Cisco GLC-SX-MM Compatible 1000BASE-SX SFP 850nm 550m DOM LC MMF Transceiver Module

I bought these modules for regular replacements in our server rooms. I was a bit skeptical at first since it was a new brand for me, but they’ve exceeded my expectations! They arrived just four days after I ordered them, and the packaging was great. I've been using them with switches from Cisco, Arista, H3C, and more for the past two weeks, and so far, everything's running smoothly with no errors.

When I run a digital monitoring command, the parameters in the DOM state match the specs perfectly.

The switch detected the optics in a second. They always produce quality transceivers, with no complaints.

Not the first time to buy from QSFPTEK. Plugged in and got 1000Mbps, no exceptions. The modules are working stably on my switches. Recommended for the price and quality.

The price is cheaper than other big brands. I think this 1G optical module is a relatively common product, so there is no need to buy expensive ones.

I received the product very quickly. And the product can be used well, Works fantastic with my third party switch.today I ordered again.

Excellent service, great product and fast shipping, Considering this was imported into the UK, it was a speedy delivery.

This module was just what I needed for my network setup. It's fast, reliable, and compatible with a variety of devices. Installation was a breeze, and I haven't had any issues with connectivity since I started using it.

The QSFPTEK product is top notch, the price is right, the pre-sales support is great, and the shipping was so fast that I received it on the third day.

For less than $7 each, these convert perfectly from the SFP+ on my Ubiquiti switch, awesome!