40GBASE-SR4/CSR4 QSFP+ Transceiver Direct Connection Cabling

As we all know, the standard specifies MPO as a connector to the 40GBASE-SR4/CSR4 QSFP+ transceiver. To connect a QSFP+ to QSFP+, we usually use a MTP 12-fiber trunk cable. In the 40GBASE-SR transmission, there are eight fibers associated with the channel—four fibers for the TX signal and four fibers for the RX signal. Therefore only 8 of the 12 fibers are used, where the remaining four are not used, and can optionally be not present in the cable. So we can also choose a MTP 8-fiber trunk cable for connectivity. This article explains 40GBASE-SR4/CSR4 QSFP+ to 40GBASE-SR4/CSR4 QSFP+ cabling selections.
How to Choose Right  MTP Trunk Cables?
In addition to using a MTP 8-fiber trunk cable or MTP 12-fiber trunk cable, there are a number of other factors also needed to be considered when to choose a right MTP trunk cable for 40GBASE-SR4/CSR4 QSFP+ connectivity.
  • Use single-mode or multimode MTP trunk cable?
In the market, both single-mode and multiode MTP trunk cable are available. Which one should I use? According to 40GBASE-SR4 standards, 40GBASE-SR4 QSFP+ transceiver supports link lengths of 100 meters and 150 meters, respectively, on laser-optimized OM3 and OM4 multimode fibers. Therefore, to connect a 40GBASE-SR4 QSFP+ to 40GBASE-SR4 QSFP+, we should choose OM3 or OM4 multimode MTP trunk cables.
  • MTP trunk cable polarity selection: A, B or C?
In terms of MTP trunk cable, there are three kinds of polarity options (A, B and C). Which one to choose? In fact, according to the IEEE 40GBASE-SR4 specifications, we must select a type B MTP 8-fiber or MTP 12-fiber trunk cable. The type B trunk cable has opposing connectors with both keys oriented facing up, however the fiber positions are reversed at each end i.e. the fiber at position 1 at one end is connected to position 12 in the connector at the opposing end.
  • Choose male or female MTP trunk cable?
In terms of a MPO connector, it is divided into male and female types. They ensure that the adapter holds the connector with the correct ends aligned with each other. A MPO trunk cable usually has two MPO connector on each side. Therefore, MTP trunk cables are available in male–male and female–female two versions. According to IEEE standards, MPO optics in a 40GBASE-SR4 transceiver are always male connectors, and therefore will always accept female MPO connectors. So if we want to connect a 40GBASE-SR4 QSFP+ to a 40GBASE-SR4 QSFP+ successfully, we must choose a female–female MTP trunk cable.
40GBASE-SR4/CSR4 QSFP+ to 40GBASE-SR4/CSR4 QSFP+ Cabling Selections
In order to satisfy different cabling requirement, we may choose different cabling methods. And different cabling methods call for many different cabling infrastructure. Following are four type common cabling methods to connect a 40GBASE-SR4/CSR4 QSFP+ to 40GBASE-SR4/CSR4 QSFP+.
  • Direct connection for 40 Gigabit Ethernet parallel optic transceiver
When directly connecting one QSFP+ MPO/MTP interface transceiver to another, a Type-B female MPO/MTP to female MPO/MTP cable is required. This type of direct connectivity is only suggested for short distances within a given row of racks/cabinets. Following picture shows two QSFP+ transceivers being connected with a MTP female cable.
Item NumberFS Correlative Product DescriptionFS Part Number
140GBASE-SR4 QSFP+, 850nm, 150m, MMF, MPO interfaceQSFP-SR4-40G
212 Fibers OM4, 12 Strands MTP Trunk Cable, Female to Female, Type B Polarity ( MTP/ MPO, OM4/ OM3 optional. Various lengths available)FS12OM4-2MTP-FF-B
  • 40GbE direct interconnect with MTP trunk cable and patch panel
For distances less than 400 meters, the use of FS MPO/MTP multi-mode fiber cabling is generally the preferred cabling method. The next solution is similar to the previous, but instead of using a 12-fiber jumper directly, the MPO/MTP adapter panel is interconnected. Following picture shows the distribution switch and FS optics and cabling options with corresponding item details for a QSFP+ to QSFP+ multi-mode interconnection.
Item NumberFS Correlative Product DescriptionFS Part Number
140GBASE-SR4 QSFP+, 850nm, 150m, MMF, MPO interfaceQSFP-SR4-40G
212 Fibers OM4, 12 Strands MTP Trunk Cable, Female to Female, Type B Polarity ( MTP/ MPO, OM4/ OM3 optional. Various lengths available)FS12OM4-2MTP-FF-B
312 Ports MTP/MPO Fiber Adapter Panel, key-up to key-upFAP-HV-12MTPUUD
  • 10Gig migrate to 40GbE by interconnecting MTP LGX cassette and MTP trunk cable
Following picture shows one link with a breakout of the QSFP+ with the use of an MPO/MTP LGX cassette to four 10G SFP+ links. A Type-B female MPO/MTP to Female MPO/MTP assembly is used between the MPO/MTP LGX cassette and 40GbE transceiver. The connections to the SFP+ transceivers is accomplished with OM3/OM4 Uniboot LC duplex fiber patch cables.
Item NumberFS Correlative Product DescriptionFS Part Number
110GBASE-SR SFP+, 850nm 300m, MMF, LC duplexSFP-10GSR-85
2LC-LC Duplex 10G OM4, MMF Patch CableOM4-LC-LC-DX-FS
312 Fibers OM4, LGX – MTP Cassette, MTP(male) to LCFS12OM4-LGX-2MTP-LC
4MTP/MPO LGX Cassettes 1U/4U 19” Rack MountFS-1RU-MX
512 Fibers OM4, 12 Strands MTP Trunk Cable, Female to Female, Type B Polarity ( MTP/ MPO, OM4/ OM3 optional. Various lengths available)FS12OM4-2MTP-FF-B
610GBASE-SR SFP+, 850nm 300m, MMF, LC duplexSFP-10GSR-85
  • 10Gig migrate to 40GbE by interconnecting MTP harness cable and MTP trunk cable
Sometimes, create a simple, cost-effective migration path by installing a structured cabling system that can support your future 40GbE networking needs. Following picture uses the 8-fiber harness as shown in the diagram to connect to 10G SFP+s. This approach allows for an easy upgrade path moving from 10Gig to 40GbE connectivity.
Item NumberFS Correlative Product DescriptionFS Part Number
110GBASE-SR SFP+, 850nm 300m, MMF, LC duplexSFP-10GSR-85
28 Fibers OM4, 12 Strands MTP Harness Cable, MTP to LC, Type B Polarity ( MTP/ MPO, OM4/ OM3 optional. Various lengths available)OM4-LC-LC-DX-FS
312 Ports MTP/MPO Fiber Adapter Panel, key-up to key-upFAP-HV-12MTPUUD
4Empty 1RU/4RU Rack Mount Fiber Patch PanelFMT1-E-FS
512 Fibers OM4, 12 Strands MTP Trunk Cable, Female to Female, Type B Polarity ( MTP/ MPO, OM4/ OM3 optional. Various lengths available)FS12OM4-2MTP-FF-B
640GBASE-SR4 QSFP+, 850nm, 150m, MMF, MPO interfaceQSFP-SR4-40G
Fiberstore provides wide brand compatible 40GBASE-SR4 QSFP+ transceivers and all kinds of MTP cables. Each fiber optic transceiver has been tested to ensure its compatibility and interoperability. Please rest assured to buy. For more information or quotation, please contact us via sales@fs.com.

