Network Transceiver Modules

Optical and copper transceivers for switches, routers and server NICs: SFP at 1G, SFP+ at 10G, SFP28 at 25G and QSFP+ and QSFP28 at 40G and 100G, in short-reach, long-reach, bi-directional and RJ45 copper forms.

Buying guide ↓

The switch has to accept the module, and many will not accept just any

Every transceiver carries an identity in its EEPROM, and switch firmware reads it. A switch may refuse to bring up a port with an unbranded module, log it as unsupported, or accept it only after a command is set. This is the most common reason a correctly specified module does not work. Buy either the switch vendor's own part or a coded compatible module programmed for that platform — which is why third-party part numbers quote the original code they replace. Coding is platform-specific: a module coded for one vendor will not necessarily work in another's switch.

Wavelength and fibre type have to match at both ends

SR optics run at 850 nm over multi-mode fibre and cover a few hundred metres. LR optics run at 1310 nm over single-mode and cover kilometres. Module, fibre and far-end module must all agree — an SR module will not light a single-mode link, and SR paired with LR will not work whatever the patch lead. Decide the fibre and the optics together.

Form factor sets the ceiling, not the floor

A slot runs at its own rate or below: a 1G SFP generally works in an SFP+ port, while a 10G module will not run in a 1G slot. QSFP carries four lanes, which is what lets a 40G port break out into four 10G links. Check what the switch supports per port rather than assuming the speed on the chassis.

Bi-directional and copper modules

BiDi modules send and receive on different wavelengths over one strand, halving the fibre needed. They are bought as matched pairs — 1270 nm at one end, 1330 nm at the other — and two of the same end will not link. Copper SFP modules present an RJ45 port for short runs; 10G copper draws noticeably more power and runs hot, so check the switch's budget before filling a chassis with them.

Brands

Cisco, HPE, Ubiquiti and MikroTik, alongside coded-compatible optics from Lanview and AddOn Networks, and modules for Dell, Lenovo, NETGEAR, TP-Link, Zyxel and Planet.

Trade pricing and business accounts are available for UK organisations, and bulk orders are welcome — request a quote.