Tag Archives: 1000BASE-SX

What’s the Difference: 10GBASE-SR vs 1000BASE-SX

As the development of fiber optic network, there appears lots of industry standards for fiber optic transceivers. Although transceivers with different standards may have different features and performance, they sometimes can be used in the same switch port. Thus, many people may get confused by these transceivers. For example, 10GBASE-SR and 1000BASE-SX transceivers can both be inserted into the Cisco Catalyst 2960S-48TD-L switch, but the 10GBASE-SR transceiver may not work fine with the 1000BASE-SX module in another switch. Why? This post will discuss 10GBASE-SR vs 1000BASE-SX and whether 10GBASE-SR transceiver can down-support connect to 1000BASE-SX transceiver.

connect 10GBASE-SR to 1000BASE-SX


As mentioned above, 10GBASE-SR and 1000BASE-SX are two kinds of industry standards for fiber optic transceivers. This part will introduce them in turns.


10GBASE-SR is defined in the IEEE 802.3 Clause 49 standard, specially designed for multi-mode fiber optic medium that uses 850 nm lasers. It has a data transmission rate of up to 10.3125 Gbps and can be used over multiple cabling options. But the transmission distance may differ as the fiber cable changes. For example, when used over OM1 cabling, the 10GBASE-SR has a maximum working distance of 33 meters, as opposed to 82 meters when applied over OM2 cabling. Nowadays, the 10GBASE-SR module usually applied over OM3 and OM4 cablings to give a more structured optical cabling used in large buildings. And the transmission distance respectively are 300m and 400m.


Like 10GBASE-SR, 1000BASE-SX is also an IEEE 802.3z standard for the multi-mode fiber optic cabling. But it has a minimum transmission distance of 220m and a maximum of 550m. Offering 1Gbps data transmission rate, 1000BASE-SX modules are mainly used to connect high-speed hubs, Ethernet switches, and routers together in different wiring closets or buildings using long cabling runs.

Can 10GBASE-SR Transceiver Down-Support Connect to 1000BASE-SX Transceiver?

10GBASE-SR modules are generally referring to 10GBASE-SR SFP+ transceivers, and 1000BASE-SX modules are usually 1000BASE-SX SFP transceivers. And since SFP+ and SFP transceivers share the same size (as shown below), SFP transceivers can often used in most SFP+ ports (For example, almost all SFP+ ports of Cisco switch can accept SFP transceivers). Then can a 10GBASE-SR SFP+ transceiver down-support connect to the 1000BASE-SX SFP transceiver?


10GBASE-SR vs 1000BASE-SX Transceivers

The answer is no. Unlike copper SFP transceivers, 10GBASE-SR SFP+ transceivers do not have such functions as auto-negotiation. In fact, both 10GBASE-SR SFP+ and 1000BASE-SX SFP transceivers can only run at the rated speed fixed by the electro-optical conversion ASIC built into the transceiver hardware. That’s to say, 10GBASE-SR SFP+ transceivers can only run at 10Gbps and 1000BASE-SX SFP transceivers run at 1Gbps. So there is no such fiber link that one end does 1G while the other end does 10G.

10GBASE-SR vs 1000BASE-SX: Have You Known the Differences?

To conclude, although 10GBASE-SR and 1000BASE-SX share something in common, they are totally different Ethernet standards for transceivers. 10GBASE-SR SFP+ transceivers mainly work in 10G links, while 1000BASE-SX transceivers can only run at 1Gbps even though in the SFP+ slot. Thus, it will not work out to connect a 10GBASE-SR SFP+ transceiver with a 1000BASE-SX SFP transceiver.

Connect Cisco Catalyst 3750 Series Switches to Network

Cisco Catalyst 3750 series switches are widely used in today’s access layer of the network, which can provide Ethernet speed of Gigabit. There are a variety of configurations in this series of Cisco switches. They can fit different applications and offering forward data rates from 32G to 128G by using Cisco StackWise technology. It is an economical solution to many midsize enterprises and office. However, to make full use of these switches, how to connect them to network becomes very important. This post will illustrate Cisco Catalyst 3750 series switches connection in details.

Cisco catalyst 3750 and optics

Do You Know Cisco Catalyst Series Switches?

