Questions tagged [fiber]

Fiber optic data transmission, cabling, connectors, interfaces. Questions should have this tag if they directly involve fiber optic transmission of data, fiber optic cabling and/or connectors, or interface devices directly attached to fiber optic cable.

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62 views

SFP-10G-LRM compatible with Single Mode Fiber?

I just started working with new company and found they are using SFP-10G-LRM with single mode fiber. How could this be? I thought since the SFP-10G-LRM is Multimode, it can't work with single mode ...
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4answers
103 views

does fiber optic transmit data as fast as light?

I dont know where to ask this question. So i think its best suited for networking community. As fiber optic transmit data using light. So we are getting/sending data at the speed of light ?? I did ...
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2answers
53 views

Does a SFP port indicator goes on when receiving or transmitting or both

My questions are on the bottom, feel free to skip my debugging story if you're in a hurry. Story I started to check a network spanning tree status. All switches are connected on fiber, through SFP ...
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2answers
48 views

understanding fiber optics layers architecture

I'm studying the history and technical details about fiber optics and I'm having trouble understanding which are the different layers that exist and have been used over fiber optics. For example, I ...
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1answer
27 views

SFP LC to LC path code recommendation [closed]

I need to connect to Ubiquiti (router > Switch) using SFP. I believe I need a Ubiquiti Networks UF-SM-1G-S transmitter (BiDi). the cable will be around 40M long and crossing the house, underneath ...
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1answer
58 views

new SFP network for newbies

I never really sealed with SFP before but I want to created a new fibre network. Can SFP just be plug & play like ethernet or do you need a lot of knowledge ? I assume it's carry the normal IP/...
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1answer
92 views

Is PPP a useful choice for fiber connections?

I was recently thinking about how I would go about connecting two separate buildings using optical fiber cables. This is mostly for understanding how this would be done to further my mental horizon, ...
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1answer
121 views

Will OM4 Fiber Work with my 1GbE Fiber Transceiver?

What is the fastest cabling that can be used to connect the transceiver that Meraki calls the 1GbE SFP SX Fiber Transceiver? Source: meraki.cisco.com/products/switches/accessories I'm trying to ...
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1answer
40 views

difference between LC/PC and LC/APC couplers?

i have to connect two LC/APC male connector plugs. Currently i only have blue LC-LC couplers on stock. Due to analogue RF-Overlay signals that are transmitted via this link, the quality of the ...
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1answer
53 views

How to use an optical tap? Which fiber should I use?

We have an optical tap (https://www.fs.com/products/73675.html) that provides an LC connector providing two TX instead of RX/TX. As you can see, there is a conflict. What I think I need: A splitter ...
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2answers
76 views

SFP modules and LC-to-LC patch panels?

Simply put, we are joining two sites that are 200m apart using 8 core OM4 Multimode fibre cable. Am I correct in understanding that lc patch panels on either end of the fibre cable are ok and that ...
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2answers
51 views

Internet Entry Point

I am learning netwroking and would like to ask about how exactly we (as a casual user) get connected to internet and how a datacenter would do the same thing. i bet they dont use a regular modem which ...
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2answers
137 views

Fiber to copper conversion, what are the odds?

My ISP says they bring optical fiber to their junction box outside and they bring the copper cable inside from the junction box. And they're promising a symmetrical bandwidth with a speed upto 50MBps. ...
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2answers
460 views

Appropriate certificate to ask for a fibre installation (ANSI/TIA-568.3-D?)

I am getting a subcontracting company to provide terminated fibre connections between two points, and I want to say what they are expected to do and what certificate they are expected to supply. This ...
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6answers
2k views

Do I need to protect SFP ports and optics from dust/contaminants? If so, how?

I have a used switch with some SFP ports and some SFP modules installed, which I don't use. All new switches come with little rubbery bungs that block up unused SFP ports, but since this old procurve ...
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2answers
38 views

Purpose of fibre optic splitters?

What is the purpose of a fibre optic splitter? One easily finds purely optical devices which split a given fibre like this: X | +-+++-+ | | | | A B C D number of outputs from 2 ...
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8answers
4k views

What do the positive and negative (+/-) transmit and receive pins mean on Ethernet cables?

