QSFP-40G-SR4 – 40G SR4 QSFP – MPO-12 MMF – 4x10G Breakout
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QSFP-40G-SR4 Description
QSFP-40G-SR4 is a Cisco 40GBASE-SR4 QSFP optical transceiver for 40 Gigabit Ethernet links on Cisco QSFP 40G host ports, using four 10G optical lanes over MPO-12 multimode fiber at 850 nm. It is used for short-reach data center and campus aggregation fiber runs, with Cisco-confirmed reach of 30 m on OM2, 100 m on OM3, and 150 m on OM4 or OM5 fiber. The module supports 4x10G breakout with an external 12-fiber parallel-to-duplex breakout cable, consumes 1.5W, operates from 0 to 70 degrees C, and requires host-platform support to match Cisco optical compatibility data for the installed device.
Quick Specs
|
Parameter |
Specification |
|---|---|
|
Product ID |
QSFP-40G-SR4 |
|
Product type |
40GBASE-SR4 QSFP optical transceiver |
|
Form factor |
QSFP |
|
Ethernet rate |
40 Gigabit Ethernet |
|
Optical lane design |
Four 10G lanes |
|
Connector type |
MPO-12 |
|
Fiber type |
Multimode fiber |
|
Wavelength |
850 nm |
|
Reach on OM2 |
30m |
|
Reach on OM3 |
100m |
|
Reach on OM4 or OM5 |
150m |
|
Power consumption |
1.5W |
Application Scenarios
Use QSFP-40G-SR4 when the Cisco QSFP 40G port is cabled through an MPO or MTP multimode plant and the link budget fits the documented OM2, OM3, OM4, or OM5 reach class.
This module is useful when a 40G QSFP port must break out through an external 12-fiber parallel-to-duplex cable toward four 10GBASE-SR interfaces. The breakout plan should be tied to Cisco platform support instead of assumed from the connector alone.
Keep QSFP-40G-SR4 separate from BiDi, CSR4, LR4, and S-Class SR4 optics in receiving and spare pools. The order line should preserve the non-S SR4 part number when the design depends on breakout behavior.
Product Comparison
|
Parameter |
QSFP-40G-SR4 | ||
|---|---|---|---|
|
Product type |
40GBASE-SR4 QSFP transceiver |
40GBASE-CSR4 QSFP transceiver |
40GBASE-SR-BiDi QSFP transceiver |
|
Connector type |
MPO-12 |
MPO-12 |
Duplex LC |
|
Fiber type |
Multimode fiber |
Multimode fiber |
Multimode fiber |
|
Optical lane design |
Four 10G lanes |
Four 10G lanes |
Two 20G BiDi channels |
|
Wavelength profile |
850 nm |
850 nm |
832 to 918 nm |
|
Reach on OM3 |
100m |
300m |
100m |
|
Reach on OM4 or OM5 |
150m |
400m |
150m |
|
4x10G breakout support |
Supported with external parallel-to-duplex breakout cable |
Supported with parallel-to-duplex breakout cable |
Not an SR4 breakout optic |
|
Power consumption |
1.5W |
1.5W |
3.5W |
|
Pull tab color |
Beige |
Beige |
Gray |
- In a QSFP-40G-SR4 vs QSFP-40G-SR4-S comparison, the key difference is 4x10G breakout support; Cisco points breakout applications to QSFP-40G-SR4 or QSFP-40G-CSR4 rather than the S-Class SR4 part.
- The QSFP-40G-SR4 difference from QSFP-40G-CSR4 is reach, because CSR4 extends the SR4 interface to 300m on OM3 and 400m on OM4 or OM5 while staying on MPO or MTP parallel MMF.
- QSFP-40G-SR4 vs QSFP-40G-SR-BD is a connector and fiber-count comparison: SR4 uses MPO-12 parallel MMF, while SR-BD uses duplex LC multimode fiber.
- For which model to choose, match the Cisco SKU to the required connector type, multimode fiber distance, breakout requirement, and Cisco host compatibility.