The ports on switches decide what types of connectors and cables can be connected with the switches. Thus, let’s get a close look at Cisco Catalyst 3750 switches ports details first. As mentioned, one of the biggest advantages is that Cisco Catalyst 3750 can support Cisco StackWise technology. Up to nice physical Catalyst 3750 switches can be interconnected into one logical switch with a high performance of 32G or 128G. This is largely depending on the StackWise ports on the rear panel of the switch as shown in the following picture.

Cisco Catalyst 3750G-48TS rear panel

Another great advantage of Cisco Catalyst 3750 switch is its great flexibility and adaptability owning to its various configurations. The Ethernet ports of Cisco Catalyst 3750 can support data rage from 10M to 1G. For instance, or example, Cisco Catalyst 3750G-12S contains 12 SFP ports, Cisco Catalyst 3750G-24TS-1U has 24 Ethernet 10/100/1000 ports plus 4 SFP uplinks in 1 rack unit (RU) height, Cisco Catalyst 3750G-48PS is armed with 48 Ethernet 10/100/1000 ports with IEEE 802.3af PoE and 4 SFP uplinks. The following picture shows the detailed ports information of Cisco Catalyst 3750G-48TS, which has 48 Ethernet 10/100/1000 ports and 4 SFP uplinks.

Cisco Catalyst 3750G-48TS front panel

Connecting Cisco Catalyst 3750 Series Switch to Network

There are mainly two types of ports on Cisco Catalyst 3750 switches: RJ45 and SFP. Different cables and connectors are used to connect the switches to network. The following will offer detailed information about how to connect these ports.

Cisco Catalyst 3750 Switch 10/100/1000 Ports Connection

10/100/1000 Ports on Cisco Catalyst 3750 are RJ45 ports, which should be connected with copper cables (as shown in the following picture). For different applications, the cable types are also different. For example, when connecting Cisco Catalyst 3750 to workstation, servers, router, the straight-through cables are suggested to use with RJ45 connector. When it the switch is connected to repeaters, crossover cable is recommended. When connecting to 1000Base-T-compatible devices, be sure to use a twisted four-pair, Cat5 cable.

Cisco Catalyst 3750 RJ45 connection
Cisco Catalyst 3750 Switch SFP Module Ports Connection

Most Cisco Catalyst 3750 switches have several SFP ports on their front panel. They can support Gigabit Ethernet, by using SFP modules related. Both copper and fiber optic links can be built with these ports and SFP modules. If connected with fiber optic 1000Base-LX or 1000Base-SX SFP modules a link supporting Gigabit Ethernet based on fiber optic can be built. If connected with copper SFP module like 1000Base-T, a copper link will be built. The following picture illustrates the connections with fiber optic SFP module port and Copper SFP module port from left to right separately.

Cisco catalyst 3750 SFP port connection

Cabling Solution for Cisco Catalyst 3750 Series Switches

More related cables and modules that Cisco Catalyst 3750 switches supporting are listed in the following chart for your reference.

Port Type
Data Rate
Connectors/Modules & Cables
RJ45 Ports 10BASE-T ports  RJ-45 connectors, two-pair Cat 3, 4, or 5 unshielded twisted-pair (UTP)
10BASE-T PoE ports  RJ-45 connectors, two-pair Cat 3, 4, or 5 UTP cabling power pins 1, 2 (negative) and 3, 6 (positive)
100BASE-TX ports  RJ-45 connectors, two-pair Cat 5 UTP
100BASE-TX PoE ports  RJ-45 connectors, two-pair Cat 5 UTP, power on pins 1, 2 (negative) and 3, 6 (positive)
SFP Ports 100M GLC-GE-100FX LC duplex, MMF
GLC-FE-100LX LC duplex, SMF
GLC-FE-100BX-D LC simplex, SMF
1G GLC-SX-MM LC duplex, MMF
GLC-BX-U LC simplex, SMF
GLC-T RJ-45, Cat 5

All the above mentioned products are fully tested in FS.COM Test Center. Please contact sales@fs.com for more details.

Transceiver Modules FAQ Pool

In the last few weeks, we have respectively introduced transceiver modules from different aspects or some famous brands. I hope all these knowlegde will give you some help during your using or working with the transceiver modules. Today, we do not plan to begin a new topic about the transceiver modules, but make a summary of the FAQ of the transceiver modules. Though some of them are simple, this paper is mainly intended to help both new and experienced technicians as a learning tool and a reference source for better understanding or using the transceiver modules.

