October 2017

OM4 vs. OM5: What’s the Difference?

31. october 2017 at 10:42
As the demand for bandwidth, new transmission media must be developed to meet the requirements of users. The latest in optical transmission media is called OM5 fiber. To help you use this advanced fiber to its greatest advantage, this paper describes the basis of OM5 fiber, and highlights the key differences with OM4 fiber.

What Is OM5 Fiber?
According to the ISO/IEC 11801, OM5 fiber specifies a wider range of wavelengths between 850nm and 953nm. It was created to support short wavelength division multiplexing (SWDM), which is one of the many new technologies being developed for transmitting 40Gb/s and 100Gb/s. In June 2016, ANSI/TIA-492AAAE, the new wideband multimode fiber standard, was approved for publication. And in October of 2016, OM5 fiber was announced as the official designation for cabling containing WBMMF (Wide Band Multimode Fiber) by ISO/IEC 11801. From then on, OM5 may be a potential new option for data centers that require greater link distances and higher speeds.
What Is OM4 Fiber?
OM4 is laser-optimized 50um fiber having 4.7GHz*km EMB bandwidth designed for 10 Gb/s, 40 Gb/s, and 100 Gb/s transmission. OM4 fiber has been on the market since 2005, sold as premium OM3 or OM3 fiber. The OM4 cable designation standardizes the nomenclature across all manufacturers so that the customer has a clearer idea of the product that they are buying. OM4 fiber is completely backwards compatible with OM3 fiber and shares the same distinctive aqua jacket. OM4 was developed specifically for VSCEL laser transmission and allows 10 Gig/second link distances of up to 550 Meters (compared to 300M with OM3) and offers an Effective Modal Bandwidth (EMB) of 4700 MHz-km.

OM4 vs. OM5: What's the Difference?
Since OM1 and OM2 fiber can not support 25Gbps and 40Gbps data transmission speeds, OM3 and OM4 were the main choices for multimode fiber to support 25G, 40G and 100G Ethernet. However, it's becoming more costly for optical fiber cable to support next-generation Ethernet speed migration as bandwidth requirements increase. Against such a background, OM5 fiber was born to extend the benefits of multimode fiber in data centers.
The key difference between them is that EMB is specified only at 850 nm for OM4 fiber at 4700 MHz-km, while OM5 EMB values are specified at both 850 nm and 953 nm and the value at 850 nm is greater than that of OM4. Therefore, OM5 fiber offers users longer length distances and more choices in optical fiber. In addition, TIA has specified lime green as the official cable jacket color for OM5, while OM4 is aqua jacket. And OM4 is designed for 10Gb/s, 40Gb/s, and 100Gb/s transmission, but OM5 is designed for 40Gb/s, and 100Gb/s transmission which reduces the fiber counts for high speed transmissions.

What's more, OM5 cable can support four SWDM channels, each carrying 25G of data to deliver 100G Ethernet using a single pair of multimode fibers. Besides, it is fully compatible with OM3 and OM4 fiber. OM5 is available globally for installations in multiple enterprise environments, from campuses to buildings to data centers. In a word, OM5 fiber is a better choice than OM4 on transmission distance, speed and cost.

OM5 fiber provides next-generation multimode fiber performance for today and tomorrow's high speed applications. With its significantly higher bandwidth, it can be assured that multimode fiber will continue to provide the most cost effective solutions for short reach applications in data centers and LANs. OM5 precisely meets the demands, and it will be your preferable choice for your data centers.

Difference Between Cisco GLC-T and GLC-TE

26. october 2017 at 13:40
GLC-T and GLC-TE are all Cisco 1000BASE-T SFP types. And they are used in plenty of networking environment. Both the models have quite a similarity like supporting Auto negotiation, 10/100/100 auto negotiation speed, scalability up to length of 100 m which equals 328 ft in addition to Auto MDI/MDIX feature set. We all know that GLC-T has been announced end of sale and end of life last year. And the new GLC-TE is the replacement for the GLC-T. So what's the difference between them? You may find answer in this post.
From the chart above, we can see that GLC-T works with commercial temperature range (0 to 70℃) while SFP-GLC-TE works in Extended temperature range (-5 to 85℃). In general, non-extended temperature range SFP/SFP+'s are intended to be used within a data centre, or at least indoors - such as between a switch and a server. The extended temperature range units tend to be optics, and are intended to be used with fibre that goes outside of the building (such as between buildings) where there is not a nice temperature controlled environment.

