{"product_id":"for-cisco-glc-bx-u-and-glc-bx-d-1-25g-sfp-bidi-transceiver-10-20km","title":"for Cisco GLC-BX-U and GLC-BX-D 1.25G SFP BIDI Transceiver - 10-20KM","description":"\u003cp\u003eIn this review of the for Cisco GLC-BX-U and GLC-BX-D 1.25G SFP BIDI Transceiver, the bottom line is simple: this module is for network engineers and IT teams that need a reliable, carrier-class bidirectional SFP to extend Gigabit links over single fiber up to 20km. The reviewer found the module delivers the expected compatibility for Cisco GLC-BX-U and GLC-BX-D coded ports, with the key advantage being tested interoperability from Jeirdus compatibility lab and full warranty support. For anyone replacing or upgrading SFPs in Cisco switches, the transceiver offers a low-risk, plug-and-play replacement option.\u003c\/p\u003e\u003ch2\u003eKey Features\u003c\/h2\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eCisco compatibility:\u003c\/strong\u003e Fully compatible with Cisco GLC-BX-U and GLC-BX-D coding so it installs and registers on compatible switch ports without manual configuration.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eBidirectional 1.25Gb\/s:\u003c\/strong\u003e Supports 1000BASE-BX-U and 1000BASE-BX-D bidirectional links to carry Gigabit Ethernet over a single LC fiber, reducing cabling complexity.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSingle LC simplex:\u003c\/strong\u003e Uses a single LC connector and pair configuration to run transmit and receive on separate wavelengths, saving fiber infrastructure costs.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eUp to 20km reach:\u003c\/strong\u003e Designed to span up to 20km, making it suitable for campus links and short metro runs where higher-range optics are not required.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eTested quality and warranty:\u003c\/strong\u003e Each transceiver is individually tested in Jeirdus labs and ships with CE and FCC compliance plus replacement support and lifetime warranty coverage.\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch2\u003eWho It's For\u003c\/h2\u003e\u003cp\u003eThis module is aimed at IT professionals, systems integrators, and network administrators who run Cisco switches or routers and need an economical, compatible SFP option for single-fiber Gigabit links. It is especially useful when a site requires bidirectional WDM to conserve fiber or when replacement of failed SFPs must match Cisco coding to avoid interoperability issues.\u003c\/p\u003e\u003cp\u003eThose who should look elsewhere include teams that require multimode fibers, faster than 1.25Gb\/s speeds, or distances beyond 20km; in those cases, different transceiver classes or single-mode wavelengths better suited to long-haul or higher-bandwidth applications are recommended.\u003c\/p\u003e\u003ch2\u003ePros \u0026amp; Cons\u003c\/h2\u003e\u003cp\u003e\u003cstrong\u003ePros\u003c\/strong\u003e\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003eProven compatibility with Cisco GLC-BX-U and GLC-BX-D coded ports for straightforward deployment.\u003c\/li\u003e\n\u003cli\u003eBidirectional 1000BASE-BX operation over a single LC saves fiber and simplifies cabling.\u003c\/li\u003e\n\u003cli\u003eEach unit is individually tested and backed by CE, FCC compliance and warranty support.\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003e\u003cstrong\u003eCons\u003c\/strong\u003e\u003c\/p\u003e\u003cul\u003e\u003cli\u003eLimited to 1.25Gb\/s and up to 20km, so it is not suitable for higher-speed or longer-distance needs.\u003c\/li\u003e\u003c\/ul\u003e\u003ch2\u003eSpecifications\u003c\/h2\u003e\u003ctable\u003e\n\u003ctr\u003e\n\u003ctd\u003eForm Factor\u003c\/td\u003e\n\u003ctd\u003eSFP (1.25Gb\/s BIDI)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eCompatibility\u003c\/td\u003e\n\u003ctd\u003eCompatible with Cisco GLC-BX-U and GLC-BX-D\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eStandards\u003c\/td\u003e\n\u003ctd\u003e1000BASE-BX-U and 1000BASE-BX-D\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eConnector\u003c\/td\u003e\n\u003ctd\u003eSingle LC simplex\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eWavelengths\u003c\/td\u003e\n\u003ctd\u003eUp: TX 1310nm \/ RX 1550nm; Down: TX 1550nm \/ RX 1310nm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eDistance\u003c\/td\u003e\n\u003ctd\u003eUp to 20km\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eCertifications\u003c\/td\u003e\n\u003ctd\u003eCE, FCC\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/table\u003e\u003ch2\u003eOur Verdict\u003c\/h2\u003e\u003cp\u003eThe Jeirdus for Cisco GLC-BX-U and GLC-BX-D 1.25G SFP BIDI Transceiver is a practical, cost-effective replacement for Cisco-coded ports when you need single-fiber Gigabit links up to 20km. It is good value for network teams who prioritize tested compatibility and warranty coverage, but it is not intended for higher speeds or long-haul deployments.\u003c\/p\u003e\u003ch2\u003eFrequently Asked Questions\u003c\/h2\u003e\u003cp\u003e\u003cstrong\u003eWill this module work in Cisco switches?\u003c\/strong\u003e\u003cbr\u003eYes, it is coded for and compatible with Cisco GLC-BX-U and GLC-BX-D ports and is tested by Jeirdus compatibility lab.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat range does the transceiver support?\u003c\/strong\u003e\u003cbr\u003eThe module supports up to 20km over single-mode fiber using simplex LC and bidirectional wavelengths.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eIs there warranty and testing?\u003c\/strong\u003e\u003cbr\u003eEach unit is individually tested before delivery and ships with CE and FCC compliance plus replacement support and lifetime warranty.\u003c\/p\u003e","brand":"Jeirdus","offers":[{"title":"Default Title","offer_id":48177348968667,"sku":"B07D5FL148","price":35.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0724\/1043\/1707\/files\/51jXZElYNkL._AC_62803ce2-5194-4d3a-b8b5-ab7f41f262ed.jpg?v=1769522671","url":"https:\/\/gearmusthave.com\/products\/for-cisco-glc-bx-u-and-glc-bx-d-1-25g-sfp-bidi-transceiver-10-20km","provider":"GearMustHave","version":"1.0","type":"link"}