QSFP-40G-SR-BD – 40G SR-BiDi QSFP – LC MMF – 150m OM4
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QSFP-40G-SR-BD Description
QSFP-40G-SR-BD is a Cisco 40GBASE-SR-BiDi QSFP optical transceiver for 40G Ethernet links over duplex LC multimode fiber, used to add short-reach 40G connectivity on Cisco QSFP 40G host ports without replacing installed duplex MMF cabling. The module uses a duplex LC connector, 832 to 918 nm transmit and receive wavelengths, two 20-Gbps optical channels, and supports 30 m on OM2, 100 m on OM3, and 150 m on OM4 or OM5 fiber, with 3.5W power consumption, a gray pull tab, and +10 to 70 degrees C operating temperature.
Quick Specs
|
Parameter |
Specification |
|---|---|
|
Product ID |
QSFP-40G-SR-BD |
|
Product type |
40GBASE-SR-BiDi QSFP optical transceiver |
|
Form factor |
QSFP |
|
Ethernet rate |
40 Gigabit Ethernet |
|
Connector type |
Duplex LC |
|
Fiber type |
Multimode fiber |
|
Wavelength range |
832 to 918 nm |
|
Reach on OM2 |
30m |
|
Reach on OM3 |
100m |
|
Reach on OM4 or OM5 |
150m |
|
Power consumption |
3.5W |
Application Scenarios
QSFP-40G-SR-BD fits short-reach data center links where the installed fiber plant already uses duplex LC multimode patching and the design goal is 40G Ethernet without replacing the run with MPO-12 parallel fiber.
Keep this Cisco BiDi module in spare inventory for supported QSFP 40G ports that are cabled with two-strand MMF. Receiving teams should keep it separate from SR4 and CSR4 optics because the connector and fiber-count requirements are not interchangeable.
The Cisco tables make connector loss part of the order check for BiDi links. OM3 and OM4 or OM5 designs should be reviewed against the documented reach and allowable connector-loss values before a maintenance window is scheduled.
Product Comparison
|
Parameter |
QSFP-40G-SR-BD |
QSFP-40G-CSR-S |
QSFP-40G-BD-RX | |
|---|---|---|---|---|
|
Product type |
40GBASE-SR-BiDi QSFP transceiver |
40GBASE-SR4 QSFP transceiver |
40GBASE-CSR QSFP transceiver |
40GBASE-SR-BiDi QSFP monitor |
|
Connector type |
Duplex LC |
MPO-12 |
Duplex LC |
Duplex LC |
|
Fiber type |
Multimode fiber |
Multimode fiber |
Multimode fiber |
Multimode fiber |
|
Wavelength range |
832 to 918 nm |
840 to 860 nm |
850, 880, 910, and 940 nm |
832 to 918 nm |
|
Reach on OM3 |
100m |
100m |
300m |
100m |
|
Reach on OM4 or OM5 |
150m |
150m |
400m on OM4 and 440m on OM5 |
150m |
|
Power consumption |
3.5W |
1.5W |
3.5W |
3.5W |
|
Pull tab color |
Gray |
Beige |
Orange |
Beige or gray with Rx mark |
|
Transmit function |
Transmits and receives |
Transmits and receives |
Transmits and receives |
Receive-only monitor module |
- In a QSFP-40G-SR-BD vs QSFP-40G-SR4 comparison, the main difference is cabling: QSFP-40G-SR-BD uses duplex LC MMF while QSFP-40G-SR4 uses MPO-12 parallel MMF.
- The QSFP-40G-SR-BD difference from QSFP-40G-CSR-S is reach and wavelength design, because CSR-S is the longer duplex LC 40GBASE-CSR option in the table.
- QSFP-40G-SR-BD vs QSFP-40G-BD-RX is a transceiver versus monitor comparison; BD-RX has the same LC BiDi media profile but is listed as a receive-only monitor module.
- For which model to choose, match the Cisco SKU to connector type, multimode fiber reach, transmit function, and host compatibility shown in Cisco documentation.
