Fiber optic QSFP28 transceiver CBO QSFP28-100G-CWDM4 100G CWDM4 module

The Fiber optic QSFP28 transceiver CBO QSFP28-100G-CWDM4 100G CWDM4 module is a compact QSFP28 form-factor optical module designed for 100Gbps links using coarse wavelength-division multiplexing (CWDM4). It provides short-reach single-mode optical connectivity for aggregation links and data center interconnects between switches, routers and servers. The module supports four CWDM channels aggregated to deliver a 100G Ethernet or similar 100G transport over suitable fiber infrastructure and is intended for high-density network equipment where small size and high bandwidth are required.

Advantages

The module combines the QSFP28 compact footprint with CWDM4 optics to enable efficient 100G transmission over single-mode fiber at short to medium distances. It supports hot-pluggable installation for minimal service interruption and is compatible with standard QSFP28 cages and ports used in modern switches and routers. Its design reduces cabling complexity by aggregating four wavelengths into one transceiver, simplifying link deployment in data center and campus aggregation environments.

Suitable for

• Data center interconnects and spine-to-leaf aggregation links
• High-density switch-to-switch or switch-to-router 100G connections
• Server uplinks in rack or row-level network designs
• Short-reach single-mode fiber links within campus or carrier-neutral facilities

Key specifications

• Form factor: QSFP28 (hot-pluggable)
• Data rate: 100 Gbps aggregate (4×25 Gbps CWDM channels)
• Optical technology: CWDM4 wavelength-division multiplexing
• Fiber type: single-mode fiber
• Typical reach: short to medium distances over single-mode fiber (as specified by system requirements)
• Connector interface: MPO-style parallel connector compatible with CWDM4 cabling

How to use

Insert the QSFP28 transceiver into a compatible QSFP28 port on your switch, router or server adapter while the host port is powered, taking advantage of its hot-pluggable capability. Connect the appropriate single-mode MPO cable that matches CWDM4 channel assignments, ensuring correct fiber polarity and connector type. Verify link status and diagnostics through the network device management interface and monitor optical parameters such as received power and temperature to confirm proper operation.

Recommendations

Use certified single-mode MPO cabling rated for CWDM4 channels and ensure transceiver compatibility with the host equipment. Observe manufacturer guidelines for operating temperature and optical power budgets; perform link testing after installation and maintain clean connector end-faces to prevent signal loss.