{"id":3079,"date":"2022-11-02T09:51:30","date_gmt":"2022-11-02T09:51:30","guid":{"rendered":"https:\/\/www.fibermall.com\/blog\/?p=3079"},"modified":"2023-02-13T08:06:00","modified_gmt":"2023-02-13T08:06:00","slug":"optical-interconnection-technology-what-are-optical-transceiver-modules-aoc-dac-and-acc","status":"publish","type":"post","link":"https:\/\/www.fibermall.com\/blog\/what-are-optical-transceiver-modules-aoc-dac-acc.htm","title":{"rendered":"Optical Interconnection Technology: What are Optical Transceiver Modules, AOC, DAC, and ACC?"},"content":{"rendered":"

In addition to the PCB board or backplane, there are many ways to achieve high-speed connection, which do not necessarily require optical modules. According to different transmission distances, costs, and wiring flexibility requirements, The main connection modes are Direct Attach Cable (DAC), Active Copper Cable (ACC), Active Optical Cable (AOC<\/a>), and Optical Transceiver\u00a0 Module (Optical Module) connect several ways. The following table is a comparison of the main features of several high-speed connections.<\/p>\n\n\n\n\n\t\n\n\t\n\t\n\t\n\t
Connection method<\/th>Price<\/th>Connection distance<\/th>Weight<\/th>Flexibility<\/th>Power consumption<\/th>Reliability<\/th>Main application scenarios<\/th>\n<\/tr>\n<\/thead>\n
DAC\/ACC<\/td>\u2606<\/td>\u2606<\/td>\u2606\u2606<\/td>\u2606\u2606<\/td>\u2606\u2606\u2606\u2606<\/td>\u2606\u2606\u2606\u2606<\/td>In-cabinet or adjacent cabinets; server-switch connection<\/td>\n<\/tr>\n
AOC<\/td>\u2606\u2606\u2606<\/td>\u2606\u2606<\/td>\u2606\u2606\u2606\u2606<\/td>\u2606\u2606\u2606<\/td>\u2606\u2606<\/td>\u2606\u2606\u2606<\/td>Within a cabinet or in the same row of cabinets; server-switch connection<\/td>\n<\/tr>\n
Multi-mode optical module<\/td>\u2606\u2606<\/td>\u2606\u2606<\/td>\u2606\u2606\u2606\u2606<\/td>\u2606\u2606\u2606\u2606<\/td>\u2606\u2606<\/td>\u2606\u2606<\/td>In the same row of cabinets or in the same server room; switch-switch connection<\/td>\n<\/tr>\n
Single-mode optical module<\/td>\u2606<\/td>\u2606\u2606\u2606\u2606<\/td>\u2606\u2606\u2606\u2606<\/td>\u2606\u2606\u2606\u2606<\/td>\u2606<\/td>\u2606\u2606<\/td>Within or across server rooms; switch-switch connection<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n\n

DAC (Direct Attach Cable)<\/strong><\/a>, also known as Passive Copper Cable, uses conductive copper wires to connect two ends directly. DAC internal is generally a shielded Twinax structure, commonly used wire 24AWG, 26AWG, 28AWG, 30AWG, 32AWG, etc. The smaller the AWG value, the thicker the wire, while the loss is also smaller. So long-distance DACs are usually made of wire with a smaller AWG value, but thicker wire is less easy to bend and heavier.<\/p>\n

DACs have no passive components inside, so they have low power consumption, wide temperature range, high reliability, and are generally cheaper. Therefore\u00a0they are widely used for 10G interface connections (such as 10Gbps SFP+ interfaces or 4*10Gbps QSFP+ interfaces).<\/p>\n