FAQ Questions and Answers for+ SFP+ transceiver

1.What's the difference between SFP-10G-SR and SFP-10G-LR?

This one is actually pretty easy.  SR stands for Short Reach, and LR stands for Long Reach.  SR transceivers are almost always multi-mode, and optimized for high speeds over relatively short distances.  However, the much higher-powered OM3 and OM4 formats can push that into the hundreds of meters for a single cable.

LR transceivers are designed for long-range communications, such as wiring buildings together on a large campus or even setting up a Metro Area Network (MAN).  They can be either multi-mode or single-mode, and are almost always intended for 100m+ applications.  Higher end cables and transceivers can support transmissions of several kilometers.

2.What are SFP-10G-ER and SFP-10G-ZR?

Basically, these are just extremely long-range fiber variations.  ER stands for Extended Reach, and can achieve transmission distances of up to 40km over single-mode fiber.

ZR is actually an unofficial format, which is not technically part of the IEEE 802.3ae standards for networking hardware.  It pushes the range of single-mode ER fiber out to 80km, or about 50 miles.  Several hardware manufacturers -including Cisco- have their own implementations of ZR, but they aren't necessarily cross-compatible. 

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