Phone Systems Tutorial part II by The Jolly Roger Part II will deal with the various types

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Phone Systems Tutorial part II by The Jolly Roger Part II will deal with the various types of operators, office heirarchy, & switching equipment. Operators ~~~~~~~~~ There are many types of operators in the network and the more common ones will be discussed. TSPS Operator: The TSPS [(Traffic Service Position System) ass opposed to This Shitty Phone Service] Operator is probably the bitch (or bastard, for the female libertationists out there) that most of us are used to having to deal with. Here are his/her responsibilities: 1) Obtaning billing information for calling card or third number calls 2) Identifying called customer on person-to-person calls. 3) Obtaining acceptance of charges on collect calls. 4) Identifying calling numbers. This only happens when the calling # is not automatically recorded by CAMA (Centralized Automatic Message Accounting) & forwarded from the local office. This could be caused by equipment failures (ANIF- Automatic Number Identification Failure) or if the office is not equipped for CAMA (ONI- Operator Number Identification). Ask to speak to their supervisor... or better yet the Group Chief (who is the highest ranking official in any office) who is the equivalent of the Madame ina whorehouse. By the way, some CO's that willallow you to dial a 0 or 1 as the 4th digit, will also allow you to call special operators & other fun Tel. Co. #'s without a blue box. This is ver rare, though! For example,212-121-1111 will get you a NY Inward Operator. Office Hierarchy ~~~~~~~~~~~~~~~~ Every switching office in North America (the NPA system), is assigned an office name and class. There are five classes of offices numbered 1 through 5. Your CO is most likely a class 5 or end office. All long-distance (Toll) calls are switched by a toll office which can be a class 4, 3, 2, or 1 office. There is also a class 4X office callen an intermediate point. The 4X office is a digital one that can have an unattended exchange attached to it (known as a Remote Switching Unit (RSU)). The following chart will list the Office #, name, & how many of those office exist (to the best of my knowledge) in North America: Class Name Abb # Existing ----- ----------------------- --- ----------------- > 1 Regional Center RC 12 > 2 Sectional Center SC 67 > 3 Primary Center PC 230 > 4 Toll Center TC 1,300 > 4P Toll Point TP n/a > 4X Intermediate Point IP n/a > 5 End Office EO 19,000 > 6 RSU RSU n/a When connecting a call from one party to another, the switching equipment usually tries to find the shortest route between the class 5 end office of the caller & the class 5 end officeof the called party. If no inter-office trunks exist between the two parties, it will then move upward to the next highest office for servicing calls (Class 4). If the Class 4 office cannot handle the call by sending it to another Class 4 or 5 office, it will then be sent to the next highest office in the hierarchy (3). The switching equipment first uses the high-usage interoffice trunk groups, if they are busy then it goes to the fina; trunk groups on the next highest level. If the call cannot be connected, you will probably get a re-order [120 IPM (interruptions per minute) busy signal] signal. At this time, the guys at Network Operations are probably shitting in their pants and trying to avoid the dreaded Network Dreadlock (as seen on TV!). It is also interesting to note that 9 connections in tandem is called ring-around-the-rosy and it has never occured in telephone history. This would cause an endless loop connection [a neat way to really screw up the network]. The 10 regional centers in the US & the 2 in Canada are all interconnected. they form the foundation of the entire telephone network. Since there are only 12 of them, they are listed below: Class 1 Regional Office Location NPA -------------------------------- --- Dallas 4 ESS 214 Wayne, PA 215 Denver 4T 303 Regina No. 2SP1-4W (Canada) 306 St. Louis 4T 314 Rockdale, GA 404 Pittsburgh 4E 412 Montreal No. 1 4AETS (Canada) 504 That's it for now! More info to come Future update to the Cookbook! Have fun! -Exodus-


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