Issue link: https://www.e-digitaleditions.com/i/1066130
January/February 2019 I 53 0% 100G-CWDM4 $ (Relative to 100G-CWDM4) Transceiver Relative Sale Price 100G-PSM4 400G-FR4 400GBASE-DR4 50% 100% 150% 200% 250% 300% 350% $/Gb/s (Relative to 100G-CWDM4) FIGURE 1: Total cost and normalized per Gb/s relative to the cost of 100 Gb-CWDM4 transceiver. XCVR Patch Panel Pre-term Trunk Assembly Patch Panel XCVR XCVR Patch Panel Pre-term Trunk Assembly Patch Panel Patch Panel XCVR Patch Panel Pre-term Trunk Assembly One Segment Link Two-Segment Link FIGURE 2: A one-segment and two- segment based structured cabling schematic with optical links. COST ANALYSIS METHODOLOGY FOR OPTICS AND CABLING & CONNECTIVITY 1. Optics This section details the cost analysis methodology used for the derivation of total cost of ownership. Based on market research 4 and information from various transceiver manufacturers, the estimated cost difference between transceivers for the CWDM4 architecture versus PSM4 architecture is approximately 30%. Similarly, the 400 Gb optics, when they achieve market maturity, could cost about 300% more than 100 Gb optics today. This is based on an educated assumption because today's 400 Gb pricing may not reflect the pricing when that market matures. Figure 1 summarizes the relative (to 100 Gb-CWDM4) sale price of 100 Gb and 400 Gb optics. If decisions were based solely on the cost of optics, a PSM4 architecture might be preferred. 2. Cabling and Connectivity For calculating the cost of cabling and connectivity with each of the discussed transceivers, consider the following scenario. A structured cabling infrastructure has three components: patch cords, pre- terminated trunk cable assemblies, and patch panels/adapter panels. Figure 2 shows the typical configurations for one-segment and two-segment based structured cabling infrastructure. For structured cabling designed for CWDM4 based transceivers, assume all connections, including those on the pre- terminated trunk assembly, are Duplex-LC. For PSM4 based transceivers, assume that all the connection points incorporate 12-fiber MPO connectors. For calculating the number of adapter patch panels, patch cords, and pre-terminated trunks, simple math based on the structured cabling segmentation is used as follows: If N is the number of segments, then the Number of patch cords = N+1; Number of Adapters = 2N; Number of trunk cables = N. Typically, in a structured cabling infrastructure, the patch panels have certain port density associated with them that are design specific. The cost calculations take into account 24-port, 48-port, and 72-port per one rack unit (1RU) considerations, the calculated total cost of the link (including all the components of the structured cabling), and then the normalized cost per port.