Toshiba Phone System

does anyone know any basic information on the local line plant of a telephone system?

i'v been searching the web n ebooks and they hav no info...help! i mean like do u knw any technical report on it or the construction

Public Comments

1. What about it? Do you want to learn how it's done, or how to blow it up? The actual distribution is pretty basic, you run a cable from the central office to various points around your cable plant. If you live in or near a small town, it's pretty easy to both find and see a CDO...that's where the aerial cable comes into the building. While you're looking up, notice the black boxes on the strands. Those are splice points. Underground is similar, it's just done in manholes.
2. Yes I do. But your question is way to general.
3. found this pretty easily, doing a search for telephone company outside plant... http://www.inetdaemon.com/tutorials/telecom/pstn/outside_plant/index.shtml basically for copper cable/pairs large cables are run underground from the central office to a main terminal (called an underground or F1 terminal) these are either pedestal boxes, cross boxes up on poles, or CC (cellar cabinet) terminals.. some locations are fed by "direct underground" which is where this is the only terminal feeding a location, but most locations are fed by block terminals (F2)/block cable, which feeds an area from the underground terminal to a smaller cable that goes from pole to pole... cross connections are used in the F1 to bridge the underground facilities, and block facilities... from the block terminals, there is usually a drop wire, which can be run from the span to the building, or buried from the terminal to the building... which feeds into either a protector, or network interface device on the side of the building... underground cable usually has bridge taps on some of the pairs, which are called "multies" which brings the same cable/pair from the central office to multiple F1 terminals - this reduces the amount of copper needed to be installed, and provides for additional spares in a terminal for LSTs (line station transfers) if their are no spares in one terminal, but another terminal has spares in it... block (F2) cable normally does not have bridge taps (but occasionally they do) - a block terminal with bridge taps is a pain in the a$$ to work with... because unlike underground cable, where cable/pairs are assigned to a specific telephone number, block pairs are normally chosen by the tech in the field, and there is no assignments for block cable (well on paper there is, but not in practice) so it can be nearly impossible tracking down a cross talk situation when a block cable has multies... edit-- then there is fiber to the curb, where fiber cable is run from the central office to a pole that feeds the customer, these poles are easily identifiable by a large gray box on top of the terminal... these are probably the best thing to be on for voice service (less potential for troubles on the line) BUT can not be used for DSL, T1, etc... - which is why areas fed by fiber to the curb have a copper terminal for special circuits towards the end of the block.. then their is litespan2000 which fiber optic is run from the central office to a CEV (controlled environment vault) which is an air conditioned little room underground... right near the main terminal.. from the CEV the F1 (underground) terminal is fed by copper cable/pairs.. and then goes on to the block cable as normally with copper cable/pairs... i left the RBOC before FTTH (FiOS/Uverse) was implemented in my local area, so i can not provide much assistance in how that stuff is run or terminated...