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What’s the Difference Between Cisco S-Class and Non-S-Class Optics?

What’s the Difference Between Cisco S-Class and Non-S-Class Optics?

10G-SFPCisco S-class optics were launched in December last year. Until now, many people are still confused with this series of optics because in Cisco’s official datasheet, there is no obvious differences on specifications between the S-class and Non-S-class optics. However, if you are a loyal user of Cisco transceivers, you may find that the Non-S-class optics cost more than the S-class’s, e.g. SFP-10G-SR= costs about $220 more than the SFP-10-SR-S= module, or the SFP-10G-LR is much more expensive than the SFP-10G-LR-S. So, what’s the main difference between them? Today, we are going to talk something about this topic.

According to Cisco, S-class optics are designed for enterprise and data center 10G and 40G applications (don’t scale down to 1GbE). This new set of optics does not have unnecessary features for these applications, leading to a more attractive price. This is why S-class optic is cheaper than Non-S-class. Meanwhile, Cisco announced that S-class optics are available only in the most common reaches needed in enterprise and data center applications. “unnecessary features” and “the most common reaches” really made buyers who want to have a try puzzled.

With the attractive price, S-class optics attract many users who are enamored of Cisco optics. At the same time, a series of questions are asked by users. What are the unnecessary features? When should we use S-class optics? … Unfortunately there is no special document yet for this. We may even have no idea from the datasheet. But don’t feel disappointed, here are some experiences may help you to know more.

S-class is Ethernet only, no OTN (Optical Transport Network) or WAN-PHY (Wide Area Network Physics). In addition, it is no TAA compliance for S-class. Moreover, S-class and non-S-class optics are with different temperature ranges. Thus, if you are an enterprise or datacenter environment that doesn’t need any special long distance, temperature tolerances, or other special features, S-Class optics are cheaper and should be just fine for you. In fact, there may be more unknown differences. But there is no doubt that the differences are not the main concerns of Cisco when they introduced the S-class. The low price is the main selling point, and the compatibility is no problem.

However, with the increasing development of 3rd-party compatible optics market, S-class optics are as popular as Cisco expected. For instance, you may prefer to buy a Cisco SFP-10G-SR compatible optics with 18 dollors in Fiberstore rather than about 500 dollors of Cisco SFP-10G-SR-S optics. Because you can enjoy the same functions and performance the Cisco SFP-10G-SR have and just with an incredible price. Of cause, if you are a loyal Cisco users, S-class optics are ideal choice for you on the most common reaches needed in enterprise and data center applications.


Do You Still Worry About The Cost of Fiber Optic Transceivers?

Do You Still Worry About The Cost of Fiber Optic Transceivers?

transceiver moduleTo many users, there is an inevitable issue that the cost of fiber optic transceivers will keep adding up over time. This is why the demands of 3rd party compatible fiber optic transceivers have emerged in the market. Actually, 3rd party compatible fiber optic transceivers are the direct solution for a tight budgets. However, some issues mayoccur when using 3rd party compatible fiber optic transceiver that drive users to give it up. The worry of the cost of fiber optic transceivers still exists. This paper is going to talk about the fiber transceiver industry and discuss something you should know about the 3rd party compatible fiber optic transceivers.

Fiber Optic Transceiver Industry
When you buy transceivers for your switch, you are told to buy them from your network equipment manufacturer in order to keep your system running properly and safely. However, the switch vendor doesn’t actually manufacture these transceivers. In fact, the fiber interface transceiver manufacturers will supply a variant of their standard transceiver to the switch vendor for resale. The switch vendor will perform testing of that transceiver against their switch, create a compatibility matrix and SKU for that transceiver and start selling the transceiver. They mark up the fiber optic transceiver price to cover their costs (to test/procure/stock etc..) and make a profit. This is why the “brand” transceiver modules are more expensive.

However, as long as the transceiver complies with the required IEEE and MSA standards all it would take is a quick compatibility test and for the vendor could publish a list of all supported transceivers. Thus, 3rd party compatible transceivers are not hard to be realized. In order to corner the market, the switch vendor will request that the transceiver vendor flash the transceivers EEPROM with a vendor specific identifier. The switch operating system will use the I2C bus to query the transceiver EEPROM data, and verify that the transceiver has the correct identifier. If the identifier doesn’t match, then the OS will not power up the laser. The idea is that the switch vendor doesn’t want you to put anything into your router which hasn’t been approved by them. This is why many users will face error warning when using the 3rd transceivers.

