{"product_id":"d-link-dem-311gt","title":"D-Link DEM-311GT 1000BASE-SX Multi-Mode LC SFP Transceiver","description":"\u003cdiv id=\"ace-d-link-dem-311gt-copy\"\u003e\n\u003cstyle\u003e\n#ace-d-link-dem-311gt-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-311gt-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-311gt-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-311gt-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-311gt-copy .ace-article-faq summary::-webkit-details-marker { display: none; }\n#ace-d-link-dem-311gt-copy .ace-article-faq summary::marker { content: ''; }\n#ace-d-link-dem-311gt-copy .ace-article-faq summary::before, #ace-d-link-dem-311gt-copy .ace-article-faq summary::after { content: none; }\n#ace-d-link-dem-311gt-copy .ace-article-faq details[open] \u003e summary { border-radius: 12px 12px 0 0; border-bottom: 0; }\n#ace-d-link-dem-311gt-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-311gt-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-311gt-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-311gt-copy .ace-article-faq details \u003e summary .ace-form-collapse { display: none; }\n#ace-d-link-dem-311gt-copy .ace-article-faq details[open] \u003e summary .ace-form-expand { display: none; }\n#ace-d-link-dem-311gt-copy .ace-article-faq details[open] \u003e summary .ace-form-collapse { display: inline; }\n#ace-d-link-dem-311gt-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-311gt-copy .ace-article-faq details[open] \u003e summary .ace-form-chevron { transform: rotate(225deg); margin-bottom: 0; }\n#ace-d-link-dem-311gt-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-311gt-copy .ace-article-faq .ace-form-body \u003e p { margin: 0; line-height: 1.65; }\n#ace-d-link-dem-311gt-copy .ace-article-faq summary:focus-visible { outline: 3px solid #24731a; outline-offset: 3px; }\n@media (max-width: 640px) {\n  #ace-d-link-dem-311gt-copy .ace-article-faq details \u003e summary { padding: 14px 16px; gap: 12px; }\n  #ace-d-link-dem-311gt-copy .ace-article-faq h3.ace-form-title { gap: 12px; }\n  #ace-d-link-dem-311gt-copy .ace-article-faq .ace-form-body { padding: 16px; }\n  #ace-d-link-dem-311gt-copy .ace-article-faq .ace-form-toggle { font-size: 11px; gap: 8px; }\n}\n@media (prefers-reduced-motion: reduce) { #ace-d-link-dem-311gt-copy .ace-article-faq .ace-form-chevron { transition: none; } }\n\n\n#ace-d-link-dem-311gt-copy .ace-article-faq { width:100%; max-width:100%; box-sizing:border-box; }\n#ace-d-link-dem-311gt-copy .ace-article-faq .ace-form-body { border:0; box-shadow:none; }\n\u003c\/style\u003e\n\u003ch2\u003eSpecify the Right Gigabit Fibre Link\u003c\/h2\u003e\n\u003cp\u003eThe DEM-311GT connects a supported Gigabit SFP port to multi-mode fibre through a duplex LC interface. Its 850 nm optical design supports links up to 550 m over suitable multimode fibre, with reach dependent on the installed fibre grade. It suits switch-to-switch links and other compatible network connections where the optical path is planned as a complete system.\u003c\/p\u003e\n\u003cp\u003eThe hot-pluggable SFP format allows a module to be installed or replaced in supported powered equipment. Match the host, far-end optical standard and fibre type before deployment. This is a two-fibre duplex connection, not a single-strand BiDi module, and the patch lead and second endpoint are selected separately.\u003c\/p\u003e\n\u003ch2\u003eHighlights\u003c\/h2\u003e\n\u003ch3\u003eOptical Connection\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e1000BASE-SX Gigabit Ethernet.\u003c\/li\u003e\n\u003cli\u003eDuplex LC interface; 850 nm wavelength.\u003c\/li\u003e\n\u003cli\u003eMulti-Mode fibre; up to 550 m reach under suitable link conditions.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eHost Integration\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eSFP form factor and 3.3 V host supply.\u003c\/li\u003e\n\u003cli\u003eHot-pluggable in supported equipment.\u003c\/li\u003e\n\u003cli\u003eConfirm exact host and firmware compatibility.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eLink Planning\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eTwo optical paths for transmit and receive.\u003c\/li\u003e\n\u003cli\u003eFibre lead and far-end module purchased separately.\u003c\/li\u003e\n\u003cli\u003e5-year warranty.