{"product_id":"d-link-dem-cb100q28-4s28","title":"D-Link DEM-CB100Q28-4S28 100G QSFP28 to 4 SFP28 Breakout Cable","description":"\u003cdiv id=\"ace-d-link-dem-cb100q28-4s28-copy\"\u003e\n\u003cstyle\u003e\n#ace-d-link-dem-cb100q28-4s28-copy { font-family: inherit; color: inherit; }\n\/* Reuses the current ACE calculator FAQ disclosure treatment. Scope: this product FAQ only. *\/\n#ace-d-link-dem-cb100q28-4s28-copy .ace-article-faq { --ace-family-ink: #21352b; --ace-family-muted: #5b6961; --ace-family-line: #d3d9d5; --ace-family-soft: #f4f7f4; margin: 24px 0; padding: 0; background: transparent; font-family: inherit; }\n#ace-d-link-dem-cb100q28-4s28-copy .ace-article-faq details.ace-form-disclosure { margin: 0 0 12px; padding: 0; border: 1px solid var(--ace-family-line); border-radius: 12px; background: #fff; overflow: visible; }\n#ace-d-link-dem-cb100q28-4s28-copy .ace-article-faq details \u003e summary { display: flex; align-items: center; justify-content: space-between; gap: 16px; min-height: 56px; margin: 0; padding: 16px 20px; border-radius: 12px; background: var(--ace-family-soft); color: var(--ace-family-ink); font: inherit; font-size: 16px; font-weight: 600; line-height: 1.4; list-style: none; cursor: pointer; }\n#ace-d-link-dem-cb100q28-4s28-copy .ace-article-faq summary::-webkit-details-marker { display: none; }\n#ace-d-link-dem-cb100q28-4s28-copy .ace-article-faq summary::marker { content: ''; }\n#ace-d-link-dem-cb100q28-4s28-copy .ace-article-faq summary::before, #ace-d-link-dem-cb100q28-4s28-copy .ace-article-faq summary::after { content: none; }\n#ace-d-link-dem-cb100q28-4s28-copy .ace-article-faq details[open] \u003e summary { border-radius: 12px 12px 0 0; border-bottom: 0; }\n#ace-d-link-dem-cb100q28-4s28-copy .ace-article-faq h3.ace-form-title { display: flex; align-items: center; justify-content: space-between; gap: 16px; width: 100%; min-width: 0; margin: 0 !important; padding: 0; color: var(--ace-family-ink); font-family: inherit; font-size: 16px; font-weight: 600; line-height: 1.35; letter-spacing: normal; text-transform: none; }\n#ace-d-link-dem-cb100q28-4s28-copy .ace-article-faq .ace-form-title-text { display: flex; flex: 1 1 auto; min-width: 0; margin: 0; overflow-wrap: anywhere; }\n#ace-d-link-dem-cb100q28-4s28-copy .ace-article-faq .ace-form-toggle { display: inline-flex; align-items: center; gap: 10px; flex: 0 0 auto; margin: 0 0 0 auto; padding: 0; color: #55605a; font-size: 12px; line-height: 1.4; font-weight: 500; white-space: nowrap; }\n#ace-d-link-dem-cb100q28-4s28-copy .ace-article-faq details \u003e summary .ace-form-collapse { display: none; }\n#ace-d-link-dem-cb100q28-4s28-copy .ace-article-faq details[open] \u003e summary .ace-form-expand { display: none; }\n#ace-d-link-dem-cb100q28-4s28-copy .ace-article-faq details[open] \u003e summary .ace-form-collapse { display: inline; }\n#ace-d-link-dem-cb100q28-4s28-copy .ace-article-faq .ace-form-chevron { display: inline-block; width: 8px; height: 8px; margin: 0 2px 4px; border-bottom: 2px solid currentColor; border-right: 2px solid currentColor; transform: rotate(45deg); transition: transform .15s ease; }\n#ace-d-link-dem-cb100q28-4s28-copy .ace-article-faq details[open] \u003e summary .ace-form-chevron { transform: rotate(225deg); margin-bottom: 0; }\n#ace-d-link-dem-cb100q28-4s28-copy .ace-article-faq .ace-form-body { margin: 0; padding: 20px; min-width: 0; color: var(--ace-family-ink); font-size: 15px; line-height: 