QSFP28 (100G)
A QSFP28 is a Quad (4-channel) small form factor hot pluggable fibre optical transceiver used for 100 Gigabit Ethernet (100GbE) data communications applications.
The QSFP28 integrates 4 transmit and 4 receiver channels. The number 28 means each lane carries up to 28G data rate. QSFP28 supports 4x25G breakout connection, 2x50G breakout, or 1x100G depending on the type of QSFP28 transceiver used.
QSFP28 transceivers include SR4, LR4, IR4 PSM, CWDM4 and BiDi series.
Compliant with the following Standards and Protocols:
- IEEE 802.3bm
- SFF 8661 (QSFP+ 4X Module Specification)
- SFF 8672 (4X 28Gb/s Connector)
- SFF 8679 (QSFP+ 4X Hardware and Electrical Specification)
- SFF 8665 ( QSFP+ 4X 28 Gb/s Pluggable Transceiver Solution)
Below we detail the several options available when choosing your QSFP28 transceiver module.
Multimode Transmission
| Type | Connector | Max Distance | Transmitter | Max Power | Standards |
| MPO/MTP | 100m | VCSEL | 4w | IEEE 802.3bm |
Singlemode Serial Transmission
| Type | Connector | Max Distance | Transmitter | Max Power | Standards |
| LC Duplex | 10km | 4 x CWDM | 3.6w | 100G CWDM4 | |
| 100G LR4 | LC Duplex | 10km | 4 x LAN WDM | 3.6w | IEEE 802.3ba |
| 100G ER4 | LC Duplex | 40km | 4 x LAN WDM EML | 3.6w | 100G 4 WDM-40 Rev 1 |
Singlemode Parallel Transmission
| Type | Connector | Max Distance | Transmitter | Max Power | Standards |
| MPO | 2km | DFB | 3.46v | IEEE 802.3bm, 100G PSM4 Rev 2 |
Detailed features by Technology
100G over Multimode Transmission
100GBASE-SR4
- Transmits over multimode (OM3 or OM4) at 850nm
- Supports a distance of up to 70m, over OM3 and 100m over OM4
- Transmits 4 x 25G channels using 8 fibre cores (4 duplex pairs) to with a total data rate of 100Gbps
- Each 25G channel can be connected to a different switch enabling one 100G port to connect to up to 4 other 25G ports
- MTP/MPO optical connector
- Single 3.3V Power Supply
- Maximum power consumption 4W
- Hot-Pluggable
- Commercial Temperature Range 0~70°C
100G over Singlemode Serial Transmission
100GBASE-CWDM4, LR4, ER4
- Transmits over singlemode LC Duplex at 1310nm (excl BiDi)
- Supports distances of between 2km and 40km, depending on transceiver type
- Capable of transmitting 100G over two fibres
- Four separate wavelengths are simultaneously transmitted to carry four 25G lanes of data
- LC Duplex optical connector
- Single 3.3V Power Supply
- Maximum power consumption 3.6W
- Hot-Pluggable
- Commercial Temperature Range 0~70
100G over Singlemode Parallel Transmission
100GBASE-PSM4
- Transmits over singlemode MPO connector at 1310nm
- Supports distances of up to 2km depending on transceiver type
- Transmits 100G over 8 fibres with each of the four independent lanes 25G using two fibres
- the 100G port can be connected to four 25G ports using a fibre breakout cable
- MPO optical connector
- Single 3.3V Power Supply
- Maximum power consumption 3.46W
- Hot-Pluggable
- Commercial Temperature Range 0~70
