Q1: What is a QSFP28-100G-SR4 module?
A: The QSFP28-100G-SR4 is a QSFP28 transceiver designed for 100 Gbps Ethernet over multimode fiber (MMF), operating at 850 nm wavelength using a twelve-fiber MPO/MTP connector.
Q2: What is the supported transmission distance?
A: Up to 70 m on OM3 and 100 m on OM4 multimode fiber.
Q3: What connector and fiber type does it use?
A: Uses a 12-fiber MPO/MTP connector over 50/125 µm multimode fiber (OM3/OM4).
Q4: Is this module compatible with equipment across different brands?
A: Yes. It adheres to QSFP28 Multi-Source Agreement (MSA) and is broadly compatible with Cisco, Arista, Hewlett Packard, Juniper, Dell, Huawei, Palo Alto Networks, etc.
Q5: Is the module hot-pluggable?
A: Yes. QSFP28-100G-SR4 supports hot swapping, enabling insertion/removal without powering off the host device.
Q6: Does QSFP28-100G-SR4 support diagnostic monitoring (DDM/DOM)?
A: Yes. It supports Digital Diagnostic Monitoring (DDM/DOM), providing real-time reporting of temperature, voltage, optical power, and module status.
Q7: What is the aggregate data rate and per-lane rate?
A: Supports up to 103.125 Gbps aggregate, with each of the four lanes operating at 25 Gbps NRZ.
Q8: What is the typical power consumption?
A: Typical power consumption is ≤ 3.5 W, depending on vendor and operating conditions.
Q9: What are the operating temperature specifications?
A: Standard commercial range is 0 °C to 70 °C, with some industrial variants supporting -40 °C to +85 °C.
Q10: What IEEE or MSA standards does it comply with?
A: Compliant with IEEE 802.3bm for 100GBASE-SR4, and QSFP28 MSA (SFF-8665, SFF-8636) standards.
Q11: How to verify module compatibility with my networking device?
A: Check if your device supports 100GBASE-SR4 optics and allows third-party QSFP28 modules. Many MSA-compliant products are pre-programmed for specific brands (e.g., Palo Alto, Cisco).
Q12: What are typical application scenarios?
A: Commonly used in data center spine-leaf architectures, rack-to-rack links, high-speed interconnects over OM3/OM4 fiber in enterprise or HPC environments.
Q13: Can QSFP28-100G-SR4 be used in breakout mode to four separate 25G links?
A: Yes-when supported by the host, it can perform 4×25G breakout, connecting each lane to a 25G SFP28 SR module.
Q14: What is the typical link budget per lane (optical power)?
A: Transmitter power per lane: -8.4 to +2.4 dBm; receiver sensitivity: around -10.3 dBm, allowing comfortable margin for 100 m OM4/70 m OM3 operation.
Q15: Are there variants supporting extended reach or industrial conditions?
A: Limited-SR4 is for short-range only; extended-reach QSFP28 variants include LR4, ER4 with single-mode support. Industrial-temperature SR4 modules are available, typically supporting -40 °C to +85 °C.