Nowadays, a huge number of bandwidth-hunger devices are housed in data centers, like clustered storage systems, backup devices, and various servers, which are all connected by networking equipment. These devices need reliable and scalable cabling structure for high performance and flexibility. For some large- or middle-sized enterprises, their billion-dollar business lie in the suitable deployment of fiber patch cords and fiber optic transceivers. Since there are many kinds of patch cables available in the market for transceiver modules to promote data transmission in enterprises’ data centers, it seems a little difficult to choose the right kind for such transceivers. This text tackles this issue and provides some selection guide.
When delve into this topic, it’s imperative to have a basic understanding of the fiber optic transceiver.
Fiber optic transceiver, just as its name replies, is a self-contained component that can both transmit and receive signals. In most cases, this transceiver is plugged in devices such as routers or network interface cards which offer one or more transceiver module slot. In its whole signal transmission process, the transmitter takes an electrical input and converts it to an optical output from a laser diode or LED. The light from the transmitter is coupled into the fiber with a connector and is transmitted through the fiber optic cable plant. The light from the end of the fiber is coupled to a receiver where a detector converts the light into an electrical signal which is then conditioned properly for use by the receiving equipment.
According to different protocols, a wide range of optical transceivers are designed to support different data rates, including Gigabit SFP transceiver, 10G SFP+ transceiver, 40G QSFP+, etc..Take MGBBX1 for example, this Cisco 1000BASE-BX-U SFP is designed to be applied in Gigabit Ethernet (GbE) applications.
Fiber optic patch cord, also called fiber jumper or fiber optic patch cable, consists of fiber optic cable terminated with different connectors on the ends. It’s typical application includes computer work station to outlet and patch panels or optical cross connect distribution center. While selecting patch cord, it’s recommended to take on from the following aspects, fiber cable mode, cable structure, connector types and so on.
- Single-mode/Multi-mode Patch Cord
It’s known that fiber patch cords can be classified into single-mode and multi-mode fiber patch cord based on cable mode used. Single-mode patch cords, usually in yellow color, are with 9/125 fiber glass and has only one pathway for signal transmission, while multi-mode ones, often in orange, are with OM1 62.5/125 or OM2 50/125 fiber glass, and allow multiple pathways and several wavelengths of light to be transmitted with the large core.
- Simplex/Duplex Patch Cord
According to the cable structure, patch cord can be divided into simplex and duplex versions. Simplex, also known as single strand, patch cable has one fiber, while duplex cable has two fibers joined with a thin web. Both simplex and duplex patch cords are available in single-mode or multi-mode versions. Because simplex patch cord has only one fiber link, its typically deployed for applications that only require one-way data transfer. For those applications, like fiber switches and servers, it’s advised to select duplex fiber optic cable for simultaneous and bidirectional data transfer. Additionally, there is also ribbon fan-out cable assembly (ie. one end is ribbon fiber with multi fibers and one ribbon fiber connector such as MTP connector (12 fibers), the other end is multi simplex fiber cables with connectors such as ST, SC, LC, etc.).
- Patch Cord With Different Connectors
By connector type standard, fiber patch cord can also be divided. For instance, LC fiber patch cable is named as it is with LC connector. Similarly, there are SC, ST, FC, MT-RJ, E2000, MU and MPO/MTP fiber patch cables. Additionally, there are PC, UPC, APC type fiber patch cords, which are differentiated from the polish of fiber connectors.
After respective introduction to fiber optic transceiver and fiber patch cord, let’s go to the core issue—to choose the suitable cable type for transceivers.
In this part, I will take Cisco transceiver modules for example. For example, I need the suitable cable type for these two Cisco GbE transceiver modules, GLC-EX-SMD and MGBLX1. Then how to choose the right type? According to “Cisco Gigabit Ethernet Transceiver Modules Compatibility Matrix”, GLC-EX-SMD is the 1000BASE-EX SFP module that works through single-mode fiber (SMF) with LC duplex, and MGBLX1 is the 1000BASE-LX SFP module also for SMF with LC duplex. In such a case, since both two modules operate on SMF with LC connector, what I need is the with LC-LC duplex single-mode patch cable.
The above-mentioned example just lists one patch cable type for fiber optic transceivers. There are several commonly-aused patch cable types: LC-LC Simplex 9/125 Single-mode Fiber Patch Cable, LC-SC Duplex 9/125 Single-mode Fiber Patch Cable, LC-LC Duplex OM1 62.5/125 Multi-mode Fiber Patch Cable, ect.. Fiberstore supplies various kinds of high-quality patch cords for transceiver modules. You can visit Fiberstore for more information about patch cords.