This chapter weighs the pros and cons of Method C of the TIA-568 cabling standard.
Would you like to learn more? Download our white paper on this topic here.
- Chapter 1 - Introduction to challenges for polarity in data centers
- Chapter 2 - Understanding MPO polarity
- Chapter 3 - Knowing the standards
- Chapter 4 - Optics from 10G to 400G
- Chapter 5 - Disadvantages of Method A TIA-568
- Chapter 6 - Analyzing Method B TIA-568
- Chapter 7 - Analyzing Method C TIA-568
- Chapter 8 - Introducing the multi-path solution
- Chapter 9 - Real-world examples of how multi-path works
- Chapter 10 - The advantages of a multi-path solution
Rick: And then finally, Method C, okay. Again, a good method for ... It has its advantages for some things and disadvantages for another.
It's our opinion that Method C and duplex connectivity is by far the best method. It uses one jumper, one trunk, one style cassette. It doesn't matter how many interconnects you have, you're at the right spot every single time. Great system for duplex connectivity.
However, when you switch over to parallel optics, not so much. Not saying it can't be utilized, however, there's costs involved, similar to that of Method B for switching out product and things of this sort.
What you have to do is, obviously, if you think about the path, if you take a look at what's happening and going on here, this system uses a ... utilizes a pairwise flip slip all the way through the system. So fiber one through the whole system, goes to fiber two. Parallel optics, we need fibers, the first four, to go to the last four. So in this, we would have to implement, for example, a cassette system. So, on one side, that basically straightens the trunk out, so to speak, or it straightens the pairs out and then actually flips it. So then you're talking back to two different style cassette modules on each side.
Rick: Okay. So, that's inherently what the challenges are for Method C. So, again, each of these systems, they have their own unique set of advantages. But, nothing holistic, as far as works in every type of scenario, cost-effective.
Rick: And that's what we're looking for, okay? So that's what the challenge is. Also, inventory management. A lot of people set out with good goals, just like when you first implement infrastructure, if it's not designed properly ... Everything looks good when you first plug it in if you do a good job. Okay?
Rick: But, how many data centers have you been through, JT?
Josh: A good handful.
Rick: Are they all pristine?
Josh: Nope. No.
Rick: Unfortunately it's more of the norm than the standard, right?
Rick: So, this is the case. You might set out and it's like, "Yeah, I'm going two different style inventory cassette modules, A sides and B sides, or core and edge, two styles of jumper cables." It simply doesn't work out that way. You're going to have a guy, if you hire three years from now, he's going to come in. He's going to plug something in, it's not going to work. Things are going to go down. You're going to call, yell at vendors. Vendors are going to say, "Well, what are you doing?" It's just a tornado effect all the way through. Again, not a plug and play system. It implements down time and nobody wants that. We certainly don't want any kind of ripping and replacing, okay? Again, if I'm spending big dollars and big investment to put in an infrastructure, I want it to last several years.
Rick: Okay? So.