1.65; }\n#ace-d-link-dem-cb100q28-4s28-copy .ace-article-faq .ace-form-body \u003e p { margin: 0; line-height: 1.65; }\n#ace-d-link-dem-cb100q28-4s28-copy .ace-article-faq summary:focus-visible { outline: 3px solid #24731a; outline-offset: 3px; }\n@media (max-width: 640px) {\n  #ace-d-link-dem-cb100q28-4s28-copy .ace-article-faq details \u003e summary { padding: 14px 16px; gap: 12px; }\n  #ace-d-link-dem-cb100q28-4s28-copy .ace-article-faq h3.ace-form-title { gap: 12px; }\n  #ace-d-link-dem-cb100q28-4s28-copy .ace-article-faq .ace-form-body { padding: 16px; }\n  #ace-d-link-dem-cb100q28-4s28-copy .ace-article-faq .ace-form-toggle { font-size: 11px; gap: 8px; }\n}\n@media (prefers-reduced-motion: reduce) { #ace-d-link-dem-cb100q28-4s28-copy .ace-article-faq .ace-form-chevron { transition: none; } }\n\n\n#ace-d-link-dem-cb100q28-4s28-copy .ace-article-faq { width:100%; max-width:100%; box-sizing:border-box; }\n#ace-d-link-dem-cb100q28-4s28-copy .ace-article-faq .ace-form-body { border:0; box-shadow:none; }\n\u003c\/style\u003e\n\u003ch2\u003eA Direct Connection for a Planned High-Speed Rack\u003c\/h2\u003e\n\u003cp\u003eThe DEM-CB100Q28-4S28 is a passive copper direct attach cable for supported high-speed network equipment. A QSFP28 connector at one end connects to four SFP28 ends, supporting four 25GbE lanes when the host is configured for the correct breakout mode. Its factory-terminated one-metre assembly suits a short, deliberately planned rack connection.\u003c\/p\u003e\n\u003cp\u003eIntegrated connectors remove the need to buy separate optical modules and fibre leads for this copper link. Confirm both host models, supported firmware and cable compatibility before deployment. The cable does not convert an incompatible port, provide arbitrary speed negotiation or replace the port configuration required by the equipment.\u003c\/p\u003e\n\u003ch2\u003eHighlights\u003c\/h2\u003e\n\u003ch3\u003eConnection Layout\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e1 × QSFP28 to 4 × SFP28.\u003c\/li\u003e\n\u003cli\u003e4 × 25GbE with supported 100G breakout mode.\u003c\/li\u003e\n\u003cli\u003eFixed 1 m factory-terminated passive copper assembly.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eRack Planning\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e30 AWG twinaxial construction.\u003c\/li\u003e\n\u003cli\u003eNo separate optical transceivers or fibre leads needed for this link.\u003c\/li\u003e\n\u003cli\u003eConfirm exact host compatibility at both ends.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003ePhysical Specification\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eMinimum bend radius 23 mm.\u003c\/li\u003e\n\u003cli\u003eOperating temperature −40°C to 75°C.\u003c\/li\u003e\n\u003cli\u003e5-year warranty.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch2\u003eKey Features\u003c\/h2\u003e\n\u003ch3\u003eA Factory-Terminated Copper Link\u003c\/h3\u003e\n\u003cp\u003eThe integrated connectors and twinaxial copper cable form one assembly. This provides a straightforward short rack connection without selecting separate optical modules and fibre leads. It is a direct attach cable, not an RJ-45 patch lead or an optical transceiver that can be separated from the cable.\u003c\/p\u003e\n\u003ch3\u003eUnderstand the Port Layout\u003c\/h3\u003e\n\u003cp\u003eOne QSFP28 end breaks out to four SFP28 ends. The parent port must explicitly support four 25GbE breakout operation and be configured accordingly. The cable alone cannot make an unsupported 100G port split into four independent links.