atcomsystems.ca/forum Forums Wiring - Telecom Carriers - Trunks & Services Outside Plant OSP Construction Dropped Drops.

That sounds like my experience with Commscope's CAT3 4 pair cable.

Old Systimax 4 pair CAT3 had traditional insulation.

Today, Commscope's CAT3 4 pair is CAT5 that didn't meet specs. Commscope labels and sells the cable as CAT3. The insulation is translucent and can be difficult to, correctly, identify the pairs.

Dean, someone gave me a box of cat5 with that translucent teflon insulation. I used it to wire a friends house for ethernet and phones. It was indeed a pain in the butt, but it worked and it was free.

Paul, I've seen a bunch of OSP in my travels and it all has been solid colors with no tracers. I have a large chunk of something like 300 pair that someone gave me and while I have the binders separated and the pairs grouped at one end, it still gives me a headache to look at it. It's not long enough to do anything with so I keep it just to show off to people.

The real fun stuff is the lead pulp cable. I have a short chunk of that and the paper is white and pink (probably was supposed to be red) and that's all you have. I think I posted a picture of it once. I found it in the basement of the bar I do maintenance for. The building was originally fed with pulp cable but has long since been redone with regular plastic stuff and a fancy 100pr protector/terminal. I'd love to cut out one of the lead splice cases and open it up to get some pictures. There's three or four lead splices down there where they tapped off the main cable to feed terminals.

Osp cables usually arent striped. They are twisted together though so it's usually no doubt what the pair is.

Twisting aside, is there a reason why striping isn't found on OSP cables? Split pairs was one of the major reasons for trouble tickets being opened with Verizon over my 23 years as a CLEC/IXC Central Office technician.

Price is at a premium per foot. Any extra step in the manufacturing process is big money when they are placing 5000 ft of 1200 pair cable. I've only seen split pairs on drops and once out of a x connect box. Both cases are guys trying to avoid fixing a resistance fault. It's really never been a problem splicing for me. It's always the repair guys.

Also I think we got two cos around here that's got a couple hundred feet of split pairs because everything has bad lb and minor noise despite having good resistance and voltage.

They used to have only yellow/black plastic cable too. Paper isnt uusually a problem losing pairs, it's much worse about unravelling the paper. Some of these splices you almost cant touch without tuning them.

The reason for non-band marked cable pairs has to do with a few things. First, polyethylene insulation really can't have another color applied to it. It won't stick. Second, the reason they use polyethylene insulation is that it can be much thinner than traditional PVC, which helps to reduce the overall diameter of the cable. By this same logic, believe it or not, the thickness of the colored stripes or bands will actually increase the diameter of the cable as well when you're talking about hundreds of pairs. It's all about keeping the cable as small as possible to reduce weight, labor costs and most importantly, maintaining a maximum outside diameter of 3.75" so that it can be pulled into 4" ducts.

Kinda makes me glad that I didn't have to work on OSP copper.