SFP fiber optic transceiver TP-Link ISM311LS 1250 Mbit/s 1310 nm, 3.3 V, grey

TP-Link ISM311LS is a single‑mode SFP fiber optic transceiver designed to provide hot‑pluggable fiber uplinks for switches and network devices. It supports data rates up to 1250 Mbit/s at a wavelength of 1310 nm, operates from a 3.3 V input and is built to meet industrial operating temperature requirements. The compact module is compatible with standard SFP interfaces and IEEE 802.3z networking.

Advantages

The transceiver is hot‑pluggable for flexible installation and replacement, supports Digital Diagnostic Monitoring (DDM) for real‑time module status, and complies with the SFP Multi‑Source Agreement for broad compatibility. Its single‑mode design and industrial temperature rating enable extended reach and reliable operation in harsh environments.

Suitable for

• Extending fiber links up to 20 km for industrial and enterprise networks
• Adding hot‑swappable SFP uplinks to managed and unmanaged switches
• Use in environments requiring wide operating temperature range

Key specifications

• Form factor: SFP (Small Form‑Pluggable)
• Fiber type: single‑mode
• Connector: LC
• Data rate: up to 1250 Mbit/s (1.25 Gbit/s)
• Wavelength: 1310 nm
• Operating voltage: 3.3 V
• Operating temperature range: -40 to 85°C
• Supports Digital Diagnostic Monitoring (DDM)
• Networking standard compatibility: IEEE 802.3z
• Typical reach: up to 20 km
• Color: grey
• Dimensions (approx.): 56.4 × 13.4 × 11 mm

How to use

Insert the ISM311LS module into a compatible SFP port on a switch or network device while the device is powered according to the host equipment instructions. Connect a single‑mode LC fiber cable to the module. The transceiver supports hot‑swap, so it can be inserted or removed without powering down the host if the host device supports hot‑pluggable modules. Monitor the module status and diagnostics via the host switch management interface if available.

Recommendations

Use single‑mode LC fiber and ensure proper polishing and cleanliness of connectors. Verify host compatibility with SFP‑MSA modules and enable DDM monitoring in the switch for real‑time diagnostics. For reliable links, match transceiver wavelength and fiber type at both ends and observe the industrial temperature limits during deployment.