Skip to content

Sold as the matched pair a bidirectional link cannot work without

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.

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

Specifications

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

On the listing

A pair of bidirectional ten-gigabit SFP+ transceivers, one transmitting at 1270 nm and receiving at 1330 nm and the other the reverse, with SC single-mode simplex ports of 9/125 µm on OS2 fibre, DDM, and a transmission distance of up to 20 km; rates given as 10 Gbps, 2.5 Gbps and 1.25 Gbps; a fibre connection type of SC/APC and SC/UPC; compatibility for Cisco SFP-10G-BXD-I and SFP-10G-BXU-I, Ubiquiti Networks UF-SM-10G-S, Huawei, D-Link, Ruijie and open switches; and a warranty returnable to a repair service centre in Paris, in a sentence whose duration figure is missing.

One strand, two wavelengths, two modules

This is the only listing in this hub that sells a link rather than an end of one.

A bidirectional transceiver is deliberately asymmetric: it speaks on one wavelength and listens on another, so that the module at the far end can do the opposite and both can share the same strand of glass. Point two identical ones at each other and nothing happens at all.

The other bidirectional module on this shelf is sold on its own, with no word about where its mirror image comes from. This one arrives as a pair, wavelengths already reversed, which turns a two-part problem into a single order. Over 20 km, on a duct with one spare strand in it, that is the entire proposition.

SC where the rest of this shelf uses LC

Six modules here take LC or RJ45. This one takes SC — the larger square connector, common on provider equipment.

That is a fact to check against the fibre before it is a preference. A run already terminated in LC does not accept an SC module without new connectors or an adapter, and an adapter is another pair of faces for light to cross. The listing is clear about what it wants: SC, simplex, single-mode, 9/125 µm, OS2.

What it is not clear about is the polish. The second bullet names SC/APC and SC/UPC together, which are two different faces that cannot be mated to one another, and never says which arrives.

The warranty sentence with no number in it

The fifth bullet promises that a technical fault occurring within the warranty period of years may be returned to a repair centre in Paris.

The figure is simply absent — a sentence built to carry a number, delivered without one. Nothing is being hidden; something has been lost between drafting and printing. But a warranty length is a commitment, and a commitment with the duration missing is not one this page can report as a fact. The service address is real and specific; the term it applies to is not on the page.

Before ordering

Confirm the connector at both ends of the existing fibre, because SC is the outlier on this shelf and an adapter costs light. Ask which polish is fitted, since the page names two that cannot meet. Then ask what the warranty period actually is — the sentence is there, the number is not.

Availability

Priced from 60 € to 65 € across the German, French, Italian and Spanish Amazon stores the day this page was checked.

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

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

  • GIQITCK 10GBASE-T copper SFP+ transceiver with an RJ45 socket

    GIQITCK 10GBASE-T copper SFP+ to RJ45, 30 m stated, Realtek controller named

    The cheaper of the two copper ten-gigabit modules here, sold with an unusually specific compatibility bullet that excludes two Cisco series by name and a cable requirement stated twice in two incompatible ways.

    Module form factor
    SFP+, called a mini-GBIC in the title — the ten-gigabit cage. The third bullet says it belongs in a 10Gb SFP+ port and names fibre switches, routers, network cards and servers as its hosts
    Module rate
    10 Gbps — stated in the title as 10GBASE-T and in the second bullet, which says the module supports a 10 Gbps rate
    Optical or copper medium
    Copper — stated in the title and in the second bullet, which calls it a 10G copper module with a copper RJ-45 plug
    Fibre type
    Not published on the listing, and a copper module has no fibre to qualify. What the second bullet names in its place is the cable, and it names it twice: Cat 6A, Cat 7 or Cat 8 in one sentence, then Cat 5e or better in the next. Both statements are printed, neither is withdrawn
    Stated reach
    Up to 30 m — stated in the title. No shorter distance is quoted against a lesser cable, which is what would normally reconcile the two cable statements
    Connector type
    RJ45 — stated in the title and in the second bullet as a copper RJ-45 plug
    Wavelength
    Not published on the listing, and copper has none. The nearest the page comes is the first bullet, which names a Realtek controller as the newest chip and credits it with a performance improvement
    Vendor coding stated
    Coded for Cisco SFP-10G-T-S, with the Cisco Nexus and Cisco Meraki series excluded by name in the same bullet; also named are Ubiquiti UF-RJ45-10G, Ubiquiti Networks, Netgear AXM765, DEM-440XT, Mikrotik, Supermicro and other open switches
    Operating temperature range
    Not published on the listing — no working range appears in any bullet. The fifth says instead that every module was checked one after another on various switches before shipping, and the sixth offers a thirty-day return, a two-year warranty and lifetime technical support
    Amazon reference
    B0DLG7WG35 (same reference on 6 Amazon marketplaces)
    EAN
    0717325593611
    • Names two switch series it will not work in, which no other listing on this shelf does
    • Quotes Cisco, Ubiquiti and Netgear part numbers rather than brand names alone
    • Two different cable requirements sit one sentence apart and neither is withdrawn

