Overview
The 100G QSFP28 ER4 Fiber Transceiver is a high-performance, long-reach optical module designed for 100 Gigabit Ethernet links up to 40 kilometers. Compliant with the 100GBASE-ER4 standard, this module is the ideal solution for Metro Area Networks (MAN), Data Center Interconnects (DCI), and telecom backhaul applications where distances exceed the capabilities of standard LR4 (10km) modules.
This transceiver utilizes LAN-WDM technology, integrating an internal multiplexer and demultiplexer to transmit four channels of 25Gbps data over a single pair of Single Mode Fibers (Duplex LC). By employing high-sensitivity APD (Avalanche Photodiode) receivers, it achieves stable 40km transmission without the need for external optical amplifiers.
Key Features
- Reach: Up to 40km on standard Single Mode Fiber (SMF) with FEC.
- Data Rate: 103.1 Gbps (100GBASE-ER4).
- Wavelengths: 4-lane LAN-WDM (1295.56, 1300.05, 1304.58, 1309.14 nm).
- Connector: Duplex LC.
- Receiver: High-sensitivity APD (Avalanche Photodiode).
- Power Consumption: < 4.5W (High-efficiency design).
- Compliance: QSFP28 MSA, IEEE 802.3ba 100GBASE-ER4, RoHS.
Applications
- Data Center Interconnect (DCI): Connecting geographically separated data centers within a city.
- ISP Backhaul: Aggregating traffic from access rings to the core network.
- Campus Networks: High-bandwidth uplinks between buildings or university campuses spread over large areas.
- 5G Mobile Fronthaul: Supporting high-capacity transport for mobile network infrastructure.
Specifications
| Parameter | Value |
|---|---|
| Model Name | QSFP28-100G-ER4 / 100GBASE-ER4 |
| Form Factor | QSFP28 |
| Max Distance | 40km (with FEC) / 30km (without FEC) |
| Wavelength | LAN-WDM (1295nm – 1310nm range) |
| Fiber Type | Single Mode (OS2) |
| Interface | Duplex LC |
| Transmitter | EML (Electro-absorption Modulated Laser) |
| Receiver | APD (Avalanche Photodiode) |
| Tx Power (Total) | Max +2.9 dBm |
| Rx Sensitivity | < -20 dBm (varies by BER requirement) |
| Operating Temp | 0°C to 70°C (Commercial) |
Important Usage Note: Attenuation
The 100GBASE-ER4 module uses high-powered lasers and sensitive APD receivers. If connecting this module over a very short distance (e.g., testing in a lab or <2km links), you MUST use optical attenuators (typically 5dB to 10dB). Connecting two ER4 modules directly with a short patch cable can permanently damage the receiver due to optical overload.
Compatibility
This transceiver follows the open MSA (Multi-Source Agreement) standards and is compatible with a wide range of 100G switches and routers, including equipment from:
- Cisco (Nexus, ASR, NCS series)
- Juniper Networks (MX, PTX, QFX series)
- Arista Networks
- Huawei / ZTE
- Dell, HP, and Extreme Networks
FAQ
1. What is the difference between ER4 and ER4-Lite?
ER4 is fully compliant with the IEEE 100GBASE-ER4 standard and guarantees 40km reach (often requiring host FEC). ER4-Lite is a non-standard vendor implementation that typically reaches 30km without FEC or 40km with strong FEC, often at a lower cost point. This product page refers to the ER4 specification capable of 40km.
2. Do I need Forward Error Correction (FEC)?
Yes. To achieve a stable bit error rate (BER) over the full 40km distance, enabling RS-FEC (Reed-Solomon Forward Error Correction) on the host switch port is highly recommended and often required by the IEEE standard for this distance.
3. Can I connect an ER4 module to an LR4 module?
Generally, no. While the wavelengths (LAN-WDM) match, the power levels differ significantly. The ER4 transmits at higher power and has a more sensitive receiver. Connecting them could result in link flaps or damage to the LR4 receiver. Always use matched pairs.
4. What cable type is required?
Standard Single Mode Fiber (SMF) with **Duplex LC** connectors (OS2 G.652).
5. Does this module support DDM?
Yes, Digital Diagnostic Monitoring (DDM/DOM) is supported, allowing you to monitor temperature, voltage, laser bias, and optical power levels via the switch command line.
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