How to select the right optical transceiver for a 40G data center switch?
2019-09-11
Optical module and switch are indispensable equipment in the network construction of data center. One question is, how should we choose the appropriate optical module in the 40G data center switch? According to different transmission protocols, the 40G QSFP+ optical module can be divided into40GBASE-ER4、40GBASE-PSM4、40GBASE-BiDi、40GBASE-SR4、40GBASE-eSR4、40GBASE-LR4etc.
Data center switches are growing rapidly and are no longer a monopoly dominated by a few hardware-based vendors. For network engineers who deploy, manage, and purchase switches, this has dramatically changed their thinking and procurement decisions, but not everything. Hardware plays an important role in evaluating price, bandwidth, etc., and fancy software functions are important. But the focus is not just on speed and capacity.
Many network providers, especially the new ones emerging in the market, have embraced commercial chips rather than relying on architectures built around custom asics. At the same time, many vendors differentiate between their data center switches, relying primarily on software, a pis, and architectures. This indicates that commodity hardware as the basis of the network ecosystem indicates the rise of bare-metal and white box switches. Most of all, we need to really solve the problem of highly virtualized data centers, which are compatible with third-party platforms, namely cloud architecture, hypervisor, and security .It needs to be well supported by vendors, and it needs to be easy to operate. Because this is a new technology, it takes practice. In recent years, some of the core switches made by some manufacturers have code holes. At the end of the day, companies need to explain to the public how fabrics and SND should coexist in a data center. A lot of people have started to do this, and there will be more discussions in the future, especially since the real potential of SDN is still very much unknown. The application of 40G network in large data centers is very common. Fiber optic module is one of the interconnection conditions of switches in data centers. QSFP+ optical module can meet the requirements of high-density and high-rate pluggable solutions. Now, I will give you the classification and interface type of 40G optical module.
40G QSFP+ ER4 fiber transceiver
The optical module is MPO/LC duplex optical fiber connector, which adopts four-channel single-mode transmission with the maximum transmission distance up to 40km, and is applied in 40G network transmission.
40G LR4 PSM fiber transceiver
The optical module adopts MPO/LC duplex optical fiber connector, whose working principle is similar to that of the 40G SR4 QSFP+ optical module with different points. The optical signals transmitted in parallel by the latter are transmitted in parallel through 8 single-mode optical fibers, with the maximum transmission distance up to 2km.
40G QSFP+ LR4 fiber transceiver
40G QSFP+ LR4 optical module has the advantages of high density, high rate, large capacity, low cost and low power consumption. MPO/LC duplex optical connector is adopted. It works by modulating the wavelength of serial data with a laser driver, The multiplexer combines the modulated optical signals for transmission. As soon as they reach the receiving end, these transmitted signals are decomposed into four channels with transmission rate of 10Gbps under the action of the de multi plexer, and then PIN detector or mutual impedance amplifier pairs the data.The stream is restored, and the light signal is finally sent out over a distance of 10km.
40GBASE-SR4 fiber transceiver
The 40gbase-sr4 optical module is an optical module with a working wavelength of 850nm, which adopts MPO/MTP connector. Generally, it is used together with multi-mode fiber. When it is used together with OM3 fiber jumper, its transmission distance is 100m; when it is used together with OM4 fiber jumper, its transmission distance is 150m.
40GBASE-BiDi fiber transceiver
The optical module is an optical module with a working wavelength of 850nm/900nm, which adopts LC duplex connector and has a maximum transmission distance of 150m when used together with multi-mode fiber jumper.
40GBASE-eSR4 fiber transceiver
The optical module is an optical module with a working wavelength of 850nm, which adopts LC duplex connector. It is usually used together with multi-mode optical fiber. When used together with OM3 optical fiber jumper, its transmission distance is 300m.
When used with OM4 fiber jumper, its transmission distance is 400m.
40GBASE-PSM4 fiber transceiver
The optical module is an optical module with a working wavelength of 1310nm, which adopts MPO/MTP connector or LC duplex connector, and is used together with single-mode fiber, with the maximum transmission distance of 2km.
I chose the Mikrotik data center switches over the cisco data center switches because their data center switches seem to have more reliable performance parameters and can afford rack access to the data center switches at a very low price. Test it first before expanding to a production data center. Your choice is based on the risk factor you are willing to accept. So with these variables in mind, network data center switch purchases are very fragmented. Some network professionals consider Mikrotik data center switches "too amateur" to be used on data center switches, even if the performance parameters look very competitive. Mikrotik users claim to be "stable in carrying out common tasks," for non-critical applications such as user-ordered device and maximum transport unit deployments, and VPN access points. Several Mik rotik data center switch users noted that the switch's middleware update quality was not up to par for mission-critical computing. Datacenter switch managers still choose market-tested datacenter switches from big brands because the cost is high if the datacenter switch goes down. Mission-critical application dependencies include enterprise resource planning, customer relationship management, and supply chain management catalogs. Consider configuring an administrative data center switch for an enterprise's virtual private network, an access data center switch to a back-end mail system, or an edge data center switch between two lans, or a connection data center switch between public and private clouds. Firstly, it meets the requirement of application back-end server access level reliability. Then focus on performance, functionality, cost, vendor support, and other factors.
