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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921 views

Why is laser light used in single-mode step index optical fiber?

Why lasers for single mode? It’s not about the brightness, for you can get some seriously powerful LEDs. And it’s not about the size of the core, we have lenses for that. So Why is laser light used in ...
4
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1answer
5k views

Why does my Cisco 4507 core switch not recognize my SFP+?

I have a SFP+ cable of dubious parentage (I think it is a knockoff) that I'm trying to use to connect a Cisco 2960S stack with a 4507 core chassis. I have included what I think is relevant ...
4
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3answers
2k views

Layer 2 switch send VLAN frames over fiber connection to another Layer 2 switch?

We have 2 network rooms in our building and each are connected via a fiber link. One room is very tiny and is where our Comcast Internet comes into the building. I want to place our Cisco ISA570 into ...
4
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1answer
3k views

Router not assigning DHCP IP Addresses to Interconnecting Switches

I am having problems connecting from some of my switches to the router/internet. I have a Cisco 1900 series router with four different 2960 series switches. All Gigabit Ethernet ports are configured ...
3
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2answers
269 views

How fast can information travel through various media?

I'm working on compiling some information about network latency and designing tests to help our support folks troubleshoot problems. In order to do this, I need some basic information that I don't ...
3
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2answers
11k views

multi-mode transceivers on single-mode fiber

The topic says it all; is there any hope for using multi-mode transceivers on a single-mode fiber cable? I work exclusively with mobile setups, where I use pretty expensive fiber cables. The ...
3
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2answers
340 views

SFP to SFP going through multiple environments – segmented or via single cable?

Design consideration – should I use a single fiber between two server rooms or split it into segments for easier maintenance/diagnostics/replacement? But splitting the fiber into multiple segments ...
3
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4answers
570 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 ...
3
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3answers
6k 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 ...
3
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4answers
8k views

Difference between LR and ZR 10Gb Optics

What is the difference between a 10Gb LR optic that can only go 10km compared to a ZR optic that can go a lot further at 70km?
3
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1answer
673 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 ...
3
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4answers
8k views

Can one fiber be used to transmit and receive signals? [duplicate]

Like I specify in the title, I want to know that one fiber can be used to transmit and receive signals. Whether it can or not, why?
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2answers
1k views

Why use T1, T3, OC3 in 2015? Why not just pull fiber?

I am currently looking to upgrade internet connections in our major offices. Given that our reliance on cloud services has grown, some users are complaining of sluggishly behavior. After testing, as ...
3
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3answers
1k 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 ...
3
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4answers
4k 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 ...
3
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1answer
204 views

Cisco Fiber switch perform at 100/1000

One of my switches is being replaced. It is a 24 port 100 base MTRJ Cisco switch. It is being replaced with a WS-C3750X-24S-E. Will this switch support 100/1000 or 1000 base only? I have some ...
3
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2answers
236 views

No Access to DHCP Server

Here's the scenario: I replaced 2 core switches (3550 catalysts - 12G) on Wednesday. I have configured the VTP and added the VLANs to the database. My core and ethernet switches can ping to the ...
3
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4answers
4k views

What is the maximum distance for blowing optical cable through pipes?

What is the maximum distance for blowing optical fiber cable with compressed air through pipes? The method known also as Cable jetting. Taking into consideration no lubricant is used. I am asking ...
3
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1answer
49 views

Fiber Trenching Design (L1)

We are in the process of building a new campus which will be 10 single-story buildings on 20 acres. The buildings are laid out in a U shape. The bottom of the U will host all IT services (servers, DC, ...
3
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1answer
232 views

OM3 optical fiber 850 nm compatibility with 10GBASE-LRM

I have Cisco equipement with "XENPAK-10GB-LRM" and Optical Fiber Type OM3 wavelength 850 nm. As the LRM interface works at 1310 nm, will it work with this type of Fiber.
3
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2answers
4k views

What is the maximum segment length of fiber-optic cable for both single-node and multi-node?

What is the maximum segment length of fiber-optic cable for both single-node and multi-node? I can't seem to find a straight answer for this. Does anyone know the answer to this or know of somewhere ...
3
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2answers
253 views

What are the implications of 'saturating' a broadband connection?

We recently switched from a business-class cable connection (100/20) to a symmetrical (100/100) fiber one. This serves a front office, a media department, and several client computers on any given day....
3
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2answers
232 views

When is the connector's damage a good reason for a new pigtail welding?

I have recently seen a few pictures of optical fibre connectors taken by a microscope after those connectors had been cleaned. The picture states, that the connector fails IEC 61300-3-35 norm. Like ...
3
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1answer
2k views

How many E1 tributaries can be carried in one STM-4?

This is how I did it Bit rate of E1 is 2.048 Mbps and bit rate of STM-4 is 622.08 Mbs I divided the bit rate of STM-4 by the bit rate of E1 and got the answer as 303. Is this correct? Or do I have ...
3
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1answer
49 views

Should Bit Errors Cause Loss Proportional To PDU Size?

