GLC-BX-U-20KM Cisco Compatible 1G SFP BiDi 20km SMF Transceiver

The GLC-BX-U-20KM is a 1G SFP optical transceiver compatible with Cisco platforms.

• Form Factor: SFP
• Data Rate: 1G
• Fiber Type: SMF
• Reach: 20km
• Connector: Simplex LC
• OEM Equivalent: GLC-BX-U-20KM

Compatibility: The GLC-BX-U-20KM-TFO is TenFour Optics' compatible equivalent of the Cisco GLC-BX-U-20KM, coded per order for Cisco platforms. Cisco lists the GLC-BX-U-20KM for use in 1G SFP ports on: ASR 9000 Series, ASR 920 Series, Catalyst 1000 Series, Catalyst 9200 Series, Catalyst 9300 Series, Catalyst 9400 Series, ISR 4000 Series, NCS 540 Series, and Nexus 9300 Series. To confirm fit for a specific line card or OS release, email 10.4@tenfouroptics.com.

Pairs with: GLC-BX-D-20KM — BiDi runs over a single fiber strand; this U unit pairs with one D unit at the far end.

Tested & Proven: Every TenFour Optics part is coded, tested, and verified before shipment — see Tested & Proven.

OEM-compatible and MSA-compliant. Compliance documentation (RoHS declaration, IEC 60825-1 laser classification) is available on request for project quotes. Digital Diagnostic Monitoring (DDM/DOM) supported. Every module is tested for traffic conformity per supported layer 2/3 protocols, DOM threshold verification, EEPROM/MSA value verification, serial number verification, and optical cleanliness before shipment.

Backed by the GreenLights4Life® Limited Lifetime Replacement Warranty. In-stock items ship same or next business day.