Networking

In order to meet the overwhelming trend of growing bandwidth, different standards for single-mode and multimode fibers are published, and parallel fiber connector (MTP/MPO) is designed to solve the problem of increasing fiber count. Though the fiber types are changing, the use of the parallel connector seems not to be outdated, not only for present 40G and 100G applications, but also for future 200G and 400G. This post will discuss the issue on a new fiber type and the role of parallel fiber in 40GbE and beyond networks. Overview on Multimode and Single-mode Fibers Since the establishment of multimode fiber in the early 1980s, there has been OM1 and OM2, and laser optimized OM3 and OM4 fibers for 10GbE, 40GbE and 100GbE. OM5, the officially designated wideband multimode fiber (WBMMF), is a new fiber medium specified in ANSI/TIA-492AAAE. The channel capacity of multimode fiber has multiplied by using parallel transmission over several fiber strands. In terms of single-mode fiber,

Multifiber MTP/MPO cable is a preferable choice for high-density telecom and datacom cabling. For the outer jacket of MTP/MPO cable, there are many terms to describe it, such as CM, LSZH, CMP, CMR, PVC, etc. FS.COM carries several of these technologies. Do you know the differences between them? And what are the characteristics of each type? Most importantly, which one do you need for the task? This post will introduce some major jacket types for  MTP/MPO cables  and the other acronyms for communication cable ratings. Figure 1: MTP/MPO cabling. CMP CMP (plenum-rated) MTP/MPO cable complies the IEC (International Electrotechnical Commission) 60332-1 flammability standard. CMP MTP/MPO cable is designed to be used in plenum spaces, where air circulation for heating and air conditioning systems can be facilitated, by providing pathways for either heated/conditioned or return airflows. Typical plenum spaces are between the structural ceiling and the drop ceiling or under a raised fl

Since we have discussed connectivity solutions for two duplex optics or two parallel optics in the last post (see previous post:  Connectivity Solutions for Duplex and Parallel Optics ), the connectivity solutions for parallel to duplex optics will be discussed in this article, including 8-fiber to 2-fiber, and 20-fiber to 2-fiber. Parallel to Duplex Direct Connectivity When directly connecting one 8-fiber transceiver to four duplex transceivers, an 8-fiber MTP to duplex LC harness cable is needed. The harness will have four LC duplex connectors and the fibers will be paired in a specific way, assuring the proper polarity is maintained. This solution is suggested only for short distance within a given row or in the same rack/cabinet. Figure 1: 8-fiber to 2-fiber direct connectivity Parallel to Duplex Interconnect This is an 8-fiber to 2-fiber interconnect. The solution in figure 2 allows for patching on both ends of the fiber optic link. The devices used in this link are