The GLC-BX-U-20KM-OO is compatible with Cisco GLC-BX-U-20KM. This 1000BASE-BX SFP product supports 1G links up to 20KM over single-mode fiber. It uses 1310nm TX / 1490nm RX and a Simplex LC interface and supports digital optical monitoring. ✓ Coded In-House - programmed for the specified compatibility✓ Tested In-House - tested for the specified compatibility✓ Warrantied - Lifetime warranty Technical Specification Compatibility Compatible with Cisco OEM Part Number GLC-BX-U-20KM OEM Orderable Number N/A Connector Type Simplex LC DOM Yes Form Factor SFP Media Type SMF Maximum Link Length 20KM Speed 1G Interface Standard 1000BASE-BX Wavelength 1310nm TX / 1490nm RX Optical Specification Optical Standard 1000BASE-BX Fiber Type SMF Nominal Wavelength 1310nm TX / 1490nm RX Maximum Reach 20KM Physical Specification Product Shipping Dimensions (HxWxD) 1.2 in. x 2.75 in. x 4.75 in. Product Shipping Weight (lb) 0.4 Operating Temperature 0 to 70°C (commercial) Laser Class Class 1 Miscellaneous ECCN 5A991 HTS Code (US) 8517.62.0090 What's Included 1x transceiver Cisco® is a registered trademark of its respective owner. OEM Optic is not affiliated with, endorsed by, or sponsored by Cisco. This is a third-party compatible product.