100G QSFP28 to 4x 25G SFP28 Breakout Active Optical Cables
Features
SFF-8436 compliant QSFP28 connector
4x SFF-8431 compliant SFP28 connectors
Hot-pluggable electrical interface
850nm VCSEL transmitter
PIN photo-detector receiver
Internal CDR circuits on both receiver and transmitter channels
Low power consumption < 2.5W (QSFP28) < 1W (SFP28)
Length up to 70m using OM3 MMF and 100m using OM4 MMF
Operating case temperature range 0°C to +70°C
All-metal housing for superior EMI performance
RoHS-6 compliant (lead free)
Application
IEEE 802.3bm 100GBASE-SR4
IEEE 802.3by 25GBASE-SR
InfiniBand SDR/DDR/QDR
High-Performance Computing (HPC) clusters
Servers, switches, storage and host card adapters
Description
The Gigalight 100G QSFP28 to 4x 25G SFP28 breakout Active Optical Cables (AOCs) offer IT professionals a cost-effective interconnect solution for merging 100G QSFP28 and 25G SFP28 enabled host adapters, switches and servers. For typical applications, users can install this breakout or splitter cable between an available QSFP28 port on 100GE switch and feed up to 4 upstream SFP28 enabled 25GE switches. Each cable features a single SFF-8436 compliant QSFP28 connector rated for 103Gb/s on one end and 4 SFF-8431 complicant SFP28 connectors rated for 25.78Gb/s each on the other end.
QSFP28 interface Specifications
| Module Form Factor | QSFP28 (Supports SFF8436) |
| Channel Data Rate | 25.78125Gbps |
| BER | <10-12 |
| Operating Case Temperature | 0 to + 70ºC |
| Storage Temperature | -20 to + 85ºC |
| Supply Voltage | 3.3V |
| Supply current | Typical 560mA |
| Management Interface Serial | I2C (Supports SFF8436) |
Optical Characteristics The following optical characteristics are defined over the Recommended Operating Environment unless otherwise specified.
| Parameter | Symbol | Min. | Typical | Max | Unit |
| Transmitter | |||||
| Center Wavelength | λt | 840 | 850 | 860 | nm |
| RMS spectral width | ∆λ | 0.65 | nm | ||
| Average launch power, each lane | Pout | -7.6 | - | 2.4 | dBm |
| Difference in launch power between any two lanes (OMA) |
- | - | - | 4 | dBm |
| Extinction Ratio | ER | 3 | - | - | dB |
| Peak power, each lane | - | - | - | 4 | dB |
| Transmitter and dispersion penalty (TDP), each lane | TDP | - | - | 3.5 | dB |
| Receiver | |||||
| Center Wavelength | λr | 840 | 850 | 860 | nm |
| Stressed receiver sensitivity in OMA, each lane | - | - | -5.4 | dBm | |
| Maximum Average power at receiver input, each lane | - | - | 2.4 | dBm | |
| Receiver Reflectance | -12 | dBm | |||
| Peak power, each lane | - | 4 | dBm | ||
| LOS Assert | -30 | - | dBm | ||
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