Tag Archives: SFP port

Compatible SFP for Cisco 2960 Series Switches


Cisco Catalyst 2960 series switches are available in 2960, 2960-S, 2960-SF, 2960-X and many other types. The Cisco 2960-S and 2960-SF series are the newest members of the 2960 family that offer a rich set of Layer 2 features. The 2960-S provides Gigabit Ethernet (10/100/1000) connectivity with 10G/1G SFP+ uplinks, and the 2960-SF provides Fast Ethernet (10/100) connectivity with 1G SFP uplinks. This blog mainly introduced the knowledge of 2960-SF series switches and compatible SFP modules for it.
Cisco 2960
Cisco Catalyst 2960-SF Series Switches Overview
Cisco Catalyst 2960-SF series switches deliver secure and reliable LAN access for branch and medium-sized campus deployments. They enable reliable and secure business operations and lower total cost of ownership through a range of innovative features including FlexStack, Power over Ethernet Plus (PoE+), and Cisco Catalyst SmartOperations. These series switches include 7 models. 5 models with LAN Base Software and 2 models with LAN Lite Software.

Cisco Catalyst 2960-SF Series Switches with LAN Base Software
Switch Model Description Uplinks Available PoE Power
2960S-F48FPS-L 48 Ethernet 10/100 ports with PoE+ 4 SFP 740W
2960S-F48LPS-L 48 Ethernet 10/100 ports with PoE+ 4 SFP 370W
2960S-F24PS-L 24 Ethernet 10/100 ports with PoE+ 2 SFP 370W
2960S-F48TS-L 48 Ethernet 10/100 ports 4 SFP
2960S-F24TS-L 24 Ethernet 10/100 ports 2 SFP
Cisco Catalyst 2960-SF Series Switches with LAN Lite Software
2960S-F48TS-S 48 Ethernet 10/100 ports 2 SFP
2960S-F24TS-S 24 Ethernet 10/100 ports 2 SFP

What’s the Difference Between the LAN Base and LAN Lite Switches?
The Cisco 2960-SF switches support the LAN Base and the LAN Lite software feature sets. The LAN Base feature set comes with advanced Layer 2(L2) features and is typically targeted at large enterprise customers. The LAN Lite feature set has entry-level L2 features and is targeted at mid market deployments. Following are the notable hardware differences:

  • Ease of management with Cisco FlexStack
  • Power of Ethernet (PoE/PoE+) capabilities
  • Increased number of VLANs
  • A wider selection of Small Form-Factor Pluggable (SFP) ports

Compatible SFP for Cisco 2960-SF Series Switches
By consulting the Cisco 100-Megabit Ethernet and Gigabit Ethernet SFP Modules Compatibility Matrix, I get following compatible SFP models that supported for 2960-SF series switches.

Compatible Fast Ethernet SFP Modules for Cisco 2960-SF Series Switches
Network Device Transceiver Model Description


GLC-GE-100FX 100BASE-FX SFP 1310nm 2km
GLC-FE-100FX 100BASE-FX SFP 1310nm 2km DOM
Compatible Gigabit Ethernet SFP Modules for Cisco 2960-SF Series Switches
Network Device Transceiver Model Description







GLC-T 1000BASE-T Copper RJ-45 100m
GLC-TE 1000BASE-T Copper RJ-45 100m
GLC-SX-MM 1000BASE-SX SFP 850nm 550m
GLC-LH-SM 1000BASE-LX/LH SFP 1310nm 10km
GLC-SX-MMD 1000BASE-SX SFP 850nm 550m DOM
GLC-LH-SMD 1000BASE-LX/LH SFP 1310nm 10km DOM
GLC-EX-SMD 1000BASE-EX SFP 1310nm 40km DOM
Network Device Transceiver Model Description





GLC-ZX-SM 1000BASE-ZX SFP 1550nm 70km
GLC-ZX-SMD 1000BASE-ZX SFP 1550nm 70km DOM
GLC-BX-D BiDi SFP 1490nm-TX/1310nm-RX 10km
GLC-BX-U BiDi SFP 1310nm-TX/1490nm-RX 10km
CWDM SFP 1270nm-1610nm (20nm spacing)

Cisco 2960-SF enables a wide range of business or residential applications and services. FS.COM offers all above Cisco compatible transceiver with reasonable prices and high performance. All those products are tested before shipping to ensure high quality. For more details, please visit www.fs.com or contact us via sales@fs.com.

