• Silver-colored arista H-D400-4Q100-1M sfp+ transceiver modules with blue handles and metallic connectors for 400g active DAC
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Arista

Arista QSFP-40G-SRBD-R-Arista | 40G BiDi QSFP+ Transceiver, 850/900nm, 150m MMF, LC

QSFP-40G-SRBD-R-Arista

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Description

The Arista QSFP-40G-SRBD-R is a bidirectional 40GBASE-SR BiDi QSFP+ optical transceiver designed for short-reach data center and enterprise network applications. It transmits 40 Gbps over duplex multimode fiber using bidirectional optics at 850nm and 900nm wavelengths, supporting distances up to 100m on OM3 or 150m on OM4 fiber. The duplex LC connector allows reuse of existing 10G fiber infrastructure, eliminating the need for costly parallel fiber upgrades while delivering full 40 Gigabit Ethernet performance.

Features

Bidirectional optics enable 40G transmission over duplex LC fiber (2 strands vs 8 for SR4)
- Internally multiplexes 4x10G lanes into two 20 Gbps optical channels
- Reuses existing 10GBASE-SR duplex fiber infrastructure for cost-effective 40G migration
- Hot-pluggable QSFP+ form factor for easy installation and maintenance
- Digital diagnostics monitoring (DDM/DOM) for real-time performance visibility
- VCSEL laser technology operating at 850nm and 900nm wavelengths
- Commercial temperature range (0°C to 70°C) for standard data center environments
- Compliant with QSFP MSA SFF-8436 industry standards
- Low power consumption with 3.3V operation
- CE and RoHS certified for environmental and safety compliance
- Interoperable with third-party 40GBASE-SR BiDi transceivers
- Supports multiple protocols including 40G Ethernet, STM-256, OTU3, and OTU3e2

Warranty

All products sold by XS Network Tech include a 12-month warranty on both new and used items. Our in-house technical team thoroughly tests used hardware prior to sale to ensure enterprise-grade reliability.

All technical data should be verified on the manufacturer data sheets.

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Technical Specifications

FAQs

Technical Specifications

Form Factor: QSFP+ (Quad Small Form-factor Pluggable)
- Data Rate: 40 Gbps (39.81-44.8 Gbps supported)
- Wavelength: Ch1: 850nm / Ch2: 900nm (bidirectional)
- Fiber Type: Multimode (OM3/OM4)
- Maximum Distance: 100m over OM3, 150m over OM4
- Connector Type: Duplex LC
- Electrical Interface: 38-pin QSFP+ edge connector
- Optical Technology: VCSEL laser transmitter, PIN photodiode receiver
- Operating Temperature: 0°C to 70°C (commercial grade)
- Digital Diagnostics: DDM/DOM support (SFF-8436 compliant)
- Power Supply: 3.3V
- Applications: 40G Ethernet (41.25 Gbps), STM-256 (39.81 Gbps), OTU3 (43.01 Gbps), OTU3e2 (44.58 Gbps)
- Compliance: QSFP MSA SFF-8436, CE/RoHS certified

FAQs

Q: What is the difference between this BiDi transceiver and the SR4 model?
A: The QSFP-40G-SRBD-R uses bidirectional optics over duplex LC fiber (2 strands), while the SR4 requires parallel MTP/MPO fiber (8 strands). The BiDi model allows you to reuse existing 10G duplex fiber infrastructure, reducing cabling costs and complexity.

Q: Is this transceiver compatible with non-Arista equipment?
A: Yes, the QSFP-40G-SRBD-R follows the 40GBASE-SR BiDi standard and interoperates with third-party 40G BiDi transceivers over standard OM3 or OM4 duplex multimode fiber, making it compatible with other vendor platforms that support BiDi optics.

Q: Can I use this transceiver with OM2 or OM1 fiber?
A: This transceiver is optimized for OM3 and OM4 fiber. While it may physically connect to OM2 or OM1, these legacy fiber types have higher attenuation and significantly reduced reach, so they are not recommended for reliable 40G operation.

Q: What applications are supported by this transceiver?
A: The QSFP-40G-SRBD-R supports 40G Ethernet (41.25 Gbps), STM-256 (39.81 Gbps), OTU3 (43.01 Gbps), and OTU3e2 (44.58 Gbps). Actual application support may vary depending on the switch or router port configuration.

Q: Does this module support digital diagnostics monitoring?
A: Yes, the transceiver includes DDM/DOM functionality compliant with SFF-8436 MSA specifications, allowing real-time monitoring of temperature, voltage, transmit/receive optical power, and other diagnostic parameters for proactive network management.

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