\u003c\/p\u003e\n\u003ch3\u003eMatch Both Host Devices\u003c\/h3\u003e\n\u003cp\u003eCheck each switch or adapter model and its current cable compatibility list. Supported firmware, port settings and vendor coding can matter even when the connectors fit. Avoid treating a general form-factor match as a guarantee that the connection will work with unrelated equipment.\u003c\/p\u003e\n\u003ch3\u003eRoute the One-Metre Assembly\u003c\/h3\u003e\n\u003cp\u003eAllow for the path between ports, cable management and safe connector access. The factory length is one metre and cannot be extended by ordinary fibre adapters. Keep bends at or above the specified 23 mm minimum radius. Avoid tension on the connectors and leave service access in the rack.\u003c\/p\u003e\n\u003ch3\u003ePassive Construction for a Short Distance\u003c\/h3\u003e\n\u003cp\u003eThe passive assembly is intended for supported short copper links. It does not have a separate mains power adapter and is not a solution for long-distance fibre runs. Choose an optical connection instead when the distance, electrical environment or host requirements call for fibre.\u003c\/p\u003e\n\u003ch3\u003eCommission Before Depending on the Link\u003c\/h3\u003e\n\u003cp\u003eConfirm link speed and error counters after installation, then test the traffic path required by the application. Label the four branch ends so the breakout mapping remains clear during maintenance. Follow the equipment vendor’s insertion and removal instructions and protect connector contacts from contamination.\u003c\/p\u003e\n\u003ch2\u003eSummary\u003c\/h2\u003e\n\u003cp\u003eThe DEM-CB100Q28-4S28 is a fixed one-metre passive DAC for supported 100G-to-four 25G breakout connections. Match the hosts, port mode and rack route before selecting the assembly.\u003c\/p\u003e\n\u003csection class=\"ace-article-faq\" aria-label=\"Frequently asked questions\"\u003e\u003ch3\u003eFrequently Asked Questions\u003c\/h3\u003e\n\u003cdetails class=\"ace-form-disclosure\" open\u003e\u003csummary\u003e\u003ch3 class=\"ace-form-title\"\u003e\n\u003cspan class=\"ace-form-title-text\"\u003eWhat Connectors Does It Have?\u003c\/span\u003e\u003cspan class=\"ace-form-toggle\" aria-hidden=\"true\"\u003e\u003cspan class=\"ace-form-expand\"\u003eExpand\u003c\/span\u003e\u003cspan class=\"ace-form-collapse\"\u003eCollapse\u003c\/span\u003e\u003cspan class=\"ace-form-chevron\"\u003e\u003c\/span\u003e\u003c\/span\u003e\n\u003c\/h3\u003e\u003c\/summary\u003e\u003cdiv class=\"ace-form-body\"\u003e\u003cp\u003eOne QSFP28 connector and four SFP28 connectors.\u003c\/p\u003e\u003c\/div\u003e\u003c\/details\u003e\n\u003cdetails class=\"ace-form-disclosure\"\u003e\u003csummary\u003e\u003ch3 class=\"ace-form-title\"\u003e\n\u003cspan class=\"ace-form-title-text\"\u003eDoes It Require Breakout Support?\u003c\/span\u003e\u003cspan class=\"ace-form-toggle\" aria-hidden=\"true\"\u003e\u003cspan class=\"ace-form-expand\"\u003eExpand\u003c\/span\u003e\u003cspan class=\"ace-form-collapse\"\u003eCollapse\u003c\/span\u003e\u003cspan class=\"ace-form-chevron\"\u003e\u003c\/span\u003e\u003c\/span\u003e\n\u003c\/h3\u003e\u003c\/summary\u003e\u003cdiv class=\"ace-form-body\"\u003e\u003cp\u003eYes. The QSFP28 host must support and be configured for four 25GbE breakout operation. The cable cannot add this function to an unsupported port.