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Questions tagged [fiber]

Fiber (Fibre) generally refers to optical fiber, a very thin, flexible glass strand which is used for the transmission of optical signals in high performance networks.

An optical fiber is a very thin, flexible glass strand that transmits light along its axis, by the process of total internal reflection.
There are two main classes of optical fibre used in telecommunications applications, Single-mode Fiber (SMF) and Multi-mode fiber (MMF)

Multi-mode Fiber is mostly used for communication over short distances, such as within a building or on a campus. Typical multimode links have data rates of 10 Mbit/s to 10 Gbit/s over link lengths of up to 600 meters.

Single mode fiber is used for communication over very long distances. It is not so common in the datacenter environment.

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Some questions about SFP+ fiber networking in general

Ok. So I'm completely new to the world of fiber. I've used Ethernet all my life. We're looking to upgrade some of our infrastructure, and I'm thinking of getting a few of these: 10G Dual SFP+ NIC https://www.fs.com/products/75600.html for our…
AnonymousAdmin4729
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100Base FX and 1000Base LX - are they compatible?

I have connected a D-Link DMC-515SC media converter with a 100Base FX port to a Cisco switch with a 1000Base LX port via a single mode patch lead but having issues. Tried swapping cores but not successful. Are they compatible?
Carlo Chiarotto
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Can't get connection over fiber run

Between two server rooms on an office campus I have three pairs of fiber with an interconnect panel in the middle. Two of the three pairs were connected before I started here and are working. I cannot get a connection over the last pair for the…
NaOH
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types of SFP+ modules and cables to connect the SFP+ ports?

I did some googling about how to establish the connection between SFP+ ports. However, it seemed that there are many ways and combinations to do this. A little bit confusing. here's the problem: trying to connect datacenter server NIC(basically, the…
user53815
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Making an argument for over-provisioning fiber

I work in research university, and we are moving to a new building. I suspect that new building will be equipped with mostly 1GbE copper, 10GbE copper, and possibly 10GbE-compatible fiber. Is it reasonable to ask for 40GbE-compatible fiber for…
aaaaa says reinstate Monica
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100BASE-FX single-mode and multi-mode

First my assumptions (possibly wrong): 100BASE-FX -> Multi-mode fiber 100BASE-LX -> Single-mode fiber In fact, if I check some online information from CISCO regarding SFPs, it confirms my…
soyxan
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Cisco SG500X 10G-capable SFP+ port up at 1000Mbps

I am not an expert using SFP. I got a Cisco SG500X L3 switch with 4 SFP+ 10G ports. I got 2 mini-gbic HP AJ718A (8Gbps) and 1 fiber (HP 3PAR-10G-10M 850-200029 10Gbps). I plug the fiber into XG1 & XG2 ports (I know it's a loop but STP is enabled),…
Baud
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Problem with fiber and 3Com switch

I have a 3com 4200 switch with a fiber connection to the main server room. The link reports up on both ends, but the 4200 neither sends nor receives data on the connection. The end in the server room is sending, but this switch doesn't report…
Joel Coel
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mpo/mtp 12 and 100G

Does one mpo/mtp-12 fo can transmit 100G datas ? I have doubt because of this picture : It seems I need 24fo to get 100G. But I have a Cisco QSFP-100G-SR4-S module which says it can support 100G on a mpo-12. What i'm missing ? Does someone can…
DSX
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SonicWall, Google Fiber for business, and static IPs

I recently had to switch a SonicWall over to Google Fiber's business offering and am trying to figure out how to configure one of the 5 static IPs to point to the router itself. Google Fiber's static IPs work by assigning a dynamic IP to the WAN…
Jared
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Voice / data connections between 2 portacabins ~50m apart

Our business is taking over some new premises (currently housing multiple companies) and for at least the first year will be operating out of a pair of portacabins, around 50 metres apart. Users in both cabins will need to be on our internal LAN,…
James Green
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partly no connection over sfp+

I have a really weird problem with a fiber connection. I have 2x2 fibers OM4 G50/125 between two rooms, room A & B (fiber length approximately 20m). I have two switches, a Huawei CE6810 and a HP 2530-48G-2sfp+ (each has a sfp+ module). 1) When I…
Daniel Hermann
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What does "Is E8C Device " in Huawei's iManager U2000 mean?

I wonder what this "Is E8C Device" in the Screenshot added means it must be a Shortform or something like that but i seem to find litteraly nothing about E8C in conjunction with Huawei ONT's. The Screenshot is as the Titel tells from Huawei's…
konqui
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About 4x10G SFP+ <--> QSFP breakout cable

I have my very first Nexus switch to install in our new datacenter. It's a 3172TQ that comes with 4 QSFP+ ports. All my other devices have SFP+ modules. I did a little research and i found about the QSFP-SFP+ breakout cable. My question is: Can I…
ujemvi
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Fiber tape changer missing on lsscsi

I'm configuring a server with Bacula to manipulate backups on a Dell TL4000 connected to the server via Fiber. During the configuration of the Bacula Director I've accessed the bconsole to see if the configuration was being applied. Once I've exited…
Brosig
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