is supplied, sold beside it or left to the buyer to find
    Vendor coding stated
    Twenty-two makers are listed in the first bullet — Ubiquiti, Allied Telesis, Allnet, CISCO, D-Link, Edimax, Intellinet, KTI Networks, Level One, PLANET, Tenda, TP-Link, TRENDnet, ZyXEL, ZTE, Avaya, Mikrotik, ENTERASYS, FINISAR, FORCE 10, RIVERSTONE and Fortinet. No coding scheme and no part number is named against any of them
    Operating temperature range
    0 °C to +70 °C — stated in the fifth bullet as the operating temperature range
    Amazon reference
    B00609EB0K (same reference on 6 Amazon marketplaces)
    EAN
    4016032305682
    • One strand carries both directions, which halves the glass a link consumes
    • Twenty-two switch makers are named, the longest such list on this shelf
    • A bidirectional module is useless on its own, and nothing here says a counterpart comes with it

    Best for: A 20 km single-strand run between two buildings where fibre is scarce, bought together with the reversed counterpart it needs at the other end.

    ≈ 13 €
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  • 10Gtek 10GBASE-T copper SFP+ module with an RJ45 socket and a metal shell

    10Gtek 10GBASE-T copper SFP+, 30 m stated, Marvell AQR113C named, 2.5 W draw

    The copper module that tells you what it costs in watts and where it gets too warm, and then prints ten maker names it will not work with — the only listing on this shelf that spends a bullet on its own limits.

    Module form factor
    SFP+ — stated in the title, and the first bullet asks that the transceiver be used in a 10G SFP+ port rather than a gigabit one
    Module rate
    10 Gb/s — stated in the first bullet as the data rate, and carried by the 10GBase-T designation in the title
    Optical or copper medium
    Copper — stated in the title, which calls it a copper transceiver with an RJ45 socket
    Fibre type
    Not published on the listing, and a copper module has no fibre to qualify. The second bullet names the cable instead: CAT.6a or CAT7 RJ45 cable, quoted in the same line as the reach
    Stated reach
    Up to 30 m — stated in the title and in the second bullet, in both cases against the Cat 6a or Cat 7 cable named beside it
    Connector type
    RJ45 — stated in the title as the socket the module presents
    Wavelength
    Not published on the listing, and copper carries none. The fifth bullet names the Marvell AQR113C PHY controller in its place and calls it the latest of its kind
    Vendor coding stated
    Compatibility is claimed for Cisco, Meraki, Ubiquiti except the US-48-500W, Mikrotik, Netgear, Zyxel, QNAP NAS, Synology, D-Link, TP-Link, Supermicro and other open switches. The fourth bullet then names ten makers it is not compatible with: HP-ProCurve, HP-H3C, HP-Aruba, Intel, Arista, Mellanox, Dell Force10, Extreme, Brocade and Juniper
    Operating temperature range
    Not published on the listing as a range — the fifth bullet states instead that the module can become hot in use because the integrated circuit draws 2.5 W, and recommends using it where the ambient temperature stays below 50 °C
    Amazon reference
    B01M8O3MAL (same reference on 6 Amazon marketplaces)
    EAN
    0603149410633
    • The only listing here that publishes what the module draws, and says what that means in practice
    • Ten makers are named as incompatible, which is worth more than any list of the compatible ones
    • The thermal statement is an ambient recommendation, not the working range a datasheet would carry

    Best for: A ten-gigabit copper link in a cabinet with air actually moving through it, into a switch outside the ten makers this listing rules out.

    ≈ £31 / 36 €
    Check price on Amazon
  • Elfcam pair of bidirectional 10G SFP+ transceivers with single SC optical ports

    Elfcam matched pair of bidirectional 10G SFP+, SC simplex, OS2, 20 km stated

    The dearest listing on this shelf and the only one that ships a complete link: two bidirectional modules with their wavelengths already reversed, on SC connectors where everything else here uses LC or RJ45.

