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25G/100G Ethernet Solutions for Campus Networks

Updated on Jun 24, 2022
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Most current campus networks use 10G/40G Ethernet solutions where the link bandwidth is typically 10G between the access layer and the distribution layer, and 40G between the distribution layer and the core layer. However, the ever-increasing traffic growth from video streaming, artificial intelligence (AI), and cloud applications is driving the need for faster and higher-capacity campus network solutions. That's why 25G/100G Ethernet solution is gaining momentum.

What is 25G/100G Ethernet Solution?

Unlike 10G/40G Ethernet solution, 25G/100G upgrade solutions drive campus networks towards higher performance and scalability. In a 25G/100G campus network, the uplink bandwidth is typically 25G from the access layer to the distribution layer, and 100G from the distribution layer to the core layer.

Ever since the IEEE 25G standard was released back in 2015, the 25G/100G Ethernet solution has grown increasingly popular as an optimal campus network solution due to various advantages it offers. Early reports have also shown that 25G/100G Ethernet solutions have a promising future in data center networks.

25G/100G Ethernet Solution

Key Benefits of 25G/100G Solution

25G/100G Ethernet solutions come with a wide range of benefits such as high density and flexibility. Let's dig deeper into how 25G/100G Ethernet solutions bring out the best of campus networks.

Improved Network Bandwidth

In a 25G/100G Ethernet solution, the data link bandwidth between the access layer and the distribution layer is upgraded from 10G to 25G, and the data link bandwidth between the distribution layer and the core layer is upgraded from 40G to 100G. Compared to 10G/40G Ethernet solutions, this means an increase of bandwidth by 2.5 times both between the access layer and the distribution layer and between the distribution layer and the core layer.

Good Compatibility with Transceiver Modules

25G SFP28 ports are compatible with existing 10G SFP+ transceiver modules because 25G SFP28 transceiver modules and 10G SFP+ transceiver modules have the same form factor. To put it simply, 25G SFP28 ports support 10G SFP+ transceiver modules, and thus support a rate of 10 Gbps.

Likewise, 100G SFP28 transceiver modules and 40G SFP+ transceiver modules have the same form factor.100G QSFP28 ports are compatible with existing 40G QSFP+ transceiver modules, thus supporting a data rate of 40 Gbps.

Optical Fiber Reuse

If a 10G/40G campus network needs an upgrade to 25G/100G, the optical fibers used on the previous network can still be used for the new 25G/100G solution. This is because 25G SFP28 transceiver modules, be they single-mode or multi-mode, use LC connectors like 10G SFP+ transceiver modules. And 100G QSFP28 transceiver modules support MPO or LC connectors as 40G QSFP+ transceiver modules do.

As long as the existing optical fibers can support the maximum transmission distance required, this reuse not only reduces the cost of purchasing new optical fibers but also saves you the trouble of redesigning your cabling architecture for the network upgrade.

Reduced Power Consumption

The 25G/100G Ethernet solution can remarkably bring power consumption per unit bandwidth down. Take FS transceiver modules with a maximum reach of 10 km as an example. Other parameters being equal (media, transmitter and receive type), compared to FS 10G SFP+ SMF transceiver modules, FS 25G SFP28 SMF transceiver modules improve network bandwidth by 1.5 times without any increase in maximum power consumption. The same thing goes to 100G SFP28 transceiver modules. Thus, the power consumption per unit bandwidth in the 25G/100G Ethernet solution is reduced significantly.

Key Technologies in 25G/100G Solution

The high performance of the 25G/100G Ethernet solution is not possible without a number of cutting edge technologies. The following shows some key technologies used in 25G/100G Ethernet solutions.

SerDes

A SerDes, short for serializer/deserializer, is a pair of functional blocks able to convert parallel data to serial data, or vice versa. The serializer, also called SerDes sender (TX), serializes and transmits the received data to the deserializer at the other end. The deserializer, or SerDes receiver (Rx), reconstructs the serialized data. The primary purpose of SerDes is to minimize the number of I/O pins and interconnects and speed up data communication.

