08 Mar 10GBASE-USR SFP+ – Cisco FET-10G, Huawei SFP-10G-USR and Juniper EX-SFP-10GE-USR Story
10GBASE-USR SFP+ are transceivers designed for Ultra-Short Reach distance (up to 100m) used for 10G Ethernet application and housed in SFP+ form-factor. Although this sounds very new, these transceivers are based on the good old 10G SFP+ SR [10G-SFP-300], 10Gbase-SR Optical Transceiver designed to work over Multimode Fiber (MMF) with Double LC Connectors with 10G Ethernet (10.31Gbps) and Gigabit Ethernet (1.25 Gbps) application support all according to SFP+ Multi Source Agreement SFF-8431, industry standard. Let’s take a closer look on 10GBASE-USR SFP+ and 3 well known brands Cisco, Huawei and Juniper versions of this product – Cisco FET-10G, Huawei SFP-10G-USR and Juniper EX-SFP-10GE-USR.
10GBASE-USR SFP+ can be connected to any 10GBASE SR SFP+ (10G-SFP-300) by default. 10GBASE-USR SFP+ is different from 10G SFP+ SR by being made for 100m distance. USR SFP+ utilizes the same 850 nm laser – VSCEL and 850 nm photodiode – PIN. However the USR is all about saving power, that is why VSCEL uses transmits (Tx) with less optical power and PIN has a higher receiver (Rx) sensitivity.
CISCO FET-10G – Fabric Extender Transceiver that is for distance of up to 100m and laser-optimized for OM3 or OM4 multimode fiber. FET-10G can be used for the Nexus product family, starting from model Nexus 2000. For other platforms SFP-10G-SR or SFP-10G-SR-S should be used as substitute.
Juniper EX-SFP-10GE-USR [740-030658] – SFP+ 10 Gigabit Ethernet Ultra Short Reach transceiver that is for distance of up to 100m and laser-optimized for OM3 or OM4 multimode fiber. EX-SFP-10GE-USR can be used in most Juniper Junos OS equipment for Routing, Software Defined Networking and Switching platforms.
Huawei Gigabit Ethernet 10GBASE-USR compliant transceiver that is for distance of up to 100m and laser-optimized for OM3 or OM4 multimode fiber. SFP-10G-USR can be used and is supported in CloudEngine 9800, 8800, 7800, 6800, and 5800 Series Switches that have V100R002C00 and later versions.
10GBASE-USR SFP+ made by CISCO, Juniper and Huawei comparing with EDGE 10G SR (10G-SFP-300) can be seen in 10GBASE-USR SFP+ Parameters table located below:
|10GBASE-USR SFP+ Parameters||Paramaters||10G-SFP-300||FET-10G||EX-SFP-10GE-USR||SFP-10G-USR|
|Supported Data Rate:||1.25-10.31 Gbps||10 Gbps||10 Gbps||10 Gbps|
|Media Type:||OM3, OM4||OM3, OM4||OM3, OM4||OM3, OM4|
|Connectors:||Double LC||Double LC||Double LC||Double LC|
|TX Wavelength:||850 nm||850 nm||850 nm||850 nm|
|RX Wavelength:||850 nm||850 nm||850 nm||850 nm|
|Minimum Transmitting Power:||-6.5 dB||-7.3 dBm||-8.0 dBm||-7.3 dBm|
|Maximum Transmitting Power:||1.0 dB||-1.3 dBm||-1.3 dBm||-1.0 dBm|
|Receiver Sensitivity:||-11.1 dBm||-11.1 dBm||-9.9 dBm||-10.7 dBm|
|Receiver Overload:||-1.0 dBm||-1.0 dBm||-1.0 dBm||-1.0 dBm|
10GBASE-USR SFP+ modules Juniper EX-SFP-10GE-USR, Cisco FET-10G and Huawei SFP-10G-USR parameters are almost the same as EDGE Optical Solutions product 10G-SFP-300. This shows that 10GBASE-USR SFP+ modules can be used together with mainstream 10GBASE-SR SFP+ modules without causing damage to each other.
The 10GBASE-USR SFP+ modules is an interesting option when compared to the 10GBASE-SR SFP+. However, 10GBASE-SR SFP+ can provide full substitution for 10GBASE-USR SFP+ (Ultra Short Reach) and is the go to option for industry. 10GBASE-SR has the added benefit – the ability to provide up to 300 meters connection over OM3 Multimode fiber and up to 400 meters connections over OM4/OM5 Multimode fiber.
10GBASE-USR SFP+ has been designed to cover 100 meters but it does not have significant bonuses over 10GBASE-SR SFP+ (10G-SFP-300) as seen in 10GBASE-USR SFP+ Parameters table.
That is why 10GBASE-SR SFP+ (10G-SFP-300) is the product to use when 10G Multimode connections needs to be made.
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