1000BASE-LX SFP 20km Extended Transceiver: 1.25G-SFP-20D
1.25G 1000BASE-LX 20 km SFP Overview
The EdgeOptic 1.25G-SFP-20D is a 1000BASE-LX-compatible 1.25G SFP transceiver delivering Gigabit Ethernet and 1G Fibre Channel reach across single-mode fiber. The module operates at 1310 nm with FP-laser transmission and PIN-photodiode reception, carries a 15 dB link budget, and is rated to 20 km of duplex SMF using LC/UPC connectors. DDM/DOM, INF-8074i SFP MSA conformance, and Class 1 laser safety compliance make it a drop-in optic for service-provider access rings, campus backbone extensions, and enterprise WAN links.
- Media Type: Single-Mode Fiber (SMF)
- Fiber Count: Duplex
- Connector: Double LC/UPC
- Maximum Distance: 20 km
- Average Link Budget: 15 dB
- Tx Wavelength: 1310 nm
- Supported Data Rate: 1.063 Gbps - 1.25 Gbps
- DDM/DOM: Supported
- Temperature Range: Standard 0°-70°C
1000BASE-EX 20km Pricing
SKU:1.25G-SFP-20D
In Stock - Ships Next Business Day1000BASE-LX SFP 20km Extended Transceiver Specification
Form Factor | SFP |
Media Type | Single-Mode Fiber (SMF) |
Fiber Count | Duplex |
Connector | Double LC/UPC |
Maximum Distance | 20 km |
Average Link Budget | 15 dB |
TX Wavelength | 1310 nm |
RX Wavelength | 1310 nm |
Supported Data Rate | 1.063 Gbps - 1.25 Gbps |
Supported Ethernet Applications | Gigabit Ethernet (1.25 Gbps) |
Supported Fiber Channel Applications | 1G Fiber Channel (1.0625 Gbps) |
DDM/DOM | Supported |
Tx Wavelength Bandwidth | 100 nm (1260-1360 nm) |
Rx Wavelength Bandwidth | 100 nm (1260-1360 nm) |
Minimum Transmitting Power | -9 dBm |
Maximum Transmitting Power | -3 dBm |
Receiver Sensitivity | -24 dBm |
Receiver Overload | -3 dBm |
Dispersion | 140-160 ps/nm ps/nm |
Transmitter Type | FP Laser |
Receiver Type | PIN photodiode |
Temperature Range | Standard 0°-70°C |
Power | +3.3V single power supply |
Compliance | CE, Class 1 FDA and IEC60825-1 Laser Safety Compliant, INF-8074i, RoHS, SFP MSA |
1000BASE-LX SFP 20km Extended Transceiver Datasheet
v2Complete technical specifications and product details
1000BASE-LX SFP 20km Extended Transceiver Description
The EdgeOptic 1.25G-SFP-20D is a 1000BASE-LX-class SFP transceiver delivering 1.25 Gbps Gigabit Ethernet and 1.0625 Gbps 1G Fibre Channel across 20 km of duplex single-mode fiber. The module operates at 1310 nm, uses an FP-laser transmitter and a PIN-photodiode receiver, and presents a duplex LC/UPC optical interface in the standard SFP form factor.
Transmit power lands between −9 dBm and −3 dBm, receive sensitivity is −24 dBm, and receiver overload is rated at −3 dBm, yielding a 15 dB link budget across the 1260 to 1360 nm wavelength window. DDM/DOM diagnostics expose transmit and receive power, module temperature, bias current, and supply voltage over the standard MSA EEPROM interface. The optic conforms to INF-8074i and SFP MSA on the host side, runs from a single +3.3 V rail, and carries CE, RoHS, and Class 1 laser safety (FDA and IEC 60825-1) compliance. IEEE 802.3z Clause 38 covers the 1000BASE-LX Gigabit Ethernet PHY; the 20 km reach is a vendor-extended figure beyond the 5 km IEEE-defined SMF distance for 1000BASE-LX.
Typical applications include metropolitan-area networks, service-provider access rings, campus backbone extensions between buildings, and Gigabit Ethernet links that need to bridge the gap between the standard 1000BASE-LX class and 40 km long-reach optics. Gigabit Ethernet and 1G Fibre Channel are the rated transport protocols; SONET, SDH, and OTN framing are out of scope for this module class.
The 1.25G-SFP-20D is EdgeOptic's standard 1000BASE-LX 20 km SFP. A single physical optic is coded across multiple vendor EEPROMs so the same module qualifies on Cisco, HPE Aruba, Juniper, Brocade, Hirschmann, Dell, Planet, Check Point, Lenovo, Ruijie, and other SFP MSA host systems. Each vendor SKU mapping has its own product page; the host-equipment ordering code differs, the optic specification underneath does not.
Backed by 15+ years of EdgeOptic compatibility engineering across vendor optical platforms. The 1.25G-SFP-20D ships next business day from EU stock with a lifetime warranty. For volume pricing, vendor-coding requests, or compatibility questions, contact our sales team.
Frequently Asked Questions
Is the 1.25G-SFP-20D a 1000BASE-LX or 1000BASE-EX module?
It is a 1000BASE-LX-class 20 km extended-reach SFP at 1310 nm. IEEE 802.3z Clause 38 defines 1000BASE-LX as the 1 Gbps long-wavelength PHY and is the standard this module complies with. 1000BASE-EX is not an IEEE 802.3z designation; the industry typically uses EX informally for 40 km optics such as the Cisco GLC-EX-SMD. The 1.25G-SFP-20D is the 20 km variant of the LX class, not a 40 km EX optic. Verify against the chassis transceiver compatibility table before ordering if the host platform requires a specific reach class.
Will the 1.25G-SFP-20D work on Cisco, Juniper, or HPE switches that enforce vendor EEPROM checks?
Yes. The 1.25G-SFP-20D is delivered with the vendor-specific EEPROM coding requested at order: Cisco-coded units carry Cisco-recognized identifier strings so Catalyst, Nexus, and IOS XE platforms accept them without the service unsupported-transceiver workaround; Juniper-coded units are recognized by Junos; HPE Aruba-coded units satisfy ArubaOS-Switch and ArubaOS-CX transceiver checks. Specify the host platform on the order and the optic ships with matching EEPROM. For multi-vendor purchase orders, separate vendor-coded SKUs are available; verify the target host compatibility matrix when placing the order.
Where does the 20 km reach figure come from if IEEE 802.3z specifies 5 km for 1000BASE-LX over SMF?
The 20 km figure is the rated module reach derived from the optical link budget, not the IEEE 802.3z distance for 1000BASE-LX. IEEE 802.3z Clause 38 specifies up to 5 km of SMF for the standard 1000BASE-LX PHY at 1310 nm. The 1.25G-SFP-20D extends that reach to 20 km through a higher guaranteed minimum transmit power and a more sensitive receiver: TX of −9 to −3 dBm, RX sensitivity of −24 dBm, for 15 dB of link budget. Engineers planning a 20 km span should still verify their total path loss (including splice loss, connector loss, and fiber attenuation) against that 15 dB budget rather than assume worst-case headroom.