\u003c\/p\u003e\u003c\/div\u003e\u003c\/details\u003e\n\u003cdetails class=\"ace-form-disclosure\"\u003e\u003csummary\u003e\u003ch3 class=\"ace-form-title\"\u003e\n\u003cspan class=\"ace-form-title-text\"\u003eWhat Is the Cable Length?\u003c\/span\u003e\u003cspan class=\"ace-form-toggle\" aria-hidden=\"true\"\u003e\u003cspan class=\"ace-form-expand\"\u003eExpand\u003c\/span\u003e\u003cspan class=\"ace-form-collapse\"\u003eCollapse\u003c\/span\u003e\u003cspan class=\"ace-form-chevron\"\u003e\u003c\/span\u003e\u003c\/span\u003e\n\u003c\/h3\u003e\u003c\/summary\u003e\u003cdiv class=\"ace-form-body\"\u003e\u003cp\u003eThis offer is the fixed 1 m factory assembly. Allow for routing and the minimum bend radius when planning the rack.\u003c\/p\u003e\u003c\/div\u003e\u003c\/details\u003e\n\u003cdetails class=\"ace-form-disclosure\"\u003e\u003csummary\u003e\u003ch3 class=\"ace-form-title\"\u003e\n\u003cspan class=\"ace-form-title-text\"\u003eAre Separate Optical Modules Needed?\u003c\/span\u003e\u003cspan class=\"ace-form-toggle\" aria-hidden=\"true\"\u003e\u003cspan class=\"ace-form-expand\"\u003eExpand\u003c\/span\u003e\u003cspan class=\"ace-form-collapse\"\u003eCollapse\u003c\/span\u003e\u003cspan class=\"ace-form-chevron\"\u003e\u003c\/span\u003e\u003c\/span\u003e\n\u003c\/h3\u003e\u003c\/summary\u003e\u003cdiv class=\"ace-form-body\"\u003e\u003cp\u003eNo. This copper DAC has integrated connectors. It does not use separate optical modules or fibre patch leads.\u003c\/p\u003e\u003c\/div\u003e\u003c\/details\u003e\n\u003cdetails class=\"ace-form-disclosure\"\u003e\u003csummary\u003e\u003ch3 class=\"ace-form-title\"\u003e\n\u003cspan class=\"ace-form-title-text\"\u003eWill It Work With Any Brand?\u003c\/span\u003e\u003cspan class=\"ace-form-toggle\" aria-hidden=\"true\"\u003e\u003cspan class=\"ace-form-expand\"\u003eExpand\u003c\/span\u003e\u003cspan class=\"ace-form-collapse\"\u003eCollapse\u003c\/span\u003e\u003cspan class=\"ace-form-chevron\"\u003e\u003c\/span\u003e\u003c\/span\u003e\n\u003c\/h3\u003e\u003c\/summary\u003e\u003cdiv class=\"ace-form-body\"\u003e\u003cp\u003eDo not assume universal compatibility. Check both exact host models, firmware and supported cable lists.\u003c\/p\u003e\u003c\/div\u003e\u003c\/details\u003e\n\u003cdetails class=\"ace-form-disclosure\"\u003e\u003csummary\u003e\u003ch3 class=\"ace-form-title\"\u003e\n\u003cspan class=\"ace-form-title-text\"\u003eCan It Be Used for a Long Fibre Run?\u003c\/span\u003e\u003cspan class=\"ace-form-toggle\" aria-hidden=\"true\"\u003e\u003cspan class=\"ace-form-expand\"\u003eExpand\u003c\/span\u003e\u003cspan class=\"ace-form-collapse\"\u003eCollapse\u003c\/span\u003e\u003cspan class=\"ace-form-chevron\"\u003e\u003c\/span\u003e\u003c\/span\u003e\n\u003c\/h3\u003e\u003c\/summary\u003e\u003cdiv class=\"ace-form-body\"\u003e\u003cp\u003eNo. It is a short passive copper assembly. A suitable optical module and fibre system are needed for a longer optical connection.\u003c\/p\u003e\u003c\/div\u003e\u003c\/details\u003e\n\u003c\/section\u003e\n\u003c\/div\u003e","brand":"D-Link","offers":[{"title":"Default Title","offer_id":44849072635963,"sku":"DEM-CB100Q28-4S28","price":283.41,"currency_code":"SGD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0557\/4541\/3179\/files\/d-link-dem-cb100q28-4s28-100g-qsfp28-to-4-sfp28-breakout-cable-6525895.png?v=1793693893","url":"https:\/\/aceperipherals.com\/ja\/products\/d-link-dem-cb100q28-4s28","provider":"ACE Peripherals","version":"1.0","type":"link"}