Ok, the following contents are all the frequently asked questions and the corresponding answers, we will introduce them from easy to difficult.

Q:What is Transceiver Module?
A:Transceiver module is the combination of a transmitter and a receiver into a single device which acts to connect the electrical circuitry of the module with the optical or copper network. In addition, most transceiver modules are hot-swappable I/O (input/output) devices which plug into module sockets. As we know, devices such as routers, switches, or network interface cards modules provide one or more transceiver module slot (e.g GBIC, SFP, XFP etc.), into which you can insert a transceiver module that is appropriate for that connection. The optical fibre, or wire, plugs into a connector on the transceiver module. There is a variety of transceiver modules available for using with different types of fiber optic patch cords, different wavelengths and different transmission distances.

Q:What does hot-swappable mean?
A:Hot-swappable is the capability of being able to disconnect and connect devices while the computer or other device is on and have those devices be detected without having to reboot the computer or device. A hot-swappable device is one which can be connected or disconnected from an electronic device without having to reboot. This is useful as it allows you to swap between transceiver modules without having to power off your device.

Q:Why would I use a Transceiver Module?
A:Transceiver modules have many uses, but much of their success lies in their inter changeability. An example would be in the event that multiple different optical technologies are used in your network, you can purchase transceiver modules when required, rather than in advance, furthermore these modules can be the specific type (wavelength) required for each link. This achieves 2 things; firstly it lowers the initial costs associated with building your network and then gives you greater flexibility in the future when expanding your network.

Transceiver modules also allow you to expand your network over distances of up to 80km, at data rates of up to 100GBase (100 Gigabit/s) when using Single Mode fibre (SMF). This allows you to connect multiple data centres, or office networks together with fibre optic cabling. The optical fibre plugs into a connector on the transceiver module, which then allows for bi-directional communication between the transceiver modules.

Another way in which transceiver modules can be used is to connect high speed peripheral devices to your network, such as NAS (Network Attached Storage) boxes or servers. In instances where the server has gigabit or greater networking capabilities, a transceiver module can be installed in a 10/100/1000 megabit switch which has an available high speed module slot. This increases the available bandwidth for the high speed device, and results in increased performance.

Q:What are the main types of Transceiver Module?
A:Transceiver modules are available in various form factors, and can be optical (fibre optic) or designed for copper wiring. Different transceiver modules support different data rates, from 100Base (100 Mbit/s) up to 100GbE (100 Gbit/s). There are some common types of transceiver modules as the following:

  • Gigabit interface converter (GBIC) : 1 Gigabit Ethernet
  • XENPAK : 10 Gigabit Ethernet
  • X2 : 10 Gigabit Ethernet
  • Small form-factor pluggable (SFP) : 1 Gigabit Ethernet, also known as the Mini-GBIC
  • Small form-factor pluggable (SFP+) : 10 Gigabit Small Form Factor Pluggable
  • XFP : 10 Gigabit Small Form Factor Pluggable (slightly larger than the SFP+)
  • Quad Small Form-factor Pluggable Plus (QSFP+) : 40 Gigabit Ethernet
  • C Form-Factor Pluggable (CFP) : 40 – 100 Gigabit Ethernet

Q:What tools do I need when installing a Transceiver Module?
A:The following is a list of the tools which are recommended when installing a Transceiver module:

  • A Wrist strap or similar personal grounding device designed to stop ESD occurrences.
  • An Antistatic mat or similar which the transceiver can be placed on.
  • Fibre-optic end-face cleaning tools and inspection equipment.
  • A flat head screw driver is require to install a XENPAK transceiver module.

Q:What are CWDM and DWDM Transceiver Modules?
A:Wavelength-division multiplexing (WDM) is a technology which multiplexes a number of optical carrier signals onto a single optical fiber by using different wavelengths (i.e., colors) of laser light. WDM is divided into different wavelength patterns, conventional/coarse wavelength-division multiplexing (CWDM) and dense wavelength-division multiplexing (DWDM). In general, a CWDM (coarse WDM) MUX/DEMUX deals with small numbers of wavelengths, typically eight, but with large spans between wavelengths (spaced typically at around 20nm). A DWDM (dense WDM) MUX/DEMUX deals with narrower wavelength spans (as small as 0.8nm, 0.4nm or even 0.2nm), and can accommodate 40, 80, or even 160 wavelengths. CWDM and DWDM transceiver modules are the transceiver modules which are combined the CWDM or DWDM technology. The main advantage of both CWDM and DWDM is that they allow you to expand your networks capacity without the need for physical fibre optic cabling.