    Module form factor
    SFP+ — stated in the title, supplied as one pair of two modules rather than as a single transceiver
    Module rate
    10 Gbps, 2.5 Gbps and 1.25 Gbps — three rates stated in the second bullet, with 10 Gb, 2,5 Gb and 1,25 Gb also named in the title
    Optical or copper medium
    Optical — the first and second bullets name a single-mode simplex SC fibre port of 9/125 µm
    Fibre type
    Single-mode, 9/125 µm — stated in the title and again in the first, second and fourth bullets. The grade is given as OS2 in the title and in the first and fourth bullets, which makes this one of only two optical modules on this shelf to name a grade at all
    Stated reach
    Up to 20 km — given in the first bullet as 20 KM and in the fourth as a transmission distance of up to 20 km with a single-mode simplex 9/125 µm OS2 SC cable
    Connector type
    SC simplex — stated in the title and in the first bullet. It is the only SC module on this shelf; the other six take LC or RJ45
    Wavelength
    TX 1270 nm with RX 1330 nm on one module and TX 1330 nm with RX 1270 nm on the other — stated in the first and second bullets. That reversal is what makes the pair a pair, and it is the reason the two modules are not interchangeable with each other
    Vendor coding stated
    Coded for Cisco SFP-10G-BXD-I and SFP-10G-BXU-I — the downstream and upstream halves named separately — with Ubiquiti Networks UF-SM-10G-S, Huawei, D-Link, Ruijie and open switches added in the third bullet, which prints Huawei twice
    Operating temperature range
    Not published on the listing — no range appears in any bullet. The fifth offers a warranty and a repair service centre in Paris in its place, and the sentence that should give the warranty length has no number in it: it reads as a warranty period of years, with the figure missing
    Amazon reference
    B0DBLFC335 (same reference on 6 Amazon marketplaces)
    EAN
    3701528726041
    • Two modules with the wavelengths already reversed, so a single-strand link is complete in one order
    • Names both halves of the Cisco bidirectional pair, downstream and upstream, by part number
    • The warranty sentence has a blank where its number should be

    Best for: A 20 km single-strand run on SC-terminated single-mode fibre, bought once with both ends of the link in the same box.

    ≈ $66 / £60 / 60 €
    Check price on Amazon

Others worth having spare

  • Q-Batteries assembled replacement battery module for an APC Back-UPS with F2 terminals

    Q-Batteries Replacement module for APC RBC48, 12 V 7.2 Ah stated, F2 terminals, 151 × 130 × 100 mm

    A ready-made module quoted against an APC cartridge code, whose case is roughly twice the width of the single cells on this shelf while its electrical figures stay identical to theirs.

    Cell reference
    Not published on the listing — no code describing an individual cell appears, and the fifth bullet gives the technical data for the module as a whole
    Cartridge reference
    RBC48 — stated in the title and in the first bullet, which names it as a UPS replacement battery for APC. It is one of two cartridge codes published on this shelf, and it is the route by which a UPS maker’s own paperwork can be matched
    Voltage rating
    12 V — stated in the fifth bullet, in the technical data line
    Amp-hour rating
    7.2 Ah — stated in the fifth bullet, beside the voltage. No watt-hour figure is published, and this page does not produce one
    Terminal type
    F2 — stated in the fifth bullet as the connection type. It is one of two listings on this shelf to name a terminal at all, and the designation is given without a description of what it is
    Terminal width
    Not published on the listing — F2 is a tab designation and no millimetre figure is printed against it. One cell in this hub publishes a width in millimetres, and this is not it
    Case dimensions
    151 mm × 130 mm × 100 mm — stated in the fifth bullet. Three other cells on this shelf publish 151 × 65 × 94 mm at the same stated voltage and the same stated capacity, so this case is roughly twice as wide as theirs while the electrical figures are identical. The listing prints both facts and does not reconcile them
    Cells per pack
    Not published on the listing — the title calls the product a ready-made battery module for replacement and no bullet says how many cells are inside it or how they are wired to each other
    Assembled or loose supply
    Assembled — stated in the title as a ready-made module for exchange. It is the only listing on this shelf that says outright what state the product arrives in
    Stated design life
    Not published on the listing — no period and no condition appears. The fourth bullet describes a maintenance-free sealed AGM battery, which is a construction rather than a life
    Amazon reference
    B005SJNH1M (same reference on 4 Amazon marketplaces)
    EAN
    4250889626181
    • Publishes an APC cartridge code, which four listings on this shelf do not
    • States that it arrives assembled and ready to exchange, which no other listing here does
    • A case roughly twice as wide as the single cells here, with the same 12 V and 7.2 Ah beside it and no explanation

    Best for: One of the three APC machines named on the page, where a ready-assembled module is worth more than a loose cell and the tray has been measured against the wider case.

    ≈ 64 €
    Check price on Amazon
  • Voltrana replacement UPS battery of 12 V and 7.2 Ah in a black sealed case

    voltrana Replacement cell for Eaton Ellipse PRO 650 DIN, 68760SP named, 1 × 12 V 7.2 Ah

    Everything published about this cell is in its title: a machine name, a code whose role is unstated, and two electrical figures. The feature list underneath contains a single word.

