3550-emi 12g cable requirements

[kimlong]

We just purchased the 3550-emi 12g (Cisco Catalyst 3550-12G Switch— 10 GBIC-based Gigabit Ethernet ports and 2 10/100/1000BaseT ports). We

want to connect 2 of these devices via the 1000Base T ports. I checked

the cable requirements and I just want to be sure that we can do that

using a standard cat5 crossover cable. If not, could you supply a url

for the cable requirements and wiring diagram.

Thanks.

[siljugpillai]

You will have to cross the other pairs too. Normal croos will not work.

1-3

2-6

3-1

4-7

5-8

6-2

7-4

8-5

Check the following link...

http://www.wiring.com/industry_diy/pin-outs.htm

regards

[kimlong]

Thanks for your help.

[sbrobak]

This is not correct. You can use x-over cables where only 1,2,3,6 us used. We're using it and it is according to doc. on cco. If there is other recommondations, please inform me.

[siljugpillai]

Check the following link. Cisco too recommends four twisted-pair, crossover Category 5 cabling for 1000BaseT ports. Are you sure you are getting a speed of 1000Mbps?

http://cisco.com/en/US/products/hw/modules/ps872/prod_release_note09186a00800e38ac.html#xtocid1019419

regards

[sbrobak]

Yes, the links is 1000Mbps/full. See:

http://www.cisco.com/en/US/partner/products/hw/switches/ps646/products_installation_guide_chapter09186a008007d160.html

but I agree that four twisted-pair should be used. Could be working in our case since the switches is locaded next to each other.

[siljugpillai]

Thanks for the information. I thought the normal cross over doesn't work. Sorry for the confusion.

regards

[sbrobak]

I'm also very sorry for the confusion. When you posted your info. about using 4 pair I had to check my cables and I'm using all 4 pairs. I tested with using only 2 pair and IT IS NOT WORKING either for 10, 100 or 1000. You are correct.