{"product_id":"tp-link-tl-sm321a-2-gigabit-wdm-sfp-module-tx1550-rx1310-2km","title":"TP-Link TL-SM321A-2 Gigabit WDM Bi-Directional SFP Module | TX 1550nm \/ RX 1310nm | 2km SMF","description":"\u003ch2\u003eTP-Link TL-SM321A-2 Gigabit WDM Bi-Directional SFP Module\u003c\/h2\u003e\n\n\u003cp\u003eThe TP-Link TL-SM321A-2 is a 1000Base-BX WDM (Wavelength Division Multiplexing) bi-directional SFP module that transmits and receives over a single strand of single-mode fibre. With a TX wavelength of 1550nm and RX of 1310nm, it pairs with the complementary TL-SM321B-2 (TX 1310nm \/ RX 1550nm) to deliver full-duplex Gigabit connectivity over just one fibre run — halving your cabling costs on point-to-point links up to 2km.\u003c\/p\u003e\n\n\u003ch2\u003eKey Features\u003c\/h2\u003e\n\u003cul\u003e\n  \u003cli\u003e1000Base-BX WDM BiDi — full-duplex Gigabit over a single fibre strand\u003c\/li\u003e\n  \u003cli\u003eTX: 1550nm \/ RX: 1310nm — pairs with TL-SM321B-2 at the remote end\u003c\/li\u003e\n  \u003cli\u003eUp to 2km transmission distance over 9\/125μm single-mode fibre (SMF)\u003c\/li\u003e\n  \u003cli\u003eLC Simplex connector — standard, widely available termination\u003c\/li\u003e\n  \u003cli\u003eDigital Diagnostic Monitoring (DDM) — real-time optical performance visibility\u003c\/li\u003e\n  \u003cli\u003eHot-swappable — insert or remove without powering down the host device\u003c\/li\u003e\n  \u003cli\u003eSFP-MSA compliant — compatible with most SFP-capable switches and media converters\u003c\/li\u003e\n  \u003cli\u003e1.25Gbps data rate, 3.3V power supply\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch2\u003eUse Cases\u003c\/h2\u003e\n\u003cul\u003e\n  \u003cli\u003e\n\u003cstrong\u003ePoint-to-point fibre links\u003c\/strong\u003e — connect two switches or media converters over a single SMF strand, saving one fibre run per link\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eSecurity and surveillance networks\u003c\/strong\u003e — extend Gigabit connectivity between buildings or floors where copper cabling is impractical\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eCampus and enterprise networks\u003c\/strong\u003e — cost-effective fibre uplinks where existing single-strand fibre infrastructure is already in place\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eISP and telco last-mile\u003c\/strong\u003e — BiDi SFPs are commonly used in FTTN and point-to-point fibre distribution applications\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch2\u003eSpecifications\u003c\/h2\u003e\n\u003ctable style=\"width:100%;border-collapse:collapse;\"\u003e\n  \u003cthead\u003e\n    \u003ctr style=\"background-color:#f2f2f2;\"\u003e\n      \u003cth style=\"text-align:left;padding:8px;border:1px solid #ddd;\"\u003eSpecification\u003c\/th\u003e\n      \u003cth style=\"text-align:left;padding:8px;border:1px solid #ddd;\"\u003eDetail\u003c\/th\u003e\n    \u003c\/tr\u003e\n  \u003c\/thead\u003e\n  \u003ctbody\u003e\n    \u003ctr\u003e\n      \u003ctd style=\"padding:8px;border:1px solid #ddd;\"\u003eModel\u003c\/td\u003e\n      \u003ctd style=\"padding:8px;border:1px solid #ddd;\"\u003eTL-SM321A-2\u003c\/td\u003e\n    \u003c\/tr\u003e\n    \u003ctr style=\"background-color:#f9f9f9;\"\u003e\n      \u003ctd style=\"padding:8px;border:1px solid #ddd;\"\u003eStandard\u003c\/td\u003e\n      \u003ctd