What is a composite port?
Combined port, also known as optical multiplexer interface, a combined port corresponds to an RJ45 port and a SFP port on the device panel, while there is only one forwarding interface inside the device. It can support different interface types, such as RJ45 port or SFP port, without changing the structure and number of ports of the switch. However, two different ports cannot be used at the same time. That is, when the RJ45 port is activated, the SFP port is automatically disabled, and vice versa.
Generally, the RJ45 port is connected by twisted pair, while the SFP port requires high-speed cables or optical modules and jumpers. The use of composite ports makes the network more flexible without taking up too much space.
Combined port type
Combination port is divided into two types, single combination port and double combination port, which can be used to simplify network management.
Single combined port
A single combined port is a view of two ports on the switch equipment panel corresponding to the same port. Users can switch between two ports in the same port view. A single combined interface can be a layer 2 or layer 3 Ethernet interface.
Dual combination port
Dual combined ports are two Ethernet interfaces on the switch equipment panel, corresponding to two different port views. Users can switch the working state of the two ports on the optical port or electrical port view. Dual combination interface can only be layer 2 Ethernet interface.
SFP port
SFPs are commonly used in switches, routers, media converters and other network devices. Do you really know about SFPs? The main function of the SFP port is for signal conversion and data transmission. Its port conforms to IEEE 802.3ab standard (such as 1000BASE-T), and the maximum transmission distance can reach 1000 Mbps (the SFP port of the switch supports 100 / 1000 Mbps).
As a hot swap I / O interface (I / O interface), it has strong flexibility and is suitable for a variety of products. For example, it can exchange with ports of 1000base-sx, 1000base-lx / LH, 1000base-zx or 1000base-bx10-d / u. in addition, it can be downward compatible and support 10 / 100 / 1000Mbps.
The GBP port of Gigabit switch can be used to expand the switching function of the whole network by connecting various types of optical fibers (such as single-mode and multi-mode optical fibers) and network jumpers. However, the GBP port of Gigabit switch must be inserted into the optical module before use, and then the optical fiber jumpers and network jumpers are used for data transmission. Nowadays, all enterprise switches in the market have at least two SFPs, which can be used to build ring or star network topology between different buildings, floors or areas through the connection of optical fiber, network jumper and other cables.
What is the difference between a composite port and an SFP port?
The combination interface is composed of electric port and optical port. The electric port and its corresponding optical port are optoelectronic multiplexed logically. The user can choose one of them according to the actual networking situation, but they can't work at the same time. When one of the interfaces is activated, the other interface will be automatically disabled. RJ45 port is usually used to connect switches less than 100m apart, while SFP port can realize long transmission distance according to fiber type. You can choose to use electric port or optical port according to the actual network demand.
The SFP port (small hot pluggable interface), also known as mini GBIC port, has a transmission rate of 1G and can support copper link or optical link. When the electrical interface module is inserted into the SFP port, the network cable (CAT5 / CAT5e / CAT6) is usually used to connect it for data transmission. When the optical port module is inserted into the SFP port, LC jumper is needed to realize longer distance transmission.
Rules for using composite ports
1. The optical port or electrical port of the combined port cannot be used at the same time. When the electrical port is activated, the optical port will be automatically disabled.
2. Connect the SFPs of RJ45 port and combination port to the network device, and the SFPs will be enabled first.
3. The SFPs of RJ45 port and combination port use the same settings, such as VLAN assignment, access control list and spanning tree.
For the combined port on Ethernet switch, it needs to be emphasized again that optical port and electrical port cannot be used at the same time. Typically, the vendor marks the combined port on the switch. If not, the combined port can be identified according to the interface identification on the switch panel. If two ports have the same ID but can be connected to different transmission media, they will be photoelectric multiplexing ports. Through the above description, I hope you have a general understanding of the combined port on the switch.
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