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch2\u003eKey Features\u003c\/h2\u003e\n\u003ch3\u003eMatch the Fibre Already Installed\u003c\/h3\u003e\n\u003cp\u003eThis module uses 50\/125 µm or 62.5\/125 µm multimode fibre. Multimode reach depends on the fibre core, grade and condition; a headline maximum is not a promise for every installed cable. Check the actual fibre plant rather than choosing a module by connector colour alone.\u003c\/p\u003e\n\u003ch3\u003eA Duplex LC Optical Interface\u003c\/h3\u003e\n\u003cp\u003eTwo LC fibre paths carry transmit and receive signals. Connect them to a compatible optical endpoint with the correct polarity. A single-fibre WDM or BiDi module is a different link design and should not be substituted simply because it uses a similar LC connector.\u003c\/p\u003e\n\u003ch3\u003eGigabit Performance in a Small Module\u003c\/h3\u003e\n\u003cp\u003eThe SFP module supports 1000BASE-SX Gigabit Ethernet in an accepted host port. It does not upgrade an unsupported interface to a higher speed or turn every SFP+ socket into a guaranteed Gigabit port. Check the switch’s supported module and port-mode list.\u003c\/p\u003e\n\u003ch3\u003eService a Supported Powered Host\u003c\/h3\u003e\n\u003cp\u003eThe hot-pluggable design avoids a full switch shutdown for a supported module replacement. The affected optical link is interrupted while the module is removed. Use a maintenance window or a tested alternate path where service continuity matters.\u003c\/p\u003e\n\u003ch3\u003ePlan the Complete Optical Path\u003c\/h3\u003e\n\u003cp\u003eThe specified maximum reach is 550 m, subject to the correct fibre and link conditions. Connector loss, splices and patch panels contribute to the optical budget. Select both endpoints and test the completed link rather than treating distance alone as a compatibility check.\u003c\/p\u003e\n\u003ch3\u003eA Practical Component for Network Expansion\u003c\/h3\u003e\n\u003cp\u003eThe compact metal SFP housing provides a defined optical interface without dedicating an entire switch to one cable type. Label the link, protect fibre ends from contamination and follow laser-safety instructions. Keep unused connectors covered and inspect the optical path during commissioning.\u003c\/p\u003e\n\u003ch2\u003eSummary\u003c\/h2\u003e\n\u003cp\u003eThe DEM-311GT provides a 1000BASE-SX duplex LC connection for supported Gigabit equipment. Match the multi-mode fibre, far-end optics and host configuration, then validate the installed link before relying on its rated reach.\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\"\u003eWhich Fibre Type Does It Use?\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\u003eUse 50\/125 µm or 62.5\/125 µm multimode fibre with duplex LC connectors. Maximum reach is up to 550 m and depends on the fibre grade and optical path.\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\"\u003eIs It a Single-Fibre BiDi Module?\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 uses separate transmit and receive fibre paths through a duplex LC connector. A single-fibre BiDi pair is a different type of optical connection.\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 SFP Port?\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 universal compatibility is promised. Confirm the exact switch or network adapter, firmware and supported Gigabit port mode before installation.\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 Replaced While the Switch Is On?\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, in supported hot-pluggable equipment. The affected fibre link disconnects during replacement, so plan a suitable maintenance arrangement.\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 Patch Leads or a Second Module Included?\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 one transceiver. Fibre patch leads and the matching optical endpoint are selected separately for the complete link.\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 a 10G SFP+ Port Make This a 10G Module?\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 is a Gigabit module. The host must explicitly support the selected Gigabit module and operating mode, even if the socket also supports faster modules.\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":41567738101819,"sku":"DEM-311GT","price":50.34,"currency_code":"SGD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0557\/4541\/3179\/files\/d-link-dem-311gt-official-1.png?v=1793685682","url":"https:\/\/aceperipherals.com\/ko\/products\/d-link-dem-311gt","provider":"ACE Peripherals","version":"1.0","type":"link"}