Best in 7 days
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Description
Cisco QSFP-40G-SR-BD Compatible 40GBASE-SR SWDM4 QSFP+ BiDi 850/880/910/940nm 300m DOM Duplex LC/UPC MMF Optical Transceiver ModuleThe Cisco Compatible 40GBASE SWDM4 Bi Directional QSFP+Transceiver is designed for use in 40 Gigabit Ethernet links over duplex multimode fiber (MMF. This transceiver is compliant with the QSFP+ MSA and IEEE 802. 3ba XLPPI electrical interface. The SWDM4 transceiver enables reuse of its existing 10G duplex MMF infrastructure for migration to 40G with a path toward 100G. Digital diagnostics functions are available via an I2C interface, as specified by
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- We offer a 30-day return/exchange service after receiving.
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Best in 7 days
Best in 7 days
Best in 7 days
Best in 7 days
4.6 ★★★★★
Based on 359 reviews
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Product Reviews
★★★★★ 1
Too small for the shown size.
Size: XX-Large, Color: Black, Size: XX-Large, Color: Black
I usually would buy XL size but in this case I bought XXL thinking since it's cotton it might shrink. But when I tried the T-shirt it was too small. My older XL sized T-shirt has 2 1/2" larger total shoulder width and 3" wider body width. See attached pictures. Length was also a bit shorter by about 1/2". I will to return it.
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Reviewed in the United States on April 15, 2026
★★★★★ 2
Does not match the size
Size: 3X-Large, Color: Blue
Way smaller than the size indicated. Very thin material, almost see- thru.
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on December 5, 2025
★★★★★ 5
Will buy again
Size: XX-Large, Color: White
Very comfortable. Fits as expected,
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Reviewed in the United States on September 15, 2025
★★★★★ 5
Feels good on a cool day.
Size: Large, Color: Navy Blue
Why did you pick this product vs others?:
I was looking for a mock turtle neck T-shirt so I was a bit surprised they were almost like a very light undershirt or sweater., or heavy tee. I like to wear them when it's cool or under a shirt or sweater.
Washability:
Machine wash, dry on warm as it's got spandex in it. Has held up to machine washing without loosing elasticity.
Quality:
Not a highly refined shirt. Quality is ok but could be better.
Weight:
About like a heavy tee shirt or very light undershirt.
Fit:
About like a tee shirt. Loose fit.
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Reviewed in the United States on June 29, 2025
★★★★★ 5
The material and tight fitting helps keep you warm…
Size: Large, Color: Green
I am 5’8” tall and weigh in at 172 lbs dressed. These are the most comfortable cold weather shirts I have ever worn. In my humble opinion, what makes these shirts so comfortable and warm is the tight fitting and the soft, fleece like feeling on my skin. I wear and ordered the large size. The shirt is cut so they fit close to one’s body and look great compared to other brands of shirts that end up looking like one is wearing a potato bag. The tight fitting helps keep me feeling warm. No cold air pockets.
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Reviewed in the United States on January 27, 2026
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