How To Solve? – “My 3rd party transceiver does not work on my switch”
So, how to solve this issue and successfully use 3rd party transceivers on your switch? First, you should know the hidden commands of your switch. I believe some of my blog fans may know it as I have explain it some weeks ago in another papers. Yes, the “service unsupported-transceiver” command. Certainly, it is take Cisco for example, but it is easy to find the equivalent commands in other brand switches along the way. (For more details can visit this paper link.)

3rd Party Transceivers vs “Brand” Transceivers
User who have experience of buying 3rd party transceivers and “brand” transceivers may know that the the major difference is cost. So, how much difference? Assuming you get an identical transceiver from Cisco and Fiberstore, the Cisco SFP+ list price for an SR SFP+ transceiver is $1,495 USD, while Fiberstore’s one just listed at $ 16.00 USD. This difference is incredible, but it is the truth. The truth is that you won’t have to sacrifice any quality or reliability with all of the savings you receive. In contrast, you get everything you’ve come to expect from the 3rd party transceivers at up to 90% off list price. As high-density merchant-silicon based switches become mainstream, the per-port cost of the switch is dropping dramatically. The transceiver costs now become a very large part of the total system cost and, for a 48-port switch the transceiver costs could easily exceed the base cost of the switch. 3rd party transceivers help users to save more on their cost of transceivers, so why not do it?

Of course, 3rd party transceivers are good option for your transceivers solutions. However, at least so far, the market is not fully normalized. Though the optical transceiver module prices of 3rd party transceivers are very attractive, but the good and bad are intermingled. If you plan to buy the 3rd party transceivers for your switch, you had better to choose a vendor with high reputation. I recommend Fiberstore for you. Why? You may know the answer after you try.

How to Set the Domain ID to Implement the Switches

How to Set the Domain ID to Implement the Switches

Each switch in the fabric must have a unique Domain ID. The Domain ID can be set using the configure command. You can also allow the Domain ID to be set automatically. The default Domain ID for the SAN768B IS 1.

To set the Domain ID, follow these steps:

1.Enter the fabric show command to determine the current Domain IDS available.

2.Enter the switch Disable command to disable the SAN768B

3.Enter the configure command. Enter y at the fabric parameters pro met: Fabric parameters (yes, y, no, n)

4.Then, enter a unique Domain ID

5.Complete the remaining prompts or press Ctrl+D to accept the other setting and to exit.

6.Enter the switch Enable command to re-enable the SAN768B.

7.Add SFPs and fiber optic cables to the ports as required. Cables: The ports and cables that are used in trunking groups must meet specific requirements.

8.Remove the shipping plug from the ports to be used.

9.Position the SFP so that the key (the tab near the cable-end of the SFP)is on top, and insert the SFP into the port until it is firmly seated and the latching mechanism makes a clicking sound. For specific instructions, see the SFP manufacture’s documentation. Attention: The SFP module is keyed so that it can only be inserted correctly into the port. If the module does not slide in easily, make sure it is not upside down.

10.Connect the fiber optic cable to the SFPs as appropriate to the fabric topology by positioning each cable so that the key (the ridge on one side of the cable connector) is aligned with the slot in the SFP, then inserting the cable into the SFP until it is firmly seated and the latching mechanism makes a clicking sound.

Attention: The cable is keyed so that it can only be inserted correctly into the SFP, if the cable does not slide in easily, try turning it over.

11.Verify the correct operation of the switch.

12.Enter the following command at the Telnet prompt to verify the switch and port status

Switch show Backups: This command provides information about the status of the switch and the ports. Always back up to the configuration after any initial configuration changes and then perform backups periodically thereafter. This ensure that a complete configuration is available if ever required for uploading to a replacement switch. Switch configuration is backed up by issuing a configupload to the FTP server. You must install a SFP module ineach interface connector on the controller where a fiber-optic cable is to be installed.

SFP module

To give its customers flexibility as to the type of Ethernet links, even after the customer has bought the switch, Cisco switches include some physical ports whose port hardware can be changed later, after you purchase the switch. One type of port is called a gigabit interface converter(GBIC), which happened to first arrive on the market around the same time as Gigabit Ethernet, so it was given the same “gigabit”

name. More recently, improved smaller types of removable interfaces, called small form-factor pluggable (SFP), provide the same function of giving users the ability to swap hardware and change the type of physical link.