    Best for: A ten-gigabit copper run of up to 30 m into a switch on the named list, and specifically not into a Nexus or a Meraki.

    ≈ $25 / 28 €
    Check price on Amazon
  • QSFPTEK gigabit SFP transceiver with a duplex LC optical port and a metal body

    QSFPTEK 1000BASE-LX/LH single-mode SFP, 1310 nm, 10 km stated, coded for three HP part numbers

    The cheapest module on this shelf and the only one that publishes how much light leaves it and how little can arrive at the far end, sold coded for three HP part numbers with a request to confirm the switch before ordering.

    Module form factor
    SFP, called a mini-GBIC in the title — the gigabit cage rather than the larger SFP+ one. The fifth bullet lists the other form factors the seller stocks, from GBIC and SFP through SFP BIDI, DWDM and CWDM to 10G XFP, 10G SFP+ and 40G and 100G transceivers
    Module rate
    1000 Mbit/s — stated in the second bullet, and carried by the 1000BASE-LX/LH designation printed in the title
    Optical or copper medium
    Optical — the second bullet names a single-mode duplex LC connector, and the first places the module in fibre switches, routers, network cards and servers with gigabit SFP ports
    Fibre type
    Single-mode — stated in the title and again in the second bullet. The grade is not published on the listing: no OS1 or OS2 designation appears anywhere, and the maker gives a wavelength and a distance in its place
    Stated reach
    Up to 10 km — stated in the title and repeated in the second bullet as a transmission distance
    Connector type
    Duplex LC — stated in the second bullet, so the link uses two strands, one in each direction
    Wavelength
    1310 nm — stated in the title and in the second bullet, with a transmit power between -9 and -3 dBm and a receive sensitivity below -22 dBm quoted alongside it
    Vendor coding stated
    Coded for HP J4859A, J4859C and J4859B — stated in the title and in the first bullet, which adds other open switches without naming them. The fifth bullet asks the buyer to confirm the switch model before ordering, which is a seller declaring a coding rather than a switch maker certifying one
    Operating temperature range
    0 to 70 °C — stated in the second bullet as the working temperature, alongside the two optical power figures
    Amazon reference
    B07QR9HGMZ (same reference on 5 Amazon marketplaces)
    EAN
    0767912359670
    • Publishes transmit power and receive sensitivity, which no other module on this shelf prints
    • Names three HP part numbers outright instead of claiming compatibility in general terms
    • The fibre grade is never written, so OS1 and OS2 are left for the buyer to settle

    Best for: A gigabit link between two buildings on single-mode fibre, into a switch whose published module list names one of the three HP part numbers quoted.

    ≈ £11 / 10 €
    Check price on Amazon
  • QINIYEK 10GBASE-LR single-mode SFP+ transceiver with a duplex LC optical port

    QINIYEK 10GBASE-LR single-mode SFP+, 1310 nm, 10 km stated, four to a pack

    The only multi-module pack on this shelf, four ten-gigabit single-mode transceivers in one order, sold with the lowest published power draw here and a first bullet that manages to describe the same fibre two incompatible ways.