评论

发表评论

此博客中的热门博文

What Is VLAN Switch and Why Do We Need It?

图片
VLAN or virtual LAN is a type of LAN that is defined to map workstations based on everything except for geographic location. It develops when the network has increased in size and complexity, and many companies require more access ports or a network design. Basically, it’s a networking technology which allows the network to be segmented logically without geographic restrictions. But how much do you know about VLAN switch? What Is  VLAN Switch? VLAN switch is built on the fiber optic switch  of LAN, which realizes the division and management of logical working group as a software. As defined in IEEE standard 802.1Q, VLAN switch can provide a way to transform one network into multiple broadcast domains. And each broadcast domain is usually matched with IP subnet boundaries, so that each subnet has its own VLAN. Therefore, users can obtain various wired LANs for different purposes that are co-existed physically, which means you don’t need to buy additional hardware or cabling at a la
阅读全文

Differentiate the 3 Technologies: Switch Stacking vs Cascading vs Clustering

图片
When we have more than one switches on hand we often seek to a better way in making use of them and managing them. There are mainly three technologies that we might use when we interconnect or combine several switches together, which are switch stacking, cascading and clustering. For many people that firstly get in touch with these terms, they can’t figure out the differences between them. Some discussions of the switch stacking versus switch clustering and switch stacking versus switch cascading have been put forward, but a comprehensive comparison between them has not been made. So this post is a discussion of switch stacking vs cascading vs clustering. Switch Stacking vs Cascading vs Clustering The comparison of switch stacking, cascading and clustering should be based on knowing the meaning of these technologies. So firstly we will see what switch stacking, cascading and cluster are. What Are Switch Stacking, Cascading and Clustering? Switch stack
阅读全文

Introduction of Patch Panel Types

图片
Patch panel, an unsung hero, is the most important cable management tool of the data center. When you want to connect a vast number of devices to a central server or other network hardware, there must be plenty of various cables, and you have to plan each thing out properly. It’s always smart to use a patch panel to help you manage the cables and keep your server room organized. However, patch panels are available in different ports and applied in various cables, like 24 port or 48 port patch panel, Cat5e or Cat6 patch panel. There are so many patch panel types on the market that make you confused. Usually, patch panels can be used in two systems, fiber  and  copper cabling systems. Therefore, patch panel types will fall into two main categories, fiber optic patch panel  and   Ethernet patch panel . Fiber  O ptic  P atch  P an el Fiber optic patch panel  is applied in distributing the single mode and multimode fibers to realize the connection, allocation  and  scheduling between t
阅读全文