LQ-M85100-SR4C 100GBASE SR4 QSFP28 100m 850nm OM4 DOM MPO-12 Parallel MMF Optical Transceiver Module

Product Specifications

Key Benefits of LINK-PP LQ-M85100-SR4C 100GBASE-SR4 QSFP28 Optical Transceiver

• Full 100G Aggregate Bandwidth over Short-Reach Multi-Mode Fiber: Delivers 100 Gbps parallel data transmission over OM3 (up to 70m) or OM4 (up to 100m) MMF trunks, ideal for intra-rack and Top-of-Rack (ToR) switch links.
• Built-In Transmit & Receive CDR Retimers: Dual-direction CDR circuits retime incoming electrical signals per 25G lane, compensating for host board trace losses and eliminating jitter propagation.
• Low Power Consumption (≤3.3W) for High-Density Switches: Draws ≤3.3W max under full load, preventing thermal throttling in densely populated 32-port 1U 100G switch line cards.
• SFF-8636 Compliant Per-Lane DOM Telemetry: Features real-time optical diagnostics providing granular lane-by-lane visibility into transmitter bias currents, optical input power, output power, and module temperature.
• Hot-Pluggable QSFP28 MSA Form Factor: Easily inserted or removed from active 100G QSFP28 switch ports without powering down host equipment or disrupting adjacent network traffic.
• Multi-Vendor Switch Interoperability Backed by 5-Year Warranty: Pre-programmed EEPROM firmware guarantees error-free recognition in Cisco, Arista, Juniper, Dell, FS.com, and generic 100G switches.

100GBASE-SR4 Parallel Optics & CDR Architecture

The LINK-PP LQ-M85100-SR4C operates under the 100GBASE-SR4 protocol defined in IEEE 802.3bm and SFF-8665 QSFP28 MSA specifications, utilizing 4 parallel 25.78125 Gbps NRZ lanes to achieve 100 Gbps aggregate bandwidth.

850nm VCSEL Array & 4-Lane Parallel Transmission

The electro-optic engine incorporates a 4-channel 850nm Vertical-Cavity Surface-Emitting Laser (VCSEL) array operating with an average TX power between -8.4 dBm and +2.4 dBm. On the receive side, four PIN photodiodes with TIA preamplifiers provide a minimum receiver power sensitivity of -10.3 dBm and a 2.4 dBm overload threshold. Internal CDR circuits retime both TX and RX 25G channels, ensuring clean eye diagrams over MTP/MPO-12 multi-mode ribbon cables when paired with Host Reed-Solomon Forward Error Correction (RS-FEC 528,514).

SFF-8636 Digital Optical Monitoring (DOM) Diagnostics

Utilizing a 2-wire I2C serial interface mapped per SFF-8636 standards, the transceiver provides digital optical telemetry. Network operations engineers can query real-time optical parameters per channel—including RX input power in dBm and TX bias currents—allowing proactive link budget tracking and rapid fault isolation.

Switch Interoperability & ≤3.3W Thermal Efficiency

High thermal density in 100G data center switches demands strict module power budget control. The LQ-M85100-SR4C addresses this through energy-efficient IC driver design.

≤3.3W Power Dissipation & Plug-and-Play EEPROM

Operating at ≤3.3W max per port, the LQ-M85100-SR4C prevents heat accumulation in switch line cards. Pre-programmed with accurate vendor EEPROM data maps, it passes host optical verification in Cisco, Arista, Juniper, and Dell switches without manual CLI overrides or throwing vendor-lock alarms.

Target Applications: Data Center Spine-Leaf, ToR Uplinks, and High-Density SANs

Combining 100Gbps aggregate bandwidth, short-reach MMF capability, SFF-8636 DOM telemetry, and QSFP28 MSA compliance, the LINK-PP LQ-M85100-SR4C supports critical optical infrastructure:

• Data Center Spine-Leaf & Top-of-Rack (ToR) Interconnects: Ideal for high-density 100GbE inter-rack server connections and leaf-to-spine switch uplinks over MTP/MPO OM3/OM4 cabling.
• Enterprise Core Switch 100GbE Short-Reach Backbones: Deployed in enterprise data centers for high-speed short-distance switch-to-switch links within the same rack row.
• High-Performance Compute (HPC) Clusters & Storage Area Networks: Suitable for supercomputing clusters, NVMe-over-Fabrics storage arrays, and high-bandwidth interconnects.

How to Select and Verify LQ-M85100-SR4C vs. Cisco QSFP-100G-SR4-S

Network engineers and procurement specialists evaluating the LINK-PP LQ-M85100-SR4C as a secondary-source alternative for Cisco QSFP-100G-SR4-S or generic 100GBASE-SR4 optics should verify the following core parameters:

• Optical Cable & Connector Matching: Confirm that your installed optical fiber infrastructure uses 12-fiber MTP/MPO (Female, Type B polarity) multi-mode cables (OM3 or OM4), as 100GBASE-SR4 is incompatible with single-mode fiber or duplex LC cables.
• Host RS-FEC Requirement for 100m Reach: Ensure that your host switch port has Reed-Solomon Forward Error Correction (RS-FEC per IEEE 802.3bm) enabled to achieve full 100m reach on OM4 MMF.
• Per-Lane DOM Telemetry Verification: Verify multi-channel optical power levels via switch CLI commands such as `show interfaces transceiver` to inspect individual 25G channel launch and receive power levels.
• Power Consumption Budget & Warranty: Confirm that host switch port thermal budgets accommodate ≤3.3W per QSFP28 slot, and verify the 5-Year replacement warranty.