Details for SFP Operating Temperature Range: COM, EXT and IND
Operating temperature range:
  • Commercial temperature range (COM): 0 to 70℃ (32 to 158℉)
  • Extended temperature range (EXT): -5 to 85℃ (23 to 185℉)
  • Industrial temperature range (IND): -40 to 85℃(-40 to 185℉)
  • Storage temperature range: -40 to 85℃(-40 to 185℉)
Migrate to the Cisco 1000BASE-T SFP Replacement Module
End-of-Sale Product Part NumberProduct DescriptionReplacement Product Part NumberReplacement Product Description
GLC-T1000BASE-T SFPGLC-TE1000BASE-T SFP transceiver module for Category 5 copper wire
GLC-T++=1000BASE-T SFP, TAA compliantGLC-TE++=1000BASE-T SFP
Get Hot Cisco Optical Transceivers From FS.COM With Best Price
The Cisco 1 Gbps SFPs are supported across a variety of Cisco networking equipment such as ASA5500 Series Appliances, ASR 901 and 903 Series Routers, Catalyst Express 500 and Express 520, Catalyst 2900, 2940, 2950, 2960, 2960-Plus, 2960-C, 2960-S, 2960-SF, 2960-X Series, Catalyst 3000 and 3100 Blade Switches, Catalyst 3750-E Series, 3750 Metro, 3750-X Series, Catalyst 4500 and 4500-X Series, Cisco 1941 Series Router, Cisco 3200, 3600, 3700 Series Router, Cisco 6400 Universal Access Router, Cisco 2500 Connected Grid Switch Series, Cisco IE3010 Series, Cisco ME 2600X, Cisco ME 3600X and ME 3800X, Cisco MWR 2941 Mobile Wireless Router, Nexus 2000, 3000, 4000, 5000, 7000, 9000, 9300, 9500 (modular) Series and so on.

Since GLC-T was replaced by GLC-TE, GLC-TE modules are re all you'd need for Gigabit Ethernet in most of networks and they cost less as well. Fiberstore (FS.COM) provides all Cisco compatible SFP modules. Every SFP module in FS.COM was tested to ensure 100% compatibility, but only cost a small fraction of name-brand alternatives.

Solutions For Building 10G Home Network

19. october 2017 at 11:00
The network has changed the way we live, work and communicate. Nobody today would deny the importance of the network. And accordingly, the increasing demand for data center calls for higher-performance servers, from 100M, 1G, 10G, to 40G and 100G. High speed Ethernet never stops developing. 10G networks, in this case, are no longer confined to small and middle-sized business. It's not uncommon for home to start with a 10G network setup. So how to get 10G home network? Here are some practical solutions for your reference.

Needs for 10G Home Network
It is not difficult to find that almost everything nowadays rely on a fast and reliable network, which leads to tremendous traffic and applications running on the network. Setting up 10G home network avoids network congestion at busy times while improves your productivity. Before deployment, you should ask yourself a few questions, such as how many computers, printers and other peripherals will connect to your network? How much wireless coverage will you need at your location? What type of mobile devices will need access to your network?

Solutions for 10G Home Network
10G Switch
To build a 10G network, several components are indispensable: 10G core switches, access switches with 10G uplinks, and 10G network interface cards for servers and storage devices. The past few years had witness the price dropping of 10G network switches. Such as FS S3800-48T4S has a decent price by offering 48 100/1000Base-T and 4 10GE SFP+. And what's more, FS S3800 series switches offering 24 ports with 4 10G uplinks are well suited for home network use.
FS 3800 series switch
10G Cabling-10GBASE-T or 10G SFP+?
Upgrading the existing 1G network to 10G can be simple. As 10G switches also support 10GBASE-T, you can use the same RJ45 network cable to connect the 10G switch with your servers, storage and some other switches. The only difference is to use Cat6a network cable instead of Cat5e and Cat6 cable, or choose SFP+ 10GBASE-T modules with 2.5W power consumption and a maximum distance of 30 m.
sfp+ DAC-cable
For 10G switches that support 10G SFP+, you should use these ports if you have devices that come with 10G SFP+ port, or you need a 10G connection to other switches over 100m away. SFP+ ports look just the same as SFP ports on your Gigabit switches, but they're now running at 10 Gigabit. For servers or storage devices with 10G SFP+ port, the most cost efficient way to connect is to use 10G DAC (direct attach cable). These are basically copper cables with SFP+ connector on both sides. But this cabling way is only suitable for short connectivity. For data link over 100 meters, a pair of SFP+ modules and the matching fiber optic cable are needed. Depending on the length required in home network, you can use 10G optics such as 10GBASE SR SFP module and multimode fiber to reach 300 meters.