Selection Guide
1. Choose it for LC BiDi 40G links
Select QSFP-40G-SR-BD when the BOM requires Cisco 40G Ethernet over duplex LC multimode fiber and the link can stay within the documented OM2, OM3, OM4, or OM5 distance class.
2. Keep SR4 orders on MPO-12 cabling
Use QSFP-40G-SR4 instead when the physical design is based on 12-fiber MPO parallel MMF rather than duplex LC BiDi cabling.
3. Move to CSR-S only for longer duplex MMF requirements
Choose QSFP-40G-CSR-S only when the Cisco order requires the longer 300m OM3, 400m OM4, or 440m OM5 reach profile shown for CSR-S.
4. Validate host and optical path together
Confirm the Cisco platform, QSFP 40G port support, software compatibility, far-end optic, fiber grade, connector loss, and +10 to 70 degrees C operating range before approving the line item.
Ordering Checklist
|
Check Item |
What to Confirm |
Procurement Risk Controlled |
|---|---|---|
|
Cisco host support |
Target switch or router, QSFP 40G port, and software support in Cisco compatibility documentation |
Keeps the optic tied to a supported Cisco device |
|
Fiber connector |
Duplex LC multimode patching with PC or UPC connector polish |
Avoids mixing this BiDi optic with MPO-12 SR4 cabling |
|
Fiber grade and distance |
OM2 to 30m, OM3 to 100m, or OM4 and OM5 to 150m |
Aligns the order with Cisco’s cabling table |
|
Connector-loss allowance |
Patch panels and connector count checked against Cisco BiDi loss guidance |
Reduces turn-up risk on short multimode runs |
|
Far-end optic |
Matching Cisco-supported 40G SR-BiDi transceiver at the other end |
Prevents wavelength and signaling mismatch |
|
Operating temperature |
+10 to 70 degrees C host environment |
Separates this BiDi optic from general 0 to 70 degrees C QSFP assumptions |
Specifications
| Parameter | Specification | Parameter | Specification |
|---|---|---|---|
| Product ID | QSFP-40G-SR-BD | Product type | 40GBASE-SR-BiDi QSFP optical transceiver |
| Ordering description | Cisco 40GBASE-SR Bi-Directional QSFP Module for Duplex MMF | Form factor | QSFP |
| Host interface | Cisco QSFP 40G port | Ethernet rate | 40 Gigabit Ethernet |
| Connector type | Duplex LC | Fiber type | Multimode fiber |
| Core size | 50 microns | Modal bandwidth | 500 MHz*km on OM2; 2000 MHz*km on OM3; 4700 MHz*km on OM4 or OM5 |
| Reach on OM2 | 30m | Reach on OM3 | 100m |
| Reach on OM4 | 150m | Reach on OM5 | 150m |
| Transmit and receive wavelength range | 832 to 918 nm | Optical channel structure | Two 20-Gbps transmit and receive channels |
| Transmit power per lane | -4 to +5 dBm | Receive power per lane | -6 to +5 dBm |
| Power consumption | 3.5W | Pull tab color | Gray |
| Operating temperature range | +10 to 70 degrees C | Patch-cord requirement | PC or UPC connector polish |
| QSFP module dimensions | 13.5 x 18.4 x 72.4 mm maximum outer dimensions | QSFP module weight | 100 grams or less |
| BER note | 1E-12 at 150m on OM4 or OM5 | Compatibility reference | Cisco Optics-to-Device Compatibility Matrix |
Get More Information
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Questions & Answers
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What is QSFP-40G-SR-BD used for?
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Which connector does QSFP-40G-SR-BD use?
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What reach applies to QSFP-40G-SR-BD on duplex MMF?
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Why is QSFP-40G-SR-BD popular in migration projects?
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Can QSFP-40G-SR-BD create four 10G lanes?
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What wavelength detail matters for QSFP-40G-SR-BD?
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When is QSFP-40G-SR-BD wrong for a rack?
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Which compatibility check belongs with QSFP-40G-SR-BD?
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