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Wednesday 01 April, 2020 | RSS Feed

SFP 40 km VS. DWDM SFP: Which to Choose?

by www.fiber-mart.com

Small Form-factor Pluggable (SFP) is a compact, hot-pluggable transceiver used for both telecommunication and data communications applications. It is also called mini-GBIC for its smaller size, which is the upgraded version of GBIC transceiver. These 1Gb SFP modules are capable of supporting speeds up to 4.25 Gbps. And they are most often used for Fast Ethernet of Gigabit Ethernet applications. It interfaces a network device motherboard (for a switch, router, media converter or similar device) to a fiber optic or copper networking cable. SFP modules are commonly available in several different categories: 1000BASE-T SFP, 1000BASE-EX SFP, 1000BASE-SX SFP, 1000BASE-LX/LH SFP, 1000BASE-BX SFP, 1000BASE-ZX SFP, CWDM SFP and DWDM SFP modules. These modules support different distance according to the different Gigabit Ethernet standard. Today’s main subject will discuss SFP 40 km vs. DWDM SFP.
 
SFP 40 km
SFP 40 km transceiver is designed for highly reliable fiber optic network links up to 40 km. It is a cost effective transceiver designed to enable 1Gb for data center and core network applications. 1000BASE-EX SFP is the most popular SFP 40 km transceiver which runs on 1310nm wavelength lasers and achieves 40km link length. Except that, 1000BASE-BX BiDi SFP, 1000BASE-LH SFP and 1000BASE-LX SFP can also realize the transmission distance up to 40 km. The following will introduce these 1GbE SFP 40 km transceivers respectively.
 
1000BASE-EX SFP 40 km
1000BASE-EX SFP transceiver module is designed to connect a Gigabit Ethernet port to a network and has dual LC/PC single mode connectors. It operates on standard single-mode fiber-optic link spans of up to 40 km in length. The SFP Ethernet module provides a dependable and cost-effective way to add, replace or upgrade the ports on switches, routers and other networking equipment. Cisco GLC-EX-SM1550-40 and Cisco GLC-EX-SMD are 1G single mode fiber SFP 40 km modules for 1000BASE-EX Gigabit Ethernet transmission. GLC-EX-SM1550-40 supports a 1550nm wavelength signaling, while GLC-EX-SMD supports a 1310nm wavelength signaling.
 
1000BASE-BX SFP 40 km
1000BASE-BX SFP is a kind of BiDi transceiver, which can be divided into 1000BASE-BX-D SFP and 1000BASE-BX-U SFP. These two SFP transceivers must be used in pairs to permit a bidirectional Gigabit Ethernet connection using a single strand of single mode fiber (SMF) cable. The 1000BASE-BX-D SFP operates at wavelengths of 1490nm TX/1310nm RX, and the 1000BASE-BX-U SFP operates at wavelengths of 1310nm TX/1490nm RX.
 
1000BASE-BX-D BiDi SFP 40 km
Cisco GLC-BX40-D-I and GLC-BX40-DA-I are pluggable fiber optical transceivers for Gigabit Ethernet 1000BASE-BX and Fiber Channel communications. They support link length of up to 40 km point to point on single mode fiber at 1Gbps bidirectional and use an LC connector. The GLC-BX40-D-I transceiver transmits a 1490nm channel and receives a 1310nm signal, whereas GLC-BX40-DA-I transmits at a 1550nm wavelength and receives a 1310nm signal.
 
1000BASE-BX-U BiDi SFP 40 km
Similar to 1000BASE-BX-D 40 km SFP , Cisco GLC-BX40-U-I and GLC-BX40-UA-I also support link length of up to 40 km point to point on single mode fiber at 1Gbps bidirectional and use an LC connector. The main difference is the wavelength: GLC-BX40-U-I transmits a 1310nm channel and receives a 1550nm signal, whereas GLC-BX40-UA-I transmits at a 1310nm wavelength and receives a 1490nm signal. A GLC-BX40-D-I or GLC-BX40-DA-I device connects to a GLC-BX40-U-I or GLC-BX40-UA-I device with a single strand of standard SMF with an operating transmission range up to 40 km.
 