So I'm trying to understand the pin layout of an Ethernet port, specifically for 8P8C which to my understanding is the most common. Of the eight pins, only four are apparently used for communication, ...
2
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1answer
48 views

One Fiber Optic Line 24 Cores for Multiple Services Transmission

Hello we have a construction project for building a compound of 50+ villas. The aim is build and connect the villas all together transmitting all services through the fiber optic. The services ...
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1answer
156 views

Confused about single strand Fiber media converter or duplex media converter?

As per Title you may understand my question. I have read many articles about WDM technology as well as Tx/Rx on separate optical fiber. Here my question is which is better in real environment? Any ...
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2answers
167 views

Noticeable limitations or penalties from using inline fiber couplers

Is there any noticeable limitations or penalties from using inline fiber couplers, such as those in a patch panel to join multiple fiber runs together? Currently I have switches joined together ...
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1answer
139 views

Is a fiber optic connection considered a “wired” connection?

https://en.wikipedia.org/wiki/IEEE_802.3 As Wikipedia says, 802.3 is for ..."wired Ethernet". How can I name copper and fiber networks in one word to describe 802.3 standard and to distinguish from ...
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2answers
133 views

Fiber Optic Question about Single Mode cable with SC connection on SFPs

I have two places to connect. Let's call it, place A and place B. On place A there is a Fortigate100D which has this kind of port; On place B there is a Cisco SF200-48 10/100 Smart Switch; I have ...
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2answers
35 views

Optical fibers out of service

We just got multiple new optical fibers out of service on our infrastructure, does a bad equipment or a too high signal could break an optical fiber silica or could cause any others issues ?
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2answers
95 views

Can large ISPs really offer 1Gb “dedicated” service to every home and business?

Hopefully this is on topic for this site. While researching synchronous carrier service, so called EDIA or Ethernet Dedicated Internet Access, to a rural location in New Hampshire, USA, I came across ...
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1answer
39 views

ISP Failover On A Converged Network

We have our fiber providor as our primary ISP. We have comcast as our secondary ISP and our Voip providor. We can setup the failover between the two ISPs. We also have 19 voip phones that are on a ...
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1answer
165 views

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

We have single mode OFC network and CAT 6 CAT5 LAN with ethernet and gigabit Ethernet switches and ordered for "GE SFP, LC CONNECTOR LX/LH TRANSCEIVER FOR SINGLE MODE FIBER OF CISCO CATALYST 2960 S" ...
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2answers
74 views

Sharing GPON infrastructure between multiple service providers

Real life problem. A city's planning to install a GPON FTTH network. The city's only proposing to install the fiber, so the OLTs and ONTs will be owned by the service provider. The city would also ...
6
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1answer
417 views

Why is there a separate set of 10 Gigabit fiber-optic transmission standards for WANs/SONET?

So, I'm reviewing the different IEEE transmission standards for an exam, and I've noticed that for the 10GBASE-X standards, there's two different sets of fiber-optic standards, 10GBASE-xW and 10GBASE-...
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3answers
303 views

Will this SFP Transceiver run over OM1?

I'm fairly new to fiber cabling. I have an OM1 cable (running 750 metres) already installed on a site that currently works fine on an old system that is being upgraded. I'm trying to find out if these ...
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4answers
371 views

Will Mode Conditioning Patch Cables help with this issue?

I have been having problems with a link flapping only when working with the AXM763 Module, but when I change 1G module it works without problems. Also there other 2 links with the same configuration ...
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3answers
1k views

Can Ethernet use fiber optic cables?

I am new to networking, know about Ethernet and that Ethernet cables exist to make a wired networks. I also know about fiber optic cables which have a glass like material inside and transmit light ...
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2answers
63 views

What type of connector is this [closed]

I visit a flat and found this type of connector, the place, in theory, is capable of having fiber optic up to 1GB, I was expecting an OTN socket something like this: Instead, I found this:
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1answer
749 views

What is the maximum distance that a cable/fiber optic internet connection can operate without the internet quality degrading? [closed]

I hope that this is not an ignorant or misinformed question, I am new and I'm trying to learn more about internet provision. I have read that DSL has a maximum distance of 18,000ft (or 5.5 Km) before ...
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2answers
783 views

HP ProCurve 2524 - CLI Command to find Fiber Transceiver's Serial Number

Is there any cli command allowing to check the serial numbers of the inserted mini-GBIC modules on a HP J4813A ProCurve Switch 2524? The show interfaces transceiver [PORT-NUMBER] command which works ...
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1answer
223 views

Fiber signal loss - works on Cisco 4510 but not Catalyst 9300? [closed]

We are performing major switch upgrades and moving from a collapsed core design to a proper Core, Distribution, Access design. We have a very odd problem where our fiber connections going from the ...
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2answers
237 views

Fibre connection working in TX mode only?