Q:What is DOM support?
A:DOM, short for Digital optical monitoring, is a feature which allows you to monitor many parameters of the transceiver module in real-time. DOM allows you to monitor the TX (transmit) and RX (receive) of the module, as well as input/output power, temperature, and voltage. Network administrators can then check and ensure that the module is functioning correctly.

Q:What is a ‘Rugged’ (RGD) Transceiver Module?
A:You may be interested in the “-RGD” in the product number of some transceiver module. In fact, these are enhanced transceiver modules which have been designed for greater durability, and can operate under more extreme conditions. Rugged transceivers may feature enhanced ESD protection, and extended operating temperature range.

Q:Can I connect a GBIC to an SFP ?
A:Functions of GBIC and SFP are equal. They are different in the size, namely, GBIC is bigger than SFP. Thus, they can be connected to each other, provided that the media type is the same. For example you could connect a 1000Base-SX GBIC to a 1000Base-SX SFP using an LC/SC cable. For optical transceivers the wavelength is defined by the media type, so two different form factors with the same media type would be compatible. LC/SC cables are commonly available, and comprise an SC connector at one end, and an LC connector at the other.

Q:What are the main types of Gigabit Ethernet?
A:Gigabit Ethernet describes technologies which transmit Ethernet frames at a rate of 1 gigabit per second as defined by the IEEE 802.3-2008 standard.

Medium: Twinaxial Cabling
Distance: 25 metres

Medium: Multi-mode fibre (MMF)
Distance: 220-550 metres
Wavelength: 770-860 nm

Medium: Multi-mode fibre (MMF)
Distance: 550 metres
Medium: Single-mode fibre (SMF)
Distance: up to 5km
Wavelength: 1270-1355 nm

Medium: Single-mode fibre (SMF)
Distance: up to 10km
Wavelength: 1310 nm

Medium: Single-mode fibre (SMF)
Distance: up to 70km
Wavelength: 1550 nm

Medium: Single-mode fibre (SMF)
Distance: up to 10km
Wavelength: 1490 nm (downstream)
Wavelength: 1310 nm (upstream)

Medium: Twisted Pair (Category 5 cable or higher)
Distance: up to 100m

Medium: Twisted Pair (Category 6 cable or higher)
Distance: up to 100m

Q:What are the main types of 10 Gigabit Ethernet?
A:10 Gigabit Ethernet is 10 times faster than gigabit Ethernet, with a data rate of 10 Gbit/s which is defined by the IEEE 802.3ae-2002 standard.

10GBASE-SR (short reach)
Medium: Multi-mode fibre (MMF)
Distance: up to 300 metres
Wavelength: 850 nm

10GBASE-LR (long reach)
Medium: Single-mode fibre (SMF)
Distance: up to 10 km
Wavelength: 1310 nm

10GBASE-LRM (long reach multimode)
Medium: Multi-mode fibre (MMF)
Distance: up to 220 metres
Wavelength: 1310 nm

10GBASE-ER (extended reach)
Medium: Single-mode fibre (SMF)
Distance: up to 40 km
Wavelength: 1550 nm

Medium: Single-mode fibre (SMF)
Distance: up to 80 km
Wavelength: 1550 nm

Medium: Multi-mode fibre (MMF)
Distance: up to 300 metres
Medium: Single-mode fibre (SMF)
Distance: up to 10 km
Wavelength: 1300 nm

Medium: Copper
Distance: up to 15 metres

Q:How about Fiberstore Transceiver Modules?
A:Fiberstore provides a full set of comaptible fiber optic transceiver module solution cover all the famous brands, such as Cisco, HP, Finisar and so on, which can satisfy you with a full range of services. We guarantee the compatibility of all of our transceiver modules, and always ensure that they meet or surpass the standards set by the manufacturers of the devices in which they are intended for use. In addition, we offer a lifetime warranty on all of our modules unless otherwise stated. If you need advise on transceiver modules, or have any questions, welcome to contact us and one of the team will get back to you shortly.

Article Source: http://www.fiber-optic-transceiver-module.com/transceiver-modules-faq-pool.html