1000BASE-LX SFP 40 km
1000BASE-LX is a standard specified in IEEE 802.3 Clause 38 which uses a long wavelength laser. The “LX” in 1000BASE-LX stands for long wavelength, indicating that this version of Gigabit Ethernet is intended for use with long-wavelength transmissions (1270 – 1355nm) over long cable runs of fiber optic cabling. Allied Telesis AT-SPLX40 and Allied Telesis AT-SPLX40/1550 are 1000BASE-LX SFP single-mode modules supports Gigabit Ethernet over single-mode cables at distances up to 40 km. AT-SPLX40 operates over a wavelength of 1310nm for 40 km, whereas AT-SPLX40/1550 operates over a wavelength of 1550nm.
 
1000BASE-LH SFP 40 km
Unlike 1000BASE-LX, 1000BASE-LH is just a term widely used by many vendors. Long Haul (LH) denotes longer distances, so 1000BASE-LH SFP modules operate at a distance up to 70 km over single mode fiber. Cisco Linksys MGBLH1 is a easy-to-install modules that provide a simple way to add fiber connectivity or to add an extra Gigabit Ethernet port to switches. The MGE transceiver can support distances up to 40 km over single-mode fiber at a 1310nm wavelength.
 
DWDM SFP
DWDM SFP transceivers are used as part of a DWDM optical network to provide high-capacity bandwidth across an optical fiber network, which is a high performance, cost effective module for serial optical data communication applications up to 4.25Gb/s. DWDM transceiver uses different wavelengths to multiplex several optical signal onto a single fiber, without requiring any power to operate. There are 32 fixed-wavelength DWDM SFPs that support the International Telecommunications Union (ITU) 100-GHz wavelength grid. The DWDM SFP can be also used in DWDM SONET/SDH (with or without FEC), but for longer transmission distance like 200 km links and Ethernet/Fibre Channel protocol traffic for 80 km links. Cisco C61 DWDM-SFP-2877-40 is a 1000BASE-DWDM SFP 40km transceiver, which is designed to support distance up to 40 km over single-mode fiber and operate at a 1528.77nm DWDM wavelength (Channel 61) as specified by the ITU-T.
 
SFP 40 km VS. DWDM SFP
Transmission Medium
Generally, the standard SFP 40 km transceivers transmit through the single mode fiber, while DWDM SFP carries signals onto a single optical fiber to achieve maximum distances by using different wavelengths of laser light. So the DWDM SFP transceivers do not require any power to operate.
 
Wavelength
The standard SFP 40 km transceivers support distances up to 40 km over single-mode fiber at a 1310nm/1550nm wavelength. (the BiDi SFP has 1490nm/1550nm TX & 1310nm RX or 1310nm TX & 1490nm/1550nm RX ). However, DWDM SFP operates at a nominal DWDM wavelength from 1528.38 to 1563.86nm onto a single-mode fiber. Among them, 40 km DWDM SFP operates at a 1528.77nm DWDM wavelength (Channel 61).
 
Application
DWDM SFP is used in DWDM SONET/SDH, Gigabit Ethernet and Fibre Channel applications. These modules support operation at 100Ghz channel. The actual SFP transceiver offers a transparent optical data transmission of different protocols via single mode fiber. And for back-to-back connectivity, a 5-dB inline optical attenuator should be inserted between the fiber optic cable and the receiving port on the SFP at each end of the link.
 
Price
DWDM provides ultimate scalability and reach for fiber networks. Boosted by Erbium Doped-Fiber Amplifiers (EDFAs)  – a sort of performance enhancer for high-speed communications, DWDM systems can work over thousands of kilometers. Most commonly, DWDM SFP is much more expensive than the standard SFP. You can see the price more clearly in the following cable.




Which 10G SFP+ Optics Are Compatible with Intel X520 Adapter?

by www.fiber-mart.com

The escalating deployments of servers with multi-core processors and demanding applications are driving the need for 10 Gbps connections. Intel X520 10 GbE Adapter is the most flexible and scalable Ethernet adapters for today’s demanding data center environments. At the same time, 10G SFP+ optics play the most important role for its 10G connectivity. But seriously, do you know which 10G SFP+ optics are compatible with the Intel Ethernet converged network adapter X520 series? This blog will give you solutions.
 
