What if the Gbps ports are in different chassis blades or completely different chassis switches? The result will be long assemblies, which will be difficult to manage in an organized way. For this reason, Solution 3 is expected to be the least desirable and so the least deployed method. Table 7. Three cabling solutions for Gbps connectivity. Solution No conversion. Uses traditional fiber MTP connectivity and ignores unused fiber. Simplicity and lowest link attenuation.
Conversion module. Converts two fiber links to three 8-fiber links through a conversion patch panel. Uses all backbone fiber and creates a clean, manageable patch panel with off-the-shelf components. Entails additional connectivity costs and attenuation associated with the conversion device. Conversion assembly. Converts two fiber links to three 8-fiber links through a conversion assembly and standard MTP patch panels.
Uses all backbone fiber with additional connectivity. Creates cabling challenges with dangling connectors and non-optimized-length patch cords that require customization.
Corning offers components to build all three solutions. However, Corning suggests implementation of the conversion module solution, especially if you are using previously installed MTP trunks. This solution allows percent fiber utilization while maintaining any port-to-any port patching. If you are installing all new cabling, then you could consider the no-conversion solution, assuming that the cable raceway is not a concern. Typically, the conversion harness is deployed only in specific applications, such as at the ToR switch, where Gbps ports are in a close cluster and patching between blades in a chassis switch is not required.
When directly connecting a parallel optics 40 Gigabit Ethernet transceiver to another 40 Gigabit Ethernet transceiver, a Type-B pinless-pinless MTP jumper should be used. This reverse fiber positioning allows the signal to flow from transmission on one end of the link to reception on the other end. Figure 14 shows two switch ports directly cabled with an MTP jumper patch cord.
Similar to the bidirectional cabling approach, the most basic structured cabling solution is an interconnect. The only difference between an interconnect solution and parallel optics is that the connector type of the patch panels instead is MTP. Figure 15 shows several interconnect link scenarios with various patch-panel options. As previously discussed, the 2x3 conversion modules, depicted in Figure 15a, allow percent fiber utilization and constitute the most commonly deployed method.
Another advantage of the conversion module is reduced jumper complexity. Notice that a G jumper, which has a Type-B polarity and is pinless, is used to directly connect two parallel optics transceivers.
That same jumper is used on both ends of the interconnect link, thus eliminating concerns about correct pinning. In Figure 15b, the same trunk is used, but the jumper type is now labeled F. Thus, when you install the jumper, you would install the pinned end in the patch panel, and you would install the pinless end in the electronics.
However, because of the pinning, this same jumper could not be used to make a direct connection between two ports.
Hence, you can see the advantages of the conversion modules, which both use all the fiber and allow a single-jumper solution.
The combined solution shown in Figure 15c might be deployed when cabling between a spine switch, where the module is placed, and a ToR leaf switch, where the conversion harness and panel are located. The QSFP ports on the leaf switch are closely clustered, so the short breakouts of the 2x3 harness assembly should not be a concern.
However, use of the 2x3 harness assembly at the core spine switch is not desirable because patching across blades and chassis is a common practice. Table 8. Sample part numbers for parallel optics cabling options. Note: A higher-density 4x6 module is also available. Note: This example uses a fiber trunk cable, but trunk cables can have 12 to fiber at any length. As with bidirectional cabling, a cross-connect design allows the most network flexibility. Figure 16 shows two cross-connect network link designs for cabling a 40 Gigabit Ethernet parallel optics transceiver.
Figure 16a shows a conversion module example, which again is the most common and preferred method. Notice in this design that all three jumpers two at the electronics on the left side of the figure and the one at the cross-connect on the right side of the figure in the link are G jumpers, which according to the BoM in Table 9 are Type-B polarity, and both MTP cables are pinless.
Thus, in a conversion module deployment, only one jumper type is used for a direct-connect, interconnect, or cross-connect cabling scenario. However, notice in Figure 16b that this is not the case for a non-conversion cabling scenario, in which standard MTP patch panels are deployed. Here the patch cords at the electronics are pinless into the electronics to pinned into the patch panel , although the patch cords at the cross-connect are both pinned going into the patch panel.
Thus, for a direct-connect, interconnect, and cross-connect cabling scenario, three different pinned jumpers are required. An alternative approach is to install pinned MTP trunks in the structured cabling, but this approach can be used mainly in new installations because the traditional MTP trunks installed over the past decade have been pinless.
Table 9. Note: A higher-density 4x6 module also is available. Note: The example shows a fiber trunk cable, but trunk cables can have 12 to fibers at any length. Structured cabling using an MTP cabling infrastructure can be used with current 10 Gigabit Ethernet environments while maintaining investment protection for Gbps environments and beyond. With the new 40 Gigabit Ethernet bidirectional transceivers, no changes to the cabling infrastructure are required when transitioning from 10 to 40 Gigabit Ethernet.
Extended 40 Gigabit Ethernet link distances, which match the distances at 10 Gigabit Ethernet, can be achieved by converting to parallel optics transceivers. These transceivers require a change in traditional cabling practices. However, if structured cabling has been implemented with MTP-based trunk cables, then making the conversion is as simple as swapping the patch panels.
Thus, the existing MTP-LC modules that were used in the two-fiber serial transmission would be replaced with MTP conversion modules for parallel optics. New data center switching platforms, such as the Cisco Nexus Series, are now using the cost-effective, lower-power optics at 40 Gbps to deploy innovative and flexible networking solutions.
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Created by tgambus on AM. Created by Mohamed Alhenawy on PM. Ask a Question. Find more resources. Blogs Networking Blogs Networking News. Project Gallery. New Community Member Guide. The mode-conditioning patch cord is installed between the transceiver and the patch panel.
Two mode-conditioning patch cords are required per installation. To install the patch cord, follow these steps:. Another alternative for short reaches within the same location is to use a single-mode patch cable. There will be no saturation over single-mode fiber. In some cases, customers might experience that a link would be operating properly over OM2 fiber type without MCP.
In the event customers remain reluctant to deploy MCP cables over OM2, and for customers using OM3 cables, it is required to a plug a 5-dB attenuator for nm at the transmitter source of the optical module on each side of the link in order to avoid saturation, and potential subsequent link flaps and damage to the device. It is highly recommended to measure the power level before plugging the fiber into the adjacent receiver. When the received power is measured to be above 0.
For more information about the Gigabit Ethernet and 10 Gigabit Ethernet Cisco transceiver modules, visit:. PB This bulletin describes the necessary steps to help ensure that Gigabit and 10 Gigabit Ethernet laser-based transmissions over multimode fiber MMF are successfully implemented and supported.
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