Full CWDM Mux Demux and CWDM SFP Transceivers Solutions

CWDM systems have channels at wavelengths spaced 20 nanometers (nm) apart, compared with 0.4 nm spacing for DWDM. This allows the use of low-cost, uncooled lasers for CWDM. In a typical CWDM system, laser emissions occur on full eighteen channels at eighteen defined wavelengths: 1610 nm, 1590 nm, 1570 nm, 1550 nm, 1530 nm, 1510 nm, 1490 nm, 1470 nm, 1450 nm, 1430 nm, 1410 nm, 1390 nm, 1370 nm, 1350 nm, 1330 nm, 1310 nm, 1290 nm, 1270 nm. Besides, for CWDM systems an industry standard color coding scheme is used. The latches of the CWDM SFP transceivers match the colored port indicators on the passive units therefore guaranteeing simple setup. Following color codes and wavelength are valid for CWDM.


Full CWDM Channels (18 Channels) Mux Demux Solution

The WDM system uses a multiplexer at the transmitter to combine several wavelengths together, each one carry different signal with bite-rate up to 10G and a demultiplexer at the receiver to split them apart. Both mux and demux are passive, requiring no power supply. The 18 Channels CWDM mux demux covers all channels of 1270nm to 1610nm in 20nm increments. Without replacing any infrastructure, it totally support data rates up to 180 Gbps by being completely protocol transparent. The main fields of applications are the use in SDH (STM-1, STM-4, STM-16, STM- 64), IP (Fast Ethernet, Gigabit Ethernet, 10 Gigabit) ATM and storage (1G, 2G, 4G, 8G, 10G Fibre Channel) networks. Connectors, located on the front of the CWDM mux demux modules, are labeled and use the same color-coding that is used to indicate the wavelength of the individual CWDM SFP transceivers (shown in the figure below).


When fiber availability is limited, CWDM mux demux could increase the bandwidth on the existing fiber infrastructure. By using 18ch CWDM mux demux mentioned above and the CWDM SFP transceivers, up to 180 Gbps could be supported on a fiber pair.


Full CWDM SFP Transceivers Solution

CWDM SFP transceiver is based on the SFP form factor which is a MSA standard build. The max speed of this product is 1.25G and they are also available as 2.5G and of course the popular CWDM 10G SFP transceivers. The CWDM SFP transceiver has a specific laser which emits a “color” defined in the CWDM ITU grid. The CWDM ITU grid is defined from 1270 to 1610nm and has steps of 20nm. So the available wavelength is 1270nm, 1290nm, 1310nm, 1330nm, 1350nm, 1370nm, 1390nm, 1410nm, 1430nm, 1450nm, 1470nm, 1490nm, 1510nm, 1530nm, 1550nm, 1570nm, 1590nm and C. Besides, our CWDM SFP transceivers are similarly color-coded as the CWDM mux demux to help you match the right link connection (shown in the figure below).


We can make the CWDM SFP transceivers compatible with every brand (Cisco, HP, H3C, Juniper, Huawei, Brocade, Arista). A lot of brands have vendor locking and only with the proper coding. Fiberstore is specialized in this rebranding or recoding. We have many different switches and routers in our test lab to test the coding. We also use different Optical Spectrum Analyzers to ensure the CWDM SFP transceiver is emitting the right color and has the correct power budget. The CWDM SFP transceiver is used in combination with passive CWDM mux demux, and we can provide you a complete solution and advice on which equipment fits best in your project. Please give us your project details and we will provide the most efficient and economical solution.

1270nm SFP 1290nm SFP 1310nm SFP 1330nm SFP 1350nm SFP 1370nm SFP
1390nm SFP 1410nm SFP 1430nm SFP 1450nm SFP 1470nm SFP 1490nm SFP
1510nm SFP 1530nm SFP 1550nm SFP 1570nm SFP 1590nm SFP 1610nm SFP

Can I Use SFP Transceiver in SFP+ slot?