style=\"padding:8px;border:1px solid #ddd;\"\u003e1000Base-BX (IEEE 802.3z), TCP\/IP\u003c\/td\u003e\n    \u003c\/tr\u003e\n    \u003ctr\u003e\n      \u003ctd style=\"padding:8px;border:1px solid #ddd;\"\u003eTX Wavelength\u003c\/td\u003e\n      \u003ctd style=\"padding:8px;border:1px solid #ddd;\"\u003e1550nm\u003c\/td\u003e\n    \u003c\/tr\u003e\n    \u003ctr style=\"background-color:#f9f9f9;\"\u003e\n      \u003ctd style=\"padding:8px;border:1px solid #ddd;\"\u003eRX Wavelength\u003c\/td\u003e\n      \u003ctd style=\"padding:8px;border:1px solid #ddd;\"\u003e1310nm\u003c\/td\u003e\n    \u003c\/tr\u003e\n    \u003ctr\u003e\n      \u003ctd style=\"padding:8px;border:1px solid #ddd;\"\u003eData Rate\u003c\/td\u003e\n      \u003ctd style=\"padding:8px;border:1px solid #ddd;\"\u003e1.25Gbps\u003c\/td\u003e\n    \u003c\/tr\u003e\n    \u003ctr style=\"background-color:#f9f9f9;\"\u003e\n      \u003ctd style=\"padding:8px;border:1px solid #ddd;\"\u003eMax. Cable Length\u003c\/td\u003e\n      \u003ctd style=\"padding:8px;border:1px solid #ddd;\"\u003e2km\u003c\/td\u003e\n    \u003c\/tr\u003e\n    \u003ctr\u003e\n      \u003ctd style=\"padding:8px;border:1px solid #ddd;\"\u003eFibre Type\u003c\/td\u003e\n      \u003ctd style=\"padding:8px;border:1px solid #ddd;\"\u003e9\/125μm Single-Mode Fibre (SMF)\u003c\/td\u003e\n    \u003c\/tr\u003e\n    \u003ctr style=\"background-color:#f9f9f9;\"\u003e\n      \u003ctd style=\"padding:8px;border:1px solid #ddd;\"\u003eConnector\u003c\/td\u003e\n      \u003ctd style=\"padding:8px;border:1px solid #ddd;\"\u003eLC Simplex\u003c\/td\u003e\n    \u003c\/tr\u003e\n    \u003ctr\u003e\n      \u003ctd style=\"padding:8px;border:1px solid #ddd;\"\u003eDDM\u003c\/td\u003e\n      \u003ctd style=\"padding:8px;border:1px solid #ddd;\"\u003eSupported\u003c\/td\u003e\n    \u003c\/tr\u003e\n    \u003ctr style=\"background-color:#f9f9f9;\"\u003e\n      \u003ctd style=\"padding:8px;border:1px solid #ddd;\"\u003eHot Swappable\u003c\/td\u003e\n      \u003ctd style=\"padding:8px;border:1px solid #ddd;\"\u003eYes\u003c\/td\u003e\n    \u003c\/tr\u003e\n    \u003ctr\u003e\n      \u003ctd style=\"padding:8px;border:1px solid #ddd;\"\u003eSFP-MSA Compliant\u003c\/td\u003e\n      \u003ctd style=\"padding:8px;border:1px solid #ddd;\"\u003eYes\u003c\/td\u003e\n    \u003c\/tr\u003e\n    \u003ctr style=\"background-color:#f9f9f9;\"\u003e\n      \u003ctd style=\"padding:8px;border:1px solid #ddd;\"\u003ePower Supply\u003c\/td\u003e\n      \u003ctd style=\"padding:8px;border:1px solid #ddd;\"\u003e3.3V\u003c\/td\u003e\n    \u003c\/tr\u003e\n    \u003ctr\u003e\n      \u003ctd style=\"padding:8px;border:1px solid #ddd;\"\u003eOperating Temperature\u003c\/td\u003e\n      \u003ctd style=\"padding:8px;border:1px solid #ddd;\"\u003e0–70°C\u003c\/td\u003e\n    \u003c\/tr\u003e\n    \u003ctr style=\"background-color:#f9f9f9;\"\u003e\n      \u003ctd style=\"padding:8px;border:1px solid #ddd;\"\u003eStorage Temperature\u003c\/td\u003e\n      \u003ctd style=\"padding:8px;border:1px solid #ddd;\"\u003e-40–85°C\u003c\/td\u003e\n    \u003c\/tr\u003e\n    \u003ctr\u003e\n      \u003ctd style=\"padding:8px;border:1px solid #ddd;\"\u003eOperating Humidity\u003c\/td\u003e\n      \u003ctd style=\"padding:8px;border:1px solid #ddd;\"\u003e10–90% RH, Non-Condensing\u003c\/td\u003e\n    \u003c\/tr\u003e\n    \u003ctr style=\"background-color:#f9f9f9;\"\u003e\n      \u003ctd style=\"padding:8px;border:1px solid #ddd;\"\u003eCertifications\u003c\/td\u003e\n      \u003ctd style=\"padding:8px;border:1px solid #ddd;\"\u003eFCC, CE\u003c\/td\u003e\n    \u003c\/tr\u003e\n    \u003ctr\u003e\n      \u003ctd style=\"padding:8px;border:1px solid #ddd;\"\u003eSKU \/ Barcode\u003c\/td\u003e\n      \u003ctd style=\"padding:8px;border:1px solid #ddd;\"\u003eTL-SM321A-2 \/ 6935364072933\u003c\/td\u003e\n    \u003c\/tr\u003e\n    \u003ctr style=\"background-color:#f9f9f9;\"\u003e\n      \u003ctd style=\"padding:8px;border:1px solid #ddd;\"\u003eWeight\u003c\/td\u003e\n      \u003ctd style=\"padding:8px;border:1px solid #ddd;\"\u003e0.06kg\u003c\/td\u003e\n    \u003c\/tr\u003e\n  \u003c\/tbody\u003e\n\u003c\/table\u003e\n\n\u003ch2\u003ePairing Note\u003c\/h2\u003e\n\u003cp\u003eThe TL-SM321A-2 (TX 1550nm \/ RX 1310nm) must be paired with the \u003cstrong\u003eTL-SM321B-2\u003c\/strong\u003e (TX 1310nm \/ RX 1550nm) at the opposite end of the fibre link. Using two modules of the same type will not establish a connection.\u003c\/p\u003e\n\n\u003ch2\u003eFrequently Asked Questions\u003c\/h2\u003e\n\n\u003ch3\u003eWhat is a BiDi SFP module?\u003c\/h3\u003e\n\u003cp\u003eA BiDi (bi-directional) SFP uses WDM technology to transmit and receive on different wavelengths over a single fibre strand. This allows a full-duplex Gigabit link using only one fibre run instead of two, reducing cabling costs and simplifying infrastructure.\u003c\/p\u003e\n\n\u003ch3\u003eWhat module do I need at the other end?\u003c\/h3\u003e\n\u003cp\u003eYou must use the complementary \u003cstrong\u003eTL-SM321B-2\u003c\/strong\u003e (TX 1310nm \/ RX 1550nm) at the remote end. The wavelengths must be opposite — one end transmits at 1550nm while the other receives at 1550nm, and vice versa.\u003c\/p\u003e\n\n\u003ch3\u003eIs the TL-SM321A-2 compatible with third-party switches?\u003c\/h3\u003e\n\u003cp\u003eYes. The TL-SM321A-2 is SFP-MSA compliant, meaning it is designed to work with any switch or media converter that accepts standard SFP modules. Compatibility with specific third-party devices should be verified with the switch manufacturer.\u003c\/p\u003e\n\n\u003ch3\u003eWhat does DDM (Digital Diagnostic Monitoring) do?\u003c\/h3\u003e\n\u003cp\u003eDDM allows you to monitor real-time optical parameters — such as TX power, RX power, temperature, and voltage — directly from a compatible switch’s management interface. This is useful for diagnosing fibre link issues without physical inspection.\u003c\/p\u003e\n\n\u003ch3\u003eCan I hot-swap this module?\u003c\/h3\u003e\n\u003cp\u003eYes. The TL-SM321A-2 is hot-swappable, so you can insert or remove it from a compatible SFP port without powering down the host switch or device.\u003c\/p\u003e\n\n\u003ch3\u003eDoes it ship Australia-wide?\u003c\/h3\u003e\n\u003cp\u003eYes. CCTV Guru ships the TL-SM321A-2 Australia-wide from local stock.\u003c\/p\u003e","brand":"TP-Link","offers":[{"title":"Default Title","offer_id":43198325194981,"sku":"TL-SM321A-2","price":27.0,"currency_code":"AUD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0637\/1554\/1221\/files\/tp-link-omada-sm321a-2-1000base-bx-wdm-bi-directional-sfp-module.webp?v=1779512396","url":"https:\/\/cctvguru.com.au\/products\/tp-link-tl-sm321a-2-gigabit-wdm-sfp-module-tx1550-rx1310-2km","provider":"CCTV Guru","version":"1.0","type":"link"}