Selection Guide
1. Choose it for short SR4 MPO cabling
Select QSFP-40G-SR4 when the physical design uses Cisco 40G QSFP ports with MPO or MTP multimode cabling and the run length is within the Cisco SR4 distance table.
2. Preserve this SKU for 4x10G breakout plans
Choose the non-S SR4 part when the bill of materials requires a Cisco-documented 40G-to-4x10G optical breakout path through a parallel-to-duplex fiber assembly.
3. Move to CSR4 for longer parallel MMF runs
Use QSFP-40G-CSR4 instead when the official design needs the longer 300m OM3 or 400m OM4 or OM5 reach while remaining in the SR4 parallel-fiber family.
4. Use BiDi only for duplex LC migration
Choose QSFP-40G-SR-BD only when the cabling plan is based on two-strand LC multimode fiber rather than an MPO-12 SR4 trunk.
Ordering Checklist
|
Check Item |
What to Confirm |
Procurement Risk Controlled |
|---|---|---|
|
Cisco host support |
Target switch, router, module, QSFP 40G port, and software support in Cisco compatibility documentation |
Keeps the optic tied to a Cisco-supported device and release |
|
Link mode |
Native 40G SR4 or 4x10G breakout mode |
Prevents ordering the S-Class SR4 part for a breakout requirement |
|
Fiber connector |
12-fiber MPO or MTP multifiber connector |
Avoids mixing the order with LC BiDi or LC CSR-S optics |
|
Fiber grade and reach |
OM2 to 30m, OM3 to 100m, or OM4 and OM5 to 150m |
Aligns the optic with Cisco’s cabling table |
|
Breakout assembly |
External 12-fiber parallel-to-duplex breakout cable for four 10GBASE-SR endpoints |
Separates optical breakout cabling from direct 40G SR4 patching |
|
Operating environment |
0 to 70 degrees C commercial temperature range and 1.5W module power |
Checks thermal and power assumptions before approval |
Specifications
| Parameter | Specification | Parameter | Specification |
|---|---|---|---|
| Product ID | QSFP-40G-SR4 | Product type | 40GBASE-SR4 QSFP optical transceiver |
| Ordering description | 40GBASE-SR4 QSFP+ transceiver module for MMF | Form factor | QSFP |
| Host interface | Cisco QSFP 40G port | Ethernet rate | 40 Gigabit Ethernet |
| Connector type | MPO-12 | Fiber type | Multimode fiber |
| Optical lane design | Four 10G lanes | Wavelength | 850 nm |
| 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 |
| Breakout mode | 4x10G mode with external 12-fiber parallel-to-duplex breakout cable | Compatible 10G interface class | 10GBASE-SR and SFP-10/25G-CSR-S in 10G mode |
| Power consumption | 1.5W | Pull tab color | Beige |
| Operating temperature range | 0 to 70 degrees C | Storage temperature range | -40 to 85 degrees C |
| QSFP module dimensions | 13.5 x 18.4 x 72.4 mm maximum outer dimensions | QSFP module weight | 100 grams or less |
| Compatibility reference | Cisco Optics-to-Device Compatibility Matrix | IEEE relationship | Interoperable with IEEE 40GBASE-SR4 interfaces where applicable |
Get More Information
Need pricing, stock, or shipping details for the QSFP-40G-SR4 ? Layer23-Switch can help you check current availability, lead time, and delivery options for this. Send us the part number, quantity, and destination country via live chat or email sales@layer23-switch.com for a fast quotation.
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Questions & Answers
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What is Cisco QSFP-40G-SR4 used for?
-
How far can QSFP-40G-SR4 reach?
-
What connector does QSFP-40G-SR4 use?
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Can QSFP-40G-SR4 break out to 4x10G?
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How is QSFP-40G-SR4 different from QSFP-40G-SR4-S?
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Is QSFP-40G-SR4 compatible with 10G SR optics?
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When should I choose QSFP-40G-SR-BD instead?
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When is QSFP-40G-SR4 the wrong SKU?
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