A common confusion about SFP and SFP+ compatibility is that if I can use the SFP module in SFP+ slot. When I connect the SFP transceiver to SFP+ transceiver, can SFP+ negotiate down to 1G? Or is it possible to use SFP+ module in the SFP port on my switch? Can SFP+ copper twinax cable can negotiate down to 1G to support SFP? Can 1G and 10G can exist in the same link? All these questions usually create a giant headache for many engineers. After looking up many relevant documentation, now I will conclusion the answers in this article.

SFP Can be Plugged into SFP+ Ports in Most Situations
I’m not sure about the specific switch model, but as a general rule of thumb, SFPs will work in SFP+ slots, but SFP+ optics do not work in SFP slots. It’s just a power availability thing. When you plug the SFP module in SFP+ port, the speed of this port is 1G not the 10G. And sometimes this port will lock the speed at 1G until you reload the switch or do some fancy set of commands. Besides, the SFP+ port usually can never support speed under 1G. That is to say, we can’t plug the 100BASE SFP in the SFP+ port. In fact, for this question, it may depend greatly on the switch models – sometimes SFPs are supported in SFP+ ports, and sometimes not. For example, almost all SFP+ ports of Cisco switch can support SFPs and many SFP+ ports of Brocade switch only support SFP+. Though it’s feasible often, it’s safer to ask your switch vendor for some information.

SFP module in SFP+ port

SFP+ Can’t Auto-negotiate Down to 1G to Support with SFP Module
To my knowledge, unlike copper SFPs which are available in 10/100/1000 auto-negotiation, optics such as SFP and SFP+ do not support auto negotiation at all. In fact, Most (95+%) SFPs and SFP+s will only run at the rated speed, no more, no less. Besides, there is no such thing as a SFP+ that does 1G on one side (towards the fiber) and then does 10G on another side (towards the unit). Though we can use SFP in SFP+ ports in many cases, that doesn’t mean a SFP+ plugged into the SFP+ port can support 1G. In a fiber link, if we plug a SFP in the SFP+ port on one side (1G), and then plug a SFP+ in the SFP+ port on the another side (10G), this may not work! You just can’t have 10 GbE at one end and 1 GbE at the other. For this question, if you use SFP+ copper twinax cable, it also can’t negotiate down to 1G.

When use SFP and SFP+ modules in your network, make sure the speed of both ends of the fiber link is the same. SFP modules may can be used in SFP+ ports, but a SFP can never be connected to a SFP+ module. For their different speeds, transmission distance and wavelength. 10 SFP+ only can use for 10G SFP+ port, and can never auto-negotiate to 1G.

Related Article: Can I Use the QSFP+ Optics on QSFP28 Port?

What Is The Difference: SFP vs SFP+

As we know, a SFP module just looks the same as the SFP+ module. And most switches can both support SFP module and SFP+ module. So, do these two modules really refer to the same one? What’s the difference between them?


SFP Definition
SFP stands for Small Form-factor Pluggable. It is a hot-pluggable transceiver that plugs into the SFP port of a network switch and supports SONET, Gigabit Ethernet, Fibre Channel, and other communications standards. SFP specifications are based on IEEE802.3 and SFF-8472. They are capable of supporting speeds up to 4.25 Gbps. Due to its smaller size, SFP replaces the formerly common gigabit interface converter (GBIC). Therefore SFP is also called Mini-GBIC. By choosing different SFP module, the same electrical port on the switch can connect to different fiber types (multimode or single-mode) and different wavelengths.

SFP module Cisco

SFP+ Definition
Since SFP supports only up to 4.25 Gbps, SFP+ that supports data rates up to 16 Gbps was later introduced. In fact, SFP+ is an enhanced version of the SFP. The SFP+ specifications are based on SFF-8431. In today’s most applications, SFP+ module usually supports 8 Gbit/s Fibre Channel, 10 Gigabit Ethernet and Optical Transport Network standard OTU2. In comparison to earlier 10 Gigabit Ethernet XENPAK or XFP modules, SFP+ module is smaller and becomes the most popular 10 Gigabit Ethernet module in the market.

