Difference Between Finisar 1000BASE-T FCxx-8520and 8521-3 SFPs

Finisar's 1000BASE-T SFP transceivers are based on the SFP Multi Source Agreement (MSA). Additionally, theyare compatible with Gigabit Ethernet and 1000BASE-T standards as specified in IEEE Std. 802.3:2002. FCxx-8520/8521-3 is its product model, which includes four products, ie. FCMJ-8520-3, FCMJ-8521-3, FCLF-8520-3and FCLF-8521-3. Generally speaking, they are both 1000BASE-T SFPs and have the similar functions. However,there are some difference between them which we can easily distinguish via the difference in the model, such asFCMJ and FCLF, the 8520 and 8521. This paper will talk about the difference between them.

What Does 1000BASE-T Mean?

Before we begin to talk about the difference between the FCxx-8520/8521-3 SFPs, we first understand the"1000BASE-T". 1000BASE-T is defined in IEEE802.3:2002. The "1000" in the designation refers to thetransmission speed of 1000 Mbps. The "BASE" refers to BASE band signaling, indicating that only Ethernetsignals are carried on the medium. The "T" represents twisted-pair copper cable (for example Cat 5). So we offercalled this kind of transceiver as the copper transceiver module. If the "T" is replaced by the "X", it representsfiber optic cable.

What Is The Difference Between The FCxx-8521-3 & The FCxx-8520-3?

The FCxx-8521-3 is designed to be a 1000BASE-X compliant device that functions properly in any slot designedfor optical SFP's, with no hardware or software changes to the host system. The PHY is configured to perform1000BASE-X auto-negotiation with the host system. The FCxx-8521-3 does not have link detection circuitry-theRxLOS pin is internally grounded. The FCxx-8520-3 is similar to the FCxx-8521-3, but the 1000BASE-Xautonegotiation is disabled. For this device to operate, auto-negotiation should also be disabled in the host system.In the FCxx-8520-3, the RxLOS pin functions as a link indicator-RxLOS is asserted when the 1000BASE-T link islost. Typically, this device is used in systems where the host cannot determine the link status without using RxLOSas a link indicator.

What Is The Difference Between The FCMJ-8520/8521-3 & The FCLC-8520/8521-3?

The FCMJ-8520/8521-3 versions are RoHS 5/6 while the FCLF-8520/8521-3 versions are fully RoHS compliant.

What Cable Type Is Recommended For Use With The FCxx-8520/8521-3?

The FCxx-8520/8521-3 was designed to operate using standard Cat 5 cable that has been configured perIEEE802.3:2002. You can safely use Cat 5e or Cat 6 cables, as these are improved versions of Cat 5. For shortcable runs, with intricate routing, stranded cable is recommended, as it is more flexible.

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Better Choice of Compatible Finisar 1000BASE-T FCxx-8520/8521-3 SFPs

With a starting point of saving cost, more and more people would like to use the compatible fiber optictransceivers. When you doing some research for your purchase plan, you will find that there is a wide range ofoptions for compatible transceivers of the famous and commonly used brands, such as Cisco, HP, Finisar or Delletc. in the market which are offered by different manufacturers or vendors. It is really a headache for choosing thebest compatible SFPs that can fully satisfy your demands. We can't do anything except comparing the price andshipping time in the ocean of the compatible transceivers. For better choice of the compatible SFPs of the Finisar1000BASE-T SFPs (FCLF-8521-3), we highly recommend you Fiberstore NEW Finisar FCxx-8520/1-3Compatible 1000BASE-T SFP Transceiver Module as its low cost, high quality and excellent service. In addition,compatible transceivers of other brands can also be found in Fiberstore. You can save more time on searching for agood vendor or good compatible transceivers. Just have a try, Fiberstore will bring you the best experience.

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