About Intel X520 Adapter
Intel X520 adapter is powered by reliable and proven 10G Ethernet technology, which offers high performance for high-IO intensive applications and showcase the next generation in 10 GbE networking features for the enterprise network and data center. It is designed for multi-core processors, which supports for technologies such as multiple queues, receive-side scaling, multiple MSI-X vectors and Low Latency Interrupts. It addresses the demanding needs of the next-generation data center by running mission-critical applications in virtualized and unified storage environments. In a multicore platform, the Intel X520 adapter supports Intel I/O Virtualization Technology (IOVT), which helps accelerate data across the platform, therefore improving application response times. For virtualized environments, it offers advanced features with VMDq (Virtual Machine Device Queues) that lower processor utilization and increase I/O performance.
 
The Intel X520 adapter provides SFP+ based connectivity options (fiber or DAC cabling). Intel X520 adapters are provided with 7 models: X520-QDA1, X520-DA2, X520-SR1, X520-SR2, X520-DA1OCP, X520-DA2OCP and X520-LR1. X520-SR1 is shipped with 1 SR SFP+ Optic,  X520-SR2 has dual-port and is shipped with 2 SR SFP+ Optics, X520-LR1 has single-port and is shipped with 1 LR SFP+ Optic, and X520-DA2 has dual-port and does not ship with any optics or cables, which is the most suitable one for 10G SFP+ Optics and the most popular one on the market. The following table lists the detailed information of Intel X520 adapter series in Table 1.
 
10G SFP+ Optics for Intel X520 Adapter
A 10 Gigabit Ethernet network is essential for businesses that demand high bandwidth for virtualization and fast backup and restore for an ever-growing amount of data. To ensure maximum flexibility, Intel X520 adapters supports the ability to mix any combination of the SFP+ optical modules, direct attach copper cables or 1000BASE-T SFP modules. Besides, 10G SFP+ Optics are available in both short range (SR) 850 nm and long range (LR) 1310 nm options. This enables customers to create the configuration that meets the needs of their data center environment.
 
10G SFP+ Optical Modules for Intel X520
Intel Ethernet SFP+ SR optics and Intel Ethernet SFP+ LR optics are the only 10 Gbps optical modules supported. Other brands of SFP+ modules are not allowed and can’t be used with the X520 adapters. The following table lists the supported 10Gb Ethernet SFP+ optical transceivers for Intel X520 adapters in Table 2. (Note: Other brands of SFP+ optical modules will not work with the Intel Ethernet Server Adapter X520 Series.)
 
1000BASE-T SFP Modules for Intel X520
Some 1000BASE-LX and 1000BASE-SX modules can work with Intel Ethernet Converged Network Adapter X520 series. These modules referred to only highlight specifications and compatibility with Intel Ethernet server adapter X520 series. The table lists tested modules in Table 3. Other similar modules may work but have not been tested (many similar modules can be purchased in fiber-mart.COM). Remind you to use your own discretion and diligence to purchase modules with suggested specifications from any third party.
 
10G SFP+ Direct Attach Copper Cables (10G SFP+Cu) for Intel X520
A DAC cable is a 2-pair shielded copper cabling terminated with SFP+ electrical modules. Intel X520 Adapters require that any SFP+ passive or active limiting direct attach copper cable should comply with the SFF-8431 v4.1 and SFF-8472 v10.4 specifications. SFF-8472 Identifier must have value 03h (You can verify the value with the cable manufacturer). Maximum cable length for passive cables is 7 meters. Support for active cables requires Intel Network Connections software version 15.3 or later. The following table lists the fully compatible 10Gb DAC cables for Intel Ethernet server adapter X520 series in Table 4.
 
QSFP+ Breakout Cables for Intel X520
The new QSFP+ single-port X520-QDA1 can connect the server to the latest 40GbE switches with a single cable operating in 4x10GbE mode. This adapter can also utilize existing 10GbE SFP+ switches using the QSFP+ to 4xSFP+ breakout cable. The QSFP+ adapter supports direct attach copper cables and Intel Ethernet QSFP+ SR optical transceivers. Intel Ethernet QSFP+ breakout cables have one QSFP+ connector on one end and break out into four SFP+ connectors on the other end for direct attachment to SFP+ cages.
 
From what we have discussed, 10G SFP+optics are determined to the data transmission of Intel X520 adapters. SFP+ SR Optics, SFP+ LR optics, 1000BASE-T SFP modules, 10G SFP+ direct attach copper cables and QSFP+ breakout cables are available stock in fiber-mart.COM. All SFP+ cables are 100% tested to ensure the compatible and quality. Welcome to visit www.fiber-mart.com.





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