SFP+ module Cisco

Review the SFP and SFP+ definition mentioned above, we can know that the main difference between SFP and SFP+ is the data rate. And due to different data rate, the applications and transmission distance is also different.

Ethernet Application

SFP (1Gbps) SFP+ (10Gbps)
1000BASE-SX SFP 850nm 550m

1000BASE-LX/LH SFP 1310nm 20km

1000BASE-EX SFP 1310nm 40km

1000BASE-ZX SFP 1550nm 80km

10GBASE-SR SFP+ 850nm 300m

10GBASE-LRM SFP+ 1310nm 220m

10GBASE-LR SFP+ 1310nm 10km

10GBASE-ER SFP+ 1550nm 40km

10GBASE-ZR SFP+ 1550nm 100km

Fiber Channel Application

SFP (2G, 4G) SFP+ (8G)

2G Fibre Channel SFP 1310nm 2km/15km/20km/40km

2G Fibre Channel SFP 1510nm 80km


4G Fibre Channel SFP 850nm 150m

4G Fibre Channel SFP 1310nm 5km/10km/15km/20km


8G Fibre Channel SFP+ 850nm 150m

8G Fibre Channel SFP+ 1310mn 10km/20km/40km

8G Fibre Channel SFP+ 1510nm 80km

SONET/SDH Application

SFP (155Mbps, 622Mbps, 2.5Gbps) SFP+ (10G)

OC-3/STM-1 1310nm 2km/15km/40km

OC-3/STM-1 1510nm 80km


OC-12/STM-4 1310nm 500m/2km/15km/40km

OC-12/STM-4 1510nm 80km


OC-48/STM-16 1310nm 2km/15km/40km

OC-48/STM-16 1510nm 80km

OC-192/STM-64 850nm 300m

OC-192/STM-64 1310nm 2km/10km/20km/40km

OC-192/STM-64 1510nm 80km

Usually, SFP module plugs into SFP port of the switch and SFP+ module plugs into SFP+ port of the switch. But, sometimes SFP module can also be plugged into SFP+ port. Which SFP or SFP+ module should you choose all depends on your switch types. Fiberstore is a reliable SFP transceiver module manufactures, all SFP module and SFP+ module types are available in FS.COM. Besides, SFP+ cable is also provided. What’s more, the price of SFP module and SFP+ module is lower than many other manufactures. SFP test is strict in FS.COM. Matching fiber patch cable is also available.

Related Article: Compatible SFPs for Ubiquiti EdgeSwitch and UniFi switch

Use Cisco Compatible DWDM SFP+ to Connect DWDM Transport to Your Cisco 10G Switches

Dense Wavelength Division Multiplexing (DWDM) enables carrier’s networks to accommodate many hundreds of aggregated services of any sub-rate protocol without installing additional dark fiber. DWDM SFP+ transceiver is mainly manufactured for carriers and large enterprises that need a scalable, flexible, cost-effective system for multiplexing, transporting and protecting high-speed data, storage, voice and video applications. The Cisco compatible 10G DWDM SFP+ transceiver modules are fiber line cards for a wide variety of Cisco switches, routers, and other equipment. They allow enterprises and service providers to provide scalable and easy-to-deploy 10-Gbps LAN, WAN, and optical transport network (OTN) services in their networks.

According to DWDM ITU (ITU-T G.694.1) channels, Cisco DWDM SFP+ transceivers are provided with 40 channels, from C20 1561.41nm to C59 1530.33nm (shown in the table below).

