11 votes
Accepted

Can I use an OM3 fiber optics cable on 1gb transceiver J4858C?

EDIT: Fixing answer now that I'm on a real laptop. Yes, OM3 is just "laser optimized" multimode, it will work with both your optic and distance. What are the limitations in terms of bandwidth/...
  • 6,450
8 votes
Accepted

Is it possible to permanently damage optical transceiver if Rx signal is too strong?

Your biggest risk comes from Single Mode ER (40 Km) and ZX (80 Km) optics, which can overdrive and even burn inputs without sufficient attenuation. There is no risk of burning Multi Mode optics, as ...
6 votes
Accepted

Single-mode cross-connect -- link light off

Many types of fiber connections, including 1000base-LH/LX, use two strands of fiber. However the strands are actually used individually as dedicated TX and RX on each and the traffic on each strand ...
  • 26.8k
6 votes
Accepted

Cisco 2960-X Discover SFP Modules Without Rebooting

Maybe these bugs are affecting you: CSCuj74167 (Gigabyte link from WS-C2960X-48FPD-L not coming up when using GLC-SX-MM) applies to you. Fixed in software release 15.0(2)EX4. CSCul88801 (1G or 10G in ...
  • 655
6 votes

Are all same type fiber optic transceiver compatible?

1000BASE-LX is a standard the same way 1000BASE-T is. You expect any copper interfaces with 1000BASE-T to interoperate, and you should expect the same thing with fiber 1000BASE-LX interfaces.
  • 94.6k
6 votes
Accepted

LC dual pair converter to 10GBASE-T

If using dual pair LC fiber to run 10GbE over a long distance, what's the best way to connect it to a server on one end which has a 10GBASE-T port? The best way is to get a server NIC with SFP+ slots ...
  • 94.6k
5 votes
Accepted

Non-HP transceiver and HP switch

from comment HPE switches with pre-16.x firmware require original or HP-compatible transceivers. A transceiver that's not HPE branded is not activated when inserted, as indicated by LED and in the ...
  • 72.8k
5 votes
Accepted

Why is XGMII little endian while the network is in big endian?

Please realize that ethernet and IP were created by different people without knowledge of what the other was doing, and are today maintained by different organizations (ethernet=IEEE, IP=IETF). When ...
  • 94.6k
4 votes
Accepted

Fiber Type and transceiver model required

You don't need to be concerned with how any ISP runs their network. All that matters to you is what they hand-off. ISP A gave you MM/10G-SR; ISP B is giving you SM/10G-LR. You will need new fiber ...
  • 29.8k
4 votes

Is SFP Transceiver on a Cisco switch must be a Cisco?

There is a "service unsupported-transceiver" configuration command that you can apply (at least on some models and IOS versions) which will allow you to continue to use transceivers manufactured by ...
  • 2,396
4 votes
Accepted

How to use" Multimode SFP GLC SX MMD" in Cisco Catalyst 2960 S connected LAN and single mode OFC network

You have a multi-mode transceiver, and it will not work with single-mode fiber, and it uses a different wavelength than what you are connecting to on the other end. There is no configuration to make ...
  • 94.6k
4 votes
Accepted

Cisco/Meraki switch SFP compatibility and dual link

It is the standard that you look for. In this case, it is 1000BASE-SX. Both of those transceivers use that standard, so they are compatible. It is much the same as Intel and 3Com 1000BASE-T copper ...
  • 94.6k
4 votes
Accepted

does fiber optic transmit data as fast as light?

From Wikipedia: A typical singlemode fiber used for telecommunications has a cladding made of pure silica, with an index of 1.444 at 1500 nm, and a core of doped silica with an index around 1.4475.[...
  • 63.4k
3 votes

How can 1000BaseT transmit on Rx & receive on Tx pins?

In 1000base-T there is circuitry called a hybrid which make the signal bidirectional. It's not really transmitting and receiving the wrong way round on the receive and transmit pairs, it's ...
  • 15.9k
3 votes

Is SFP Transceiver on a Cisco switch must be a Cisco?

