Difference between sfp 10g sr and sfp 10g sr s
The difference between SFP 10G SR and SFP 10G SR S is that SFP 10G SR S is a Cisco proprietary version of SFP 10G SR. Although they both have the same specifications and support 10 Gigabit Ethernet, SFP 10G SR S is compatible only with Cisco devices while SFP 10G SR is compatible with a wide range of other vendors' devices.

Technically I do not see any major difference between the "SFP-10G-SR-S" and "SFP-10G-SR". Both support 50micron OM3 till 300meter and we will be going with OM3. This is for a campus infrastructure with the links being used in 10 Gig mode and as L3 links only. the S-class is a recommended and much more inexpensive option.
The non-S class are only indicated for environments requiring any of the following:
• OTN or WAN-PHY support
• Optics deployed in non-temperature controlled environments, e.g. rugged/ industrial (RGD)
• Optics plugged on platforms that require extended operating temperature range (EXT)
• TAA compliance

What is SFP-10G-SR

SFP-10G-SR is typically used as a part number by Cisco. According to Cisco, it is 10GBASE-SR SFP+ Module supports a link length of 26m on standard Fiber Distributed Data Interface (FDDI)-grade Multimode Fiber (MMF). SFP-10G-SR is a hot-swappable input/output device which allows a 10 Gigabit Ethernet port to link with a fiber optic network. SFP-10G-SR is also used as the replacement model of compatible 10GBase-SR SFP+ Transceiver with the same function and performance supplied by many other 3rd party suppliers and stores.

What is SFP-10G-SR-S

Like as SFP-10G-SR, SFP-10G-SR-S is typically used as the part number of Cisco S-Class 10GBASE-SR SFP+ Module. The main difference between SFP-10G-SR and SFP-10G-SR-S is the different features. According to Cisco, S-class optics is an inexpensive option designed for enterprise and data center 10G and 40G applications. The S class is suitable for the below environment: in non-temperature controlled environments, e.g. rugged/ industrial (RGD), Optics plugged on platforms that require extended operating temperature range (EXT), TAA compliance.
Another difference is the price, SFP-10G-SR-S is offered with a more attractive price. That is because of SFP-10G-SR-S does not display several unnecessary features like as SFP-10G-SR.
SFP-10G-SR-S is also used as the replacement model of compatible low price 10GBase-SR SFP+ Transceiver with the same function and performance supplied by many other 3rd party vendors and suppliers. It usually works with selected Cisco switches.

 

SFP-10G-SR-S vs SFP-10G-SR, Why Choose One Over the Other?

SFP-10G-SR is a popular 10G SFP+ optical transceiver in terms of quantity used. It is considered as the mainstream form factor of the 2017 market due to its matured technology and reduced price, even although 40G/100G optical modules are on the very top trend for enterprise and data center for the interconnection. But two years ago, Cisco introduced S-class optics such as SFP-10G-SR-S for enterprise and data center applications. For some web searchers, he will be recommended with SFP-10G-SR-S rather than SFP-10G-SR. But they almost share the same characteristics, so SFP-10G-SR-S vs SFP-10G-SR, why choose one over the other? Hope this post may give some clue.

SFP-10G-SR-S vs SFP-10G-SR: Similarity

Seemingly and technically, they don’t have much difference. SFP-10G-SR-S shares the same product specification with SFP-10G-SR. SFP-10G-SR is compliant with 10GBASE-SR standard. The Cisco 10GBASE-SR module supports a link length of 26m on standard Fiber Distributed Data Interface (FDDI)-grade multimode fiber, up to 300m link lengths over OM3 and 400m link lengths over OM4 cables.
 
 
 
Cisco SFP-10G-SR transceiver is hot-swappable input/output device which allows a 10 Gigabit Ethernet port to link with a fiber optic network. Because it is hot-swappable and MSA compliant, the Cisco SFP-10G-SR transceiver can be plugged directly into any Cisco SFP+ based transceiver port, without the need to power down the host network system. This capability makes moves, add-ons and exchanges quick and painless.

SFP-10G-SR-S vs SFP-10G-SR: Difference

According to Cisco, S-class optics are intended for enterprise and data center 10G and 40G applications This new set of optics does not display several unnecessary features for these applications, bringing about a more attractive price. That explains why SFP-10G-SR-S price is lower than SFP-10G-SR price.

Except the price, there are some other differences. SFP-10G-SR-S optics aren’t TAA certified. However, the non-S-class optics such as SFP-10G-SR are all compliant to TAA. SFP-10G-SR-S optics only have COM (Commercial temperature range: 0~70℃). However, the temperature range of SFP-10G-SR can be EXT (Extended temperature range: -5~85℃), IND (Industrial temperature range: -40~85℃) and Storage temperature range (-40~85℃).

In terms of protocols, SFP-10G-SR-S optics use Ethernet only, they cannot use OTN (Optical Transport Network) or WAN-PHY (Wide Area Network Physics). Furthermore, SFP-10G-SR-S optics just have 10G and 40G applications so far which is specified for 10G and 40G enterprise and data center. Thus, if you don’t need any special features like extra tolerance for temperature, S-Class optics can save you a considerable amount of money.

SFP-10G-SR Price Comparison

Since equipment SFP-10G-SR vendors all rely on MSAs when designing their transceivers, every supplier can produce the transceiver modules with the same functions but with different prices. Unless you have a 100% requirement to buy Cisco, there are a lot of 3rd party compatible vendors out there that you can save a lot of money by using. Here is a price list from different vendors for you to choose from.
 

Vendor	Model	Brand	Price
CDW	SFP-10G-SR	Cisco	$693.99
Router-Switch	SFP-10G-SR	Cisco	$262.00
Monoprice	SFP-10G-SR	Ironlink	$136.75
10Gtek	SFP-10G-SR	10Gtek	$41.05
seesuo.com	SFP-10G-SR	FS.COM	$16.00

SFP-10G-SR-S vs SFP-10G-SR, Which Will You Choose?

Although SFP-10G-SR-S vs SFP-10G-SR, they share identical specification, there still are some minor difference. In most cases, SFP-10G-SR-S optics are recommended for 10G and 40G applications due to its low cost. both SFP-10G-SR price and SFP-10G-SR-S price is relatively lower according to the above chart, and they also enjoy good quality. If you need any third-party optical modules or fiber optic cables, give FS.COM a shot.