This article presents you some basic facts about 10 Gigabit Ethernet and how you can build a home network over 10 Gigabit. FS provides comprehensive 10G solutions: all the components mentioned to build a 10G home network are available at FS.COM, including Cat6a Ethernet cables, fiber patch cables, DACs and 10G SFP+ modules.

Comparison Between Cisco Nexus 7000 Series Cisco Nexus 9500 Series Switches

10. october 2017 at 12:38
Cisco Nexus 7000 series switch generally used in the data center for core and distribution purposes while Cisco Nexus 9000 series switch is used in ACI infrastructure. All these hardware supports the VXLAN and LISP protocols while Nexus 9500 series Switch is used as Spine in the ACI infrastructure in the data center. Both switches can be used in the Core of a DC. Then what about the difference? You may find answer in this post.

Cisco Nexus 7000 Series Switches
Cisco Nexus 7000 Series Switches
All Cisco Nexus 7000 Series chassis use a passive mid-plane architecture, providing physical connectors and copper traces for interconnecting the fabric modules and the I/O modules for direct data transfer. All intermodule switching is performed via the crossbar fabric ASICs on the individual I/O modules and fabric modules. In the case of Cisco Nexus 7004 chassis, since there are no fabric modules, the mid-plane provides the connectors and traces to interconnect the fabric ASICs on the I/O modules directly.

Fully distributed fabric architecture composed of up to five fabric modules combined with the chassis midplane delivers up to 550 Gbps per slot for 8.8 Tbps, 9.9 Tbps, and 18.7 Tbps of forwarding capacity in the 9-slot, 10-slot, and 18-slot switches, respectively. The 4-slot chassis delivers up to 1.92 Tbps of forwarding capacity in combination with the built-in fabric system. Below is the diagram shows the existing Cisco Nexus fabric infrastructure into the extended Cisco ACI fabric. Cisco Nexus fabric uses Cisco nexus 7000 series switches and Cisco extended ACI fabric uses Cisco nexus 9000 series switches.
Cisco 7000 series and Cisco 9000 series Nexus Switches Topology
Cisco Nexus 9500 Series Switches
Cisco Nexus 9500
The Cisco Nexus 9500 platform consists of Layer 2 and 3 nonblocking Ethernet switches with backplane bandwidth of up to 172.8 Terabits per second (Tbps). The Cisco Nexus 9504, 9508, and 9516 Switches support 1, 10, 25, 40, 50, and 100 Gigabit Ethernet interfaces through a comprehensive selection of modular line cards. Configurable with up to 2304 x 10 Gigabit Ethernet ports, 2048 x 25 Gigabit Ethernet ports, 576 x 40 Gigabit Ethernet ports, 1024 x 50 Gigabit Ethernet ports, or 512 x 100 Gigabit Ethernet ports, they provide ample capacity for both access- and aggregation-layer deployments.

Cisco Application Centric Infrastructure is a holistic architecture with centralized automation and policy-based application profiles. The Cisco ACI fabric is designed from the foundation to support emerging industry demands while maintaining a migration path for architecture already in place. The fabric is designed to support management automation, programmatic policy, and dynamic "workload-anywhere" models. The Cisco ACI fabric accomplishes this with a combination of hardware, policy-based control systems, and software closely coupled to provide advantages not possible in other models.

Comparison Between Cisco Nexus 7000 Series & Cisco Nexus 9500 Series
Below is the comparison table between Cisco Nexus 7000 series and Cisco Nexus 9500 Series switches.
-Comparison Between Cisco Nexus 7000 Series & Cisco Nexus 9500 Series
A point to highlight when reviewing the comparison links is that the Nexus 9500 doesn't support storage protocols yet, whereas the Nexus 7000 supports FCoE. Additionally, if you're considering the Data Center Interconnect aspects, the Nexus 7000 supports what are now considered fairly robust and established protocols for multi-DC interconnect over distance which are OTV and LISP. The Nexus 9500 does not support these protocols, however, instead supports what are shaping up to be a new set which are mBGP and EVPN. You should note that mBGP/EVPN only currently support site-to-site DCI, as opposed to the multi-site capability of OVT/LISP, however, there's a lot of development going on so it will be something to keep an eye on.

