- DDM, DOM, RGD-What functons do they represent?
DDM, DOM and RGD are common in SFP transceiver names, which make users confused. In fact, DDM (Digital Diagnostics Monitoring) is a technology which enables users to monitor real-time parameters in SFP modules like input power, output power and temperature. DOM (digital optical monitoring) is similar to DDM, allowing users to monitor parameters of the SFP transceiver. RGD means the SFP is a “rugged” grade transceiver that is well fit for industrial networking applications such as manufacturing automation, substations and smart transport systems.
- What’s the difference between singlemode SFP and multimode SFP?
There are three main differences between singlemode SFP (SMF SFP) and multimode SFP (MMF SFP). The first one is the fiber cable used with them. Singlemode fiber has a smaller core than multimode fiber, and it allows unlimited bandwidth and lower loss. While multimode fiber can propagate multiple modes of light. The second one is the transmission distance. Singlemode SFP transceiver is often used in long-run links up to 120km, but multimode SFP module is used in short applications. The last one is the cost. Singlemode SFP is more expensive than multimode SFP due to the use of different light emitting unit.
- What’s the difference between SFP and SFP+?
SFP and SFP+ have the same size and appearance. The main differenceaa between SFP and SFP+ is that SFP is often used for 100Base or 1000Base applications, while the SFP+ is used in Gigabit Ethernet applications. And the data rate and transmission distance of them are also different. For example, SFP supports speed up to 4Gbps Fibre Channel transceiver, while the speed of SFP+ transceiver is up to 10.3125Gbps.
- Can we use SFP hardware in SFP+ slots?
In many cases, SFP+ port accept SFP optics, but the speed will be down to 1G instead of 10G. However, SFP+ optics cannot be plugged into SFP port, because SFP+ does not support speed under 1G. In addition, almost all SFP+ ports on switches can support SFPs, but many SFP+ ports of Brocade switch only support SFP+ optics.
- How to maintain SFP module?
Generally speaking, there are several aspects to maintain SFP transceivers.Optical port protection. Keep the end face clean; avoid prolonged exposure the SFP port in the air; avoid scratching the end face or sleeve, etc.Use the SFP module correctly. Keep the optical transceiver work in the normal level; plug and insert the SFP transceiver gently to reduce accidental damageKeep the using environmental humidity of SFP transceiver is normal.
