probably asked a million times but 2 questions regarding UTP Cabling

1. Does anyone have a good mnemonic for remembering the order (or is it just practice)
2. do you need to know 568A and 568B for ccent or just 568B?

Find more posts tagged with

Free for TechExams community: Cybersecurity salary guide

Compare cert salaries and plan your next career move

Button

Comments

NetworkVeteran

gbdavidx wrote: »

1. Does anyone have a good mnemonic for remembering the order (or is it just practice)
2. do you need to know 568A and 568B for ccent or just 568B?

I think a better question is should you spend much time on this?

This goes into my "useless trivia" pile. I see little real-world value in remembering the precise pin-out besides being able to visually distinguish between cables types--e.g., straight-through, crossover, or rolled. Even the utility of that is decreasing. You could add this to your "5-minutes before the exam" cramsheet so you know it long enough to get that question right.

theodoxa

gbdavidx wrote: »

1. Does anyone have a good mnemonic for remembering the order (or is it just practice)
2. do you need to know 568A and 568B for ccent or just 568B?

Don't Have a Mnemonic [personally,] but I just remember 568B and then flip the orange and green pairs to make 568A. The Blue and Brown pairs are the same for both A and B.

568A: GrW, Gr, OrW, Bl, BlW, Or, BrW, Br
568B: OrW, Or, GrW, Bl, BlW, Gr, BrW, Br

volume

Mostly, it's just practice. "Luckily", early in my career I made patch cables until my fingers bled. To re-create the pattern for 568B,

- Alternate stripes and solids - solids and stripes are never next to each other
- Start with a striped one
- The center pins were originally unused so they didn't get confused for phone wiring, and they're blue like the AT&T logo
- Orange on the left like, the traffic cone on the left side of your truck
- Brown on the right, like your coffee in the cupholder
- Green surrounding the "phone" pair.

Then to convert to 568A, remember that a crossover cable is just a cable with 568A on one side and 568B on the other, and that the Orange and Green pairs are the ones that get swapped.

theodoxa

NetworkVeteran wrote: »

I think a better question is should you spend much time on this?

This goes into my "useless trivia" pile. I see little real-world value in remembering the precise pin-out besides being able to visually distinguish between cables types--e.g., straight-through, crossover, or rolled. Even the utility of that is decreasing. You could add this to your "5-minutes before the exam" cramsheet so you know it long enough to get that question right.

I remember back when I first studied Cisco (2001), there was ALOT of Cabling and Design in the Network Academy Curriculum. Literally a good chunk of Semesters 1 and 2 if I remember correctly was how to make UTP cables, Patch Panels, where to locate the MDF/IDFs, What a POP/Demarc is, etc...along with networking basics (OSI Model, etc...) Now, it seems that most of this has disappeared from the CCNA. They still require a cabling course (UTP, RG6, 66-Block, 110-Block, 25-Pair Splicing, and Basic Fiber Optics) at my local Community College as part of their AS degree, but from what I've seen in the books and videos, the only wiring/design left on the CCNA is 568A/B and when to use a crossover vs. straight-thru.