10G Cabling Solution for Cisco Nexus 7000
10G Aggregation (HDA) to Edge (EDA) Links
With 10G uplinks between SFP+ port fabric interfaces on Nexus 2000 series access switches and Nexus 6004 aggregation switches, a 8-fiber MTP to LC harness is run directly between QSFP+ and SFP+ ports on the two switches. This cabling is best for inter-switch links when both switches are in close proximity. Use this configuration only when QSFP+ ports on the 6004 are configured as 4 x 10G channels.
10G Structured Cabling QSFP+ to SFP+ Ports
In larger data centers where distances are greater and fiber counts are higher and switches are more widely dispersed, a structured cabling system provides a much better approach to cable management, utilization, and organization. Trunks are run between interconnect points near 6004 series and 2000 series switches. From there, transceiver modules, and jumpers complete the connection to switches. Different length jumpers can be used to connect to individual QSFP+ and SFP+ ports on the switches.
This article covers the comparison between Cisco Nexus 7000 series and Cisco Nexus 9500 Series switches. And also some optics solution from FS.COM has been recommended for your reference. Besides above optics, FS.COM also provide compatible transceivers and various patch cables for both Nexus 7000 and 9500.

Network Switch vs. Network Hub: What’s The Difference?

6. october 2017 at 10:01
A network switch is a device in a computer network that electrically and logically connects together other devices. Multiple data cables are plugged into a switch to enable communication between different networked devices. Network hubs are devices commonly used to connect segments of a LAN. The hub contains multiple ports. When a packet arrives at one port, it is copied to the other ports so that all segments of the LAN can see all packets. Hubs and switches are different types of network equipment that connect devices. They differ in the way that they pass on the network traffic that they receive.
network switch
Comparison Between A Network Switch and A Network Hub
network switch vs nework hub
A network switch is effectively a higher-performance alternative to a network hub. Technically speaking, hubs operate using a broadcast model and switches operate using a virtual circuit model. When four computers are connected to a hub, for example, and two of those computers communicate with each other, hubs simply pass through all network traffic to each of the four computers. Switches, on the other hand, are capable of determining the destination of each individual traffic element (such as an Ethernet frame) and selectively forwarding data to the one computer that actually needs it. By generating less network traffic in delivering messages, a switch performs better than a hub on busy networks.

A network switch is a small hardware device that joins multiple computers together within one local area network (LAN). While a hub connects multiple Ethernet devices together, making them act as a single segment.

Networking hubs are currently available with USB, Ethernet, Firewire, and wireless connections. Most popular amongst them is still Ethernet, which requires a special networking card on the PC, or an Ethernet connection built into the motherboard. Switches are also available for networks in USB, Ethernet, Firewire, and Wireless, and simple switches like an on/off button can be applied to manage and maintain large computer networks. As with hubs, Ethernet implementations of network switches are the most common. Mainstream Ethernet network switches support either 10 Mbps, 100 Mbps, or 10/100 Mbps Ethernet standards. On the other hand, hubs include a series of ports that each accept a network cable. Larger hubs contain eight, 12, 16, and even 24 ports.

When Should I Use A Network Hub or Network Switch?
In a small network (less than 30 users), a hub (or collection of hubs) can easily cope with the network traffic generated and is the ideal piece of equipment to use for connecting the users. When the network gets larger (about 50 users), you may need to use a switch to divide the groups of hubs, to cut down the amount of unnecessary traffic being generated.

If there is a hub or switch with Network Utilization LEDs, you can use the LEDs to view the amount of traffic on the network. If the traffic is constantly high, you may need to divide up the network using a switch. When adding hubs to the network (to add more users), there are rules about the number of hubs you can connect together. Switches can be used to extend the number of hubs that you can use in the network.
Seemingly, they may look the same, but they do have some differences inside. Whatever device you use for your network, you must make sure it can perform all the functions required by the network. If you have a limited budget, a network switch is a good solution with relatively high performance and lower cost.