Fiber Question!

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BS911

Senior member
Oct 10, 1999
479
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I'm working with a company that is looking to get a couple of gigabit connections back to their NAS for systems that are doing 3d modeling / CAD type applications with big file sizes.

One of the connections is a no brainer, just typical Cat5E wiring back to the switch closet where I will put a gigabit switch. The other connection I am not so sure about though. They have a fiber connection running out to their production floor to another rack where it terminates into fiber uplink ports on a switch. Is it safe to assume that this is probably only a 100MB connection limited by the speed of the ports on the switch? I'm not really familiar with fiber connections so I'm just guessing. If i need to get gigabit out to the production floor I assume I'll need switches with 1000MB Fiber uplinks?

Thanks very much for your help and suggestions!

-BS911
 
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spidey07

No Lifer
Aug 4, 2000
65,469
5
76
most likely you have multimode fiber. you can read the outside jacket to really see what it is. 50 or 62.5 micron multimode fiber.

If its orange - its multimode. If its yellow, it single mode.

You can't really assume what is running on it unless you look at the ports on the switch that are using it.
 
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BS911

Senior member
Oct 10, 1999
479
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0
It's orange cabling so must be multimode.

The switch is probably 4-5 years old but I guess that probably doesn't mean much as far as the fiber connection speed goes?
 
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spidey07

No Lifer
Aug 4, 2000
65,469
5
76
Originally posted by: BS911
It's orange cabling so must be multimode.

The switch is probably 4-5 years old but I guess that probably doesn't mean much as far as the fiber connection speed goes?
Click to expand...

could be 100 meg, could be 1000 meg. The ports on the switch/model number should tell you.
 
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Goosemaster

Lifer
Apr 10, 2001
48,775
3
81
Keep in minf that I am not 100% sure of this, but here i go:

depends....since you mentioned NAS. Fiber arrays run @ 1or 2Gbps. If it is a 802.3 100baseFX or 1000baseFX network, it is different, as it will run@ 100Mbps or 1000Mbps.

Keep in mind that 8bits=1Byte and 1000Mbits= 1000/8 = 125MBps or MEGABYTES/second.

1) Since it seems to be for clients and not arrays, it is prolly safe to assume that it is either 100Mbps or 1000Mbps.

2) The fiber is indeed limited by the ports on the switch because it is being signaled at a certain defined speed. For example, in a sonet ring, you can get many different speeds such as an OC12(655Mbps) or and OC768 (40 Gbit/s)(ok maybe not yet)

With FIber, you have usch a fast medium that it usally depends on

a)the type of fiber(mutimode or not)
b)type of signalling ..how fast your adapaters are.

Sort of how you can use cat5e in 10bast T to gigabgit..the medium is not the limiter in this case.
 
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