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PSM4 and CWDM4 in Data Center 100G Ethernet

PSM4 and CWDM4 in Data Center 100G Ethernet

QSFP28 is considered as the main form factor for 100G Ethernet in data center. And in order to satisfy different applications, various of 100G interfaces are developed. 100GBASE-PSM4 and 100GBASE-CWDM4 are two non-IEEE defined interface among them which are expected to be an alternative for data center 100G Ethernet. Today, I’d like to talk something about them. Why We Need PSM4 and CWDM4? As we know, the most basic 100G interfaces used today are 100GBASE-SR4 and 100GBASE-LR4 which are defined…

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What Is The Difference Between Singlemode SFP and Multimode SFP

What Is The Difference Between Singlemode SFP and Multimode SFP

The singlemode SFP and multimode SFP here mean the SFP transceivers which work at different types of optical fibers, ie simglemode SFP will work with singlemode fiber, while multimode SFP will work with multimode fiber. So, what’s the different between them? And what should we notice when using them. Today, we are going to have a discussion around this topic. Singlemode SFP vs Multimode SFP Singlemode SFP Singlemode fiber (SMF) has much tighter tolerances for optics used. The core is…

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What’s the Difference Between 100G CLR4 and CWDM4?

What’s the Difference Between 100G CLR4 and CWDM4?

Since the existing 100G Ethernet links with QSFP28 SR4 or LR4 are either too short or too expensive, 100G modules that can cover this enormous middle ground between 100m and 10km are expected to come to the market. 100G CLR4 and CWDM4 are two types of 100G interface to deliver distance up to 2km over duplex single-mode fiber. As CLR4 and CWDM4 are similar, so what’s the difference between them? CLR4 Alliance 100G CLR4 is a new, open, multi-vendor 100G…

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Fiber Cost Comparison Between Using Parallel and Duplex Transceivers in 40GbE MMF Link

Fiber Cost Comparison Between Using Parallel and Duplex Transceivers in 40GbE MMF Link

There two ways to deploy 40GbE multimode fiber (MMF) infrastructure. One is using the parallel transceivers with 12-fiber MTP cables. And the other one is to use the duplex transceivers with LC duplex cables. The former solution requires to add additional fiber to increase the number of 40GbE links. Thus, more fiber cost is taken in this solution. Conversely, the duplex transceiver solution allows for zero-cost fiber migration by reusing the current 10GbE fiber infrastructure for 40GbE connectivity. In this…

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Considerations of Planning a Pre-terminated Cabling Infrastructure

Considerations of Planning a Pre-terminated Cabling Infrastructure

Pre-terminated cable assemblies including various trunk cables, patch cords, and plug-and-play cassettes provide a plug-and-play, time-saving and easy-to-deploy solution for links between switches, servers, patch panels and ZDA (Zone Distribution Areas) in a data center. However, compared to field-terminated cabling, pre-terminated cabling need more additional upfront planning and detailed analysis in order to establish the cabling and termination routes and lengths needed. Thus, some key considerations should be remembered when planning a pre-terminated cabling infrastructure. Architecture & Configuration Common network…

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40G QSFP+ Breakout Cables vs. QSA Module

40G QSFP+ Breakout Cables vs. QSA Module

When one end of the network is running on a 40 Gigabit platform, and the other end of the network is running at lower speeds such as 10 Gbps, migration is required. Using fan-out technology and QSA are two different methods to achieve the migration between 40 Gigabit Ethernet and 10 Gigabit Ethernet. But which is better? Expands the 40G Data Pipe into 4x10G Lanes With Breakout Cables 40G QSFP+ to 4×10 SFP+ breakout cables including direct attach copper cable…

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Is It Possible to Transmit 1310nm/1550nm Over MMF or 850nm Over SMF?

Is It Possible to Transmit 1310nm/1550nm Over MMF or 850nm Over SMF?

In the previous post “What is the difference between single-mode SFP and multimode SFP“, I have mentioned these two points: “Single-mode SFPs (SMF SFPs) work mainly in 1310nm and 1550nm wavelength and is mostly used in long distances transmission environment reaching 2km, 10km, 40km, 60km, 80km and 120km.” “Common multimode SFPs (MMF SFPs) work in 850nm wavelength and is only used for short distance transmission reaching 100m and 500m.” Indeed, we always like to associate multimode fiber with 850nm and…

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Transceiver Options for Running 40GbE Over Duplex LC MMF Cable

Transceiver Options for Running 40GbE Over Duplex LC MMF Cable

The use of parallel optics in 40GbE multimode fiber (MMF) cabling require more fiber strands than the 10GbE infrastructures. Thus, data center will require a cabling upgrade to meet the requirement of migration. In this case, cost is a big factor. To help user solve the fiber cost issue, many vendors developed a new transceiver alternative that allow zero-cost fiber migration by reusing the current 10Gbps multimode fiber-optic cabling plant for 40Gbps connectivity. This post will introduce three mainstream transceiver…

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Media Types for 10 Gigabit Ethernet

Media Types for 10 Gigabit Ethernet

Today, the Ethernet cabling systems market is dominated by 10G links. Several physical media types are available to support 10 Gigabit Ethernet applications, including 10GBASE-CX4, SFP+ DAC, fiber optics, and 10GBASE-T (using twisted pair, RJ-45 connectors). In this post, they are introduced one by one. 10GBASE-CX4 CX4 is the first 10G copper standard published by 802.3 (as 802.3ak-2004). It offers the advantages of low power, low cost and low latency and is specified to work up to a distance of…

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Things Should Be Considered When Buying Direct Attach Copper Cables

Things Should Be Considered When Buying Direct Attach Copper Cables

Direct attach copper cables, namely DAC cables, are a form of optical transceiver assemblies used to connect switches to routers and/or servers. They are becoming increasingly popular in the network industry, mainly because the price difference is so large when compared with regular optics. There are various versions of DACs with different specifications on the market today which make us in difficult choices. So, what should be considered when we buy DAC cables? Just keep reading, you may find the…

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Differences Between Phone & Network Cable

Differences Between Phone & Network Cable

When connecting the computer to the network devices like switches and routers, you must use a network cable, namely an Ethernet patch cable. A regular phone cable will not work, even though it looks similar to a network cable. There are some differences between phone cable and network cable, including: Network cables are usually thicker and rounder than a telephone cable. Network cables, including Cat5, Cat5e, Cat6, Cat6a, etc., are twisted pair cables for carrying signals in structured cabling for…

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