SerDes

Thanks to SerDes, 25G SFP28 transceiver modules can support a data rate of 25Gbps on a single channel, and 100G QSFP28 transceiver modules can make a data rate of 100Gbps possible with four SerDes channels supporting 25 Gbps. This technology is also the reason why a breakout cable can be used to connect one 100G QSFP28 port to four 25G SFP28 ports.

FEC

FEC (Forward Error Correction) refers to a method of error control in data transmission where the transmitter adds error correction information to received data message and the receiver recognizes part of the data without the error correction information. This technology helps lower the Bit Error Rate (BER) in the data transmission process, thus improving the overall signal quality. However, FEC also comes with its fair share of limitations such as data redundancy and transmission latency.

FEC

PAM4

PAM4, short for 4-level pulse amplitude modulation, is a multilevel signal modulation method used in high-speed signal interconnection. Unlike NRZ, PAM4 uses four different signal levels,namely 00, 01, 10, and 11, to transmit data, each level cycle transmitting 2-bit logic information.

Used on transceiver modules, this technology makes it possible to increase bandwidth and improve performance without having to configure more fibers. In addition, lag is not likely to occur as transmission rate grows, enabling high-performance 25G/100G networks.

Voltage levels of NRZ and PAM4

FS 25G/100G Products for Campus Networks

FS provides a complete portfolio of 25G/100G products to help you upgrade to 25G/100G network solutions. Here is a list of high-performance 25G/100G switches and transceiver modules for your campus networks.

  category Products Features
25G Switch 25G Enterprise Switches
  • 10G/25G/40G ports for flexible deployment in multiple scenarios

  • Dual redundant power supplies and smart fans

25G Data Center Switches
  • Flexible 10/25/40/100GbE interface speeds, support stacking

  • Low-latency, zero packet loss with PFC, ECN, RDMA over Converged Ethernet (RoCE)

Transceiver Module 25G SFP28
  • Tested in targeted switch for superior performance, quality, and reliability

  • High-speed connectivity compliant to IEEE 802.3by and IEEE 802.3cc

25G BiDi SFP28
  • Double your bandwidth by using only one fiber for transmit and receive

  • High-speed connectivity compliant to IEEE 802.3cc

25G WDM SFP28
  • CWDM for multiple applications over one duplex fiber

  • Digital optical monitoring capability for strong diagnostic capabilities

DAC & AOC 25G SFP28 DAC
  • Minimum bend radius 30mm for flexible routing

  • Simplifies patching and offers a cost-effective way for short links

25G SFP28 AOC
  • Minimum bend radius 7.5mm for flexible routing

  • Simplifies patching and offers a cost-effective way for short links

100G Switch 100G Enterprise Switches
  • Flexible 1G/10G/25G/40G/100G ports to meet the needs of high-density deployment

  • Support QoS, BGP, IS-IS, VRRP, BFD, OSPF, etc.

100G Data Center Switches
  • Flexible 1G/10G/25G/40G/100G ports to meet the needs of high-density deployment

  • Support MLAG, BGP4/BGP4+, EVPN-VXLAN, REUP, GR, BFD

Transceiver Module 100G QSFP28
  • High-speed electrical interface compliant to IEEE 802.3bm

  • Adopt BOX Packaging, with great reliability, airtightness, and heat dissipation performance

100G CFP/CFP2/CFP4
  • Fully compatible with 200+ vendors

  • Hot-pluggable CFP MSA compliant

DAC & AOC 100G QSFP28 DAC/AOC
  • Minimum bend radius 33mm for flexible routing

  • Simplifies patching and offers a cost-effective way for short links

100G Breakout DAC/AOC
  • Support 100G to 2x 50G/4x 25G Ethernet interoperability

  • Simplifies patching and offers a cost-effective way for short links

With high bandwidth, low power consumption, and high density, the 25G/100G Ethernet solution is driving campus networks to a new level. Its values have been recognized by more and more enterprises and universities.

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