2017-11-30

Things We Should Know About SFP Transceiver

In today’s data center, fast Ethernet is out of date.  What takes the place of it is SFP transceiver. Although SFP transceiver is commonly applied in the data center, and there are still many people knowing little of it, such as SFP transceiver types, SFP applications, SFP use tips and so on. Now this article will introduce things we should know about it there.

What Is SFP Transceiver?
The small form-factor pluggable (SFP) is a compact, hot-pluggable optical module transceiver used for both telecommunication and data communications applications. The form factor and electrical interface are specified by a multi-source agreement (MSA) under the auspices of the Small Form Factor Committee. It is a popular industry format jointly developed and supported by many network component vendors.

SFP Transceiver

An SFP interface on networking hardware provides the device with a modular interface that the user can easily adapt to various fiber optic and copper networking standards. Existing SFP transceivers support SONET, gigabit Ethernet, Fibre Channel, and other communications standards. Due to its smaller size, the SFP has replaced the gigabit interface converter (GBIC) in most applications; the SFP is sometimes referred to as a Mini-GBIC. In fact, no device with this name has ever been officially defined in the MSAs.

Types of SFP Transceiver
SFP transceivers are available with a variety of transmitter and receiver specifications, allowing users to select the appropriate transceiver for each link to provide the required optical reach over the available optical fiber type. With the respect to SFP transceiver types, it can be sorted out according to transmission rate, wavelength. The introductions of them are as below:
Classified according to the SFP transceiver rate, it includes 155M/622M/1.25G/2.125G/4.25G/8G/10G, in which 155M and 1.25G are usually applied. Besides, 10G tech is maturely developed, and the demands for it tend to rise.
Sorted according to the SFP wavelength, it consists of 850nm/1310nm/1550nm/1490nm/1530nm/1610nm, in which 850nm wavelength belongs to multimode, and its transmission distance is less than 2KM; 1310nm/1550nm wavelength belongs to single mode, and the transmission distance is over 2KM. Relatively speaking, the prices of 850nm, 1310nm and 1550nm wavelength are lower than the other three types. Moreover, bare optical modules without signs are easy to get mixed up, thus manufacturers usually make a clarification in the colours of pull rings. For example, pull rings of  modules differ in colors, which means they distinguish in wavelengths. Black represents 850mn wavelength; blue represents 1310mn wavelength; yellow represents 1550mn wavelength; and purple represents 1490mn.
In addition, it can also be divided into these categories, such as Gigabit Ethernet SFP, Fast Ethernet SFP, BiDi SFP, CWDM SFP, DWDM SFP, Fiber Channel SFP and so on, in which Gigabit Ethernet SFP and CWDM SFP are relatively common ones (Gigalight will provide several ones for reference at the end of this article, shown as the tables)

Applications
SFP sockets are found in Ethernet switches, routers, firewalls and network interface cards. Storage interface cards, also called HBAs or Fibre Channel storage switches, also make use of these modules, supporting different speeds such as 2Gb, 4Gb, and 8Gb. Because of their low cost, low profile, and ability to provide a connection to different types of optical fiber, SFP provides such equipment with enhanced flexibility.

Use Tips
If module is improperly operated when used, it may not work. Once this situation happens, things that should be done first is to check it carefully and analyze the causes. The failure of optical transceiver usually includes these two types: the failure of transmitting terminal and receiving terminal. The commonly-seen reasons of failure are as below:
1.    The contaminated interface of fiber connector result in the secondary contamination of optic module’s optical port
2.    Optical port of optic module is exposed to the air, and dust into it brings about contamination.
3.    Optic fiber connector is with bad quality.

Conclusion
Although the needs for higher rate products will be increased with the development of tech, and SFP transceiver will still be in the optic market for a long time due to its advantages in miniaturization, port density and so on. This article have a relative comprehensive introductions to SFP transceiver, and it’s believed that it will be beneficial to us in the future use of SFP transceiver.

More Information :
1.    Gigalight Gigabit Ethernet SFP:
Gigalight Gigabit Ethernet SFP
Part Number
Description

GE-GB-P3RT-E
Compliant with the Gigabit Ethernet and 1000BASE-T standards as specified in IEEE 802. 3-2002 and IEEE 802.3ab, which supporting 1000Mbps data- rate up to 100 meters reach over unshielded twisted-pair category 5 cable.
GP-8524-S5TD
Supporting data-rate of 1.25Gbps and 550m transmission distance with MMF. All modules satisfy class I laser safety  requirements.
GP-3124-L4TD
Supporting data-rate of 1.25Gbps he transceiver consists of three sections: a DFB laser transmitter, a PIN photodiode
integrated with a and 40km transmission distance with SMF
GP-5524-L8TD
Supporting data-rate of 1.25Gbps and 80km transmission distance with SMF. Compatible with SFP Multi-Source Agreement (MSA) and SFF-8472.

2.    Gigalight CWDM SFP Transceivers:
Gigalight CWDM SFP Transceivers
Part Number
Description

GPC-4903-08TD
Supporting data-rate of 155Mbps and 80km transmission distance with SMF. Compatible with SFP Multi-Source Agreement (MSA) and SFF-8472.
GPC-5103-08TD
Supporting data-rate of 155Mbps and 80km transmission distance with SMF. Compatible with SFP Multi-Source Agreement (MSA) and SFF-8472.
GPC-5303-08TD
Supporting data-rate of 155Mbps and 80km transmission distance with SMF. Compatible with SFP Multi-Source Agreement (MSA) and SFF-8472.
GPC-5503-08TD
Supporting data-rate of 155Mbps and 80km transmission distance with SMF. Compatible with SFP Multi-Source Agreement (MSA) and SFF-8472.
GPC-5703-08TD
Supporting data-rate of 155Mbps and 80km transmission distance with SMF. Compatible with SFP Multi-Source Agreement (MSA) and SFF-8472.
GPC-5903-08TD
Supporting data-rate of 155Mbps and 80km transmission distance with SMF. Compatible with SFP Multi-Source Agreement (MSA) and SFF-8472.
GPC-6103-08TD
Supporting data-rate of 155Mbps and 80km transmission distance with SMF. Compatible with SFP Multi-Source Agreement (MSA) and SFF-8472.


Note: Infiberone is the online store of Gigalight