Skip to content

The only module here that prints transmit power and receive sensitivity

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.

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

Specifications

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

On the listing

A gigabit SFP module in the 1000BASE-LX/LH class, single-mode, with a duplex LC connector, a wavelength of 1310 nm and a transmission distance given as up to 10 km; a data rate of 1000 Mbit/s; a working temperature of 0 to 70 °C; a transmit power between -9 and -3 dBm and a receive sensitivity below -22 dBm; DDM support, described as real-time monitoring of the state of the transmitted and received signals so that problems can be found; a metal housing credited with surviving repeated insertion; and compatibility stated for HP J4859A, J4859C and J4859B together with other open switches, with a request to confirm the switch model before ordering.

1310 nanometres, single-mode, and the grade nobody writes

The wavelength is printed, the distance is printed, and the glass they assume is not. Single-mode appears in the title and in the second bullet. What never appears is the grade — OS1 or OS2 — that says which single-mode fibre the 10 km figure was worked out over.

Three of the five optical modules on this shelf have the same hole in the same place. It is not a small one: a distance claim is a claim about a length of glass, and the glass has a specification of its own that the module cannot supply.

What this listing does instead is better than most, and it is in the line below.

Transmit power, receive sensitivity, and the gap between them

Two numbers appear here and nowhere else on this shelf. Light leaves the module at between -9 and -3 dBm. Light has to arrive at the far end above -22 dBm to be read.

That pair is the only thing on any of these seven pages that lets a buyer reason about a specific run rather than accept a round number. Every splice, every connector, every kilometre of glass takes a share of the difference, and when the share runs out the link stops. A module that publishes both figures is telling you what it can afford to lose. A module that publishes only the kilometres is telling you what it hopes.

Coded for three HP part numbers

J4859A, J4859C, J4859B. Three part numbers, written out, which is more precise than any of the brand lists elsewhere on this shelf.

It is still a declaration by the seller. The fifth bullet is honest about that in its own way: it says the seller keeps many compatible options and asks the buyer to confirm the switch model before purchase. Nothing in a request like that is a certification, and the module list published by the switch maker remains the document that decides the question.

Before ordering

Read your switch maker’s own module list and buy on the coding it names, not on the compatibility line here. Then count modules: this listing supplies one, and a 10 km span needs a transceiver at both ends. Last, ask what fibre is in the ground — the grade is the one figure the page leaves out, and the 10 km depends on it.

Availability

Priced at roughly 10 € on the German and French 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.

The Italian and Spanish Amazon price runs past 1.6× the cheapest store. A gap that size normally marks a reshipper and not a seller in the country, so those listings stay out of the range above.

The American Amazon store returned nothing at all, so the buy button there opens a search in that country rather than a page that would not load.

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

  • 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
  • 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
  • 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 €
    Check price on Amazon

Others worth having spare

  • 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
  • Fiamm sealed lead-acid replacement battery of 12 V for an APC Back-UPS

    Fiamm Replacement cell for APC Back-UPS ES 700, 12 V, 7200 mAh / 86.4 Wh, 151 × 65 × 94 mm

    One of two cells on this shelf whose maker publishes the watt-hour figure itself, and the only one that gives its capacity in milliamp-hours rather than amp-hours.

    Cell reference
    Not published on the listing — no code describing the cell type, its case format or its rating appears in the bullets. The record carries the maker’s order reference, which is what the model field above holds
    Cartridge reference
    Not published on the listing — no APC cartridge code such as the RBC family appears. The machine is named instead, as the APC Back-UPS ES 700, in the title
    Voltage rating
    12 V — stated in the title and in the third bullet
    Amp-hour rating
    7200 mAh — stated in the third bullet, in milliamp-hours rather than in amp-hours, with 86.4 Wh given immediately beside it. Both figures are the maker’s and both are reported here in the units the maker printed them in. The watt-hour figure is published rather than derived, which is why it appears at all
    Terminal type
    Not published on the listing — no Faston tab, no bolted post and no designation is named in any of the five bullets
    Terminal width
    Not published on the listing — no millimetre figure appears for the tabs. One cell on this shelf publishes a width and the other five do not
    Case dimensions
    151 mm × 65 mm × 94 mm — stated in the fourth bullet. Three cells in this hub carry exactly these three numbers, which is the standard footprint for a sealed cell of this rating
    Cells per pack
    Not published on the listing — no count and no series or parallel arrangement appears. The bullets describe a single battery without ever saying so in a number
    Assembled or loose supply
    Not published on the listing — nothing says whether an interconnect is fitted or the tabs arrive insulated. The first bullet calls it an original battery and the second calls it high-grade new stock
    Stated design life
    Not published on the listing — no period and no conditions are given. The fifth bullet claims cells of the highest quality, which is a claim rather than a specification
    Amazon reference
    B00F4A6FAU (same reference on 6 Amazon marketplaces)
    EAN
    4051363470807
    • Publishes a watt-hour figure itself, which four listings on this shelf never do
    • All three case dimensions, on the standard footprint for this rating
    • No terminal type and no tab width, which are the two figures that decide whether it connects

    Best for: An APC Back-UPS whose old cell measures 151 by 65 by 94 and whose tabs have already been identified by eye, since this page will not identify them for you.

    ≈ 25 €
    Check price on Amazon
  • 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

All SFP modules