I have this wierd problem: I need to connect two sites linked with a 4-couple multimode cable. At both end I installed HP Aruba 2530-8 switches with J4858D GBIC adapters. The situation I'm now ...
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1answer
66 views

How southern cross cable can transmit IP/ Ethernet signals keeping in mind the physical limitation of Ethernet cables?

The Optical fibre can transmit/receive any ethernet frames or packets faithfully for 5kms. However, the cables laid in the southern cross i.e. under the sea beds must be several miles long. The ...
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1answer
107 views

Can an Ethernet port with an SFP handle a PPP/fiber line?

AT&T put in a 150 Mbps fiber line at our business (not my home). They claim it uses the PPP protocol (I am told this is non-Ethernet), but is terminated in multi-mode fiber using 1000BASE SX (an ...
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1answer
58 views

Fiber optic cable juniper ex4500

Noob 10G question. I have a juniper ex4500 10G switch and Qlogic 3242 10G card. I use twinax cables for servers within the rack and they work just fine. But, now we added a new office which has 2 ...
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1answer
429 views

SC to LC converter - performance penalty?

I'm maintaining a cross connect and using a SC to LC adapter to patch the LC into my equipment. Was wondering if anyone has a clue on what's the penalty of using the converter in oppose to installing ...
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2answers
65 views

Transceiver for MM links up to 2k

I have 2 links of 1.5 mm f.o mm c / u I want to know if a transceiver GLC-GE-100FX would work for me, why and what are its variations.
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2answers
187 views

Do low temperatures cause problems installing new optical wiring or fixing broken optical cables by splicing?

One of our supplier reported big problems splicing (using this) a broken outdoor optical fiber cable when temperatures around or little bellow freezing point. They refuse to install new optical fiber ...
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2answers
396 views

Moving an Alcatel I-211M-L using Fiberoptic connection

I have an Alcatal I-211M-L that I'd like to move. Is it possible to buy fiberoptic couplers and cables to extend the range of the fiberoptic cable, or do I need to call Verizon to have them move it? ...
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3answers
241 views

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

I just bought a SFP Transceiver (on Amazon) to connect an optical fiber between 2 CISCO switches (2960x). The SFP is detected as "Type : unknow". Do you know if I inevitably must buy a CISCO SFP ...
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2answers
61 views

Better throughput with 100 Mb NIC setting

Ran across something very odd today. Just had a symmetrical 100 Mb circuit installed at a site I’m contracting at. When the NIC is set for auto negotiate for duplex and speed, we only get ~96 Mb down ...
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2answers
555 views

25G SFP28 NIC and 25G SFP Adapter

My company recently purchased some Dell R740's with 2 Dual Port 25G SFP28 NIC's (Broadcom 57414) and wants to hook them up to an Arista 25G switch. We have two types of SFP adapters from Arista: SFP-...
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2answers
171 views

Acceptable Light Loss for SMF

I'm having some trouble finding a definite answer. I use a light loss tester to test our fiber (we dont have an otdr) and am unsure as to the acceptable light loss for 1310 SMF. So far I've figured ...
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4answers
2k views

1000BASE-LX/LH Receive power level greater than transmit power level

I have a pair of GLC-LH-SMD devices which are 1000BASE-LX/LH In the field they will be a couple of kilometers apart , but whilst I test the setup I only have 5m patch leads. I looked at the specs ...
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2answers
102 views

Cable for 4Gb Fibre Channel

I have two servers with 4Gb Fibre Channel HBA adapters. Looking for cable for them, I found reasonably priced cables that say they're 10Gb. I know that if this was copper, it would be overkill, but I ...
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2answers
52 views

How is wavelength assignment in Wavelength Division Muxing Rings determined? [closed]

I have this image that supposedly documents how to handle a 3-node wavelength division muxing ring: I know an n-node ring will need wavelengths (n * (n-1) / 2). But I have no idea how which ...