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Small metallic SFP transceiver with RJ-45 port and side label

AddOn

AddOn FCLF8521P2BTL-AO 1000Base-TX SFP Transceiver Copper 100m RJ-45 server accessory

SKU CH-XDTN-GACZ2 MPN FCLF8521P2BTL-AO

A hot-swappable SFP transceiver that adds a 1000Base-T copper link over 100 m using an RJ-45 connector

  • Product typeSFP (mini-GBIC)
  • Details1 × 1000Base-T LAN
  • Key features1 x RJ-45 1000Base-T Network LAN
  • Compatible with Finisar FCLF8521P2BTL for seamless integration
  • Hot-swappable SFP enables quick upgrades without downtime
  • 1000Base-TX copper link covers 100m over RJ-45
  • MSA compliant design ensures multi-vendor interoperability
  • TAA compliant for government procurement requirements

What this transceiver does

This AddOn SFP transceiver provides a copper 1000Base-T link over standard RJ-45 cabling up to 100 metres. It is built for network engineers and server administrators who need to connect Gigabit Ethernet ports using existing twisted-pair infrastructure. The module follows the mini-GBIC form factor and is factory programmed for OEM compatibility.

Sustained operation

The unit is designed for continuous operation inside a Gigabit Ethernet slot without performance degradation over time. As a hot-swappable I/O device it initialises identically to the original OEM transceiver and maintains link stability when deployed alongside other OEM or third-party modules. Compliance with multi-source agreement standards ensures consistent interoperability across supported platforms.

Installation notes

Insertion is straightforward: the transceiver slides into any compliant SFP cage and locks with the standard bail latch. Because it is hot-swappable, no system reboot is required. The most common issue is seating the module fully so the latch clicks; an incomplete insertion will leave the link down. Verify that the switch port is configured for 1000Base-T copper before troubleshooting.

How it compares

Measured against everything we stock in Drive Cages & Server Add-Ons, at today’s prices. Recalculated every night.

Price $37.99
Cheaper than about 71% of the 1,119 comparable items (median $74.99).

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Specifications

Product
Brand nameAddOn - Network Upgrades
Model nameFCLF8521P2BTL-AO
Product typeSFP (mini-GBIC)
Size & build
Shipping weight0.18 kg
Package size121 × 70 × 30 mm

Questions about this item

Does the SFP transceiver generate noticeable heat or noise when running continuously in a server?

The module is a passive copper SFP with no fan, so it runs silently and produces only minimal heat during all-day operation.

What port type must my switch or server already provide for this transceiver to work?

An open SFP slot that supports 1000Base-T electrical interfaces is required; the transceiver then presents an RJ-45 jack for copper cabling.

Will this transceiver interoperate with older 10/100 Mbps network gear connected over the same copper run?

Yes, the port negotiates 10/100/1000Base-T speeds, so legacy Fast Ethernet devices will link at their highest supported rate.

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