Fibre cable/type suitable for 1000-Base-SX GBICs?

[omegaamigo]

I have two Cisco 4006 switches and each has a 1000-Base-SX GBIC with an SC connector. I am trying to trunk between these two using the GBICs.

If I use a SC-to-SC fibre patch lead and connect the switches directly together, I can trunk fine, so the switches are obviously behaving OK.

However, the two switches are to be located in two rooms which are about 150m apart and are linked by a run of OM2 62.5/125 multi-mode fibre (presented with ST connectors).

As I understand it (although I may be wrong), the 1000-Base-SX GBICs should work with this fibre, which I am connecting to the GBICs using SC-to-ST 62.5/125 patch leads.

Can anyone shed any light on this, please?

 

[robertjo24]

You should have no issues over that fiber.

 

[stupman]

I agree

 

[JAPeed]

{I found this info in our switch's install booklet}
GBIC Port Cabeling Specs
GBIC WaveLen Fiber CoreSz ModalBandwidth Cable Dist.
SX 850nm MMF 62.5um 160 MHz/km 722ft (220m)
200 902ft (275m)
50 400 1640ft(500m)
50 500 1804ft(550m)

The minimum cable length for all GBICs listed (MMF & SMF)
is 6.5FT (2m).

[source: Catalyst 2948G and 2980G Switch Installation Guide,
March 2000, Cisco Systems, pg 4-3]
# looks like your req. is well within the spec...

 

[rotaman]

I have a question concerning interconnecting some 3COM products.

I need to interconnect these three products with fiber (GBICS/ SFPs)

3C17706-US: 12 autosensing 10/100/1000 ports;
6 fixed 1000BASE-SX ports
6 GBIC ports accommodating
1000BASE-SX, 1000BASE-LX, or
1000BASE-LH70 GBICs
1 expansion slot

3CR17402-91 48 autosensing
10BASE-T/100BASE-TX/1000BASE-T ports
(four of which are dual-purposed with the
SFP slots);
4 SFP slots accommodating
1000BASE-SX, 1000BASE-LX and
1000BASE-LH SPFs (SFPs sold
separately); console port

3C17206 24 10BASE-T/100BASE-TX configured as
automatic MDIX;
2 module slots accommodating media
modules or stacking modules;
expandable to 192 ports

Questions:
1. How do i do it? I know the 3C17206 does not have fiber possibilities, but what about connecting the
3CR17402-91 and the 3C17706-US?

2. If connecting through fiber is not possible, what would be the downside (if any) of connecting through the 1000BASE-T ethernet ports?

Thanks for any help you can give!

 

[omegaamigo]

Yes, as everyone stated, there should be no problems on that fibre. However, it turns out that the fibre run is dead, so ...

Thanks.

 

[lambent]

try swapping the RX/TX fiber on the SC end.

Also make sure the patch panel really work by using...a torch.

 

[omegaamigo]

Yeah, it's been tested by the original installer and deemed 'dead'. They are going to fix and/or re-lay it ... cheers.