Blue and Grey Lan cable issue

April 24, 2012 at 01:25:16
Specs: Windows 7
Hi All,
I have two type of LAN cable one is Blue in color and another one is in Grey. We have HP H3C switch at one end and Juniper switch at other end. The problem is when I connect Grey cable than physical connectivity is done and switch starts pinging. But when I connect Blue cable then there is no connectivity shows. Both cables are good in condiction ( Tested with LAN Cable tester) but don't know why it is.

Can anybody help me in this.

Gaurav Asthana

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April 24, 2012 at 03:35:06
There are two types of CAT cable in the way the wires are connected to the end-connectors relative to each other.

One cable is the "straight-through" type and the other is the "crossover" type. That's why they are a different colour.

You evidently have one of each type. Buy another cable same type as the one which works on your setup, or if you need to use both cables at same time, try swapping them over.

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April 24, 2012 at 03:47:05
IF it is likePhil22 said, In simple words it could be one PC to PC cable and Other PC to Router cable. ( They have different internal connection from one end to another). And another thing possible is you can cut your cable and make it whatever way you want.

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April 24, 2012 at 06:59:07
Color is not relative to whether a cable is "straight through" or a "crossover". How the wires are oriented inside the RJ45 ends is what counts.

Check the links SAIF posted and compare your cables. If both ends are A or B, then it's a straight through (patch) cable. If one end is A and the other B, then it's a crossover.

Crossover cables are necessary only when connecting like devices (ie: computer to computer or switch to switch)

It matters not how straight the gate,
How charged with punishments the scroll,
I am the master of my fate;
I am the captain of my soul.

***William Henley***

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Related Solutions

April 24, 2012 at 13:38:56
The connections on cables can become tarnished over time. Take a cotton swab and some alcohol and clean the contacts on the cable.

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