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Small rectangular SFP transceiver module with metallic finish and LC port

HP

HP ProCurve J4858C X121 1000BASE-SX SFP Transceiver

SKU CH-2JVD-96N6H

A small form-factor pluggable Gigabit SX transceiver providing full-duplex connectivity up to 550 m on multimode fiber via an LC port

  • Product typeTransceiver
  • HighlightsJ4858C HP X121 1G SFP LC SX Transceiver 1 LC 1000Base-SX por
  • Product dimensions(L × W × H) : 0.54 × 2.24 × 0.49 in
  • Product weight0.04 lb (0.02 kg)
  • Gigabit connectivity up to 550 m on multimode fibre
  • Hot-swappable SFP form factor for easy installation
  • LC duplex connector ensures secure fibre links
  • Compact module measuring 0.54 x 2.24 x 0.49 in
  • Lightweight at 0.04 lb for dense deployments

HP X121 1G SFP LC SX Transceiver

The HP ProCurve J4858C is a small form-factor pluggable transceiver delivering full-duplex Gigabit Ethernet over multimode fibre. It serves network administrators extending links between switches or routers in campus and data-centre environments.

Thermals noise and power draw

The module operates within standard SFP power envelopes without active cooling, so it adds negligible heat or acoustic load to a populated chassis. Its low-profile design maintains airflow density in high-port-count line cards.

Duplex LC connector and 550 m reach

A single LC duplex port connects directly to OM1, OM2 or OM3 multimode patch cords for runs up to 550 metres. Hot-plug capability allows insertion or removal without powering down the host equipment.

How it compares

Measured against everything we stock in SFP & SFP+ Transceiver Modules, at today’s prices. Recalculated every night.

Price $20.99
Cheaper than about 93% of the 1,471 comparable items (median $138.99).

Specifications

Product
Brand nameHP
Model nameJ4858C
Product typeTransceiver
Size & build
Product dimensions(L × W × H) : 0.54 × 2.24 × 0.49 in
Product weight0.04 lb (0.02 kg)

Questions about this item

How do I install the J4858C SFP transceiver and what step is often missed?

Slide the module into an SFP port until the latch clicks, then insert the LC duplex cable fully so both ferrules seat; the step people skip is removing the dust caps from both the transceiver and the fiber ends before connecting.

What maintenance or replacement will the J4858C need over time?

The transceiver itself has no moving parts or replaceable components; periodic maintenance is limited to cleaning the LC connector end-faces with a lint-free wipe and isopropyl alcohol if signal loss appears.

What distance limit appears first on a 1000BASE-SX link using this module?

The 550 m reach on multimode fiber is the first limit; beyond that distance the optical budget cannot guarantee a reliable gigabit link.

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