    Module form factor
    SFP+ — stated in the title, sold four to a pack, which no other listing on this shelf does
    Module rate
    10 G — stated in the first bullet as the data rate, and carried by the 10GBase-LR designation in the title
    Optical or copper medium
    Optical — the first bullet names a duplex LC connector and single-mode fibre, and the second lists the switch families it is coded against
    Fibre type
    Single-mode — SMF is stated in the title and in the first bullet. The same bullet then gives the 10 km reach as obtained with a multimode fibre cable, OS2. The two halves of that sentence do not agree; the rest of the listing — SMF, 1310 nm and the 10GBASE-LR designation — reads single-mode throughout, and the page never reconciles them
    Stated reach
    Up to 10 km — stated in the title and in the first bullet, in the same line as the fibre description that contradicts itself
    Connector type
    Duplex LC — stated in the first bullet as the interface, so each link uses two strands
    Wavelength
    1310 nm — stated in the title and in the first bullet
    Vendor coding stated
    Coded for Cisco SFP-10G-LR, Ubiquiti UF-SM-10G and Meraki MA-SFP-10GB-LR, with Mikrotik, D-Link, Supermicro, Netgear and other open switches named in the second bullet without part numbers
    Operating temperature range
    Not published on the listing — no range appears in any bullet. The third publishes a power consumption of less than one watt and low EMI in its place, and adds that every module is checked individually before packing
    Amazon reference
    B09X9RZFC7 (same reference on 6 Amazon marketplaces)
    EAN
    0771077536357
    • Four modules in one pack, which is two complete links rather than one end of one
    • Under one watt, the lowest power figure published on this shelf
    • The first bullet calls the fibre multimode and SMF in a single sentence

    Best for: Two ten-gigabit single-mode links being built at once, or one link with spares, into switches whose module lists name the Cisco, Ubiquiti or Meraki part numbers quoted.

    ≈ $36 / £45 / 35 €
    Check price on Amazon

Others worth having spare

  • APC APCRBC123 sealed replacement battery cartridge in its APC packaging

    APC APCRBC123 replacement battery cartridge, sealed lead, tool-free change, 1-year warranty

    The most expensive product on this shelf publishes no voltage, no capacity, no terminal and no case size. Its entire specification is a part number, and for a machine maker’s own cartridge that is very nearly enough.

    Cell reference
    Not published on the listing — no code for the cell or cells inside the cartridge appears, and no rating is given for them
    Cartridge reference
    APCRBC123 — stated in the title, and it is the whole identity of the product. It is the maker’s own cartridge code, which is the reference APC publishes against each of its UPS models, and the fourth bullet says original RBC cartridges are checked and certified for compatibility to restore the machine’s original performance specifications
    Voltage rating
    Not published on the listing — no volt figure appears in the title or in any of the five bullets. It is the only listing on this shelf that publishes no voltage
    Amp-hour rating
    Not published on the listing — no amp-hour and no watt-hour figure appears anywhere. Five of the six listings in this hub publish a capacity, and this is the one that does not
    Terminal type
    Not published on the listing — no tab, post or designation is named. The third bullet says the battery can be changed without tools, which describes the operation rather than the connection
    Terminal width
    Not published on the listing — no millimetre figure appears, which follows from the terminal type being absent
    Case dimensions
    Not published on the listing — no length, width or height is given anywhere on the page
    Cells per pack
    Not published on the listing — the product is described as a cartridge and the number of cells inside it is never stated
    Assembled or loose supply
    Assembled, as a cartridge — the product name says so and the fifth bullet lists the contents as the battery, a recycling manual and installation instructions. The third bullet adds that the change is possible without tools
    Stated design life
    Not published on the listing — no design life and no conditions appear. What the second bullet publishes instead is a one-year repair or replacement warranty, which is a commercial term and not a statement about how long the cells are specified to last
    Amazon reference
    DE B004FV7XJG · US B00I52YJWA · GB B00I52YJWA · FR B00I52YJWA · IT B00I52YJWA · ES B00I52YJWA
    EAN
    0731304284369
    • The maker’s own cartridge code, which is the reference APC’s documentation is written around
    • Arrives as a cartridge with installation instructions and a recycling manual in the box
    • No voltage and no capacity anywhere, on the most expensive product here

    Best for: An APC machine whose documentation names APCRBC123, where matching the maker’s own code matters more than reading a specification.

    ≈ $109 / 90 €
    Check price on Amazon
  • EMOS B9674 sealed lead-acid AGM battery of 12 V and 7.2 Ah with Faston terminals

    EMOS B9674 AGM cell, 12 V, 7.2 Ah, Faston 6.3 mm tabs, 151 × 65 × 94 mm

    The one cell on this shelf whose title carries every figure a fitting decision needs: voltage, amp-hours, tab type, tab width in millimetres and all three case dimensions.

