FS COB vs. BOX 100GBASE-LR4 QSFP28 Transceiver Difference

Updated on Apr 15, 2022

Note: FS has discontinued 100G QSFP28-LR4 COB packaging transceivers. As per our policy, customers will continue to get support from FS technical assistance team, and the valid warranty provided is maintained on the product. For customers who are interested in FS 100G QSFP28-LR4 COB packaging transceivers, you can choose 100G QSFP28-BLR4 BOX packaging transceivers.


These two FS QSFP28 transceivers are very similar, Cisco QSFP-100G-LR4-S Compatible module for Data Center and Cisco QSFP-100G-LR4-S Compatible Module, right? If you are confused about these two transceivers, please continue to read the following content to learn more.

Features and Spcifications

Form Factor QSFP-100G-LR4-S for Data Center QSFP-100G-LR4-S
Wavelength 1310nm 1310nm
Max Cable Distance 10km 10km
Cable Type SMF SMF
Transmitter Type 4 x LAN WDM DML (DFB) 4 x LAN WDM DML (DFB)
Receiver Type PIN PIN
DDM/DOM Supported Supported
TX Power -4.3~4.5dBm -4.3~4.5dBm
Receiver Sensitivity <-10.6dBm <-10.6dBm
Power Consumption ≤4W ≤3.5W
Modulation Format NRZ NRZ
Packaging Technology COB (Chip on Board) Packaging BOX Packaging
Price US$ 499.00 US$ 499.00
Application Data Center, 100G Ethernet Telecom, Data Center, 100G Ethernet, 5G Wireless Network

Table 1. FS 100G-LR4 QSFP28 specifications

QSFP-100G-LR4-S With COB Packaging for Data Center

QSFP-100G-LR4-S for data center applies COB (Chip on Board) packaging, of which the laser chip is directly adhered to the PCB. It's beneficial for saving PCB area and eliminating the complex packaging steps which can reduce the transceiver production cost. And with the maturity of related technology and equipment operation, mass production becomes easier. COB package meets the requirements of high reliability and low cost. So this QSFP-100G-LR4-S module is suitable for data centers, high-performance computing networks, campus networks etc. applications.


QSFP-100G-LR4-S With BOX Packaging

While QSFP-100G-LR4-S applies box packaging. As to BOX packaging, it is one of the hermetic packing methods. The laser chip is sealed in a metal shell filled with inert gas, in this way, the laser chip will not be influenced by the changing temperature and water vapour. It meets the requirements of higher reliability and harsher environments, like telecom ones with no air-conditioning or environment monitoring equipment. That's why modules designed with box packaging win more popularity among telecom operators. What's more, it has the power consumption of fewer than 3.5W. This QSFP-100G-LR4-S module is suitable for 100G telecom, data center, high-performance computing network, campus network.


FS offers these two types of 100G-LR4 QSFP28 transceivers to meet different appliation demands of data center and telecom. From our product title you can easily find out if it's what you want. For instance, the one with "data center" in product title Cisco QSFP-100G-LR4-S Compatible module for Data Center shows that it is suitable used in data centers.

You might be interested in