Data center switches are growing rapidly and are no longer a monopoly dominated by a few hardware-based vendors. For network engineers who deploy, manage, and purchase switches, this has dramatically changed their thinking and procurement decisions, but not everything. Hardware plays an important role in evaluating price, bandwidth, etc., and fancy software functions are important. But the focus is not just on speed and capacity.
Many network providers, especially the new ones emerging in the market, have embraced commercial chips rather than relying on architectures built around custom asics. At the same time, many vendors differentiate between their data center switches, relying primarily on software, a pis, and architectures. This indicates that commodity hardware as the basis of the network ecosystem indicates the rise of bare-metal and white box switches. Most of all, we need to really solve the problem of highly virtualized data centers, which are compatible with third-party platforms, namely cloud architecture, hypervisor, and security .It needs to be well supported by vendors, and it needs to be easy to operate. Because this is a new technology, it takes practice. In recent years, some of the core switches made by some manufacturers have code holes. At the end of the day, companies need to explain to the public how fabrics and SND should coexist in a data center. A lot of people have started to do this, and there will be more discussions in the future, especially since the real potential of SDN is still very much unknown. The application of 40G network in large data centers is very common. Fiber optic module is one of the interconnection conditions of switches in data centers. QSFP+ optical module can meet the requirements of high-density and high-rate pluggable solutions. Now, I will give you the classification and interface type of 40G optical module.
40G QSFP+ ER4 fiber transceiver
The optical module is MPO/LC duplex optical fiber connector, which adopts four-channel single-mode transmission with the maximum transmission distance up to 40km, and is applied in 40G network transmission.
40G LR4 PSM fiber transceiver
The optical module adopts MPO/LC duplex optical fiber connector, whose working principle is similar to that of the 40G SR4 QSFP+ optical module with different points. The optical signals transmitted in parallel by the latter are transmitted in parallel through 8 single-mode optical fibers, with the maximum transmission distance up to 2km.
40G QSFP+ LR4 fiber transceiver
40G QSFP+ LR4 optical module has the advantages of high density, high rate, large capacity, low cost and low power consumption. MPO/LC duplex optical connector is adopted. It works by modulating the wavelength of serial data with a laser driver, The multiplexer combines the modulated optical signals for transmission. As soon as they reach the receiving end, these transmitted signals are decomposed into four channels with transmission rate of 10Gbps under the action of the de multi plexer, and then PIN detector or mutual impedance amplifier pairs the data.The stream is restored, and the light signal is finally sent out over a distance of 10km.
40GBASE-SR4 fiber transceiver
The 40gbase-sr4 optical module is an optical module with a working wavelength of 850nm, which adopts MPO/MTP connector. Generally, it is used together with multi-mode fiber. When it is used together with OM3 fiber jumper, its transmission distance is 100m; when it is used together with OM4 fiber jumper, its transmission distance is 150m.
40GBASE-BiDi fiber transceiver
The optical module is an optical module with a working wavelength of 850nm/900nm, which adopts LC duplex connector and has a maximum transmission distance of 150m when used together with multi-mode fiber jumper.
40GBASE-eSR4 fiber transceiver
The optical module is an optical module with a working wavelength of 850nm, which adopts LC duplex connector. It is usually used together with multi-mode optical fiber. When used together with OM3 optical fiber jumper, its transmission distance is 300m.
When used with OM4 fiber jumper, its transmission distance is 400m.
40GBASE-PSM4 fiber transceiver
The optical module is an optical module with a working wavelength of 1310nm, which adopts MPO/MTP connector or LC duplex connector, and is used together with single-mode fiber, with the maximum transmission distance of 2km.
I chose the Mikrotik data center switches over the cisco data center switches because their data center switches seem to have more reliable performance parameters and can afford rack access to the data center switches at a very low price. Test it first before expanding to a production data center. Your choice is based on the risk factor you are willing to accept. So with these variables in mind, network data center switch purchases are very fragmented. Some network professionals consider Mikrotik data center switches "too amateur" to be used on data center switches, even if the performance parameters look very competitive. Mikrotik users claim to be "stable in carrying out common tasks," for non-critical applications such as user-ordered device and maximum transport unit deployments, and VPN access points. Several Mik rotik data center switch users noted that the switch's middleware update quality was not up to par for mission-critical computing. Datacenter switch managers still choose market-tested datacenter switches from big brands because the cost is high if the datacenter switch goes down. Mission-critical application dependencies include enterprise resource planning, customer relationship management, and supply chain management catalogs. Consider configuring an administrative data center switch for an enterprise's virtual private network, an access data center switch to a back-end mail system, or an edge data center switch between two lans, or a connection data center switch between public and private clouds. Firstly, it meets the requirement of application back-end server access level reliability. Then focus on performance, functionality, cost, vendor support, and other factors.
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