    Cell reference
    Not published on the listing — no code describing the cell itself appears. The record carries no manufacturer reference either, so this page publishes none
    Cartridge reference
    68760SP is printed in the title, directly after the machine name Eaton Ellipse PRO 650 DIN. The listing does not say whether that code identifies the UPS, the battery cartridge Eaton sells for it, or the seller’s own line, and this page does not assign it a role it has not been given
    Voltage rating
    12 V — stated twice in the title, once on its own and once inside the phrase 1 × 12 V 7.2 Ah
    Amp-hour rating
    7.2 Ah — stated in the title. No watt-hour figure is published and none is calculated here
    Terminal type
    Not published on the listing — no Faston tab, no bolted terminal and no designation of any kind appears. On a cell sold as a fitting part, this is the line that decides whether the connector from the machine goes on it
    Terminal width
    Not published on the listing — no millimetre figure is given, which follows from the terminal type being absent
    Case dimensions
    Not published on the listing — no length, width or height appears anywhere. Three cells on this shelf publish all three, and the tray in a UPS is a moulding that does not stretch
    Cells per pack
    One — stated in the title as 1 × 12 V 7.2 Ah, which names the count and the rating of the single cell supplied
    Assembled or loose supply
    Not published on the listing — nothing describes whether the cell arrives with an interconnect fitted or with its tabs insulated. The single cell count in the title is as close as the page comes to the question
    Stated design life
    Not published on the listing — no period and no condition is given
    Amazon reference
    B0H4RF7G6N (same reference on 1 Amazon marketplace)
    EAN
    4262498488371
    • States the count and the rating together, as 1 × 12 V 7.2 Ah, which removes one common ambiguity
    • Names the target machine in the title rather than leaving compatibility to a search
    • The feature list is one word long and carries no specification at all

    Best for: Somebody who already has the Eaton machine named in the title open in front of them and can verify the fit physically, rather than from this page.

    ≈ 23 €
    Check price on Amazon
  • Amazon Basics black 128 GB flash drive with a telescopic sliding body

    Amazon Basics 128 GB, USB 3.1 stated, telescopic body, 130 read and 30 write stated, 115 GB usable published

    The only drive in this hub whose maker prints the usable figure alongside the label figure — and the only one that prints its headline number in two different units within a single page.

    Capacity
    128 GB — stated in the title, with the fifth bullet adding that the available storage is more than 115 GB and naming differing measurement standards as the reason the two figures differ. Both numbers are the maker’s own and both are reported here as printed; neither is calculated by this page
    USB generation
    USB 3.1 — stated in the title. The first bullet is more specific: a USB 3.1 Gen 1 or USB 3.0 port is required on the host machine to reach the stated read and write speeds, with backward compatibility to USB 2.0 hosts at a lower rate
    Stated link rate
    Not published on the listing — no class rate in gigabits per second appears. The first bullet claims the drive is 15 times faster than USB 2.0 drives, which is a comparison rather than a rate
    Stated read figure
    130, printed in two units on the same page. The title gives up to 130 Mbit/s; the first bullet gives up to 130 MB/s. The two units differ by a factor of eight and the listing never reconciles them, so both are reported here exactly as written and neither is converted
    Stated write figure
    Up to 30 MB/s — stated in the first bullet, in the same sentence as the reading figure. The bullet attributes both to internal tests under controlled conditions and adds that actual speeds vary with the device, the transfer size, the file types and other factors
    Connector type
    Not published on the listing as a plug shape — the first bullet names the host ports required, USB 3.1 Gen 1 or USB 3.0, which is a class and not a connector, and no Type-A or Type-C designation appears in the title or the bullets
    Body design
    A telescopic design — stated in the third bullet, which names the retracting body as what protects the drive from damage when it is not in use. There is no separate cap to lose. No material, no dimensions and no weight are given
    Keyring provision
    Not published on the listing — no loop or eyelet is named in any of the five bullets
    Stated ingress rating
    Not published on the listing — no IP code and no water or dust figure appears
    Warranty length
    Not published on the listing — no period is stated. The fifth bullet closes on a note about checking the storage requirements of devices such as games consoles before use
    Amazon reference
    B0B6148YKN (same reference on 6 Amazon marketplaces)
    EAN
    0840095889711
    • Publishes the available capacity itself, at more than 115 GB, which no other listing on this shelf does
    • States the host port needed to reach its own figures, rather than printing a bare number
    • The same headline number appears as Mbit/s in the title and MB/s in the first bullet

    Best for: A first drive for somebody who has been caught out by a capacity that displayed smaller than the box promised, since this is the listing that explains the difference on the page rather than after the sale.

    ≈ 18 €
    Check price on Amazon

All SFP modules