PN. ITU Channel PN. ITU Channel PN. ITU Channel
DWDM-SFP10G-61.41 C20 1561.41 nm DWDM-SFP10G-50.12 C34 1550.12 nm DWDM-SFP10G-38.98 C48 1538.98 nm
DWDM-SFP10G-60.61 C21 1560.61 nm DWDM-SFP10G-49.32 C35 1549.32 nm DWDM-SFP10G-38.19 C49 1538.19 nm
DWDM-SFP10G-59.79 C22 1559.79 nm DWDM-SFP10G-48.51 C36 1548.51 nm DWDM-SFP10G-37.40 C50 1537.40 nm
DWDM-SFP10G-58.98 C23 1558.98 nm DWDM-SFP10G-47.72 C37 1547.72 nm DWDM-SFP10G-36.61 C51 1536.61 nm
DWDM-SFP10G-58.17 C24 1558.17 nm DWDM-SFP10G-46.92 C38 1546.92 nm DWDM-SFP10G-35.82 C52 1535.82 nm
DWDM-SFP10G-57.36 C25 1557.36 nm DWDM-SFP10G-46.12 C391546.12 nm DWDM-SFP10G-35.04 C53 1535.04 nm
DWDM-SFP10G-56.55 C26 1556.55 nm DWDM-SFP10G-45.32 C40 1545.32 nm DWDM-SFP10G-34.25 C54 1534.25 nm
DWDM-SFP10G-55.75 C27 1555.75 nm DWDM-SFP10G-44.53 C41 1544.53 nm DWDM-SFP10G-33.47 C55 1533.47 nm
DWDM-SFP10G-54.94 C28 1554.94 nm DWDM-SFP10G-43.73 C42 1543.73 nm DWDM-SFP10G-32.68 C56 1532.68 nm
DWDM-SFP10G-54.13 C29 1554.13 nm DWDM-SFP10G-42.94 C43 1542.94 nm DWDM-SFP10G-31.90 C57 1531.90 nm
DWDM-SFP10G-53.33 C30 1553.33 nm DWDM-SFP10G-42.14 C44 1542.14 nm DWDM-SFP10G-31.12 C58 1531.12 nm
DWDM-SFP10G-52.52 C31 1552.52 nm DWDM-SFP10G-41.35 C45 1541.35 nm DWDM-SFP10G-30.33 C59 1530.33 nm
DWDM-SFP10G-51.72 C32 1551.72 nm DWDM-SFP10G-40.56 C46 1540.56 nm
DWDM-SFP10G-50.92 C33 1550.92 nm DWDM-SFP10G-39.77 C47 1539.77nm

In fact, mot all Cisco switches can be supported for DWDM SFP+ transceivers. According to Cisco 10-Gigabit Ethernet Transceiver Modules Compatibility Matrix, there are 72 types of Cisco switches are available to support DWDM SFP+ transceivers. But only 19 of them can support be supported all 40 channels DWDM SFP+ transceivers (shown in the table below).

Switches Series Models
Cisco Nexus 3000 Series N3K-C3016Q-40GE, N3K-C3064PQ-10GE, N3K-C3064TQ-10GT, N3K-C3064PQ-10GX
Cisco Nexus 3100 Series N3K-C3132Q-40GE, N3K-C3132Q-40GX, N3K-C3132Q-XL, N3K-C3132Q-V, N3K-C3172PQ-10GE, N3K-C3172TQ-10GT, N3K-C3172PQ-XL, N3K-C3172PQ-XL, N3K-C3172TQ-XL, N3K-C31108PC-V, N3K-C31108PC-V
N3K-C31108TC-V, N3K-C31128PQ-10GE
Cisco Nexus 3200 Series N3K-C3264Q, N3K-C3232C
Cisco Nexus 3500 Series N3K-C3548P-10G , N3K-C3524P-10G, N3K-C3548P-10GX, N3K-C3524P-10GX

To build a complete DWDM network in your system, except for switches and DWDM SFP+ transceivers, you also usually need a DWDM mux/demux module. At present, DWDM mux/demux modules are available in 2 channels to 96 channels. Since Cisco DWDM SFP+ transceivers are available in 40 channels (from C20 1561.41nm to C59 1530.33nm ), now I will take 40 channels C20-C59 DWDM mux/demux module (show in the figure below) for example to explain how it works.

40 channels DWDM mux demux

Front panel of above 40 channels C20-C59 DWDM mux/demux module are shown in the figure below. Connectors, located on the front of the DWDM mux/demux modules, are labeled and use the same channel that is used to indicate the wavelength of the individual DWDM transceivers.

DWDM muxdemux
Use a pair of 40 channels C20-C59 DWDM mux/demux modules, 40 signals can be transmitted over one fiber pair, which greatly reduces the cabling cost.

40 DWDM muxdemux
Now, let’s use Cisco compatible DWDM SFP+ to connect DWDM transport to your Cisco 10G switches!

Cisco Compatible DWDM SFP+