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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9
votes
4answers
736 views

FTTH and alternatives

I was listening to a interview regarding the back country and Fiber to the home with the Swedish professor in telecommunications Per Ödling. Once in the interview he was referring to technologies that ...
16
votes
3answers
6k views

DWDM active and passive comparison

I am trying to understand the cross-over point for when I would deploy active DWDM over passive DWDM (as active seems to be more expensive based on my initial research); Passive DWDM takes in various ...
20
votes
5answers
40k views

Where to cross RX/TX line in fibre optical cabling

I'm in the process of connecting together some sites via optical fibre. The trans-site multimode fibres are terminated with SC jacks on patch panels from where they are patched to the corresponding ...
5
votes
1answer
889 views

Fiber Port Issue

I'm trying to troubleshoot a situation between a foundry sx and a brocade icx. I setup tagged ports and vlans between them both. Now when I connect the 2 switches with an ethernet cable, ospf comes ...
4
votes
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
votes
2answers
209 views

Small datacenter fiber management [closed]

I'm in the process of building out a small datacenter ( about 10 racks ) and it feels like the fiber connections for storage and 10G ethernet are really piling up. Does anyone have any products they'...
12
votes
5answers
2k views

Do faster segments of a network mean faster flow rate or lower latency?

This is another one of those hypothetical questions. I've been trying to figure out whether or not having a faster 'segment' of a network in between host A and host B will translate into a faster flow ...
3
votes
2answers
267 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 ...
8
votes
3answers
976 views

10GigE fiber over a distance of 120km?

If we purchase a single strand of dark fiber which spans 120km, is it possible to light it at 10Gig? We will be using a 6509 switch at one end and a 4948-10GigE at the other end. We have not ...
3
votes
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?
4
votes
2answers
202 views

Connecting 2 FCoE Switches together with optical cable

I'm designing a network and have 2 cabinets on each floor, and I'm thinking of using FCoE switches in both cabinets so that I can connect them with fibreoptic cable. I think I can easily find switches ...
1
vote
5answers
214 views

Is it common for rackmountable servers to have fibroptic input and output? or is it cat 5 and you have to convert after?

If the switching hub is in the floor above the server, I've heard its best to use fibre-optic cabling to avoid interference from unrelated electrical cabling in the ceiling for lights etc... Is it ...
6
votes
3answers
4k views

What is a reasonable latency for a L2 1G leased line between 2 sites, about 420km apart?

We need a dual gigabit connection to one of our customers and for the time being one of the lines has been brought online. The connection is between our DC and the customer's HQ, it's a L2 connection. ...
7
votes
4answers
1k views

Why has a fiber optic cable stopped functioning on one of the allowable wavelength? [closed]

For a long time, a fiber cable worked on both allowable wavelengths, and now it does not. Is this a defect of manufacturing? Maybe it's due to weather, other external factors, mechanical damage, or ...
56
votes
14answers
195k views

Multi-Mode and Single-Mode Fiber Differences

When cabling a network using fibre, what is the difference between single-mode and multi-mode fibre? When should I be using one or the other? Are there compatibility and/or speed concerns with either?
7
votes
3answers
6k views

Raman amplifier vs EDFA, what is the tradeoff?

For light amplification for longer-haul fiber lines, as far as I can tell, the two major options are EDFA's and Raman amplifiers. What is the tradeoff between one type and the other? Are there areas ...
85
votes
21answers
77k views

When to choose fiber instead of twisted pair (copper)

These days both fibre and twisted pair are supporting 1000BASE-T and 10GBASE-T, but when do you choose one over the other? The obvious one is maximum cable length, but what are other factors which ...
9
votes
3answers
1k views

What type of fiber do I need for a WS-G5484

I have bought two WS-2948G switches from cisco for a lab. I now need to buy two additional modules for them WS-G5484. I've never worked with fiber so I was wondering if there are differences in fiber ...

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