Should I expect random (or even regularly-occurring) bit errors to cause corrupted/dropped PDUs (packets) proportionate to the PDU size ? Troubleshooting high (0.01% to 0.1%) packet loss over a short (...
3
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2answers
4k views

sh int transceiver Explanations

When looking at the output of show interfaces transceiver on a Cat 4500X you notice that there is a Tx and a Rx power measurement. My questions about this output are: Why is each transceiver ...
3
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2answers
259 views

How do broadband optical transmitters work?

So I'm a hardware engineer learning about networks, and one interesting subject that my book glassed over was how hybrid fiber-coax networks work. One thing that was throwing me off was that the ...
2
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4answers
1k views

The Basics of Fiber Optics

I'm wanting to look into designing and implementing a fiber optic network. But I've never done anything with it before, I've never even seen any fiber network actually working either. I've designed ...
2
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4answers
8k views

What does "10Gbps wave connection" mean?

When I work with multiple ISPs, they refer a connection type as a "10 Gbps wave connection". What does it really mean? I can understand 10 Gbps fiber but what does "wave" meas?
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3answers
6k views

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

I have this multimode transceiver product: http://www8.hp.com/h20195/v2/gethtml.aspx?docname=c04168409&search=J4858C I am going to use it on the following switch: http://www8.hp.com/h20195/v2/...
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3answers
2k views

using fiberoptic for long-distance ethernet connection [closed]

I am trying to help provide decent (better than ATT's awful 3Mbps-on-a-good-day DSL) internet service to a cluster of homes in our rural neighborhood. The first house (near the main road) has good ...
2
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2answers
2k 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. ...
2
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3answers
369 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 ...
2
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2answers
759 views

Reasons not to combine daisy chaining with path redundancy

Is there any specific (maybe obvious) reason why path redundancy and daisy chaining is not combined? Cisco does show some network topologies HERE, but the combination of path redundancy and daisy ...
2
votes
1answer
474 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 ...
2
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2answers
317 views

Fiber link loss on Cisco Catalyst 3750x series switch

I have cisco catalyst 3750x 24 port switch series switch, and the switch has C3KX-NM-10G module. Problem : I have connected fibre optic in SFP+ transceiver on G2/TE1 (Uplink).  After 7 to 8 hours, the ...
2
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3answers
954 views

Single-mode cable to multi-mode interface

I have a 1500' fiber run to make for data 10/100. The interface on each end is multi-mode, but the cable I have is single mode. Can this be done? I'm new to fiber so be gentle with me.
2
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2answers
223 views

SFP+ 10GBASE-LR and attenuator

This picture is a part of the Intel E10GSFPLR (SFP+, Long Reach) datasheet. Can I use them in a short link (less than 1 meter) without any attenuator? Which numbers are important in this datasheet to ...
2
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1answer
627 views

10G SFP+ transceiver with OM4 fiber cable - Maximum cable length?

I can't find 10Gb SFP+ transceivers supporting cable length over 300mt (we need 400/500mt) is there a standard/physical limit on this, or such transceivers, with extended length support, do exist? We'...
2
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3answers
208 views

How data is routed from one landing point to another on submarine cables?

On submarine optical cables with one trunk and several landing points, how does data that leaves one landing point be routed to a desired destination at another landing point? I have many hypotheses: -...
2
votes
1answer
603 views

Layer 1 problem - fiber ethernet won't connect unless held in

I'm attempting to uplink an older D-Link DGS-1224 switch to an HP Procurve 2810 using a 50 meter MM OM3 fiber cable on the bench before running the cable in the plenum for production. Cable is high ...
2
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2answers
201 views

SFP GBIC and OS rating

I am confused about SFP transceiver choice, and compatibility with single mode fiber based on the fiber's OS rating. My only question is, when choosing an SFP is it necessary to consider the OS ...
2
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1answer
73 views

Different Media Converters at both ends for Modbus Communication [closed]

I am trying to establish Modbus TCP/IP communication. Modbus Master and slave are around 500 mtr away from each other. We are using FO to Copper converter at both ends. Modbus slave end is having ...
2
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2answers
126 views

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? On the other end there's a switch with 10G SFP+ ...
2
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3answers
4k 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 ...
2
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1answer
529 views

What will be the compatibility/communication issues of using media converter at one end and fiber switch at the other end.?

Can anyone please explain me what will be the compatibility/communication issues of using media converter at one end and fiber switch at the other end.? if no, then will different brand of fiber ...
2
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3answers
89 views

impacts of Fiber on a LAN with external copper connection

Would there be any noticeable difference (or any) if one was to use fiber cables for their LAN even if there was a standard copper connection coming into the network?
2
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2answers
188 views

Fiber Optic Multimode principle

I'm trying to figure out how the multimode fibre optic really work, I looked in many sites but didn't really found an answer to my question; let's take an example this picture: in the multimode, are ...
2
votes
3answers
989 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 ...
2
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1answer
77 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 ...