For example, Cisco SFP 10G SR, The Cisco SFP-10G-SR Module supports a link length of 26m on standard Fiber Distributed Data Interface (FDDI)-grade multimode fiber (MMF). Using 2000MHz*km MMF (OM3), up to 300m link lengths are possible. Using 4700MHz*km MMF (OM4), up to 400m link lengths are possible. and its feature is that SFP+ transceiver module for MMF, 850-nm wavelength, LC duplex connector.

Cisco SFP-H10GB-CU1M, a kind of SFP-H10GB-CU1M, 1-m 10G SFP+ Twinax cable assembly and belongs to passive device. This is a 10-meter long twinax SFP cable providing 10 Gbps Ethernet. At a length of 10 meters, this cable requires active transceivers at both ends.

As you know, I work at Fiberstrore now, it designs, manufactures, and sells a broad portfolio of optical communication products, including passive optical network, or PON, subsystems, optical transceivers used in the enterprise, access, and metropolitan segments of the market, as well as other optical components, modules, and subsystems. And there is a good news that many products are in the price at a discount of 30% now and welcome to viit our online Fiberstore.

Fiberstore SFP Plus Transceiver Modules Are On Sale Now

Fiberstore SFP Plus Transceiver Modules Are On Sale Now

fiberstore-sfp-plusFiberstore has been supplying optical transceivers since years ago. The SFP plus transceiver modules are on sale recently and almost all the transceiver modules are much cheap then before.

SFP plus, or SFP+, is the upgraded version of the previous SFP module with higher data rate and new industrial standards. It is small compared to any of the currently shipping form factors and provides the best density per line card.

SFP+ offers customers both immediate benefits and long-term advantages in supporting evolving data center needs. The SFP+ specification was initially published on May 9, 2006, and version 4.1 was published on July 6, 2009. It’s a international industry format supported by many network component vendors.

SFP+ is an innovative, next-generation transceiver module. Initially, it’s targeted to support speeds of 10 Gbps for next-generation Gigabit Ethernet applications (10G SFP) and eight.5Gbps Fiber Channel systems. What is more, SFP+ is by using lower power consumption for under 1W which is even economical. These transceivers are with managed digital optical monitoring and superior high temperature performance.

Several industrial acknowledged standards for SFP+ has been released for 10Gpbs networks, including 10Gbase-SR, which define the SFP+ transceiver working with OM3 10G multimode fiber at 30 to 300 meters range, 10Gbase-LR which define the SFP+ transceiver dealing with single mode fiber at 10km range, 10Gbase-LRM which define the FDDI multimode fiber at around 220 meters range. These 3 versions of SFP+ are generally called SFP-10G-SR, SFP-10G-LR and SFP-10G-LRM for brief in Cisco SFP+ series. Click to buy Cisco SFP-10G-SR from Fiberstore.

In comparison to earlier XENPAK or XFP modules, SFP+ module is by using more compact size compared with the former 10G transceivers such as X2 and XENPAK, leaving more circuitry to become implemented around the host board rather than inside the module. SFP+ manily has three advantages. First, it has a more compact form factor package than X2 and XFP. Second, it can connect with exactly the same data rate of XFP, X2 And XENPAK directly. Third, the cost of SFP+ is lower than XFP, X2 And XENPAK.

SFP+ transceiver is interchangeable with SFP transceiver and can be used in exactly the same cages as SFP transceiver. For 10G applications, SFP+ transceiver includes a smaller footprint minimizing power consumption than XFP transceiver. The electrical interface towards the host board for SFP transceiver and SFP+ transceiver is the same serial.

Many companies, such as Cisco, have released SFP+ transceivers. SFP+ ensures the 10Gbps data transmission and the most densely installation capability as well as the lowest cost. Currently it is well known as the best option for the 10Gbps fiber optic transceivers. Included in this, Cisco SFP+ transceiver may be the mainstream market. Cisco 10Gbase SFP transceivers are used for high speed 10Gigabit Ethernet, linking the gear to fiber optic networks. Cisco SFP+ products include active SFP+ cables and SFP+ transceivers. There is also copper transceiver offered by Cisco.

Tips: the Cisco SFP transceivers mentioned in this article are Cisco compatible SFP plus transceivers which are manufactured by FiberStore.