Now you don't have to buy a Cisco transceiver but you can't plug any transceiver either. The transceiver firmware must include a Cisco specific tag to be recognized by the switch / router. So when ...
  • 18.5k
3 votes

How can 1000BaseT transmit on Rx & receive on Tx pins?

Why couldn't 10-BaseT (10Mb/s) or 100-BaseT (100Mb/s) do the same? What changed, specifically to allow this? The quality of the cabling improved drastically as well as the methods for transmitting ...
  • 269
3 votes

Are all same type fiber optic transceiver compatible?

While this is true on the fiber side of the system, and SHOULD be true on the thing with the transceiver socket (SFP, typically, for current Gigabit stuff) it is evidently not always true for certain ...
  • 2,736
3 votes
Accepted

SFP compatibility on QLogic FC HBA and Cisco FC SFPs

If it accepts the HP branded ones, it will likely accept the Cisco tagged one as well. If the HP one is multi-rate (and almost always are), it should work at whatever speed both sides can support. (i....
  • 29.8k
2 votes

"Overclocking" a 10BASE-T ethernet controller

If you aren't at all concerned with interoperability with other devices, you could try to do what you want, but increasing the clock also means that the other end needs to be identically configured, ...
  • 94.6k
2 votes
Accepted

sh int transceiver Explanations

Differences in manufacturing and different types of optics ( SR,LR, ZR.. Brands.. ) It is dependent on the specific optic ( varies per each unique optic ), it is specified for the type of transceiver ...
2 votes
Accepted

How "show inventory" displays SX SFP?

If you have an SFP module inserted, you will see the specific type. You can choose to specifically use the inserted SFP, or choose to use the built-in copper connector, with the media-type interface ...
  • 94.6k
2 votes

5GbE over fiber optic cable with SFP+

Both 5 Gbps and 8 Gbps are non-standard ethernet speeds, and you won't find those speeds on SFP+s. In fact, you will not find 8 Gbps ethernet at all. If you are using fiber, you will get 10 Gbps, but ...
  • 94.6k
2 votes

Are all same type fiber optic transceiver compatible?

Unless you want to connect one SMode transceiver with a MMode transceiver, you will get your link UP, because they are standars of the market, and only can be negative the transmision distance from ...
2 votes

AOC cables for Brocade Fiberchannel

You will need to check your switch's manual or compatibility list. Not all switches (and firmware versions) are compatible with AOC cables. Additionally, 10 Gb cables are not guaranteed to work with ...
  • 72.8k
2 votes

How can 1000BaseT transmit on Rx & receive on Tx pins?

Broadband (xDSL) uses frequency-division multiplex (FDM) to separate receive and transmit direction - both use their own frequency sub-band. Ethernet 1000BASE-T and faster use telecom hybrids to ...
  • 72.8k
2 votes

Can 40GBASE-LR4 be used for 4x10G?

Just for people looking at this answer now (close to 3 years after the original answers): today you can get QSFP+ PLR4 transceivers that support 4x10G breakout over SMF (long range). These ...
2 votes

Transceiver for MM links up to 2k

Simply searching the Cisco web site produces the answer. According to Cisco 100-Megabit Ethernet SFP Modules Compatibility Matrix, that transceiver is compatible with your switch: The GLC-GE-100FX ...
  • 94.6k
2 votes

How to use QSFP28 transceiver with 100G datacenter?

There's a wide (and growing) range of 100G PHYs. You need to get a transceiver that is compatible with the DC uplink, e.g. 100GBASE-SR4 or -LR4. The transceiver you've linked to states "100GBASE-IR4" ...
  • 72.8k
2 votes

SFP to RJ45 for 10Gbit network

First a 10 Gbps network adapters use SFP+, not SFP. Next, you can get a 10GBase-T SFP+ module for your adapter, rather than one of the fiber variants. In most cases, 10 Gbps adapters will have SPF+ ...
  • 94.6k
2 votes

does fiber optic transmit data as fast as light?

As fiber optic transmit data using light. So we are getting/sending data at the speed of light ?? The speed of light in fiber is not the same as the speed of light in free space. Typically the speed ...
  • 11.8k

Only top scored, non community-wiki answers of a minimum length are eligible