    Cell reference
    B9674 — stated in the first bullet in brackets, as EMOS B9674. It is the maker’s own code for the cell rather than a code belonging to any UPS
    Cartridge reference
    Not published on the listing — no UPS maker’s cartridge code appears, and no machine is named that the cell is sold as a replacement for. The title names the applications instead: UPS units, alarm systems
    Voltage rating
    12 V — stated in the title and in the second bullet. It is one of two figures on this page that must match what comes out of the machine, and the amp-hour figure is the other
    Amp-hour rating
    7.2 Ah — stated in the title and in the second bullet. The listing publishes no watt-hour product, and this page does not calculate one from the two figures printed here
    Terminal type
    Faston tabs — stated in the title. It is one of two listings on this shelf that names a terminal type at all
    Terminal width
    6.3 mm — stated in the title as a Faston 6.3 mm connection. No other listing on this shelf publishes a tab width in millimetres, and it is the figure that decides whether a cell of the right rating actually connects
    Case dimensions
    151 × 65 × 94 mm — stated in the title and again in the second bullet, which calls the format compact and suitable for a wide range of applications
    Cells per pack
    One — the title, the bullets and the contents all describe a single 12 V block. No pack count and no series or parallel arrangement is published
    Assembled or loose supply
    Loose — a single cell with no interconnect and no insulated tabs described. The first bullet adds that the AGM construction is leak-proof and that the cell can be used in any orientation
    Stated design life
    Up to 5 years — stated in the fourth bullet, alongside integrated safety systems and an instruction to charge the cell fully before first use. A design life is a manufacturer specification under stated conditions and is neither a warranty nor a prediction about one battery
    Amazon reference
    B01N2HLTS0 (same reference on 5 Amazon marketplaces)
    EAN
    8592920004449
    • Publishes the tab width in millimetres, which no other cell here does
    • All three case dimensions in the title, so the tray can be measured before ordering
    • No cartridge reference, so it cannot be matched to a UPS by the machine’s own part code

    Best for: A machine whose old cell has been taken out and measured, where voltage, amp-hours, case size and tab width can all be compared against a listing that publishes every one of them.

    ≈ 16 €
    Check price on Amazon
  • akku-net black sealed lead-acid replacement battery of 12 V for an APC Smart-UPS

    akku-net Replacement cell for APC Smart-UPS 750, 12 V, 7.2 Ah / 86 Wh, 151 × 65 × 94 mm, 4920 g

    A cell whose specification bullet reads like a data sheet — voltage, capacity, watt-hours, cell type, three dimensions, weight and colour — and which still leaves the terminals entirely undescribed.

    Cell reference
    Not published on the listing — no cell code appears in the bullets. The reference carried in the record is the same string as the product barcode, and this page reports it as the record holds it rather than substituting anything else
    Cartridge reference
    Not published on the listing — no APC cartridge code appears anywhere. The title names the machine instead, as the APC Smart-UPS 750
    Voltage rating
    12 V — stated in the title and first in the specification bullet, which opens on voltage
    Amp-hour rating
    7.2 Ah — stated in the specification bullet, with 86 Wh printed immediately beside it. Both are the maker’s figures and both are reported here as printed; the watt-hour number is published rather than derived by this page
    Terminal type
    Not published on the listing — the specification bullet runs through voltage, capacity, cell quality, cell type, dimensions, weight, colour and compatibility, and never reaches the terminals
    Terminal width
    Not published on the listing — no millimetre figure for the tabs appears, which follows from the terminal type being absent
    Case dimensions
    151 mm × 65 mm × 94 mm — stated in the specification bullet. It is the same footprint two other cells on this shelf publish at the same rating
    Cells per pack
    Not published on the listing — no count appears, and no series or parallel arrangement is described. The bullets speak throughout of a single battery
    Assembled or loose supply
    Not published on the listing — nothing says whether an interconnect is fitted or the tabs arrive insulated. The fourth bullet describes the replacement as something the owner carries out, without describing what arrives
    Stated design life
    Not published on the listing — no period and no condition is given. The second bullet calls the cell maintenance-free and names power supply, standby installations and security and alarm equipment as its intended uses
    Amazon reference
    B00BUT4RPE (same reference on 5 Amazon marketplaces)
    EAN
    4051363442835
    • Publishes a weight, at 4920 g, which no other cell on this shelf does
    • Puts voltage, capacity, watt-hours, cell type, dimensions, weight and colour in one readable line
    • No terminal type and no tab width anywhere in a bullet that covers everything else

    Best for: An APC Smart-UPS where the tray depth and the shelf loading matter as much as the electrical rating, since this is the one listing that says what the cell weighs.

    ≈ 48 €
    Check price on Amazon

All SFP modules