Finisar 40Gbase ER4 FTL4E1QM1C FTL4E1QE1C 40GBASE-ER4 Multirate 40G 40km QSFP+ Optical Transceiver in 40Gigabit Ethernet link

TopStar proudly own 3,000 Square Meters complete Dust-Free workshop. Together with our 30 dedicated engineering experts in the R&D, we create excellent products. Applying the industrial best Management Practice combined with full range of test equipments, we stand to be the expert in Optical Transceiver field. These expertise enabling us the ability to supply almost full series of High Quality products. 

Our Top-Trans product ranges cover: 
SFP, SFP+ ,XFP

BIDI, CWDM / DWDM 

40G / 100G QSFP+ 
40G / 100G CFP 
X2, Xenpak
Epon/Gpon/Xgpon
CSFP, ESFP 

1*9, SFF, Gbic 
etc.. 

1. Professional testing equipments: Error Detector/ Industrial Oven/ Agilent Oscilloscope/ Digitizer/ WaveRunner for producing process. Juniper/ Brocade/ Alcatel-lucent/Huawei/ERICSSON/ Datacom etc. guarantee compatibility.
2. Specialized in developing and producing the most Hi-tech products like: 40G QSFP+/ 100G CFP/CFP2/CFP4 / QSFP28 / 25G SFP28 / 200G QSFP56 /400G QSFP DD/400G OSFP . Every month sales qty transceivers more than 10W pcs .
3. OEM Compatible transceivers have 3-year warranty , support 3 months unconditional return , 1 year replacement or repair . Brand transceivers have 1 year warranty .
4.Stocks holds more than 200,000 transceivers at any one time for immediate delivery. Shenzhen sales center, Shenzhen OEM/ODM factory , Shenzhen warehouse , HK warehouse , USA San Francisco branch to support fast service and shipment .

1 . What will you do if I found it has any quality problem?

Answer: We back up every sale with our risk-free money-back guarantee!
You can buy with confidence from a company in good faith that has been serving its clients for over 7 years!

2. How does your company do regarding quality control?
Answer: We have professional testing equipment and QC team. Every unit will be double tested with perfect performance before shipping.

3. What are the trade terms?
Answer: Lead Time: 1 day after confirm your payment (In stock, we need 1 day to full test them)
Payment term: Western union, T/T, Aliexpress escow, money gram
Warranty: 3 years