With the development of high speed network, 10 gigabit switch is more and more popular in enterprise network. However, the compatibility between SFP and SFP+ has been confusing many users, such as whether the SFP+ port can support SFP optical module? Can the SFP port support SFP+ optical module? Can the SFP port on a gigabit switch be connected to the SFP+ port on a 10 gigabit switch? This article will reveal compatibility issues with SFP and SFP+ ports.
SFP+ 10G 1310nm 20KM
1.What is the SFP port on the gigabit switch?
As the transmission rate of an Ethernet switch changes, the port types of the switch also change, such as SFP port, SFP+ port, SFP28 port, QSFP+ port, and QSFP28 port. SFP port is a compact and hot-swappable network port. For Ethernet, the transmission rate is 1Gbit/s. For fiber channel systems, transmission rate can be up to 4Gbit/s. When the SFP optical modules are inserted into the SFP port of the gigabit switch with optical fiber patch cord or copper cable, different distances can be transmitted. For example, the maximum transmission distance of a gigabit single-mode optical module is 160 kilometers. The maximum transmission distance of a 1000Base-T SFP copper module is 100 meters when it is connected to CAT5E cables.
SFP 1.25G 1310nm 20KM
2.What is SFP+ port on the 10 Gigabit switch?
10 gigabit switches are classified into fiber channel switches and copper cable switches according to their port types. The 10 gigabit fiber channel switch is a switch with SFP+ ports. The appearance and size of the SFP+ port are the same as SFP ports. The biggest difference between them is the transmission rate of SFP+ port could be up to 10Gbit/s. Generally, 10 gigabit switches are equipped with higher-rate uplink ports, such as QSFP+ ports and QSFP28 ports, to facilitate the connection of higher-rate switches in the topology.
3.In most cases, SFP optical modules can be used in the SFP+ ports.
Can a 1G SFP optical module be inserted into a 10G SFP+ port? This is true in most cases, but if you insert an SFP optical module into an SFP+ port, the link transmission rate will drop to 1G, and some switches will lock the port at 1G until you reset the switch or run configuration commands. In addition, SFP+ ports generally cannot support rates below 1G. That is, 100BASE SFP optical module cannot be used in the SFP+ ports. In fact, this question depends largely on the switch itself, as some switches support it and some do not. At present, many 10 gigabit switches provided by suppliers can insert 10G SFP+ and 1G SFP optical modules into SFP+ ports (but the two cannot be used at the same time). Some 10 gigabit switches provided by some suppliers only support 10G SFP+ optical modules. Therefore, if you want to insert an SFP optical module into an SFP+ port on a 10 gigabit switch, consult your supplier to ensure that the SFP+ port on the 10 gigabit switch supports dual rates.
Package of SFP 1.25G 1310nm 20KM
4.In any case, the SFP+ optical module cannot be used in the SFP port.
Can I use a 10G SFP+ optical module in a 1G SFP port? The answer is definitely no. As is known to all, the rate of the optical module installed in the switch determines the rate of the port link. Most SFP+ ports in 10G switches are downward compatible with 1G SFP optical modules. However, 1G SFP ports in gigabit switches are not upward compatible, that is, they cannot support 10G SFP+ optical modules.
5.Whether the SFP port in a gigabit switch can be connected to the SFP+ port in a 10G switch or not?
Generally, the SFP+ port can support SFP optical modules and SFP+ optical modules, but the SFP port can only support SFP optical modules but cannot support SFP+ optical modules. Therefore, the connection between the two ends is classified as follows:
If SFP+ optical modules are used for SFP+ ports in a 10G switch and SFP optical modules are used for SFP ports in a 1G switch, the SFP+ ports in the 10G switch cannot be connected to the SFP ports in the 1G switch. Because the SFP+ optical module does not support auto-negotiation (auto-negotiation is based on electrical pulses rather than optical pulses and can only be implemented on twisted pair cables, not optical fibers) and cannot adjust the rate to 1 GB, this connection method is invalid.
When the SFP+ ports in the 10G switch use SFP optical modules and the SFP ports in the 1G switch use SFP optical modules, they could be connected. In this case, the link works properly and the link transmission rate is 1 Gbit/s.
To sum up, most SFP+ ports can support SFP optical modules, but SFP ports cannot support SFP+ optical modules. When the 1G SFP+ optical module is inserted into the SFP+ port in the 10G switch, the rate of the 10G SFP+ port is reduced to 1Gbit/s. That is, the SFP+ port in the 10G switch can be connected to the SFP port in the 1G switch, but the link transmission rate is 1Gbit/s. Therefore, in order to ensure normal network operation, the optical modules used at both ends must be compatible with each other.
TAG: 10G fs 10G SFP-1G-EX-40 J4858D Ethernet SFP-1G-EX-40 SFP-1G-SX-2 J4858D Ethernet SFP-1G-SX-2 J4858D SFP-1G-SX-2 SFP-1G-SX E1MG-40 extreme SFP-1G-SX 1G E1MG-40 extreme 1G E1MG-40 1G GLC-EX-SMD Aruba 40Gigabit GLC-EX-SMD huawei Aruba 40Gigabit huawei Aruba huawei Arista SFP-1G-EX-40 brocade Arista Ethernet SFP-1G-EX-40 brocade Ethernet SFP-1G-EX-40 Ethernet E1MG-LX-20 SFP-1G-SX
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